Commit-ID: 8a73615df3b8973df2de1455c00e9169522d8257 Gitweb: http://git.kernel.org/tip/8a73615df3b8973df2de1455c00e9169522d8257 Author: Arnaldo Carvalho de Melo <a...@redhat.com> AuthorDate: Wed, 22 Feb 2017 16:55:43 -0300 Committer: Arnaldo Carvalho de Melo <a...@redhat.com> CommitDate: Fri, 3 Mar 2017 19:07:13 -0300
tools arch x86: Introduce atomic_cmpxchg() Will be used by atomic_cmpxchg_relaxed(), in turn used by refcount.h. Cc: Adrian Hunter <adrian.hun...@intel.com> Cc: David Ahern <dsah...@gmail.com> Cc: Elena Reshetova <elena.reshet...@intel.com> Cc: Jiri Olsa <jo...@kernel.org> Cc: Namhyung Kim <namhy...@kernel.org> Cc: Wang Nan <wangn...@huawei.com> Link: http://lkml.kernel.org/n/tip-kdmovd3l4gw5b1w31ypr6...@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com> --- tools/arch/x86/include/asm/atomic.h | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/tools/arch/x86/include/asm/atomic.h b/tools/arch/x86/include/asm/atomic.h index 059e33e..328eece 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 */
