From: Namhyung Kim
For building perf without libunwind, we can set NO_LIBUNWIND=1 as a
argument of make. It then defines NO_LIBUNWIND_SUPPORT macro for C
code to do the proper handling. However it usually used in a negative
semantics - e.g. #ifndef - so we saw double negations which can be
misleading. Convert it to a positive form to make it more readable.
Also change NO_PERF_REGS macro to HAVE_PERF_REGS for the same reason.
Cc: Jiri Olsa
Signed-off-by: Namhyung Kim
---
tools/perf/Makefile | 8 +++-
tools/perf/builtin-record.c | 14 +++---
tools/perf/util/perf_regs.h | 4 ++--
tools/perf/util/unwind.h| 4 ++--
4 files changed, 14 insertions(+), 16 deletions(-)
diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 1df09175d8d4..676302441e14 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -535,9 +535,8 @@ endif # PERF_HAVE_DWARF_REGS
endif # NO_DWARF
endif # NO_LIBELF
-ifdef NO_LIBUNWIND
- BASIC_CFLAGS += -DNO_LIBUNWIND_SUPPORT
-else
+ifndef NO_LIBUNWIND
+ BASIC_CFLAGS += -DLIBUNWIND_SUPPORT
EXTLIBS += $(LIBUNWIND_LIBS)
BASIC_CFLAGS := $(LIBUNWIND_CFLAGS) $(BASIC_CFLAGS)
BASIC_LDFLAGS := $(LIBUNWIND_LDFLAGS) $(BASIC_LDFLAGS)
@@ -747,8 +746,7 @@ ifeq ($(NO_PERF_REGS),0)
ifeq ($(ARCH),x86)
LIB_H += arch/x86/include/perf_regs.h
endif
-else
- BASIC_CFLAGS += -DNO_PERF_REGS
+ BASIC_CFLAGS += -DHAVE_PERF_REGS
endif
ifdef NO_STRLCPY
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index f14cb5fdb91f..8c029fe2e22c 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -33,11 +33,11 @@
#define CALLCHAIN_HELP "do call-graph (stack chain/backtrace) recording: "
-#ifdef NO_LIBUNWIND_SUPPORT
-static char callchain_help[] = CALLCHAIN_HELP "[fp]";
-#else
+#ifdef LIBUNWIND_SUPPORT
static unsigned long default_stack_dump_size = 8192;
static char callchain_help[] = CALLCHAIN_HELP "[fp] dwarf";
+#else
+static char callchain_help[] = CALLCHAIN_HELP "[fp]";
#endif
enum write_mode_t {
@@ -800,7 +800,7 @@ error:
return ret;
}
-#ifndef NO_LIBUNWIND_SUPPORT
+#ifdef LIBUNWIND_SUPPORT
static int get_stack_size(char *str, unsigned long *_size)
{
char *endptr;
@@ -826,7 +826,7 @@ static int get_stack_size(char *str, unsigned long *_size)
max_size, str);
return -1;
}
-#endif /* !NO_LIBUNWIND_SUPPORT */
+#endif /* LIBUNWIND_SUPPORT */
static int
parse_callchain_opt(const struct option *opt __maybe_unused, const char *arg,
@@ -865,7 +865,7 @@ parse_callchain_opt(const struct option *opt
__maybe_unused, const char *arg,
"needed for -g fp\n");
break;
-#ifndef NO_LIBUNWIND_SUPPORT
+#ifdef LIBUNWIND_SUPPORT
/* Dwarf style */
} else if (!strncmp(name, "dwarf", sizeof("dwarf"))) {
ret = 0;
@@ -883,7 +883,7 @@ parse_callchain_opt(const struct option *opt
__maybe_unused, const char *arg,
if (!ret)
pr_debug("callchain: stack dump size %d\n",
rec->opts.stack_dump_size);
-#endif /* !NO_LIBUNWIND_SUPPORT */
+#endif /* LIBUNWIND_SUPPORT */
} else {
pr_err("callchain: Unknown -g option "
"value: %s\n", arg);
diff --git a/tools/perf/util/perf_regs.h b/tools/perf/util/perf_regs.h
index 316dbe7f86ed..5a4f2b6f3738 100644
--- a/tools/perf/util/perf_regs.h
+++ b/tools/perf/util/perf_regs.h
@@ -1,7 +1,7 @@
#ifndef __PERF_REGS_H
#define __PERF_REGS_H
-#ifndef NO_PERF_REGS
+#ifdef HAVE_PERF_REGS
#include
#else
#define PERF_REGS_MASK 0
@@ -10,5 +10,5 @@ static inline const char *perf_reg_name(int id __maybe_unused)
{
return NULL;
}
-#endif /* NO_PERF_REGS */
+#endif /* HAVE_PERF_REGS */
#endif /* __PERF_REGS_H */
diff --git a/tools/perf/util/unwind.h b/tools/perf/util/unwind.h
index a78c8b303bb5..cb6bc503a792 100644
--- a/tools/perf/util/unwind.h
+++ b/tools/perf/util/unwind.h
@@ -13,7 +13,7 @@ struct unwind_entry {
typedef int (*unwind_entry_cb_t)(struct unwind_entry *entry, void *arg);
-#ifndef NO_LIBUNWIND_SUPPORT
+#ifdef LIBUNWIND_SUPPORT
int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
struct machine *machine,
struct thread *thread,
@@ -31,5 +31,5 @@ unwind__get_entries(unwind_entry_cb_t cb __maybe_unused,
{
return 0;
}
-#endif /* NO_LIBUNWIND_SUPPORT */
+#endif /* LIBUNWIND_SUPPORT */
#endif /* __UNWIND_H */
--
1.7.11.4
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