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author | Ingo Molnar <mingo@kernel.org> | 2014-07-18 06:16:06 +0200 |
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committer | Ingo Molnar <mingo@kernel.org> | 2014-07-18 06:16:06 +0200 |
commit | ec6dbcb7ade2a616675cbe3185cf299ee1615c9f (patch) | |
tree | 4953f7eca477e011aa9e16cdb236220ed9cec4be /tools/perf/config/feature-checks/test-sync-compare-and-swap.c | |
parent | ff2ebe46e15bd49d52b9c2f3fc77f3a9d94eac7b (diff) | |
parent | 0b437860818dc717f6a9e8a5089223a8414f5fff (diff) | |
download | op-kernel-dev-ec6dbcb7ade2a616675cbe3185cf299ee1615c9f.zip op-kernel-dev-ec6dbcb7ade2a616675cbe3185cf299ee1615c9f.tar.gz |
Merge tag 'perf-core-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core
Pull perf/core improvements and fixes from Arnaldo Carvalho de Melo:
User visible changes:
o Support S/390 in 'perf kvm stat' (Alexander Yarygin)
Developer Stuff:
o Various fixes and prep work related to supporting Intel PT (Adrian Hunter)
o Introduce multiple debug variables control (Jiri Olsa)
o Add callchain and additional sample information for python scripts (Joseph Schuchart)
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'tools/perf/config/feature-checks/test-sync-compare-and-swap.c')
-rw-r--r-- | tools/perf/config/feature-checks/test-sync-compare-and-swap.c | 14 |
1 files changed, 14 insertions, 0 deletions
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 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; +} |