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Date: Thu, 14 Nov 2013 00:18:34 -0800
From: tip-bot for Ingo Molnar <tipbot@...or.com>
To: linux-tip-commits@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
will.deacon@....com, torvalds@...ux-foundation.org,
jean.pihet@...aro.org, rmk@....linux.org.uk, jolsa@...hat.com,
acme@...radead.org, tglx@...utronix.de
Subject: [tip:perf/urgent] tools/perf/build:
Fix feature-libunwind-debug-frame handling
Commit-ID: 12413057fa8b6f2993f573e6e83f843fc86d044c
Gitweb: http://git.kernel.org/tip/12413057fa8b6f2993f573e6e83f843fc86d044c
Author: Ingo Molnar <mingo@...nel.org>
AuthorDate: Thu, 14 Nov 2013 08:25:24 +0100
Committer: Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 14 Nov 2013 08:40:23 +0100
tools/perf/build: Fix feature-libunwind-debug-frame handling
Set feature-libunwind-debug-frame. We don't want it in
CORE_FEATURE_TESTS because it's not the generic case, but we
need to set it in the !feature-libunwind case.
Also, because x86 distributions typically don't have
dwarf_find_debug_frame() unwinding method:
test-libunwind-debug-frame.c:(.text+0x31): undefined reference to `_Ux86_64_dwarf_find_debug_frame'
Restrict this new API to ARM for the time being.
With this patch test-all.c works again, so repeat perf builds
are fast again:
comet:~/tip> perf stat --null --repeat 5 make -C tools/perf/
[...]
0,452899660 seconds time elapsed ( +- 0,11% )
While with before it was:
comet:~/tip> perf stat --null --repeat 5 make -C tools/perf/
[...]
1,674001829 seconds time elapsed ( +- 0,16% )
Cc: Russell King <rmk@....linux.org.uk>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Arnaldo Carvalho de Melo <acme@...radead.org>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Jean Pihet <jean.pihet@...aro.org>
Cc: Will Deacon <will.deacon@....com>
Link: http://lkml.kernel.org/n/tip-scsoctqzmou3rpkixCHezy9e@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
tools/perf/config/Makefile | 10 ++++++++--
tools/perf/config/feature-checks/test-all.c | 4 ----
2 files changed, 8 insertions(+), 6 deletions(-)
diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
index f5905f2..a8abd0e 100644
--- a/tools/perf/config/Makefile
+++ b/tools/perf/config/Makefile
@@ -328,8 +328,14 @@ ifndef NO_LIBUNWIND
msg := $(warning No libunwind found, disabling post unwind support. Please install libunwind-dev[el] >= 1.1);
NO_LIBUNWIND := 1
else
- ifneq ($(feature-libunwind-debug-frame), 1)
- msg := $(warning No debug_frame support found in libunwind);
+ ifeq ($(ARCH),arm)
+ $(call feature_check,feature-libunwind-debug-frame)
+ ifneq ($(feature-libunwind-debug-frame), 1)
+ msg := $(warning No debug_frame support found in libunwind);
+ CFLAGS += -DNO_LIBUNWIND_DEBUG_FRAME
+ endif
+ else
+ # non-ARM has no dwarf_find_debug_frame() function:
CFLAGS += -DNO_LIBUNWIND_DEBUG_FRAME
endif
endif
diff --git a/tools/perf/config/feature-checks/test-all.c b/tools/perf/config/feature-checks/test-all.c
index 799865b..59e7a70 100644
--- a/tools/perf/config/feature-checks/test-all.c
+++ b/tools/perf/config/feature-checks/test-all.c
@@ -49,10 +49,6 @@
# include "test-libunwind.c"
#undef main
-#define main main_test_libunwind_debug_frame
-# include "test-libunwind-debug-frame.c"
-#undef main
-
#define main main_test_libaudit
# include "test-libaudit.c"
#undef main
--
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