The previous sync was Linux 4.20. This updates Kconfig to Linux 5.2-rc4.

I adjusted the top Makefile as well because Linux commit 058507195b53
("kbuild: move ".config not found!" message from Kconfig to Makefile")
moved the .config check from Kconfig to Makefile.

I also made auto.conf a mandatory include file, and remove it from the
prerequisites of other targets. We are safe because Make is immediately
terminated when syncconfig fails to generate auto.conf.

Highlights:

 - The parser has no more shift/reduce conflicts

 - The lexer was rewritten more simply

 - The token lookup table was deleted

 - Replace license boilerplates with SPDX

 - Compile C files as separate units

 - Do not overwrite .config when the content was not changed

 - Lots of bug-fixes and cleanups

Signed-off-by: Masahiro Yamada <[email protected]>
---

 Makefile                                      |  40 ++-
 scripts/kconfig/.gitignore                    |   1 +
 scripts/kconfig/Makefile                      |  72 ++---
 scripts/kconfig/conf.c                        |  15 +-
 scripts/kconfig/confdata.c                    | 270 +++++++++-------
 scripts/kconfig/expr.c                        |  18 +-
 scripts/kconfig/expr.h                        |   8 +-
 scripts/kconfig/gconf.c                       |  30 +-
 scripts/kconfig/images.c                      |  34 +-
 scripts/kconfig/images.h                      |  33 ++
 scripts/kconfig/kconf_id.c                    |  52 ----
 scripts/kconfig/{zconf.l => lexer.l}          | 238 +++++++-------
 scripts/kconfig/lkc.h                         |  26 +-
 scripts/kconfig/lxdialog/.gitignore           |   4 -
 scripts/kconfig/lxdialog/BIG.FAT.WARNING      |   2 +-
 scripts/kconfig/lxdialog/checklist.c          |  15 +-
 scripts/kconfig/lxdialog/dialog.h             |  15 +-
 scripts/kconfig/lxdialog/inputbox.c           |  18 +-
 scripts/kconfig/lxdialog/menubox.c            |  15 +-
 scripts/kconfig/lxdialog/textbox.c            |  15 +-
 scripts/kconfig/lxdialog/util.c               |  15 +-
 scripts/kconfig/lxdialog/yesno.c              |  15 +-
 scripts/kconfig/mconf.c                       |   4 +-
 scripts/kconfig/menu.c                        |  43 ++-
 scripts/kconfig/merge_config.sh               |  48 ++-
 scripts/kconfig/nconf-cfg.sh                  |   0
 scripts/kconfig/nconf.c                       |  10 +-
 scripts/kconfig/nconf.gui.c                   |   8 +-
 scripts/kconfig/nconf.h                       |   5 +-
 scripts/kconfig/{zconf.y => parser.y}         | 291 +++++++-----------
 scripts/kconfig/preprocess.c                  |   5 +-
 scripts/kconfig/qconf.cc                      |  46 ++-
 scripts/kconfig/qconf.h                       |   3 +-
 scripts/kconfig/streamline_config.pl          |   2 +-
 scripts/kconfig/symbol.c                      |   7 +-
 scripts/kconfig/tests/auto_submenu/Kconfig    |   2 +
 .../kconfig/tests/auto_submenu/__init__.py    |   1 +
 scripts/kconfig/tests/choice/Kconfig          |   2 +
 scripts/kconfig/tests/choice/__init__.py      |   1 +
 .../tests/choice_value_with_m_dep/Kconfig     |   2 +
 .../tests/choice_value_with_m_dep/__init__.py |   1 +
 .../kconfig/tests/err_recursive_inc/Kconfig   |   1 +
 .../tests/err_recursive_inc/Kconfig.inc1      |   1 +
 .../tests/err_recursive_inc/Kconfig.inc2      |   1 +
 .../tests/err_recursive_inc/Kconfig.inc3      |   1 +
 .../tests/err_recursive_inc/__init__.py       |   1 +
 .../tests/err_recursive_inc/expected_stderr   |   6 +-
 scripts/kconfig/tests/inter_choice/Kconfig    |   2 +
 .../kconfig/tests/inter_choice/__init__.py    |   1 +
 .../kconfig/tests/new_choice_with_dep/Kconfig |   2 +
 .../tests/new_choice_with_dep/__init__.py     |   1 +
 .../tests/no_write_if_dep_unmet/Kconfig       |   2 +
 .../tests/no_write_if_dep_unmet/__init__.py   |   1 +
 .../kconfig/tests/rand_nested_choice/Kconfig  |   2 +
 .../tests/rand_nested_choice/__init__.py      |   1 +
 scripts/kconfig/util.c                        |   3 +-
 56 files changed, 694 insertions(+), 764 deletions(-)
 create mode 100644 scripts/kconfig/images.h
 delete mode 100644 scripts/kconfig/kconf_id.c
 rename scripts/kconfig/{zconf.l => lexer.l} (67%)
 delete mode 100644 scripts/kconfig/lxdialog/.gitignore
 mode change 100644 => 100755 scripts/kconfig/nconf-cfg.sh
 rename scripts/kconfig/{zconf.y => parser.y} (74%)

diff --git a/Makefile b/Makefile
index 1027ceceb..02e21a65f 100644
--- a/Makefile
+++ b/Makefile
@@ -428,31 +428,37 @@ else
 # Carefully list dependencies so we do not try to build scripts twice
 # in parallel
 PHONY += scripts
-scripts: scripts_basic include/config/auto.conf
+scripts: scripts_basic
        $(Q)$(MAKE) $(build)=$(@)
 
 # Objects we will link into barebox / subdirs we need to visit
 common-y               := common/ drivers/ commands/ lib/ crypto/ net/ fs/ 
firmware/
 
 ifeq ($(dot-config),1)
-# Read in config
--include include/config/auto.conf
-
-# Read in dependencies to all Kconfig* files, make sure to run
-# oldconfig if changes are detected.
--include include/config/auto.conf.cmd
-
-# To avoid any implicit rule to kick in, define an empty command
-$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
+include include/config/auto.conf
+
+# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
+# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
+# because some architectures define CROSS_COMPILE there.
+include include/config/auto.conf.cmd
+
+$(KCONFIG_CONFIG):
+       @echo >&2 '***'
+       @echo >&2 '*** Configuration file "$@" not found!'
+       @echo >&2 '***'
+       @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
+       @echo >&2 '*** "make menuconfig" or "make xconfig").'
+       @echo >&2 '***'
+       @/bin/false
 
 # The actual configuration files used during the build are stored in
 # include/generated/ and include/config/. Update them if .config is newer than
 # include/config/auto.conf (which mirrors .config).
-include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
+#
+# This exploits the 'multi-target pattern rule' trick.
+# The syncconfig should be executed only once to make all the targets.
+%/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
        $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
-else
-# Dummy target needed, because used as prerequisite
-include/config/auto.conf: ;
 endif # $(dot-config)
 
 include $(srctree)/arch/$(ARCH)/Makefile
@@ -790,7 +796,7 @@ $(barebox-dirs): prepare scripts
 
 # Store (new) KERNELRELASE string in include/config/kernel.release
 localversion = $(shell $(srctree)/scripts/setlocalversion $(srctree))
-include/config/kernel.release: include/config/auto.conf FORCE
+include/config/kernel.release: FORCE
        $(Q)rm -f $@
        $(Q)echo $(KERNELVERSION)$(localversion) > $@
 
@@ -823,7 +829,7 @@ endif
 prepare2: prepare3 outputmakefile
 
 prepare1: prepare2 include/generated/version.h include/generated/utsrelease.h \
-                   include/config.h include/config/auto.conf
+                   include/config.h
 
 ifneq ($(KBUILD_MODULES),)
        $(Q)mkdir -p $(MODVERDIR)
@@ -854,7 +860,7 @@ define symlink-config-h
        fi
 endef
 
-include/config.h: include/config/auto.conf
+include/config.h:
        $(Q)$(symlink-config-h)
 
 # Generate some files
diff --git a/scripts/kconfig/.gitignore b/scripts/kconfig/.gitignore
index 0aabc1d6a..b5bf92f66 100644
--- a/scripts/kconfig/.gitignore
+++ b/scripts/kconfig/.gitignore
@@ -2,6 +2,7 @@
 # Generated files
 #
 *.moc
+*conf-cfg
 
 #
 # configuration programs
diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile
index 63b609243..3f327e21f 100644
--- a/scripts/kconfig/Makefile
+++ b/scripts/kconfig/Makefile
@@ -76,15 +76,13 @@ savedefconfig: $(obj)/conf
 defconfig: $(obj)/conf
 ifeq ($(KBUILD_DEFCONFIG),)
        $< $(silent) --defconfig $(Kconfig)
-else
-ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)),)
+else ifneq ($(wildcard 
$(srctree)/arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)),)
        @$(kecho) "*** Default configuration is based on '$(KBUILD_DEFCONFIG)'"
        $(Q)$< $(silent) 
--defconfig=arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG) $(Kconfig)
 else
        @$(kecho) "*** Default configuration is based on target 
'$(KBUILD_DEFCONFIG)'"
        $(Q)$(MAKE) -f $(srctree)/Makefile $(KBUILD_DEFCONFIG)
 endif
-endif
 
 %_defconfig: $(obj)/conf
        $(Q)$< $(silent) --defconfig=arch/$(SRCARCH)/configs/$@ $(Kconfig)
@@ -142,75 +140,69 @@ help:
        @echo  '  testconfig      - Run Kconfig unit tests (requires python3 
and pytest)'
 
 # ===========================================================================
-# Shared Makefile for the various kconfig executables:
-# conf:          Used for defconfig, oldconfig and related targets
 # object files used by all kconfig flavours
+common-objs    := confdata.o expr.o lexer.lex.o parser.tab.o preprocess.o \
+                  symbol.o
 
-conf-objs      := conf.o  zconf.tab.o
-
-hostprogs-y := conf
+$(obj)/lexer.lex.o: $(obj)/parser.tab.h
+HOSTCFLAGS_lexer.lex.o := -I $(srctree)/$(src)
+HOSTCFLAGS_parser.tab.o        := -I $(srctree)/$(src)
 
-targets                += zconf.lex.c
-
-# generated files seem to need this to find local include files
-HOSTCFLAGS_zconf.lex.o := -I$(src)
-HOSTCFLAGS_zconf.tab.o := -I$(src)
+# conf: Used for defconfig, oldconfig and related targets
+hostprogs-y    += conf
+conf-objs      := conf.o $(common-objs)
 
 # nconf: Used for the nconfig target based on ncurses
 hostprogs-y    += nconf
-nconf-objs     := nconf.o zconf.tab.o nconf.gui.o
+nconf-objs     := nconf.o nconf.gui.o $(common-objs)
 
-HOSTLDLIBS_nconf       = $(shell . $(obj)/.nconf-cfg && echo $$libs)
-HOSTCFLAGS_nconf.o     = $(shell . $(obj)/.nconf-cfg && echo $$cflags)
-HOSTCFLAGS_nconf.gui.o = $(shell . $(obj)/.nconf-cfg && echo $$cflags)
+HOSTLDLIBS_nconf       = $(shell . $(obj)/nconf-cfg && echo $$libs)
+HOSTCFLAGS_nconf.o     = $(shell . $(obj)/nconf-cfg && echo $$cflags)
+HOSTCFLAGS_nconf.gui.o = $(shell . $(obj)/nconf-cfg && echo $$cflags)
 
-$(obj)/nconf.o $(obj)/nconf.gui.o: $(obj)/.nconf-cfg
+$(obj)/nconf.o $(obj)/nconf.gui.o: $(obj)/nconf-cfg
 
 # mconf: Used for the menuconfig target based on lxdialog
 hostprogs-y    += mconf
 lxdialog       := checklist.o inputbox.o menubox.o textbox.o util.o yesno.o
-mconf-objs     := mconf.o zconf.tab.o $(addprefix lxdialog/, $(lxdialog))
+mconf-objs     := mconf.o $(addprefix lxdialog/, $(lxdialog)) $(common-objs)
 
-HOSTLDLIBS_mconf = $(shell . $(obj)/.mconf-cfg && echo $$libs)
+HOSTLDLIBS_mconf = $(shell . $(obj)/mconf-cfg && echo $$libs)
 $(foreach f, mconf.o $(lxdialog), \
-  $(eval HOSTCFLAGS_$f = $$(shell . $(obj)/.mconf-cfg && echo $$$$cflags)))
+  $(eval HOSTCFLAGS_$f = $$(shell . $(obj)/mconf-cfg && echo $$$$cflags)))
 
-$(obj)/mconf.o: $(obj)/.mconf-cfg
-$(addprefix $(obj)/lxdialog/, $(lxdialog)): $(obj)/.mconf-cfg
+$(obj)/mconf.o: $(obj)/mconf-cfg
+$(addprefix $(obj)/lxdialog/, $(lxdialog)): $(obj)/mconf-cfg
 
 # qconf: Used for the xconfig target based on Qt
 hostprogs-y    += qconf
 qconf-cxxobjs  := qconf.o
-qconf-objs     := zconf.tab.o
+qconf-objs     := images.o $(common-objs)
 
-HOSTLDLIBS_qconf       = $(shell . $(obj)/.qconf-cfg && echo $$libs)
-HOSTCXXFLAGS_qconf.o   = $(shell . $(obj)/.qconf-cfg && echo $$cflags)
+HOSTLDLIBS_qconf       = $(shell . $(obj)/qconf-cfg && echo $$libs)
+HOSTCXXFLAGS_qconf.o   = $(shell . $(obj)/qconf-cfg && echo $$cflags)
 
-$(obj)/qconf.o: $(obj)/.qconf-cfg $(obj)/qconf.moc
+$(obj)/qconf.o: $(obj)/qconf-cfg $(obj)/qconf.moc
 
 quiet_cmd_moc = MOC     $@
-      cmd_moc = $(shell . $(obj)/.qconf-cfg && echo $$moc) -i $< -o $@
+      cmd_moc = $(shell . $(obj)/qconf-cfg && echo $$moc) -i $< -o $@
 
-$(obj)/%.moc: $(src)/%.h $(obj)/.qconf-cfg
+$(obj)/%.moc: $(src)/%.h $(obj)/qconf-cfg
        $(call cmd,moc)
 
 # gconf: Used for the gconfig target based on GTK+
 hostprogs-y    += gconf
-gconf-objs     := gconf.o zconf.tab.o
-
-HOSTLDLIBS_gconf    = $(shell . $(obj)/.gconf-cfg && echo $$libs)
-HOSTCFLAGS_gconf.o  = $(shell . $(obj)/.gconf-cfg && echo $$cflags)
+gconf-objs     := gconf.o images.o $(common-objs)
 
-$(obj)/gconf.o: $(obj)/.gconf-cfg
+HOSTLDLIBS_gconf    = $(shell . $(obj)/gconf-cfg && echo $$libs)
+HOSTCFLAGS_gconf.o  = $(shell . $(obj)/gconf-cfg && echo $$cflags)
 
-$(obj)/zconf.tab.o: $(obj)/zconf.lex.c
+$(obj)/gconf.o: $(obj)/gconf-cfg
 
 # check if necessary packages are available, and configure build flags
-define filechk_conf_cfg
-       $(CONFIG_SHELL) $<
-endef
+filechk_conf_cfg = $(CONFIG_SHELL) $<
 
-$(obj)/.%conf-cfg: $(src)/%conf-cfg.sh FORCE
+$(obj)/%conf-cfg: $(src)/%conf-cfg.sh FORCE
        $(call filechk,conf_cfg)
 
-clean-files += .*conf-cfg
+clean-files += *conf-cfg
diff --git a/scripts/kconfig/conf.c b/scripts/kconfig/conf.c
index 98e0c7a34..ef3678c24 100644
--- a/scripts/kconfig/conf.c
+++ b/scripts/kconfig/conf.c
@@ -1,6 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2002 Roman Zippel <[email protected]>
- * Released under the terms of the GNU GPL v2.0.
  */
 
 #include <ctype.h>
@@ -488,7 +488,6 @@ int main(int ac, char **av)
        const char *progname = av[0];
        int opt;
        const char *name, *defconfig_file = NULL /* gcc uninit */;
-       struct stat tmpstat;
        int no_conf_write = 0;
 
        tty_stdio = isatty(0) && isatty(1);
@@ -560,18 +559,6 @@ int main(int ac, char **av)
        name = av[optind];
        conf_parse(name);
        //zconfdump(stdout);
-       if (sync_kconfig) {
-               name = conf_get_configname();
-               if (stat(name, &tmpstat)) {
-                       fprintf(stderr, "***\n"
-                               "*** Configuration file \"%s\" not found!\n"
-                               "***\n"
-                               "*** Please run some configurator (e.g. \"make 
oldconfig\" or\n"
-                               "*** \"make menuconfig\" or \"make 
xconfig\").\n"
-                               "***\n", name);
-                       exit(1);
-               }
-       }
 
        switch (input_mode) {
        case defconfig:
diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
index 91d0a5c01..6006154d3 100644
--- a/scripts/kconfig/confdata.c
+++ b/scripts/kconfig/confdata.c
@@ -1,12 +1,14 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2002 Roman Zippel <[email protected]>
- * Released under the terms of the GNU GPL v2.0.
  */
 
+#include <sys/mman.h>
 #include <sys/stat.h>
 #include <ctype.h>
 #include <errno.h>
 #include <fcntl.h>
+#include <limits.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -35,6 +37,52 @@ static bool is_dir(const char *path)
        return S_ISDIR(st.st_mode);
 }
 
+/* return true if the given two files are the same, false otherwise */
+static bool is_same(const char *file1, const char *file2)
+{
+       int fd1, fd2;
+       struct stat st1, st2;
+       void *map1, *map2;
+       bool ret = false;
+
+       fd1 = open(file1, O_RDONLY);
+       if (fd1 < 0)
+               return ret;
+
+       fd2 = open(file2, O_RDONLY);
+       if (fd2 < 0)
+               goto close1;
+
+       ret = fstat(fd1, &st1);
+       if (ret)
+               goto close2;
+       ret = fstat(fd2, &st2);
+       if (ret)
+               goto close2;
+
+       if (st1.st_size != st2.st_size)
+               goto close2;
+
+       map1 = mmap(NULL, st1.st_size, PROT_READ, MAP_PRIVATE, fd1, 0);
+       if (map1 == MAP_FAILED)
+               goto close2;
+
+       map2 = mmap(NULL, st2.st_size, PROT_READ, MAP_PRIVATE, fd2, 0);
+       if (map2 == MAP_FAILED)
+               goto close2;
+
+       if (bcmp(map1, map2, st1.st_size))
+               goto close2;
+
+       ret = true;
+close2:
+       close(fd2);
+close1:
+       close(fd1);
+
+       return ret;
+}
+
 /*
  * Create the parent directory of the given path.
  *
@@ -74,6 +122,47 @@ static int make_parent_dir(const char *path)
        return 0;
 }
 
+static char depfile_path[PATH_MAX];
+static size_t depfile_prefix_len;
+
+/* touch depfile for symbol 'name' */
+static int conf_touch_dep(const char *name)
+{
+       int fd, ret;
+       const char *s;
+       char *d, c;
+
+       /* check overflow: prefix + name + ".h" + '\0' must fit in buffer. */
+       if (depfile_prefix_len + strlen(name) + 3 > sizeof(depfile_path))
+               return -1;
+
+       d = depfile_path + depfile_prefix_len;
+       s = name;
+
+       while ((c = *s++))
+               *d++ = (c == '_') ? '/' : tolower(c);
+       strcpy(d, ".h");
+
+       /* Assume directory path already exists. */
+       fd = open(depfile_path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
+       if (fd == -1) {
+               if (errno != ENOENT)
+                       return -1;
+
+               ret = make_parent_dir(depfile_path);
+               if (ret)
+                       return ret;
+
+               /* Try it again. */
+               fd = open(depfile_path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
+               if (fd == -1)
+                       return -1;
+       }
+       close(fd);
+
+       return 0;
+}
+
 struct conf_printer {
        void (*print_symbol)(FILE *, struct symbol *, const char *, void *);
        void (*print_comment)(FILE *, const char *, void *);
@@ -137,7 +226,7 @@ const char *conf_get_configname(void)
        return name ? name : ".config";
 }
 
-const char *conf_get_autoconfig_name(void)
+static const char *conf_get_autoconfig_name(void)
 {
        char *name = getenv("KCONFIG_AUTOCONFIG");
 
@@ -152,7 +241,7 @@ char *conf_get_default_confname(void)
        name = expand_string(conf_defname);
        env = getenv(SRCTREE);
        if (env) {
-               sprintf(fullname, "%s/%s", env, name);
+               snprintf(fullname, sizeof(fullname), "%s/%s", env, name);
                if (is_present(fullname))
                        return fullname;
        }
@@ -186,14 +275,6 @@ static int conf_set_sym_val(struct symbol *sym, int def, 
int def_flags, char *p)
                        conf_warning("symbol value '%s' invalid for %s",
                                     p, sym->name);
                return 1;
-       case S_OTHER:
-               if (*p != '"') {
-                       for (p2 = p; *p2 && !isspace(*p2); p2++)
-                               ;
-                       sym->type = S_STRING;
-                       goto done;
-               }
-               /* fall through */
        case S_STRING:
                if (*p++ != '"')
                        break;
@@ -212,7 +293,6 @@ static int conf_set_sym_val(struct symbol *sym, int def, 
int def_flags, char *p)
                /* fall through */
        case S_INT:
        case S_HEX:
-       done:
                if (sym_string_valid(sym, p)) {
                        sym->def[def].val = xstrdup(p);
                        sym->flags |= def_flags;
@@ -363,7 +443,7 @@ load:
                                sym = sym_find(line + 2 + strlen(CONFIG_));
                                if (!sym) {
                                        sym_add_change_count(1);
-                                       goto setsym;
+                                       continue;
                                }
                        } else {
                                sym = sym_lookup(line + 2 + strlen(CONFIG_), 0);
@@ -393,17 +473,22 @@ load:
                                if (*p2 == '\r')
                                        *p2 = 0;
                        }
-                       if (def == S_DEF_USER) {
-                               sym = sym_find(line + strlen(CONFIG_));
-                               if (!sym) {
+
+                       sym = sym_find(line + strlen(CONFIG_));
+                       if (!sym) {
+                               if (def == S_DEF_AUTO)
+                                       /*
+                                        * Reading from include/config/auto.conf
+                                        * If CONFIG_FOO previously existed in
+                                        * auto.conf but it is missing now,
+                                        * include/config/foo.h must be touched.
+                                        */
+                                       conf_touch_dep(line + strlen(CONFIG_));
+                               else
                                        sym_add_change_count(1);
-                                       goto setsym;
-                               }
-                       } else {
-                               sym = sym_lookup(line + strlen(CONFIG_), 0);
-                               if (sym->type == S_UNKNOWN)
-                                       sym->type = S_OTHER;
+                               continue;
                        }
+
                        if (sym->flags & def_flags) {
                                conf_warning("override: reassigning to symbol 
%s", sym->name);
                        }
@@ -416,7 +501,7 @@ load:
 
                        continue;
                }
-setsym:
+
                if (sym && sym_is_choice_value(sym)) {
                        struct symbol *cs = 
prop_get_symbol(sym_get_choice_prop(sym));
                        switch (sym->def[def].tri) {
@@ -669,7 +754,6 @@ static void conf_write_symbol(FILE *fp, struct symbol *sym,
        const char *str;
 
        switch (sym->type) {
-       case S_OTHER:
        case S_UNKNOWN:
                break;
        case S_STRING:
@@ -780,40 +864,35 @@ int conf_write(const char *name)
        FILE *out;
        struct symbol *sym;
        struct menu *menu;
-       const char *basename;
        const char *str;
-       char dirname[PATH_MAX+1], tmpname[PATH_MAX+22], newname[PATH_MAX+8];
+       char tmpname[PATH_MAX + 1], oldname[PATH_MAX + 1];
        char *env;
+       bool need_newline = false;
+
+       if (!name)
+               name = conf_get_configname();
+
+       if (!*name) {
+               fprintf(stderr, "config name is empty\n");
+               return -1;
+       }
+
+       if (is_dir(name)) {
+               fprintf(stderr, "%s: Is a directory\n", name);
+               return -1;
+       }
+
+       if (make_parent_dir(name))
+               return -1;
 
-       dirname[0] = 0;
-       if (name && name[0]) {
-               char *slash;
-
-               if (is_dir(name)) {
-                       strcpy(dirname, name);
-                       strcat(dirname, "/");
-                       basename = conf_get_configname();
-               } else if ((slash = strrchr(name, '/'))) {
-                       int size = slash - name + 1;
-                       memcpy(dirname, name, size);
-                       dirname[size] = 0;
-                       if (slash[1])
-                               basename = slash + 1;
-                       else
-                               basename = conf_get_configname();
-               } else
-                       basename = name;
-       } else
-               basename = conf_get_configname();
-
-       sprintf(newname, "%s%s", dirname, basename);
        env = getenv("KCONFIG_OVERWRITECONFIG");
-       if (!env || !*env) {
-               sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
-               out = fopen(tmpname, "w");
-       } else {
+       if (env && *env) {
                *tmpname = 0;
-               out = fopen(newname, "w");
+               out = fopen(name, "w");
+       } else {
+               snprintf(tmpname, sizeof(tmpname), "%s.%d.tmp",
+                        name, (int)getpid());
+               out = fopen(tmpname, "w");
        }
        if (!out)
                return 1;
@@ -834,12 +913,16 @@ int conf_write(const char *name)
                                     "#\n"
                                     "# %s\n"
                                     "#\n", str);
+                       need_newline = false;
                } else if (!(sym->flags & SYMBOL_CHOICE)) {
                        sym_calc_value(sym);
                        if (!(sym->flags & SYMBOL_WRITE))
                                goto next;
+                       if (need_newline) {
+                               fprintf(out, "\n");
+                               need_newline = false;
+                       }
                        sym->flags &= ~SYMBOL_WRITE;
-
                        conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
                }
 
@@ -851,6 +934,12 @@ next:
                if (menu->next)
                        menu = menu->next;
                else while ((menu = menu->parent)) {
+                       if (!menu->sym && menu_is_visible(menu) &&
+                           menu != &rootmenu) {
+                               str = menu_get_prompt(menu);
+                               fprintf(out, "# end of %s\n", str);
+                               need_newline = true;
+                       }
                        if (menu->next) {
                                menu = menu->next;
                                break;
@@ -860,14 +949,20 @@ next:
        fclose(out);
 
        if (*tmpname) {
-               strcat(dirname, basename);
-               strcat(dirname, ".old");
-               rename(newname, dirname);
-               if (rename(tmpname, newname))
+               if (is_same(name, tmpname)) {
+                       conf_message("No change to %s", name);
+                       unlink(tmpname);
+                       sym_set_change_count(0);
+                       return 0;
+               }
+
+               snprintf(oldname, sizeof(oldname), "%s.old", name);
+               rename(name, oldname);
+               if (rename(tmpname, name))
                        return 1;
        }
 
-       conf_message("configuration written to %s", newname);
+       conf_message("configuration written to %s", name);
 
        sym_set_change_count(0);
 
@@ -880,8 +975,6 @@ static int conf_write_dep(const char *name)
        struct file *file;
        FILE *out;
 
-       if (!name)
-               name = ".kconfig.d";
        out = fopen("..config.tmp", "w");
        if (!out)
                return 1;
@@ -906,24 +999,19 @@ static int conf_write_dep(const char *name)
        return 0;
 }
 
-static int conf_split_config(void)
+static int conf_touch_deps(void)
 {
        const char *name;
-       char path[PATH_MAX+1];
-       char *s, *d, c;
        struct symbol *sym;
-       int res, i, fd;
+       int res, i;
+
+       strcpy(depfile_path, "include/config/");
+       depfile_prefix_len = strlen(depfile_path);
 
        name = conf_get_autoconfig_name();
        conf_read_simple(name, S_DEF_AUTO);
        sym_calc_value(modules_sym);
 
-       if (make_parent_dir("include/config/foo.h"))
-               return 1;
-       if (chdir("include/config"))
-               return 1;
-
-       res = 0;
        for_all_symbols(i, sym) {
                sym_calc_value(sym);
                if ((sym->flags & SYMBOL_NO_WRITE) || !sym->name)
@@ -975,42 +1063,12 @@ static int conf_split_config(void)
                 *      different from 'no').
                 */
 
-               /* Replace all '_' and append ".h" */
-               s = sym->name;
-               d = path;
-               while ((c = *s++)) {
-                       c = tolower(c);
-                       *d++ = (c == '_') ? '/' : c;
-               }
-               strcpy(d, ".h");
-
-               /* Assume directory path already exists. */
-               fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
-               if (fd == -1) {
-                       if (errno != ENOENT) {
-                               res = 1;
-                               break;
-                       }
-
-                       if (make_parent_dir(path)) {
-                               res = 1;
-                               goto out;
-                       }
-
-                       /* Try it again. */
-                       fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
-                       if (fd == -1) {
-                               res = 1;
-                               break;
-                       }
-               }
-               close(fd);
+               res = conf_touch_dep(sym->name);
+               if (res)
+                       return res;
        }
-out:
-       if (chdir("../.."))
-               return 1;
 
-       return res;
+       return 0;
 }
 
 int conf_write_autoconf(int overwrite)
@@ -1028,7 +1086,7 @@ int conf_write_autoconf(int overwrite)
 
        conf_write_dep("include/config/auto.conf.cmd");
 
-       if (conf_split_config())
+       if (conf_touch_deps())
                return 1;
 
        out = fopen(".tmpconfig", "w");
diff --git a/scripts/kconfig/expr.c b/scripts/kconfig/expr.c
index e1a39e908..77ffff3a0 100644
--- a/scripts/kconfig/expr.c
+++ b/scripts/kconfig/expr.c
@@ -1,8 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2002 Roman Zippel <[email protected]>
- * Released under the terms of the GNU GPL v2.0.
  */
 
+#include <ctype.h>
+#include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -980,7 +982,6 @@ enum string_value_kind {
        k_string,
        k_signed,
        k_unsigned,
-       k_invalid
 };
 
 union string_value {
@@ -1011,13 +1012,10 @@ static enum string_value_kind expr_parse_string(const 
char *str,
                val->u = strtoull(str, &tail, 16);
                kind = k_unsigned;
                break;
-       case S_STRING:
-       case S_UNKNOWN:
+       default:
                val->s = strtoll(str, &tail, 0);
                kind = k_signed;
                break;
-       default:
-               return k_invalid;
        }
        return !errno && !*tail && tail > str && isxdigit(tail[-1])
               ? kind : k_string;
@@ -1073,13 +1071,7 @@ tristate expr_calc_value(struct expr *e)
 
        if (k1 == k_string || k2 == k_string)
                res = strcmp(str1, str2);
-       else if (k1 == k_invalid || k2 == k_invalid) {
-               if (e->type != E_EQUAL && e->type != E_UNEQUAL) {
-                       printf("Cannot compare \"%s\" and \"%s\"\n", str1, 
str2);
-                       return no;
-               }
-               res = strcmp(str1, str2);
-       } else if (k1 == k_unsigned || k2 == k_unsigned)
+       else if (k1 == k_unsigned || k2 == k_unsigned)
                res = (lval.u > rval.u) - (lval.u < rval.u);
        else /* if (k1 == k_signed && k2 == k_signed) */
                res = (lval.s > rval.s) - (lval.s < rval.s);
diff --git a/scripts/kconfig/expr.h b/scripts/kconfig/expr.h
index 7c329e179..8dde65bc3 100644
--- a/scripts/kconfig/expr.h
+++ b/scripts/kconfig/expr.h
@@ -1,6 +1,6 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Copyright (C) 2002 Roman Zippel <[email protected]>
- * Released under the terms of the GNU GPL v2.0.
  */
 
 #ifndef EXPR_H
@@ -62,7 +62,7 @@ struct symbol_value {
 };
 
 enum symbol_type {
-       S_UNKNOWN, S_BOOLEAN, S_TRISTATE, S_INT, S_HEX, S_STRING, S_OTHER
+       S_UNKNOWN, S_BOOLEAN, S_TRISTATE, S_INT, S_HEX, S_STRING
 };
 
 /* enum values are used as index to symbol.def[] */
@@ -131,7 +131,7 @@ struct symbol {
        struct expr_value implied;
 };
 
-#define for_all_symbols(i, sym) for (i = 0; i < SYMBOL_HASHSIZE; i++) for (sym 
= symbol_hash[i]; sym; sym = sym->next) if (sym->type != S_OTHER)
+#define for_all_symbols(i, sym) for (i = 0; i < SYMBOL_HASHSIZE; i++) for (sym 
= symbol_hash[i]; sym; sym = sym->next)
 
 #define SYMBOL_CONST      0x0001  /* symbol is const */
 #define SYMBOL_CHECK      0x0008  /* used during dependency checking */
@@ -172,7 +172,7 @@ struct symbol {
  *         int "BAZ Value"
  *         range 1..255
  *
- * Please, also check zconf.y:print_symbol() when modifying the
+ * Please, also check parser.y:print_symbol() when modifying the
  * list of property types!
  */
 enum prop_type {
diff --git a/scripts/kconfig/gconf.c b/scripts/kconfig/gconf.c
index 0ac700bf1..e36b342f1 100644
--- a/scripts/kconfig/gconf.c
+++ b/scripts/kconfig/gconf.c
@@ -1,9 +1,6 @@
-/* Hey EMACS -*- linux-c -*- */
+// SPDX-License-Identifier: GPL-2.0
 /*
- *
  * Copyright (C) 2002-2003 Romain Lievin <[email protected]>
- * Released under the terms of the GNU GPL v2.0.
- *
  */
 
 #ifdef HAVE_CONFIG_H
@@ -12,7 +9,7 @@
 
 #include <stdlib.h>
 #include "lkc.h"
-#include "images.c"
+#include "images.h"
 
 #include <glade/glade.h>
 #include <gtk/gtk.h>
@@ -78,8 +75,8 @@ static gchar **fill_row(struct menu *menu);
 static void conf_changed(void);
 
 /* Helping/Debugging Functions */
-
-const char *dbg_sym_flags(int val)
+#ifdef DEBUG
+static const char *dbg_sym_flags(int val)
 {
        static char buf[256];
 
@@ -108,9 +105,10 @@ const char *dbg_sym_flags(int val)
 
        return buf;
 }
+#endif
 
-void replace_button_icon(GladeXML * xml, GdkDrawable * window,
-                        GtkStyle * style, gchar * btn_name, gchar ** xpm)
+static void replace_button_icon(GladeXML *xml, GdkDrawable *window,
+                               GtkStyle *style, gchar *btn_name, gchar **xpm)
 {
        GdkPixmap *pixmap;
        GdkBitmap *mask;
@@ -128,7 +126,7 @@ void replace_button_icon(GladeXML * xml, GdkDrawable * 
window,
 }
 
 /* Main Window Initialization */
-void init_main_window(const gchar * glade_file)
+static void init_main_window(const gchar *glade_file)
 {
        GladeXML *xml;
        GtkWidget *widget;
@@ -190,7 +188,7 @@ void init_main_window(const gchar * glade_file)
        gtk_widget_show(main_wnd);
 }
 
-void init_tree_model(void)
+static void init_tree_model(void)
 {
        gint i;
 
@@ -220,7 +218,7 @@ void init_tree_model(void)
        model1 = GTK_TREE_MODEL(tree1);
 }
 
-void init_left_tree(void)
+static void init_left_tree(void)
 {
        GtkTreeView *view = GTK_TREE_VIEW(tree1_w);
        GtkCellRenderer *renderer;
@@ -262,7 +260,7 @@ static void renderer_edited(GtkCellRendererText * cell,
                            const gchar * path_string,
                            const gchar * new_text, gpointer user_data);
 
-void init_right_tree(void)
+static void init_right_tree(void)
 {
        GtkTreeView *view = GTK_TREE_VIEW(tree2_w);
        GtkCellRenderer *renderer;
@@ -1212,8 +1210,8 @@ static GtkTreeIter found;
 /*
  * Find a menu in the GtkTree starting at parent.
  */
-GtkTreeIter *gtktree_iter_find_node(GtkTreeIter * parent,
-                                   struct menu *tofind)
+static GtkTreeIter *gtktree_iter_find_node(GtkTreeIter *parent,
+                                          struct menu *tofind)
 {
        GtkTreeIter iter;
        GtkTreeIter *child = &iter;
@@ -1424,7 +1422,7 @@ static void display_list(void)
        tree = tree2;
 }
 
-void fixup_rootmenu(struct menu *menu)
+static void fixup_rootmenu(struct menu *menu)
 {
        struct menu *child;
        static int menu_cnt = 0;
diff --git a/scripts/kconfig/images.c b/scripts/kconfig/images.c
index d4f84bd4a..b4fa0e4a6 100644
--- a/scripts/kconfig/images.c
+++ b/scripts/kconfig/images.c
@@ -1,9 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2002 Roman Zippel <[email protected]>
- * Released under the terms of the GNU GPL v2.0.
  */
 
-static const char *xpm_load[] = {
+#include "images.h"
+
+const char *xpm_load[] = {
 "22 22 5 1",
 ". c None",
 "# c #000000",
@@ -33,7 +35,7 @@ static const char *xpm_load[] = {
 "###############.......",
 "......................"};
 
-static const char *xpm_save[] = {
+const char *xpm_save[] = {
 "22 22 5 1",
 ". c None",
 "# c #000000",
@@ -63,7 +65,7 @@ static const char *xpm_save[] = {
 "..##################..",
 "......................"};
 
-static const char *xpm_back[] = {
+const char *xpm_back[] = {
 "22 22 3 1",
 ". c None",
 "# c #000083",
@@ -91,7 +93,7 @@ static const char *xpm_back[] = {
 "......................",
 "......................"};
 
-static const char *xpm_tree_view[] = {
+const char *xpm_tree_view[] = {
 "22 22 2 1",
 ". c None",
 "# c #000000",
@@ -118,7 +120,7 @@ static const char *xpm_tree_view[] = {
 "......................",
 "......................"};
 
-static const char *xpm_single_view[] = {
+const char *xpm_single_view[] = {
 "22 22 2 1",
 ". c None",
 "# c #000000",
@@ -145,7 +147,7 @@ static const char *xpm_single_view[] = {
 "......................",
 "......................"};
 
-static const char *xpm_split_view[] = {
+const char *xpm_split_view[] = {
 "22 22 2 1",
 ". c None",
 "# c #000000",
@@ -172,7 +174,7 @@ static const char *xpm_split_view[] = {
 "......................",
 "......................"};
 
-static const char *xpm_symbol_no[] = {
+const char *xpm_symbol_no[] = {
 "12 12 2 1",
 "  c white",
 ". c black",
@@ -189,7 +191,7 @@ static const char *xpm_symbol_no[] = {
 " .......... ",
 "            "};
 
-static const char *xpm_symbol_mod[] = {
+const char *xpm_symbol_mod[] = {
 "12 12 2 1",
 "  c white",
 ". c black",
@@ -206,7 +208,7 @@ static const char *xpm_symbol_mod[] = {
 " .......... ",
 "            "};
 
-static const char *xpm_symbol_yes[] = {
+const char *xpm_symbol_yes[] = {
 "12 12 2 1",
 "  c white",
 ". c black",
@@ -223,7 +225,7 @@ static const char *xpm_symbol_yes[] = {
 " .......... ",
 "            "};
 
-static const char *xpm_choice_no[] = {
+const char *xpm_choice_no[] = {
 "12 12 2 1",
 "  c white",
 ". c black",
@@ -240,7 +242,7 @@ static const char *xpm_choice_no[] = {
 "    ....    ",
 "            "};
 
-static const char *xpm_choice_yes[] = {
+const char *xpm_choice_yes[] = {
 "12 12 2 1",
 "  c white",
 ". c black",
@@ -257,7 +259,7 @@ static const char *xpm_choice_yes[] = {
 "    ....    ",
 "            "};
 
-static const char *xpm_menu[] = {
+const char *xpm_menu[] = {
 "12 12 2 1",
 "  c white",
 ". c black",
@@ -274,7 +276,7 @@ static const char *xpm_menu[] = {
 " .......... ",
 "            "};
 
-static const char *xpm_menu_inv[] = {
+const char *xpm_menu_inv[] = {
 "12 12 2 1",
 "  c white",
 ". c black",
@@ -291,7 +293,7 @@ static const char *xpm_menu_inv[] = {
 " .......... ",
 "            "};
 
-static const char *xpm_menuback[] = {
+const char *xpm_menuback[] = {
 "12 12 2 1",
 "  c white",
 ". c black",
@@ -308,7 +310,7 @@ static const char *xpm_menuback[] = {
 " .......... ",
 "            "};
 
-static const char *xpm_void[] = {
+const char *xpm_void[] = {
 "12 12 2 1",
 "  c white",
 ". c black",
diff --git a/scripts/kconfig/images.h b/scripts/kconfig/images.h
new file mode 100644
index 000000000..d8ff614bd
--- /dev/null
+++ b/scripts/kconfig/images.h
@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2002 Roman Zippel <[email protected]>
+ */
+
+#ifndef IMAGES_H
+#define IMAGES_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern const char *xpm_load[];
+extern const char *xpm_save[];
+extern const char *xpm_back[];
+extern const char *xpm_tree_view[];
+extern const char *xpm_single_view[];
+extern const char *xpm_split_view[];
+extern const char *xpm_symbol_no[];
+extern const char *xpm_symbol_mod[];
+extern const char *xpm_symbol_yes[];
+extern const char *xpm_choice_no[];
+extern const char *xpm_choice_yes[];
+extern const char *xpm_menu[];
+extern const char *xpm_menu_inv[];
+extern const char *xpm_menuback[];
+extern const char *xpm_void[];
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* IMAGES_H */
diff --git a/scripts/kconfig/kconf_id.c b/scripts/kconfig/kconf_id.c
deleted file mode 100644
index b3e0ea0ac..000000000
--- a/scripts/kconfig/kconf_id.c
+++ /dev/null
@@ -1,52 +0,0 @@
-
-static struct kconf_id kconf_id_array[] = {
-       { "mainmenu",           T_MAINMENU,             TF_COMMAND },
-       { "menu",               T_MENU,                 TF_COMMAND },
-       { "endmenu",            T_ENDMENU,              TF_COMMAND },
-       { "source",             T_SOURCE,               TF_COMMAND },
-       { "choice",             T_CHOICE,               TF_COMMAND },
-       { "endchoice",          T_ENDCHOICE,            TF_COMMAND },
-       { "comment",            T_COMMENT,              TF_COMMAND },
-       { "config",             T_CONFIG,               TF_COMMAND },
-       { "menuconfig",         T_MENUCONFIG,           TF_COMMAND },
-       { "help",               T_HELP,                 TF_COMMAND },
-       { "---help---",         T_HELP,                 TF_COMMAND },
-       { "if",                 T_IF,                   TF_COMMAND|TF_PARAM },
-       { "endif",              T_ENDIF,                TF_COMMAND },
-       { "depends",            T_DEPENDS,              TF_COMMAND },
-       { "optional",           T_OPTIONAL,             TF_COMMAND },
-       { "default",            T_DEFAULT,              TF_COMMAND, S_UNKNOWN },
-       { "prompt",             T_PROMPT,               TF_COMMAND },
-       { "tristate",           T_TYPE,                 TF_COMMAND, S_TRISTATE 
},
-       { "def_tristate",       T_DEFAULT,              TF_COMMAND, S_TRISTATE 
},
-       { "bool",               T_TYPE,                 TF_COMMAND, S_BOOLEAN },
-       { "def_bool",           T_DEFAULT,              TF_COMMAND, S_BOOLEAN },
-       { "int",                T_TYPE,                 TF_COMMAND, S_INT },
-       { "hex",                T_TYPE,                 TF_COMMAND, S_HEX },
-       { "string",             T_TYPE,                 TF_COMMAND, S_STRING },
-       { "select",             T_SELECT,               TF_COMMAND },
-       { "imply",              T_IMPLY,                TF_COMMAND },
-       { "range",              T_RANGE,                TF_COMMAND },
-       { "visible",            T_VISIBLE,              TF_COMMAND },
-       { "option",             T_OPTION,               TF_COMMAND },
-       { "on",                 T_ON,                   TF_PARAM },
-       { "modules",            T_OPT_MODULES,          TF_OPTION },
-       { "defconfig_list",     T_OPT_DEFCONFIG_LIST,   TF_OPTION },
-       { "allnoconfig_y",      T_OPT_ALLNOCONFIG_Y,    TF_OPTION },
-};
-
-#define KCONF_ID_ARRAY_SIZE (sizeof(kconf_id_array)/sizeof(struct kconf_id))
-
-static const struct kconf_id *kconf_id_lookup(register const char *str, 
register unsigned int len)
-{
-       int i;
-
-       for (i = 0; i < KCONF_ID_ARRAY_SIZE; i++) {
-               struct kconf_id *id = kconf_id_array+i;
-               int l = strlen(id->name);
-
-               if (len == l && !memcmp(str, id->name, len))
-                       return id;
-       }
-       return NULL;
-}
diff --git a/scripts/kconfig/zconf.l b/scripts/kconfig/lexer.l
similarity index 67%
rename from scripts/kconfig/zconf.l
rename to scripts/kconfig/lexer.l
index 25bd2b89f..6354c905b 100644
--- a/scripts/kconfig/zconf.l
+++ b/scripts/kconfig/lexer.l
@@ -1,11 +1,11 @@
-%option nostdinit noyywrap never-interactive full ecs
-%option 8bit nodefault yylineno
-%x COMMAND HELP STRING PARAM ASSIGN_VAL
-%{
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Copyright (C) 2002 Roman Zippel <[email protected]>
- * Released under the terms of the GNU GPL v2.0.
  */
+%option nostdinit noyywrap never-interactive full ecs
+%option 8bit nodefault yylineno
+%x ASSIGN_VAL HELP STRING
+%{
 
 #include <assert.h>
 #include <limits.h>
@@ -15,6 +15,9 @@
 #include <unistd.h>
 
 #include "lkc.h"
+#include "parser.tab.h"
+
+#define YY_DECL                static int yylex1(void)
 
 #define START_STRSIZE  16
 
@@ -23,6 +26,8 @@ static struct {
        int lineno;
 } current_pos;
 
+static int prev_prev_token = T_EOL;
+static int prev_token = T_EOL;
 static char *text;
 static int text_size, text_asize;
 
@@ -73,7 +78,7 @@ static void warn_ignored_character(char chr)
 {
        fprintf(stderr,
                "%s:%d:warning: ignoring unsupported character '%c'\n",
-               zconf_curname(), zconf_lineno(), chr);
+               current_file->name, yylineno, chr);
 }
 %}
 
@@ -83,54 +88,73 @@ n   [A-Za-z0-9_-]
        int str = 0;
        int ts, i;
 
-[ \t]*#.*\n    |
-[ \t]*\n       {
-       return T_EOL;
-}
-[ \t]*#.*
-
-
-[ \t]+ {
-       BEGIN(COMMAND);
-}
-
-.      {
-       unput(yytext[0]);
-       BEGIN(COMMAND);
-}
-
-
-<COMMAND>{
-       {n}+    {
-               const struct kconf_id *id = kconf_id_lookup(yytext, yyleng);
-               current_pos.file = current_file;
-               current_pos.lineno = yylineno;
-               if (id && id->flags & TF_COMMAND) {
-                       BEGIN(PARAM);
-                       yylval.id = id;
-                       return id->token;
-               }
-               alloc_string(yytext, yyleng);
-               yylval.string = text;
-               return T_VARIABLE;
-       }
-       ({n}|$)+        {
-               /* this token includes at least one '$' */
-               yylval.string = expand_token(yytext, yyleng);
-               if (strlen(yylval.string))
-                       return T_VARIABLE;
-               free(yylval.string);
-       }
-       "="     { BEGIN(ASSIGN_VAL); yylval.flavor = VAR_RECURSIVE; return 
T_ASSIGN; }
-       ":="    { BEGIN(ASSIGN_VAL); yylval.flavor = VAR_SIMPLE; return 
T_ASSIGN; }
-       "+="    { BEGIN(ASSIGN_VAL); yylval.flavor = VAR_APPEND; return 
T_ASSIGN; }
-       [[:blank:]]+
-       .       warn_ignored_character(*yytext);
-       \n      {
-               BEGIN(INITIAL);
-               return T_EOL;
-       }
-}
+#.*                    /* ignore comment */
+[ \t]*                 /* whitespaces */
+\\\n                   /* escaped new line */
+\n                     return T_EOL;
+"allnoconfig_y"                return T_ALLNOCONFIG_Y;
+"bool"                 return T_BOOL;
+"choice"               return T_CHOICE;
+"comment"              return T_COMMENT;
+"config"               return T_CONFIG;
+"def_bool"             return T_DEF_BOOL;
+"def_tristate"         return T_DEF_TRISTATE;
+"default"              return T_DEFAULT;
+"defconfig_list"       return T_DEFCONFIG_LIST;
+"depends"              return T_DEPENDS;
+"endchoice"            return T_ENDCHOICE;
+"endif"                        return T_ENDIF;
+"endmenu"              return T_ENDMENU;
+"help"|"---help---"    return T_HELP;
+"hex"                  return T_HEX;
+"if"                   return T_IF;
+"imply"                        return T_IMPLY;
+"int"                  return T_INT;
+"mainmenu"             return T_MAINMENU;
+"menu"                 return T_MENU;
+"menuconfig"           return T_MENUCONFIG;
+"modules"              return T_MODULES;
+"on"                   return T_ON;
+"option"               return T_OPTION;
+"optional"             return T_OPTIONAL;
+"prompt"               return T_PROMPT;
+"range"                        return T_RANGE;
+"select"               return T_SELECT;
+"source"               return T_SOURCE;
+"string"               return T_STRING;
+"tristate"             return T_TRISTATE;
+"visible"              return T_VISIBLE;
+"||"                   return T_OR;
+"&&"                   return T_AND;
+"="                    return T_EQUAL;
+"!="                   return T_UNEQUAL;
+"<"                    return T_LESS;
+"<="                   return T_LESS_EQUAL;
+">"                    return T_GREATER;
+">="                   return T_GREATER_EQUAL;
+"!"                    return T_NOT;
+"("                    return T_OPEN_PAREN;
+")"                    return T_CLOSE_PAREN;
+":="                   return T_COLON_EQUAL;
+"+="                   return T_PLUS_EQUAL;
+\"|\'                  {
+                               str = yytext[0];
+                               new_string();
+                               BEGIN(STRING);
+                       }
+{n}+                   {
+                               alloc_string(yytext, yyleng);
+                               yylval.string = text;
+                               return T_WORD;
+                       }
+({n}|$)+               {
+                               /* this token includes at least one '$' */
+                               yylval.string = expand_token(yytext, yyleng);
+                               if (strlen(yylval.string))
+                                       return T_WORD;
+                               free(yylval.string);
+                       }
+.                      warn_ignored_character(*yytext);
 
 <ASSIGN_VAL>{
        [^[:blank:]\n]+.*       {
@@ -142,71 +166,17 @@ n [A-Za-z0-9_-]
        .
 }
 
-<PARAM>{
-       "&&"    return T_AND;
-       "||"    return T_OR;
-       "("     return T_OPEN_PAREN;
-       ")"     return T_CLOSE_PAREN;
-       "!"     return T_NOT;
-       "="     return T_EQUAL;
-       "!="    return T_UNEQUAL;
-       "<="    return T_LESS_EQUAL;
-       ">="    return T_GREATER_EQUAL;
-       "<"     return T_LESS;
-       ">"     return T_GREATER;
-       \"|\'   {
-               str = yytext[0];
-               new_string();
-               BEGIN(STRING);
-       }
-       \n      BEGIN(INITIAL); return T_EOL;
-       ({n}|[/.])+     {
-               const struct kconf_id *id = kconf_id_lookup(yytext, yyleng);
-               if (id && id->flags & TF_PARAM) {
-                       yylval.id = id;
-                       return id->token;
-               }
-               alloc_string(yytext, yyleng);
-               yylval.string = text;
-               return T_WORD;
-       }
-       ({n}|[/.$])+    {
-               /* this token includes at least one '$' */
-               yylval.string = expand_token(yytext, yyleng);
-               if (strlen(yylval.string))
-                       return T_WORD;
-               free(yylval.string);
-       }
-       #.*     /* comment */
-       \\\n    ;
-       [[:blank:]]+
-       .       warn_ignored_character(*yytext);
-       <<EOF>> {
-               BEGIN(INITIAL);
-       }
-}
-
 <STRING>{
        "$".*   append_expanded_string(yytext);
-       [^$'"\\\n]+/\n  {
-               append_string(yytext, yyleng);
-               yylval.string = text;
-               return T_WORD_QUOTE;
-       }
        [^$'"\\\n]+     {
                append_string(yytext, yyleng);
        }
-       \\.?/\n {
-               append_string(yytext + 1, yyleng - 1);
-               yylval.string = text;
-               return T_WORD_QUOTE;
-       }
        \\.?    {
                append_string(yytext + 1, yyleng - 1);
        }
        \'|\"   {
                if (str == yytext[0]) {
-                       BEGIN(PARAM);
+                       BEGIN(INITIAL);
                        yylval.string = text;
                        return T_WORD_QUOTE;
                } else
@@ -216,11 +186,15 @@ n [A-Za-z0-9_-]
                fprintf(stderr,
                        "%s:%d:warning: multi-line strings not supported\n",
                        zconf_curname(), zconf_lineno());
+               unput('\n');
                BEGIN(INITIAL);
-               return T_EOL;
+               yylval.string = text;
+               return T_WORD_QUOTE;
        }
        <<EOF>> {
                BEGIN(INITIAL);
+               yylval.string = text;
+               return T_WORD_QUOTE;
        }
 }
 
@@ -271,6 +245,12 @@ n  [A-Za-z0-9_-]
 }
 
 <<EOF>>        {
+       BEGIN(INITIAL);
+
+       if (prev_token != T_EOL && prev_token != T_HELPTEXT)
+               fprintf(stderr, "%s:%d:warning: no new line at end of file\n",
+                       current_file->name, yylineno);
+
        if (current_file) {
                zconf_endfile();
                return T_EOL;
@@ -280,6 +260,41 @@ n  [A-Za-z0-9_-]
 }
 
 %%
+
+/* second stage lexer */
+int yylex(void)
+{
+       int token;
+
+repeat:
+       token = yylex1();
+
+       if (prev_token == T_EOL || prev_token == T_HELPTEXT) {
+               if (token == T_EOL) {
+                       /* Do not pass unneeded T_EOL to the parser. */
+                       goto repeat;
+               } else {
+                       /*
+                        * For the parser, update file/lineno at the first token
+                        * of each statement. Generally, \n is a statement
+                        * terminator in Kconfig, but it is not always true
+                        * because \n could be escaped by a backslash.
+                        */
+                       current_pos.file = current_file;
+                       current_pos.lineno = yylineno;
+               }
+       }
+
+       if (prev_prev_token == T_EOL && prev_token == T_WORD &&
+           (token == T_EQUAL || token == T_COLON_EQUAL || token == 
T_PLUS_EQUAL))
+               BEGIN(ASSIGN_VAL);
+
+       prev_prev_token = prev_token;
+       prev_token = token;
+
+       return token;
+}
+
 static char *expand_token(const char *in, size_t n)
 {
        char *out;
@@ -363,7 +378,8 @@ FILE *zconf_fopen(const char *name)
        if (!f && name != NULL && name[0] != '/') {
                env = getenv(SRCTREE);
                if (env) {
-                       sprintf(fullname, "%s/%s", env, name);
+                       snprintf(fullname, sizeof(fullname),
+                                "%s/%s", env, name);
                        f = fopen(fullname, "r");
                }
        }
diff --git a/scripts/kconfig/lkc.h b/scripts/kconfig/lkc.h
index 9eb7c837c..cbc7658ee 100644
--- a/scripts/kconfig/lkc.h
+++ b/scripts/kconfig/lkc.h
@@ -1,6 +1,6 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Copyright (C) 2002 Roman Zippel <[email protected]>
- * Released under the terms of the GNU GPL v2.0.
  */
 
 #ifndef LKC_H
@@ -30,10 +30,6 @@ static inline const char *CONFIG_prefix(void)
 #undef CONFIG_
 #define CONFIG_ CONFIG_prefix()
 
-#define TF_COMMAND     0x0001
-#define TF_PARAM       0x0002
-#define TF_OPTION      0x0004
-
 enum conf_def_mode {
        def_default,
        def_yes,
@@ -42,17 +38,6 @@ enum conf_def_mode {
        def_random
 };
 
-#define T_OPT_MODULES          1
-#define T_OPT_DEFCONFIG_LIST   2
-#define T_OPT_ALLNOCONFIG_Y    4
-
-struct kconf_id {
-       const char *name;
-       int token;
-       unsigned int flags;
-       enum symbol_type stype;
-};
-
 extern int yylineno;
 void zconfdump(FILE *out);
 void zconf_starthelp(void);
@@ -64,7 +49,6 @@ const char *zconf_curname(void);
 
 /* confdata.c */
 const char *conf_get_configname(void);
-const char *conf_get_autoconfig_name(void);
 char *conf_get_default_confname(void);
 void sym_set_change_count(int count);
 void sym_add_change_count(int count);
@@ -91,7 +75,9 @@ void menu_add_visibility(struct expr *dep);
 struct property *menu_add_prompt(enum prop_type type, char *prompt, struct 
expr *dep);
 void menu_add_expr(enum prop_type type, struct expr *expr, struct expr *dep);
 void menu_add_symbol(enum prop_type type, struct symbol *sym, struct expr 
*dep);
-void menu_add_option(int token, char *arg);
+void menu_add_option_modules(void);
+void menu_add_option_defconfig_list(void);
+void menu_add_option_allnoconfig_y(void);
 void menu_finalize(struct menu *parent);
 void menu_set_type(int type);
 
@@ -103,6 +89,9 @@ void *xrealloc(void *p, size_t size);
 char *xstrdup(const char *s);
 char *xstrndup(const char *s, size_t n);
 
+/* lexer.l */
+int yylex(void);
+
 struct gstr {
        size_t len;
        char  *s;
@@ -121,6 +110,7 @@ const char *str_get(struct gstr *gs);
 /* symbol.c */
 void sym_clear_all_valid(void);
 struct symbol *sym_choice_default(struct symbol *sym);
+struct property *sym_get_range_prop(struct symbol *sym);
 const char *sym_get_string_default(struct symbol *sym);
 struct symbol *sym_check_deps(struct symbol *sym);
 struct property *prop_alloc(enum prop_type type, struct symbol *sym);
diff --git a/scripts/kconfig/lxdialog/.gitignore 
b/scripts/kconfig/lxdialog/.gitignore
deleted file mode 100644
index 90b08ff02..000000000
--- a/scripts/kconfig/lxdialog/.gitignore
+++ /dev/null
@@ -1,4 +0,0 @@
-#
-# Generated files
-#
-lxdialog
diff --git a/scripts/kconfig/lxdialog/BIG.FAT.WARNING 
b/scripts/kconfig/lxdialog/BIG.FAT.WARNING
index a8999d82b..7cb5a7ec9 100644
--- a/scripts/kconfig/lxdialog/BIG.FAT.WARNING
+++ b/scripts/kconfig/lxdialog/BIG.FAT.WARNING
@@ -1,4 +1,4 @@
 This is NOT the official version of dialog.  This version has been
 significantly modified from the original.  It is for use by the Linux
-kernel configuration script.  Please do not bother Savio Lam with 
+kernel configuration script.  Please do not bother Savio Lam with
 questions about this program.
diff --git a/scripts/kconfig/lxdialog/checklist.c 
b/scripts/kconfig/lxdialog/checklist.c
index 2e96323ad..fd161cfff 100644
--- a/scripts/kconfig/lxdialog/checklist.c
+++ b/scripts/kconfig/lxdialog/checklist.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  *  checklist.c -- implements the checklist box
  *
@@ -5,20 +6,6 @@
  *     Stuart Herbert - [email protected]: radiolist extension
  *     Alessandro Rubini - [email protected]: merged the two
  *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap ([email protected])
- *
- *  This program is free software; you can redistribute it and/or
- *  modify it under the terms of the GNU General Public License
- *  as published by the Free Software Foundation; either version 2
- *  of the License, or (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
 #include "dialog.h"
diff --git a/scripts/kconfig/lxdialog/dialog.h 
b/scripts/kconfig/lxdialog/dialog.h
index 0b00be5ab..68b565e3c 100644
--- a/scripts/kconfig/lxdialog/dialog.h
+++ b/scripts/kconfig/lxdialog/dialog.h
@@ -1,21 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
 /*
  *  dialog.h -- common declarations for all dialog modules
  *
  *  AUTHOR: Savio Lam ([email protected])
- *
- *  This program is free software; you can redistribute it and/or
- *  modify it under the terms of the GNU General Public License
- *  as published by the Free Software Foundation; either version 2
- *  of the License, or (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
 #include <sys/types.h>
diff --git a/scripts/kconfig/lxdialog/inputbox.c 
b/scripts/kconfig/lxdialog/inputbox.c
index fe82ff6d7..1dcfb288e 100644
--- a/scripts/kconfig/lxdialog/inputbox.c
+++ b/scripts/kconfig/lxdialog/inputbox.c
@@ -1,22 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  *  inputbox.c -- implements the input box
  *
  *  ORIGINAL AUTHOR: Savio Lam ([email protected])
  *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap ([email protected])
- *
- *  This program is free software; you can redistribute it and/or
- *  modify it under the terms of the GNU General Public License
- *  as published by the Free Software Foundation; either version 2
- *  of the License, or (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
 #include "dialog.h"
@@ -126,7 +113,8 @@ do_resize:
                        case KEY_DOWN:
                                break;
                        case KEY_BACKSPACE:
-                       case 127:
+                       case 8:   /* ^H */
+                       case 127: /* ^? */
                                if (pos) {
                                        wattrset(dialog, dlg.inputbox.atr);
                                        if (input_x == 0) {
diff --git a/scripts/kconfig/lxdialog/menubox.c 
b/scripts/kconfig/lxdialog/menubox.c
index d70cab361..58c2f8afe 100644
--- a/scripts/kconfig/lxdialog/menubox.c
+++ b/scripts/kconfig/lxdialog/menubox.c
@@ -1,22 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  *  menubox.c -- implements the menu box
  *
  *  ORIGINAL AUTHOR: Savio Lam ([email protected])
  *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap ([email protected])
- *
- *  This program is free software; you can redistribute it and/or
- *  modify it under the terms of the GNU General Public License
- *  as published by the Free Software Foundation; either version 2
- *  of the License, or (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
 /*
diff --git a/scripts/kconfig/lxdialog/textbox.c 
b/scripts/kconfig/lxdialog/textbox.c
index 88d2818ed..4e339b126 100644
--- a/scripts/kconfig/lxdialog/textbox.c
+++ b/scripts/kconfig/lxdialog/textbox.c
@@ -1,22 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  *  textbox.c -- implements the text box
  *
  *  ORIGINAL AUTHOR: Savio Lam ([email protected])
  *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap ([email protected])
- *
- *  This program is free software; you can redistribute it and/or
- *  modify it under the terms of the GNU General Public License
- *  as published by the Free Software Foundation; either version 2
- *  of the License, or (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
 #include "dialog.h"
diff --git a/scripts/kconfig/lxdialog/util.c b/scripts/kconfig/lxdialog/util.c
index f7abdeb92..1b490d4af 100644
--- a/scripts/kconfig/lxdialog/util.c
+++ b/scripts/kconfig/lxdialog/util.c
@@ -1,22 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  *  util.c
  *
  *  ORIGINAL AUTHOR: Savio Lam ([email protected])
  *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap ([email protected])
- *
- *  This program is free software; you can redistribute it and/or
- *  modify it under the terms of the GNU General Public License
- *  as published by the Free Software Foundation; either version 2
- *  of the License, or (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
 #include <stdarg.h>
diff --git a/scripts/kconfig/lxdialog/yesno.c b/scripts/kconfig/lxdialog/yesno.c
index cd1223c90..bcaac9b7b 100644
--- a/scripts/kconfig/lxdialog/yesno.c
+++ b/scripts/kconfig/lxdialog/yesno.c
@@ -1,22 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  *  yesno.c -- implements the yes/no box
  *
  *  ORIGINAL AUTHOR: Savio Lam ([email protected])
  *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap ([email protected])
- *
- *  This program is free software; you can redistribute it and/or
- *  modify it under the terms of the GNU General Public License
- *  as published by the Free Software Foundation; either version 2
- *  of the License, or (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
 #include "dialog.h"
diff --git a/scripts/kconfig/mconf.c b/scripts/kconfig/mconf.c
index 143c05fec..694091f3e 100644
--- a/scripts/kconfig/mconf.c
+++ b/scripts/kconfig/mconf.c
@@ -1,6 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2002 Roman Zippel <[email protected]>
- * Released under the terms of the GNU GPL v2.0.
  *
  * Introduced single menu mode (show all sub-menus in one large tree).
  * 2002-11-06 Petr Baudis <[email protected]>
@@ -936,7 +936,7 @@ static void conf_save(void)
                                set_config_filename(dialog_input_result);
                                return;
                        }
-                       show_textbox(NULL, "Can't create file!  Probably a 
nonexistent directory.", 5, 60);
+                       show_textbox(NULL, "Can't create file!", 5, 60);
                        break;
                case 1:
                        show_helptext("Save Alternate Configuration", 
save_config_help);
diff --git a/scripts/kconfig/menu.c b/scripts/kconfig/menu.c
index 4cf15d449..d9d164698 100644
--- a/scripts/kconfig/menu.c
+++ b/scripts/kconfig/menu.c
@@ -1,6 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2002 Roman Zippel <[email protected]>
- * Released under the terms of the GNU GPL v2.0.
  */
 
 #include <ctype.h>
@@ -195,29 +195,26 @@ void menu_add_symbol(enum prop_type type, struct symbol 
*sym, struct expr *dep)
        menu_add_prop(type, NULL, expr_alloc_symbol(sym), dep);
 }
 
-void menu_add_option(int token, char *arg)
+void menu_add_option_modules(void)
 {
-       switch (token) {
-       case T_OPT_MODULES:
-               if (modules_sym)
-                       zconf_error("symbol '%s' redefines option 'modules'"
-                                   " already defined by symbol '%s'",
-                                   current_entry->sym->name,
-                                   modules_sym->name
-                                   );
-               modules_sym = current_entry->sym;
-               break;
-       case T_OPT_DEFCONFIG_LIST:
-               if (!sym_defconfig_list)
-                       sym_defconfig_list = current_entry->sym;
-               else if (sym_defconfig_list != current_entry->sym)
-                       zconf_error("trying to redefine defconfig symbol");
-               sym_defconfig_list->flags |= SYMBOL_NO_WRITE;
-               break;
-       case T_OPT_ALLNOCONFIG_Y:
-               current_entry->sym->flags |= SYMBOL_ALLNOCONFIG_Y;
-               break;
-       }
+       if (modules_sym)
+               zconf_error("symbol '%s' redefines option 'modules' already 
defined by symbol '%s'",
+                           current_entry->sym->name, modules_sym->name);
+       modules_sym = current_entry->sym;
+}
+
+void menu_add_option_defconfig_list(void)
+{
+       if (!sym_defconfig_list)
+               sym_defconfig_list = current_entry->sym;
+       else if (sym_defconfig_list != current_entry->sym)
+               zconf_error("trying to redefine defconfig symbol");
+       sym_defconfig_list->flags |= SYMBOL_NO_WRITE;
+}
+
+void menu_add_option_allnoconfig_y(void)
+{
+       current_entry->sym->flags |= SYMBOL_ALLNOCONFIG_Y;
 }
 
 static int menu_validate_number(struct symbol *sym, struct symbol *sym2)
diff --git a/scripts/kconfig/merge_config.sh b/scripts/kconfig/merge_config.sh
index 0ef906499..d924c51d2 100755
--- a/scripts/kconfig/merge_config.sh
+++ b/scripts/kconfig/merge_config.sh
@@ -1,4 +1,6 @@
 #!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+#
 #  merge_config.sh - Takes a list of config fragment values, and merges
 #  them one by one. Provides warnings on overridden values, and specified
 #  values that did not make it to the resulting .config file (due to missed
@@ -10,18 +12,10 @@
 #
 #  Copyright (c) 2009-2010 Wind River Systems, Inc.
 #  Copyright 2011 Linaro
-#
-#  This program is free software; you can redistribute it and/or modify
-#  it under the terms of the GNU General Public License version 2 as
-#  published by the Free Software Foundation.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
-#  See the GNU General Public License for more details.
 
 clean_up() {
        rm -f $TMP_FILE
+       rm -f $MERGE_FILE
        exit
 }
 trap clean_up HUP INT TERM
@@ -32,6 +26,7 @@ usage() {
        echo "  -m    only merge the fragments, do not execute the make command"
        echo "  -n    use allnoconfig instead of alldefconfig"
        echo "  -r    list redundant entries when merging fragments"
+       echo "  -y    make builtin have precedence over modules"
        echo "  -O    dir to put generated output files.  Consider setting 
\$KCONFIG_CONFIG instead."
        echo
        echo "Used prefix: '$CONFIG_PREFIX'. You can redefine it with \$CONFIG_ 
environment variable."
@@ -40,6 +35,7 @@ usage() {
 RUNMAKE=true
 ALLTARGET=alldefconfig
 WARNREDUN=false
+BUILTIN=false
 OUTPUT=.
 CONFIG_PREFIX=${CONFIG_-CONFIG_}
 
@@ -64,6 +60,11 @@ while true; do
                shift
                continue
                ;;
+       "-y")
+               BUILTIN=true
+               shift
+               continue
+               ;;
        "-O")
                if [ -d $2 ];then
                        OUTPUT=$(echo $2 | sed 's/\/*$//')
@@ -106,32 +107,45 @@ 
SED_CONFIG_EXP1="s/^\(${CONFIG_PREFIX}[a-zA-Z0-9_]*\)=.*/\1/p"
 SED_CONFIG_EXP2="s/^# \(${CONFIG_PREFIX}[a-zA-Z0-9_]*\) is not set$/\1/p"
 
 TMP_FILE=$(mktemp ./.tmp.config.XXXXXXXXXX)
+MERGE_FILE=$(mktemp ./.merge_tmp.config.XXXXXXXXXX)
 
 echo "Using $INITFILE as base"
 cat $INITFILE > $TMP_FILE
 
 # Merge files, printing warnings on overridden values
-for MERGE_FILE in $MERGE_LIST ; do
-       echo "Merging $MERGE_FILE"
-       if [ ! -r "$MERGE_FILE" ]; then
-               echo "The merge file '$MERGE_FILE' does not exist.  Exit." >&2
+for ORIG_MERGE_FILE in $MERGE_LIST ; do
+       echo "Merging $ORIG_MERGE_FILE"
+       if [ ! -r "$ORIG_MERGE_FILE" ]; then
+               echo "The merge file '$ORIG_MERGE_FILE' does not exist.  Exit." 
>&2
                exit 1
        fi
+       cat $ORIG_MERGE_FILE > $MERGE_FILE
        CFG_LIST=$(sed -n -e "$SED_CONFIG_EXP1" -e "$SED_CONFIG_EXP2" 
$MERGE_FILE)
 
        for CFG in $CFG_LIST ; do
                grep -q -w $CFG $TMP_FILE || continue
                PREV_VAL=$(grep -w $CFG $TMP_FILE)
                NEW_VAL=$(grep -w $CFG $MERGE_FILE)
-               if [ "x$PREV_VAL" != "x$NEW_VAL" ] ; then
-                       echo Value of $CFG is redefined by fragment $MERGE_FILE:
+               BUILTIN_FLAG=false
+               if [ "$BUILTIN" = "true" ] && [ "${NEW_VAL#CONFIG_*=}" = "m" ] 
&& [ "${PREV_VAL#CONFIG_*=}" = "y" ]; then
+                       echo Previous  value: $PREV_VAL
+                       echo New value:       $NEW_VAL
+                       echo -y passed, will not demote y to m
+                       echo
+                       BUILTIN_FLAG=true
+               elif [ "x$PREV_VAL" != "x$NEW_VAL" ] ; then
+                       echo Value of $CFG is redefined by fragment 
$ORIG_MERGE_FILE:
                        echo Previous  value: $PREV_VAL
                        echo New value:       $NEW_VAL
                        echo
                elif [ "$WARNREDUN" = "true" ]; then
-                       echo Value of $CFG is redundant by fragment $MERGE_FILE:
+                       echo Value of $CFG is redundant by fragment 
$ORIG_MERGE_FILE:
+               fi
+               if [ "$BUILTIN_FLAG" = "false" ]; then
+                       sed -i "/$CFG[ =]/d" $TMP_FILE
+               else
+                       sed -i "/$CFG[ =]/d" $MERGE_FILE
                fi
-               sed -i "/$CFG[ =]/d" $TMP_FILE
        done
        cat $MERGE_FILE >> $TMP_FILE
 done
diff --git a/scripts/kconfig/nconf-cfg.sh b/scripts/kconfig/nconf-cfg.sh
old mode 100644
new mode 100755
diff --git a/scripts/kconfig/nconf.c b/scripts/kconfig/nconf.c
index 1ef232ae5..cbafe3bf0 100644
--- a/scripts/kconfig/nconf.c
+++ b/scripts/kconfig/nconf.c
@@ -1,9 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
- * Copyright (C) 2008 Nir Tzachar <[email protected]?
- * Released under the terms of the GNU GPL v2.0.
+ * Copyright (C) 2008 Nir Tzachar <[email protected]>
  *
  * Derived from menuconfig.
- *
  */
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE
@@ -1049,7 +1048,7 @@ static int do_match(int key, struct match_state *state, 
int *ans)
                state->match_direction = FIND_NEXT_MATCH_UP;
                *ans = get_mext_match(state->pattern,
                                state->match_direction);
-       } else if (key == KEY_BACKSPACE || key == 127) {
+       } else if (key == KEY_BACKSPACE || key == 8 || key == 127) {
                state->pattern[strlen(state->pattern)-1] = '\0';
                adj_match_dir(&state->match_direction);
        } else
@@ -1439,8 +1438,7 @@ static void conf_save(void)
                                set_config_filename(dialog_input_result);
                                return;
                        }
-                       btn_dialog(main_window, "Can't create file! "
-                               "Probably a nonexistent directory.",
+                       btn_dialog(main_window, "Can't create file!",
                                1, "<OK>");
                        break;
                case 1:
diff --git a/scripts/kconfig/nconf.gui.c b/scripts/kconfig/nconf.gui.c
index 88874acfd..77f525a86 100644
--- a/scripts/kconfig/nconf.gui.c
+++ b/scripts/kconfig/nconf.gui.c
@@ -1,9 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
- * Copyright (C) 2008 Nir Tzachar <[email protected]?
- * Released under the terms of the GNU GPL v2.0.
+ * Copyright (C) 2008 Nir Tzachar <[email protected]>
  *
  * Derived from menuconfig.
- *
  */
 #include "nconf.h"
 #include "lkc.h"
@@ -440,7 +439,8 @@ int dialog_inputbox(WINDOW *main_window,
                case KEY_F(F_EXIT):
                case KEY_F(F_BACK):
                        break;
-               case 127:
+               case 8:   /* ^H */
+               case 127: /* ^? */
                case KEY_BACKSPACE:
                        if (cursor_position > 0) {
                                memmove(&result[cursor_position-1],
diff --git a/scripts/kconfig/nconf.h b/scripts/kconfig/nconf.h
index 2b9e19f60..fa5245eb9 100644
--- a/scripts/kconfig/nconf.h
+++ b/scripts/kconfig/nconf.h
@@ -1,9 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
- * Copyright (C) 2008 Nir Tzachar <[email protected]?
- * Released under the terms of the GNU GPL v2.0.
+ * Copyright (C) 2008 Nir Tzachar <[email protected]>
  *
  * Derived from menuconfig.
- *
  */
 
 #include <ctype.h>
diff --git a/scripts/kconfig/zconf.y b/scripts/kconfig/parser.y
similarity index 74%
rename from scripts/kconfig/zconf.y
rename to scripts/kconfig/parser.y
index 22fceb264..60936c768 100644
--- a/scripts/kconfig/zconf.y
+++ b/scripts/kconfig/parser.y
@@ -1,8 +1,8 @@
-%{
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Copyright (C) 2002 Roman Zippel <[email protected]>
- * Released under the terms of the GNU GPL v2.0.
  */
+%{
 
 #include <ctype.h>
 #include <stdarg.h>
@@ -20,66 +20,68 @@
 
 int cdebug = PRINTD;
 
-int yylex(void);
 static void yyerror(const char *err);
 static void zconfprint(const char *err, ...);
 static void zconf_error(const char *err, ...);
-static bool zconf_endtoken(const struct kconf_id *id, int starttoken, int 
endtoken);
+static bool zconf_endtoken(const char *tokenname,
+                          const char *expected_tokenname);
 
 struct symbol *symbol_hash[SYMBOL_HASHSIZE];
 
 static struct menu *current_menu, *current_entry;
 
 %}
-%expect 30
 
 %union
 {
        char *string;
-       struct file *file;
        struct symbol *symbol;
        struct expr *expr;
        struct menu *menu;
-       const struct kconf_id *id;
+       enum symbol_type type;
        enum variable_flavor flavor;
 }
 
-%token <id>T_MAINMENU
-%token <id>T_MENU
-%token <id>T_ENDMENU
-%token <id>T_SOURCE
-%token <id>T_CHOICE
-%token <id>T_ENDCHOICE
-%token <id>T_COMMENT
-%token <id>T_CONFIG
-%token <id>T_MENUCONFIG
-%token <id>T_HELP
 %token <string> T_HELPTEXT
-%token <id>T_IF
-%token <id>T_ENDIF
-%token <id>T_DEPENDS
-%token <id>T_OPTIONAL
-%token <id>T_PROMPT
-%token <id>T_TYPE
-%token <id>T_DEFAULT
-%token <id>T_SELECT
-%token <id>T_IMPLY
-%token <id>T_RANGE
-%token <id>T_VISIBLE
-%token <id>T_OPTION
-%token <id>T_ON
 %token <string> T_WORD
 %token <string> T_WORD_QUOTE
-%token T_UNEQUAL
-%token T_LESS
-%token T_LESS_EQUAL
-%token T_GREATER
-%token T_GREATER_EQUAL
+%token T_ALLNOCONFIG_Y
+%token T_BOOL
+%token T_CHOICE
 %token T_CLOSE_PAREN
+%token T_COLON_EQUAL
+%token T_COMMENT
+%token T_CONFIG
+%token T_DEFAULT
+%token T_DEFCONFIG_LIST
+%token T_DEF_BOOL
+%token T_DEF_TRISTATE
+%token T_DEPENDS
+%token T_ENDCHOICE
+%token T_ENDIF
+%token T_ENDMENU
+%token T_HELP
+%token T_HEX
+%token T_IF
+%token T_IMPLY
+%token T_INT
+%token T_MAINMENU
+%token T_MENU
+%token T_MENUCONFIG
+%token T_MODULES
+%token T_ON
 %token T_OPEN_PAREN
+%token T_OPTION
+%token T_OPTIONAL
+%token T_PLUS_EQUAL
+%token T_PROMPT
+%token T_RANGE
+%token T_SELECT
+%token T_SOURCE
+%token T_STRING
+%token T_TRISTATE
+%token T_VISIBLE
 %token T_EOL
-%token <string> T_VARIABLE
-%token <flavor> T_ASSIGN
 %token <string> T_ASSIGN_VAL
 
 %left T_OR
@@ -91,12 +93,13 @@ static struct menu *current_menu, *current_entry;
 %type <string> prompt
 %type <symbol> nonconst_symbol
 %type <symbol> symbol
+%type <type> type logic_type default
 %type <expr> expr
 %type <expr> if_expr
-%type <id> end
-%type <id> option_name
+%type <string> end
 %type <menu> if_entry menu_entry choice_entry
-%type <string> symbol_option_arg word_opt assign_val
+%type <string> word_opt assign_val
+%type <flavor> assign_op
 
 %destructor {
        fprintf(stderr, "%s:%d: missing end statement for this entry\n",
@@ -105,15 +108,8 @@ static struct menu *current_menu, *current_entry;
                menu_end_menu();
 } if_entry menu_entry choice_entry
 
-%{
-/* Include kconf_id.c here so it can see the token constants. */
-#include "kconf_id.c"
-%}
-
 %%
-input: nl start | start;
-
-start: mainmenu_stmt stmt_list | stmt_list;
+input: mainmenu_stmt stmt_list | stmt_list;
 
 /* mainmenu entry */
 
@@ -127,22 +123,12 @@ stmt_list:
        | stmt_list common_stmt
        | stmt_list choice_stmt
        | stmt_list menu_stmt
-       | stmt_list end                 { zconf_error("unexpected end 
statement"); }
        | stmt_list T_WORD error T_EOL  { zconf_error("unknown statement 
\"%s\"", $2); }
-       | stmt_list option_name error T_EOL
-{
-       zconf_error("unexpected option \"%s\"", $2->name);
-}
        | stmt_list error T_EOL         { zconf_error("invalid statement"); }
 ;
 
-option_name:
-       T_DEPENDS | T_PROMPT | T_TYPE | T_SELECT | T_IMPLY | T_OPTIONAL | 
T_RANGE | T_DEFAULT | T_VISIBLE
-;
-
 common_stmt:
-         T_EOL
-       | if_stmt
+         if_stmt
        | comment_stmt
        | config_stmt
        | menuconfig_stmt
@@ -150,12 +136,6 @@ common_stmt:
        | assignment_stmt
 ;
 
-option_error:
-         T_WORD error T_EOL            { zconf_error("unknown option \"%s\"", 
$1); }
-       | error T_EOL                   { zconf_error("invalid option"); }
-;
-
-
 /* config/menuconfig entry */
 
 config_entry_start: T_CONFIG nonconst_symbol T_EOL
@@ -189,19 +169,16 @@ menuconfig_stmt: menuconfig_entry_start config_option_list
 config_option_list:
          /* empty */
        | config_option_list config_option
-       | config_option_list symbol_option
        | config_option_list depends
        | config_option_list help
-       | config_option_list option_error
-       | config_option_list T_EOL
 ;
 
-config_option: T_TYPE prompt_stmt_opt T_EOL
+config_option: type prompt_stmt_opt T_EOL
 {
-       menu_set_type($1->stype);
+       menu_set_type($1);
        printd(DEBUG_PARSE, "%s:%d:type(%u)\n",
                zconf_curname(), zconf_lineno(),
-               $1->stype);
+               $1);
 };
 
 config_option: T_PROMPT prompt if_expr T_EOL
@@ -210,14 +187,14 @@ config_option: T_PROMPT prompt if_expr T_EOL
        printd(DEBUG_PARSE, "%s:%d:prompt\n", zconf_curname(), zconf_lineno());
 };
 
-config_option: T_DEFAULT expr if_expr T_EOL
+config_option: default expr if_expr T_EOL
 {
        menu_add_expr(P_DEFAULT, $2, $3);
-       if ($1->stype != S_UNKNOWN)
-               menu_set_type($1->stype);
+       if ($1 != S_UNKNOWN)
+               menu_set_type($1);
        printd(DEBUG_PARSE, "%s:%d:default(%u)\n",
                zconf_curname(), zconf_lineno(),
-               $1->stype);
+               $1);
 };
 
 config_option: T_SELECT nonconst_symbol if_expr T_EOL
@@ -238,27 +215,20 @@ config_option: T_RANGE symbol symbol if_expr T_EOL
        printd(DEBUG_PARSE, "%s:%d:range\n", zconf_curname(), zconf_lineno());
 };
 
-symbol_option: T_OPTION symbol_option_list T_EOL
-;
+config_option: T_OPTION T_MODULES T_EOL
+{
+       menu_add_option_modules();
+};
 
-symbol_option_list:
-         /* empty */
-       | symbol_option_list T_WORD symbol_option_arg
+config_option: T_OPTION T_DEFCONFIG_LIST T_EOL
 {
-       const struct kconf_id *id = kconf_id_lookup($2, strlen($2));
-       if (id && id->flags & TF_OPTION) {
-               menu_add_option(id->token, $3);
-               free($3);
-       }
-       else
-               zconfprint("warning: ignoring unknown option %s", $2);
-       free($2);
+       menu_add_option_defconfig_list();
 };
 
-symbol_option_arg:
-         /* empty */           { $$ = NULL; }
-       | T_EQUAL prompt        { $$ = $2; }
-;
+config_option: T_OPTION T_ALLNOCONFIG_Y T_EOL
+{
+       menu_add_option_allnoconfig_y();
+};
 
 /* choice entry */
 
@@ -279,7 +249,7 @@ choice_entry: choice choice_option_list
 
 choice_end: end
 {
-       if (zconf_endtoken($1, T_CHOICE, T_ENDCHOICE)) {
+       if (zconf_endtoken($1, "choice")) {
                menu_end_menu();
                printd(DEBUG_PARSE, "%s:%d:endchoice\n", zconf_curname(), 
zconf_lineno());
        }
@@ -293,8 +263,6 @@ choice_option_list:
        | choice_option_list choice_option
        | choice_option_list depends
        | choice_option_list help
-       | choice_option_list T_EOL
-       | choice_option_list option_error
 ;
 
 choice_option: T_PROMPT prompt if_expr T_EOL
@@ -303,15 +271,11 @@ choice_option: T_PROMPT prompt if_expr T_EOL
        printd(DEBUG_PARSE, "%s:%d:prompt\n", zconf_curname(), zconf_lineno());
 };
 
-choice_option: T_TYPE prompt_stmt_opt T_EOL
+choice_option: logic_type prompt_stmt_opt T_EOL
 {
-       if ($1->stype == S_BOOLEAN || $1->stype == S_TRISTATE) {
-               menu_set_type($1->stype);
-               printd(DEBUG_PARSE, "%s:%d:type(%u)\n",
-                       zconf_curname(), zconf_lineno(),
-                       $1->stype);
-       } else
-               YYERROR;
+       menu_set_type($1);
+       printd(DEBUG_PARSE, "%s:%d:type(%u)\n",
+              zconf_curname(), zconf_lineno(), $1);
 };
 
 choice_option: T_OPTIONAL T_EOL
@@ -322,14 +286,26 @@ choice_option: T_OPTIONAL T_EOL
 
 choice_option: T_DEFAULT nonconst_symbol if_expr T_EOL
 {
-       if ($1->stype == S_UNKNOWN) {
-               menu_add_symbol(P_DEFAULT, $2, $3);
-               printd(DEBUG_PARSE, "%s:%d:default\n",
-                       zconf_curname(), zconf_lineno());
-       } else
-               YYERROR;
+       menu_add_symbol(P_DEFAULT, $2, $3);
+       printd(DEBUG_PARSE, "%s:%d:default\n",
+              zconf_curname(), zconf_lineno());
 };
 
+type:
+         logic_type
+       | T_INT                 { $$ = S_INT; }
+       | T_HEX                 { $$ = S_HEX; }
+       | T_STRING              { $$ = S_STRING; }
+
+logic_type:
+         T_BOOL                { $$ = S_BOOLEAN; }
+       | T_TRISTATE            { $$ = S_TRISTATE; }
+
+default:
+         T_DEFAULT             { $$ = S_UNKNOWN; }
+       | T_DEF_BOOL            { $$ = S_BOOLEAN; }
+       | T_DEF_TRISTATE        { $$ = S_TRISTATE; }
+
 choice_block:
          /* empty */
        | choice_block common_stmt
@@ -347,20 +323,13 @@ if_entry: T_IF expr T_EOL
 
 if_end: end
 {
-       if (zconf_endtoken($1, T_IF, T_ENDIF)) {
+       if (zconf_endtoken($1, "if")) {
                menu_end_menu();
                printd(DEBUG_PARSE, "%s:%d:endif\n", zconf_curname(), 
zconf_lineno());
        }
 };
 
-if_stmt: if_entry if_block if_end
-;
-
-if_block:
-         /* empty */
-       | if_block common_stmt
-       | if_block menu_stmt
-       | if_block choice_stmt
+if_stmt: if_entry stmt_list if_end
 ;
 
 /* menu entry */
@@ -372,27 +341,26 @@ menu: T_MENU prompt T_EOL
        printd(DEBUG_PARSE, "%s:%d:menu\n", zconf_curname(), zconf_lineno());
 };
 
-menu_entry: menu visibility_list depends_list
+menu_entry: menu menu_option_list
 {
        $$ = menu_add_menu();
 };
 
 menu_end: end
 {
-       if (zconf_endtoken($1, T_MENU, T_ENDMENU)) {
+       if (zconf_endtoken($1, "menu")) {
                menu_end_menu();
                printd(DEBUG_PARSE, "%s:%d:endmenu\n", zconf_curname(), 
zconf_lineno());
        }
 };
 
-menu_stmt: menu_entry menu_block menu_end
+menu_stmt: menu_entry stmt_list menu_end
 ;
 
-menu_block:
+menu_option_list:
          /* empty */
-       | menu_block common_stmt
-       | menu_block menu_stmt
-       | menu_block choice_stmt
+       | menu_option_list visible
+       | menu_option_list depends
 ;
 
 source_stmt: T_SOURCE prompt T_EOL
@@ -411,7 +379,12 @@ comment: T_COMMENT prompt T_EOL
        printd(DEBUG_PARSE, "%s:%d:comment\n", zconf_curname(), zconf_lineno());
 };
 
-comment_stmt: comment depends_list
+comment_stmt: comment comment_option_list
+;
+
+comment_option_list:
+         /* empty */
+       | comment_option_list depends
 ;
 
 /* help option */
@@ -440,13 +413,6 @@ help: help_start T_HELPTEXT
 
 /* depends option */
 
-depends_list:
-         /* empty */
-       | depends_list depends
-       | depends_list T_EOL
-       | depends_list option_error
-;
-
 depends: T_DEPENDS T_ON expr T_EOL
 {
        menu_add_dep($3);
@@ -454,14 +420,7 @@ depends: T_DEPENDS T_ON expr T_EOL
 };
 
 /* visibility option */
-
-visibility_list:
-         /* empty */
-       | visibility_list visible
-       | visibility_list T_EOL
-;
-
-visible: T_VISIBLE if_expr
+visible: T_VISIBLE if_expr T_EOL
 {
        menu_add_visibility($2);
 };
@@ -479,14 +438,9 @@ prompt:      T_WORD
        | T_WORD_QUOTE
 ;
 
-end:     T_ENDMENU T_EOL       { $$ = $1; }
-       | T_ENDCHOICE T_EOL     { $$ = $1; }
-       | T_ENDIF T_EOL         { $$ = $1; }
-;
-
-nl:
-         T_EOL
-       | nl T_EOL
+end:     T_ENDMENU T_EOL       { $$ = "menu"; }
+       | T_ENDCHOICE T_EOL     { $$ = "choice"; }
+       | T_ENDIF T_EOL         { $$ = "if"; }
 ;
 
 if_expr:  /* empty */                  { $$ = NULL; }
@@ -518,7 +472,13 @@ word_opt: /* empty */                      { $$ = NULL; }
 
 /* assignment statement */
 
-assignment_stmt:  T_VARIABLE T_ASSIGN assign_val T_EOL { variable_add($1, $3, 
$2); free($1); free($3); }
+assignment_stmt:  T_WORD assign_op assign_val T_EOL    { variable_add($1, $3, 
$2); free($1); free($3); }
+
+assign_op:
+         T_EQUAL       { $$ = VAR_RECURSIVE; }
+       | T_COLON_EQUAL { $$ = VAR_SIMPLE; }
+       | T_PLUS_EQUAL  { $$ = VAR_APPEND; }
+;
 
 assign_val:
        /* empty */             { $$ = xstrdup(""); };
@@ -563,35 +523,21 @@ void conf_parse(const char *name)
        sym_set_change_count(1);
 }
 
-static const char *zconf_tokenname(int token)
-{
-       switch (token) {
-       case T_MENU:            return "menu";
-       case T_ENDMENU:         return "endmenu";
-       case T_CHOICE:          return "choice";
-       case T_ENDCHOICE:       return "endchoice";
-       case T_IF:              return "if";
-       case T_ENDIF:           return "endif";
-       case T_DEPENDS:         return "depends";
-       case T_VISIBLE:         return "visible";
-       }
-       return "<token>";
-}
-
-static bool zconf_endtoken(const struct kconf_id *id, int starttoken, int 
endtoken)
+static bool zconf_endtoken(const char *tokenname,
+                          const char *expected_tokenname)
 {
-       if (id->token != endtoken) {
+       if (strcmp(tokenname, expected_tokenname)) {
                zconf_error("unexpected '%s' within %s block",
-                       id->name, zconf_tokenname(starttoken));
+                           tokenname, expected_tokenname);
                yynerrs++;
                return false;
        }
        if (current_menu->file != current_file) {
                zconf_error("'%s' in different file than '%s'",
-                       id->name, zconf_tokenname(starttoken));
+                           tokenname, expected_tokenname);
                fprintf(stderr, "%s:%d: location of the '%s'\n",
                        current_menu->file->name, current_menu->lineno,
-                       zconf_tokenname(starttoken));
+                       expected_tokenname);
                yynerrs++;
                return false;
        }
@@ -781,10 +727,5 @@ void zconfdump(FILE *out)
        }
 }
 
-#include "zconf.lex.c"
 #include "util.c"
-#include "confdata.c"
-#include "expr.c"
-#include "symbol.c"
 #include "menu.c"
-#include "preprocess.c"
diff --git a/scripts/kconfig/preprocess.c b/scripts/kconfig/preprocess.c
index 5ca2df790..592dfbfa9 100644
--- a/scripts/kconfig/preprocess.c
+++ b/scripts/kconfig/preprocess.c
@@ -2,6 +2,7 @@
 //
 // Copyright (C) 2018 Masahiro Yamada <[email protected]>
 
+#include <ctype.h>
 #include <stdarg.h>
 #include <stdbool.h>
 #include <stdio.h>
@@ -9,6 +10,7 @@
 #include <string.h>
 
 #include "list.h"
+#include "lkc.h"
 
 #define ARRAY_SIZE(arr)                (sizeof(arr) / sizeof((arr)[0]))
 
@@ -555,8 +557,7 @@ char *expand_string(const char *in)
 
 static bool is_end_of_token(char c)
 {
-       /* Why are '.' and '/' valid characters for symbols? */
-       return !(isalnum(c) || c == '_' || c == '-' || c == '.' || c == '/');
+       return !(isalnum(c) || c == '_' || c == '-');
 }
 
 /*
diff --git a/scripts/kconfig/qconf.cc b/scripts/kconfig/qconf.cc
index ef4310f25..ce7fc87a4 100644
--- a/scripts/kconfig/qconf.cc
+++ b/scripts/kconfig/qconf.cc
@@ -1,7 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2002 Roman Zippel <[email protected]>
  * Copyright (C) 2015 Boris Barbulovski <[email protected]>
- * Released under the terms of the GNU GPL v2.0.
  */
 
 #include <qglobal.h>
@@ -32,7 +32,7 @@
 #include "qconf.h"
 
 #include "qconf.moc"
-#include "images.c"
+#include "images.h"
 
 
 static QApplication *configApp;
@@ -1392,6 +1392,8 @@ ConfigMainWindow::ConfigMainWindow(void)
        conf_set_changed_callback(conf_changed);
        // Set saveAction's initial state
        conf_changed();
+       configname = xstrdup(conf_get_configname());
+
        QAction *saveAsAction = new QAction("Save &As...", this);
          connect(saveAsAction, SIGNAL(triggered(bool)), SLOT(saveConfigAs()));
        QAction *searchAction = new QAction("&Find", this);
@@ -1520,17 +1522,29 @@ ConfigMainWindow::ConfigMainWindow(void)
 
 void ConfigMainWindow::loadConfig(void)
 {
-       QString s = QFileDialog::getOpenFileName(this, "", 
conf_get_configname());
-       if (s.isNull())
+       QString str;
+       QByteArray ba;
+       const char *name;
+
+       str = QFileDialog::getOpenFileName(this, "", configname);
+       if (str.isNull())
                return;
-       if (conf_read(QFile::encodeName(s)))
+
+       ba = str.toLocal8Bit();
+       name = ba.data();
+
+       if (conf_read(name))
                QMessageBox::information(this, "qconf", "Unable to load 
configuration!");
+
+       free(configname);
+       configname = xstrdup(name);
+
        ConfigView::updateListAll();
 }
 
 bool ConfigMainWindow::saveConfig(void)
 {
-       if (conf_write(NULL)) {
+       if (conf_write(configname)) {
                QMessageBox::information(this, "qconf", "Unable to save 
configuration!");
                return false;
        }
@@ -1541,10 +1555,24 @@ bool ConfigMainWindow::saveConfig(void)
 
 void ConfigMainWindow::saveConfigAs(void)
 {
-       QString s = QFileDialog::getSaveFileName(this, "", 
conf_get_configname());
-       if (s.isNull())
+       QString str;
+       QByteArray ba;
+       const char *name;
+
+       str = QFileDialog::getSaveFileName(this, "", configname);
+       if (str.isNull())
                return;
-       saveConfig();
+
+       ba = str.toLocal8Bit();
+       name = ba.data();
+
+       if (conf_write(name)) {
+               QMessageBox::information(this, "qconf", "Unable to save 
configuration!");
+       }
+       conf_write_autoconf(0);
+
+       free(configname);
+       configname = xstrdup(name);
 }
 
 void ConfigMainWindow::searchConfig(void)
diff --git a/scripts/kconfig/qconf.h b/scripts/kconfig/qconf.h
index a40036d1b..45bfe9b2b 100644
--- a/scripts/kconfig/qconf.h
+++ b/scripts/kconfig/qconf.h
@@ -1,6 +1,6 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Copyright (C) 2002 Roman Zippel <[email protected]>
- * Released under the terms of the GNU GPL v2.0.
  */
 
 #include <QTextBrowser>
@@ -291,6 +291,7 @@ protected:
 class ConfigMainWindow : public QMainWindow {
        Q_OBJECT
 
+       char *configname;
        static QAction *saveAction;
        static void conf_changed(void);
 public:
diff --git a/scripts/kconfig/streamline_config.pl 
b/scripts/kconfig/streamline_config.pl
index 4686531e2..08d76d7b3 100755
--- a/scripts/kconfig/streamline_config.pl
+++ b/scripts/kconfig/streamline_config.pl
@@ -1,7 +1,7 @@
 #!/usr/bin/env perl
+# SPDX-License-Identifier: GPL-2.0
 #
 # Copyright 2005-2009 - Steven Rostedt
-# Licensed under the terms of the GNU GPL License version 2
 #
 #  It's simple enough to figure out how this works.
 #  If not, then you can ask me at [email protected]
diff --git a/scripts/kconfig/symbol.c b/scripts/kconfig/symbol.c
index 703b9b899..1f9266dad 100644
--- a/scripts/kconfig/symbol.c
+++ b/scripts/kconfig/symbol.c
@@ -1,6 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2002 Roman Zippel <[email protected]>
- * Released under the terms of the GNU GPL v2.0.
  */
 
 #include <ctype.h>
@@ -61,8 +61,6 @@ const char *sym_type_name(enum symbol_type type)
                return "string";
        case S_UNKNOWN:
                return "unknown";
-       case S_OTHER:
-               break;
        }
        return "???";
 }
@@ -88,7 +86,7 @@ static struct property *sym_get_default_prop(struct symbol 
*sym)
        return NULL;
 }
 
-static struct property *sym_get_range_prop(struct symbol *sym)
+struct property *sym_get_range_prop(struct symbol *sym)
 {
        struct property *prop;
 
@@ -757,7 +755,6 @@ const char *sym_get_string_default(struct symbol *sym)
                return str;
        case S_STRING:
                return str;
-       case S_OTHER:
        case S_UNKNOWN:
                break;
        }
diff --git a/scripts/kconfig/tests/auto_submenu/Kconfig 
b/scripts/kconfig/tests/auto_submenu/Kconfig
index c17bf2caa..b20761edc 100644
--- a/scripts/kconfig/tests/auto_submenu/Kconfig
+++ b/scripts/kconfig/tests/auto_submenu/Kconfig
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0
+
 config A
        bool "A"
        default y
diff --git a/scripts/kconfig/tests/auto_submenu/__init__.py 
b/scripts/kconfig/tests/auto_submenu/__init__.py
index 32e79b85f..25abd927f 100644
--- a/scripts/kconfig/tests/auto_submenu/__init__.py
+++ b/scripts/kconfig/tests/auto_submenu/__init__.py
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 """
 Create submenu for symbols that depend on the preceding one.
 
diff --git a/scripts/kconfig/tests/choice/Kconfig 
b/scripts/kconfig/tests/choice/Kconfig
index cc60e9ce2..a412205b1 100644
--- a/scripts/kconfig/tests/choice/Kconfig
+++ b/scripts/kconfig/tests/choice/Kconfig
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0
+
 config MODULES
        bool "Enable loadable module support"
        option modules
diff --git a/scripts/kconfig/tests/choice/__init__.py 
b/scripts/kconfig/tests/choice/__init__.py
index 9edcc5262..4318fce05 100644
--- a/scripts/kconfig/tests/choice/__init__.py
+++ b/scripts/kconfig/tests/choice/__init__.py
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 """
 Basic choice tests.
 
diff --git a/scripts/kconfig/tests/choice_value_with_m_dep/Kconfig 
b/scripts/kconfig/tests/choice_value_with_m_dep/Kconfig
index 11ac25c26..7106c26bb 100644
--- a/scripts/kconfig/tests/choice_value_with_m_dep/Kconfig
+++ b/scripts/kconfig/tests/choice_value_with_m_dep/Kconfig
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0
+
 config MODULES
        def_bool y
        option modules
diff --git a/scripts/kconfig/tests/choice_value_with_m_dep/__init__.py 
b/scripts/kconfig/tests/choice_value_with_m_dep/__init__.py
index f8d728c7b..075b4e086 100644
--- a/scripts/kconfig/tests/choice_value_with_m_dep/__init__.py
+++ b/scripts/kconfig/tests/choice_value_with_m_dep/__init__.py
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 """
 Hide tristate choice values with mod dependency in y choice.
 
diff --git a/scripts/kconfig/tests/err_recursive_inc/Kconfig 
b/scripts/kconfig/tests/err_recursive_inc/Kconfig
index 0e4c8750a..c6f4adec7 100644
--- a/scripts/kconfig/tests/err_recursive_inc/Kconfig
+++ b/scripts/kconfig/tests/err_recursive_inc/Kconfig
@@ -1 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
 source "Kconfig.inc1"
diff --git a/scripts/kconfig/tests/err_recursive_inc/Kconfig.inc1 
b/scripts/kconfig/tests/err_recursive_inc/Kconfig.inc1
index 00e408d65..01cbf0d69 100644
--- a/scripts/kconfig/tests/err_recursive_inc/Kconfig.inc1
+++ b/scripts/kconfig/tests/err_recursive_inc/Kconfig.inc1
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 
 
 
diff --git a/scripts/kconfig/tests/err_recursive_inc/Kconfig.inc2 
b/scripts/kconfig/tests/err_recursive_inc/Kconfig.inc2
index 349ea2db1..82351075a 100644
--- a/scripts/kconfig/tests/err_recursive_inc/Kconfig.inc2
+++ b/scripts/kconfig/tests/err_recursive_inc/Kconfig.inc2
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 
 
 source "Kconfig.inc3"
diff --git a/scripts/kconfig/tests/err_recursive_inc/Kconfig.inc3 
b/scripts/kconfig/tests/err_recursive_inc/Kconfig.inc3
index 0e4c8750a..c6f4adec7 100644
--- a/scripts/kconfig/tests/err_recursive_inc/Kconfig.inc3
+++ b/scripts/kconfig/tests/err_recursive_inc/Kconfig.inc3
@@ -1 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
 source "Kconfig.inc1"
diff --git a/scripts/kconfig/tests/err_recursive_inc/__init__.py 
b/scripts/kconfig/tests/err_recursive_inc/__init__.py
index 0e4c839c5..27aa1895a 100644
--- a/scripts/kconfig/tests/err_recursive_inc/__init__.py
+++ b/scripts/kconfig/tests/err_recursive_inc/__init__.py
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 """
 Detect recursive inclusion error.
 
diff --git a/scripts/kconfig/tests/err_recursive_inc/expected_stderr 
b/scripts/kconfig/tests/err_recursive_inc/expected_stderr
index 6b582eee2..b070a31fd 100644
--- a/scripts/kconfig/tests/err_recursive_inc/expected_stderr
+++ b/scripts/kconfig/tests/err_recursive_inc/expected_stderr
@@ -1,6 +1,6 @@
 Recursive inclusion detected.
 Inclusion path:
   current file : Kconfig.inc1
-  included from: Kconfig.inc3:1
-  included from: Kconfig.inc2:3
-  included from: Kconfig.inc1:4
+  included from: Kconfig.inc3:2
+  included from: Kconfig.inc2:4
+  included from: Kconfig.inc1:5
diff --git a/scripts/kconfig/tests/inter_choice/Kconfig 
b/scripts/kconfig/tests/inter_choice/Kconfig
index e44449f07..5698a4018 100644
--- a/scripts/kconfig/tests/inter_choice/Kconfig
+++ b/scripts/kconfig/tests/inter_choice/Kconfig
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0
+
 config MODULES
        def_bool y
        option modules
diff --git a/scripts/kconfig/tests/inter_choice/__init__.py 
b/scripts/kconfig/tests/inter_choice/__init__.py
index 5c7fc365e..ffea6b114 100644
--- a/scripts/kconfig/tests/inter_choice/__init__.py
+++ b/scripts/kconfig/tests/inter_choice/__init__.py
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 """
 Do not affect user-assigned choice value by another choice.
 
diff --git a/scripts/kconfig/tests/new_choice_with_dep/Kconfig 
b/scripts/kconfig/tests/new_choice_with_dep/Kconfig
index 53ef1b86e..127731c04 100644
--- a/scripts/kconfig/tests/new_choice_with_dep/Kconfig
+++ b/scripts/kconfig/tests/new_choice_with_dep/Kconfig
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0
+
 config A
        bool "A"
        help
diff --git a/scripts/kconfig/tests/new_choice_with_dep/__init__.py 
b/scripts/kconfig/tests/new_choice_with_dep/__init__.py
index f0e0ead0f..fe9d32253 100644
--- a/scripts/kconfig/tests/new_choice_with_dep/__init__.py
+++ b/scripts/kconfig/tests/new_choice_with_dep/__init__.py
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 """
 Ask new choice values when they become visible.
 
diff --git a/scripts/kconfig/tests/no_write_if_dep_unmet/Kconfig 
b/scripts/kconfig/tests/no_write_if_dep_unmet/Kconfig
index c00b8fe54..4767aab6d 100644
--- a/scripts/kconfig/tests/no_write_if_dep_unmet/Kconfig
+++ b/scripts/kconfig/tests/no_write_if_dep_unmet/Kconfig
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0
+
 config A
        bool "A"
 
diff --git a/scripts/kconfig/tests/no_write_if_dep_unmet/__init__.py 
b/scripts/kconfig/tests/no_write_if_dep_unmet/__init__.py
index 207261b0f..ffd469d1f 100644
--- a/scripts/kconfig/tests/no_write_if_dep_unmet/__init__.py
+++ b/scripts/kconfig/tests/no_write_if_dep_unmet/__init__.py
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 """
 Do not write choice values to .config if the dependency is unmet.
 
diff --git a/scripts/kconfig/tests/rand_nested_choice/Kconfig 
b/scripts/kconfig/tests/rand_nested_choice/Kconfig
index c591d5129..8350de7f7 100644
--- a/scripts/kconfig/tests/rand_nested_choice/Kconfig
+++ b/scripts/kconfig/tests/rand_nested_choice/Kconfig
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0
+
 choice
        prompt "choice"
 
diff --git a/scripts/kconfig/tests/rand_nested_choice/__init__.py 
b/scripts/kconfig/tests/rand_nested_choice/__init__.py
index e729a4e85..9e4b2db53 100644
--- a/scripts/kconfig/tests/rand_nested_choice/__init__.py
+++ b/scripts/kconfig/tests/rand_nested_choice/__init__.py
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 """
 Set random values recursively in nested choices.
 
diff --git a/scripts/kconfig/util.c b/scripts/kconfig/util.c
index d999683bb..29585394d 100644
--- a/scripts/kconfig/util.c
+++ b/scripts/kconfig/util.c
@@ -1,8 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2002-2005 Roman Zippel <[email protected]>
  * Copyright (C) 2002-2005 Sam Ravnborg <[email protected]>
- *
- * Released under the terms of the GNU GPL v2.0.
  */
 
 #include <stdarg.h>
-- 
2.17.1


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