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Date: Thu, 25 Jan 2007 11:15:51 -0500 From: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> To: linux-kernel@...r.kernel.org Cc: Linus Torvalds <torvalds@...l.org>, Andrew Morton <akpm@...l.org>, Ingo Molnar <mingo@...hat.com>, Greg Kroah-Hartman <gregkh@...e.de>, Christoph Hellwig <hch@...radead.org>, ltt-dev@...fik.org, systemtap@...rces.redhat.com, Douglas Niehaus <niehaus@...s.ku.edu>, "Martin J. Bligh" <mbligh@...igh.org>, Thomas Gleixner <tglx@...utronix.de>, Paul Mackerras <paulus@...ba.org>, Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> Subject: [PATCH 06/09] atomic.h : Add atomic64 cmpxchg, xchg and add_unless to parisc atomic.h : Add atomic64 cmpxchg, xchg and add_unless to parisc Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> --- a/include/asm-parisc/atomic.h +++ b/include/asm-parisc/atomic.h @@ -163,7 +163,8 @@ static __inline__ int atomic_read(const atomic_t *v) } /* exported interface */ -#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n))) +#define atomic_cmpxchg(v, o, n) \ + ((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n))) #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) /** @@ -177,7 +178,7 @@ static __inline__ int atomic_read(const atomic_t *v) */ #define atomic_add_unless(v, a, u) \ ({ \ - int c, old; \ + __typeof__((v)->counter) c, old; \ c = atomic_read(v); \ while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \ c = old; \ @@ -270,6 +271,31 @@ atomic64_read(const atomic64_t *v) #define atomic64_dec_and_test(v) (atomic64_dec_return(v) == 0) #define atomic64_sub_and_test(i,v) (atomic64_sub_return((i),(v)) == 0) +/* exported interface */ +#define atomic64_cmpxchg(v, o, n) \ + ((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n))) +#define atomic64_xchg(v, new) (xchg(&((v)->counter), new)) + +/** + * atomic64_add_unless - add unless the number is a given value + * @v: pointer of type atomic64_t + * @a: the amount to add to v... + * @u: ...unless v is equal to u. + * + * Atomically adds @a to @v, so long as it was not @u. + * Returns non-zero if @v was not @u, and zero otherwise. + */ +#define atomic64_add_unless(v, a, u) \ +({ \ + __typeof__((v)->counter) c, old; \ + c = atomic64_read(v); \ + while (c != (u) && (old = atomic64_cmpxchg((v), c, c + (a))) != c) \ + c = old; \ + c != (u); \ +}) +#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) + + #endif /* __LP64__ */ #include <asm-generic/atomic.h> - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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