[PATCH v3 07/10] perf: Cleanup for HAVE_SYNC_COMPARE_AND_SWAP_SUPPORT

[Leo Yan]

Since the __sync functions have been dropped, This patch removes unused
build and checking for HAVE_SYNC_COMPARE_AND_SWAP_SUPPORT in perf tool.

Note, there have a test for SYNC_COMPARE_AND_SWAP and the test file is
located in build/feature/test-sync-compare-and-swap.c.  Since there
still has several components using the sync functions, it's deliberately
to not be removed.

  $ cd linux/tools
  $ git grep __sync_val_compare_and_swap | awk '{ printf $1"\n" }'
  build/feature/test-sync-compare-and-swap.c:
  include/asm-generic/atomic-gcc.h:
  testing/selftests/bpf/progs/atomics.c:
  testing/selftests/bpf/progs/atomics.c:
  testing/selftests/bpf/progs/atomics.c:
  testing/selftests/bpf/progs/atomics.c:
  testing/selftests/futex/include/atomic.h:
  testing/selftests/futex/include/futextest.h:

Signed-off-by: Leo Yan <leo.yan at linaro.org>
---
 tools/perf/Makefile.config | 4 ----
 tools/perf/util/auxtrace.c | 5 -----
 2 files changed, 9 deletions(-)

diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index eb8e487ef90b..4a0d9a6defc7 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -349,10 +349,6 @@ CXXFLAGS += $(INC_FLAGS)
 
 LIBPERF_CFLAGS := $(CORE_CFLAGS) $(EXTRA_CFLAGS)
 
-ifeq ($(feature-sync-compare-and-swap), 1)
-  CFLAGS += -DHAVE_SYNC_COMPARE_AND_SWAP_SUPPORT
-endif
-
 ifeq ($(feature-pthread-attr-setaffinity-np), 1)
   CFLAGS += -DHAVE_PTHREAD_ATTR_SETAFFINITY_NP
 endif
diff --git a/tools/perf/util/auxtrace.c b/tools/perf/util/auxtrace.c
index 44bd04dbb6d6..db6255b55c90 100644
--- a/tools/perf/util/auxtrace.c
+++ b/tools/perf/util/auxtrace.c
@@ -130,11 +130,6 @@ int auxtrace_mmap__mmap(struct auxtrace_mmap *mm,
 		return 0;
 	}
 
-#if BITS_PER_LONG != 64 && !defined(HAVE_SYNC_COMPARE_AND_SWAP_SUPPORT)
-	pr_err("Cannot use AUX area tracing mmaps\n");
-	return -1;
-#endif
-
 	pc->aux_offset = mp->offset;
 	pc->aux_size = mp->len;
 
-- 
2.25.1