perf tools: Add feature test for __sync_val_compare_and_swap

Add a feature test for __sync_val_compare_and_swap() and
__sync_bool_compare_and_swap()

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1405332185-4050-30-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
index b7f42d5..1f67aa0 100644 (file)
--- a/tools/perf/config/Makefile
+++ b/tools/perf/config/Makefile
@@ -164,6 +164,7 @@ CORE_FEATURE_TESTS =                        \
        backtrace                       \
        dwarf                           \
        fortify-source                  \
+       sync-compare-and-swap           \
        glibc                           \
        gtk2                            \
        gtk2-infobar                    \
@@ -199,6 +200,7 @@ LIB_FEATURE_TESTS =                 \
 VF_FEATURE_TESTS =                     \
        backtrace                       \
        fortify-source                  \
+       sync-compare-and-swap           \
        gtk2-infobar                    \
        libelf-getphdrnum               \
        libelf-mmap                     \
@@ -272,6 +274,10 @@ CFLAGS += -I$(LIB_INCLUDE)
 
 CFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE
 
+ifeq ($(feature-sync-compare-and-swap), 1)
+  CFLAGS += -DHAVE_SYNC_COMPARE_AND_SWAP_SUPPORT
+endif
+
 ifndef NO_BIONIC
   $(call feature_check,bionic)
   ifeq ($(feature-bionic), 1)

diff --git a/tools/perf/config/feature-checks/Makefile b/tools/perf/config/feature-checks/Makefile
index 64c84e5..6088f8d 100644 (file)
--- a/tools/perf/config/feature-checks/Makefile
+++ b/tools/perf/config/feature-checks/Makefile
@@ -5,6 +5,7 @@ FILES=                                  \
        test-bionic.bin                 \
        test-dwarf.bin                  \
        test-fortify-source.bin         \
+       test-sync-compare-and-swap.bin  \
        test-glibc.bin                  \
        test-gtk2.bin                   \
        test-gtk2-infobar.bin           \
@@ -141,6 +142,9 @@ test-timerfd.bin:
 test-libdw-dwarf-unwind.bin:
        $(BUILD)
 
+test-sync-compare-and-swap.bin:
+       $(BUILD) -Werror
+
 -include *.d
 
 ###############################

diff --git a/tools/perf/config/feature-checks/test-all.c b/tools/perf/config/feature-checks/test-all.c
index fe5c1e5..a7d022e 100644 (file)
--- a/tools/perf/config/feature-checks/test-all.c
+++ b/tools/perf/config/feature-checks/test-all.c
@@ -89,6 +89,10 @@
 # include "test-libdw-dwarf-unwind.c"
 #undef main
 
+#define main main_test_sync_compare_and_swap
+# include "test-sync-compare-and-swap.c"
+#undef main
+
 int main(int argc, char *argv[])
 {
        main_test_libpython();
@@ -111,6 +115,7 @@ int main(int argc, char *argv[])
        main_test_timerfd();
        main_test_stackprotector_all();
        main_test_libdw_dwarf_unwind();
+       main_test_sync_compare_and_swap(argc, argv);
 
        return 0;
 }

diff --git a/tools/perf/config/feature-checks/test-sync-compare-and-swap.c b/tools/perf/config/feature-checks/test-sync-compare-and-swap.c
new file mode 100644 (file)
index 0000000..c34d4ca
--- /dev/null
+++ b/tools/perf/config/feature-checks/test-sync-compare-and-swap.c
@@ -0,0 +1,14 @@
+#include <stdint.h>
+
+volatile uint64_t x;
+
+int main(int argc, char *argv[])
+{
+       uint64_t old, new = argc;
+
+       argv = argv;
+       do {
+               old = __sync_val_compare_and_swap(&x, 0, 0);
+       } while (!__sync_bool_compare_and_swap(&x, old, new));
+       return old == new;
+}