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sh: Fix sh4a llsc-based cmpxchg()

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This fixes up a typo in the ll/sc based cmpxchg code which apparently
wasn't getting a lot of testing due to the swapped old/new pair. With
that fixed up, the ll/sc code also starts using it and provides its own
atomic_add_unless().

Signed-off-by: Aoi Shinkai <shinkoi2005@gmail.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Aoi Shinkai
2009-06-10 16:15:42 +00:00
committed by Paul Mundt
parent f168dd00a9
commit 4c7c997886
4 changed files with 31 additions and 4 deletions
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4
arch/sh/include/asm/atomic.h
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@@ -45,7 +45,7 @@
#define atomic_inc(v) atomic_add(1,(v))
#define atomic_dec(v) atomic_sub(1,(v))
#ifndef CONFIG_GUSA_RB
#if !defined(CONFIG_GUSA_RB) && !defined(CONFIG_CPU_SH4A)
static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
{
int ret;
@@ -73,7 +73,7 @@ static inline int atomic_add_unless(atomic_t *v, int a, int u)
return ret != u;
}
#endif
#endif /* !CONFIG_GUSA_RB && !CONFIG_CPU_SH4A */
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)