[GIT PULL] core kernel fixes

[Ingo Molnar]

Linus,

Please pull the latest core-urgent-for-linus git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 
core-urgent-for-linus

   # HEAD: 2decec48b0fd28ffdbf4cc684bd04e735f0839dd objtool: Fix whitelist 
documentation typo

A handful of objtool updates, plus a documentation addition for 
__ab_c_size().

 Thanks,

        Ingo

------------------>
Josh Poimboeuf (2):
      objtool: Don't use ignore flag for fake jumps
      objtool: Fix function fallthrough detection

Raphael Gault (1):
      objtool: Fix whitelist documentation typo

Rasmus Villemoes (1):
      overflow.h: Add comment documenting __ab_c_size()


 include/linux/overflow.h                         |  8 ++++++--
 tools/objtool/Documentation/stack-validation.txt |  2 +-
 tools/objtool/check.c                            | 11 +++++++----
 3 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/include/linux/overflow.h b/include/linux/overflow.h
index 40b48e2133cb..6534a727cadb 100644
--- a/include/linux/overflow.h
+++ b/include/linux/overflow.h
@@ -278,11 +278,15 @@ static inline __must_check size_t array3_size(size_t a, 
size_t b, size_t c)
        return bytes;
 }
 
-static inline __must_check size_t __ab_c_size(size_t n, size_t size, size_t c)
+/*
+ * Compute a*b+c, returning SIZE_MAX on overflow. Internal helper for
+ * struct_size() below.
+ */
+static inline __must_check size_t __ab_c_size(size_t a, size_t b, size_t c)
 {
        size_t bytes;
 
-       if (check_mul_overflow(n, size, &bytes))
+       if (check_mul_overflow(a, b, &bytes))
                return SIZE_MAX;
        if (check_add_overflow(bytes, c, &bytes))
                return SIZE_MAX;
diff --git a/tools/objtool/Documentation/stack-validation.txt 
b/tools/objtool/Documentation/stack-validation.txt
index 3995735a878f..cd17ee022072 100644
--- a/tools/objtool/Documentation/stack-validation.txt
+++ b/tools/objtool/Documentation/stack-validation.txt
@@ -306,7 +306,7 @@ ignore it:
 
 - To skip validation of a file, add
 
-    OBJECT_FILES_NON_STANDARD_filename.o := n
+    OBJECT_FILES_NON_STANDARD_filename.o := y
 
   to the Makefile.
 
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index ac743a1d53ab..7325d89ccad9 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -28,6 +28,8 @@
 #include <linux/hashtable.h>
 #include <linux/kernel.h>
 
+#define FAKE_JUMP_OFFSET -1
+
 struct alternative {
        struct list_head list;
        struct instruction *insn;
@@ -568,7 +570,7 @@ static int add_jump_destinations(struct objtool_file *file)
                    insn->type != INSN_JUMP_UNCONDITIONAL)
                        continue;
 
-               if (insn->ignore)
+               if (insn->ignore || insn->offset == FAKE_JUMP_OFFSET)
                        continue;
 
                rela = find_rela_by_dest_range(insn->sec, insn->offset,
@@ -745,10 +747,10 @@ static int handle_group_alt(struct objtool_file *file,
                clear_insn_state(&fake_jump->state);
 
                fake_jump->sec = special_alt->new_sec;
-               fake_jump->offset = -1;
+               fake_jump->offset = FAKE_JUMP_OFFSET;
                fake_jump->type = INSN_JUMP_UNCONDITIONAL;
                fake_jump->jump_dest = list_next_entry(last_orig_insn, list);
-               fake_jump->ignore = true;
+               fake_jump->func = orig_insn->func;
        }
 
        if (!special_alt->new_len) {
@@ -1957,7 +1959,8 @@ static int validate_branch(struct objtool_file *file, 
struct instruction *first,
                        return 1;
                }
 
-               func = insn->func ? insn->func->pfunc : NULL;
+               if (insn->func)
+                       func = insn->func->pfunc;
 
                if (func && insn->ignore) {
                        WARN_FUNC("BUG: why am I validating an ignored 
function?",