Commit e310718d authored by Ingo Molnar's avatar Ingo Molnar

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% )

[ Includes fix to config/feature-checks/Makefile from Will Deacon. ]
Tested-by: default avatarWill Deacon <will.deacon@arm.com>
Tested-by: default avatarJean Pihet <jean.pihet@linaro.org>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/n/tip-scsoctqzmou3rpkixCHezy9e@git.kernel.orgSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent bb4c5500
......@@ -329,8 +329,14 @@ 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)
$(call feature_check,libunwind-debug-frame)
ifneq ($(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
......
......@@ -76,6 +76,9 @@ test-libnuma:
test-libunwind:
$(BUILD) $(LIBUNWIND_LIBS) -lelf
test-libunwind-debug-frame:
$(BUILD) $(LIBUNWIND_LIBS) -lelf
test-libaudit:
$(BUILD) -laudit
......
......@@ -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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