From 560cb12a4080a48b84da8b96878cafbd193c4d64 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Wed, 23 Apr 2014 16:12:30 +0200 Subject: locking,arch: Rewrite generic atomic support Rewrite generic atomic support to only require cmpxchg(), generate all other primitives from that. Furthermore reduce the endless repetition for all these primitives to a few CPP macros. This way we get more for less lines. Signed-off-by: Peter Zijlstra Link: http://lkml.kernel.org/r/20140508135852.940119622@infradead.org Cc: Arnd Bergmann Cc: David Howells Cc: Paul E. McKenney Cc: David S. Miller Cc: Linus Torvalds Cc: linux-arch@vger.kernel.org Signed-off-by: Ingo Molnar --- include/asm-generic/atomic64.h | 20 ++++++++++++++++---- 1 file changed, 16 insertions(+), 4 deletions(-) (limited to 'include/asm-generic/atomic64.h') diff --git a/include/asm-generic/atomic64.h b/include/asm-generic/atomic64.h index b18ce4f9ee3d..30ad9c86cebb 100644 --- a/include/asm-generic/atomic64.h +++ b/include/asm-generic/atomic64.h @@ -20,10 +20,22 @@ typedef struct { extern long long atomic64_read(const atomic64_t *v); extern void atomic64_set(atomic64_t *v, long long i); -extern void atomic64_add(long long a, atomic64_t *v); -extern long long atomic64_add_return(long long a, atomic64_t *v); -extern void atomic64_sub(long long a, atomic64_t *v); -extern long long atomic64_sub_return(long long a, atomic64_t *v); + +#define ATOMIC64_OP(op) \ +extern void atomic64_##op(long long a, atomic64_t *v); + +#define ATOMIC64_OP_RETURN(op) \ +extern long long atomic64_##op##_return(long long a, atomic64_t *v); + +#define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_OP_RETURN(op) + +ATOMIC64_OPS(add) +ATOMIC64_OPS(sub) + +#undef ATOMIC64_OPS +#undef ATOMIC64_OP_RETURN +#undef ATOMIC64_OP + extern long long atomic64_dec_if_positive(atomic64_t *v); extern long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n); extern long long atomic64_xchg(atomic64_t *v, long long new); -- cgit v1.2.3