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authorArnaldo Carvalho de Melo <acme@redhat.com>2017-02-23 15:33:02 -0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2017-03-03 19:07:14 -0300
commited4aad50ea0384737034b39f952f29cfb2da52ac (patch)
tree1603e24ea3afad82d27138c65b3d8ece9e9497f1 /tools/include
parent2bcdeadbc094b4f6511aedea1e5b8052bf0cc89c (diff)
downloadlinux-ed4aad50ea0384737034b39f952f29cfb2da52ac.tar.bz2
tools include: Provide gcc based cmpxchg fallback for !x86
We've been using an atomic_t implementation subset based on the gcc builtin functions for a while, now, with refcount.h we need cmpxchg(), use gcc's __sync_val_compare_and_swap() for that. 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: Peter Zijlstra <peterz@infradead.org> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/n/tip-b9zovyxgpa0c4vi3nm0kjo97@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/include')
-rw-r--r--tools/include/asm-generic/atomic-gcc.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/tools/include/asm-generic/atomic-gcc.h b/tools/include/asm-generic/atomic-gcc.h
index 2ba78c9f5701..5e9738f97bf3 100644
--- a/tools/include/asm-generic/atomic-gcc.h
+++ b/tools/include/asm-generic/atomic-gcc.h
@@ -60,4 +60,12 @@ static inline int atomic_dec_and_test(atomic_t *v)
return __sync_sub_and_fetch(&v->counter, 1) == 0;
}
+#define cmpxchg(ptr, oldval, newval) \
+ __sync_val_compare_and_swap(ptr, oldval, newval)
+
+static inline int atomic_cmpxchg(atomic_t *v, int oldval, int newval)
+{
+ return cmpxchg(&(v)->counter, oldval, newval);
+}
+
#endif /* __TOOLS_ASM_GENERIC_ATOMIC_H */