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| author |   Arnaldo Carvalho de Melo <acme@redhat.com> | 2017-02-22 16:55:43 -0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2017-03-03 19:07:13 -0300 |
| commit | 8a73615df3b8973df2de1455c00e9169522d8257 (patch) | |
| tree | 1920f5e43fda4eac0c8769ae5fb483057113116e /tools/arch | |
| parent | tools arch x86: Include asm/cmpxchg.h (diff) | |
| download | linux-dev-8a73615df3b8973df2de1455c00e9169522d8257.tar.xz linux-dev-8a73615df3b8973df2de1455c00e9169522d8257.zip | |
tools arch x86: Introduce atomic_cmpxchg()
Will be used by atomic_cmpxchg_relaxed(), in turn used by refcount.h.
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Elena Reshetova <elena.reshetova@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-kdmovd3l4gw5b1w31ypr6ddv@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/arch')
| -rw-r--r-- | tools/arch/x86/include/asm/atomic.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/tools/arch/x86/include/asm/atomic.h b/tools/arch/x86/include/asm/atomic.h index 059e33e94260..328eeceec709 100644 --- a/tools/arch/x86/include/asm/atomic.h +++ b/tools/arch/x86/include/asm/atomic.h @@ -7,6 +7,8 @@ #define LOCK_PREFIX "\n\tlock; " +#include <asm/cmpxchg.h> + /* * Atomic operations that C can't guarantee us. Useful for * resource counting etc.. @@ -62,4 +64,9 @@ static inline int atomic_dec_and_test(atomic_t *v) GEN_UNARY_RMWcc(LOCK_PREFIX "decl", v->counter, "%0", "e"); } +static __always_inline int atomic_cmpxchg(atomic_t *v, int old, int new) +{ + return cmpxchg(&v->counter, old, new); +} + #endif /* _TOOLS_LINUX_ASM_X86_ATOMIC_H */ |