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atomic: move atomic_add_unless to generic code

Browse source 
This is in preparation for more generic atomic primitives based on
__atomic_add_unless.

Signed-off-by: Arun Sharma <asharma@fb.com>
Signed-off-by: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>
Reviewed-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: David Miller <davem@davemloft.net>
Acked-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Arun Sharma 2011-07-26 16:09:07 -07:00 • committed by Linus Torvalds
commit f24219b4e9
26 changed files with 109 additions and 102 deletions
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4
include/asm-generic/atomic.h
View file

@ -129,13 +129,13 @@ static inline void atomic_dec(atomic_t *v)
#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
static inline int atomic_add_unless(atomic_t *v, int a, int u)
static inline int __atomic_add_unless(atomic_t *v, int a, int u)
{
int c, old;
c = atomic_read(v);
while (c != u && (old = atomic_cmpxchg(v, c, c + a)) != c)
c = old;
return c != u;
return c;
}
static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)

14
include/linux/atomic.h
View file

@ -2,6 +2,20 @@
#define _LINUX_ATOMIC_H
#include <asm/atomic.h>
/**
* atomic_add_unless - add unless the number is already a given value
* @v: pointer of type atomic_t
* @a: the amount to add to v...
* @u: ...unless v is equal to u.
*
* Atomically adds @a to @v, so long as @v was not already @u.
* Returns non-zero if @v was not @u, and zero otherwise.
*/
static inline int atomic_add_unless(atomic_t *v, int a, int u)
{
return __atomic_add_unless(v, a, u) != u;
}
/**
* atomic_inc_not_zero - increment unless the number is zero
* @v: pointer of type atomic_t