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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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2
arch/sh/include/asm/spinlock.h
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@@ -26,7 +26,7 @@
#define __raw_spin_is_locked(x) ((x)->lock <= 0)
#define __raw_spin_lock_flags(lock, flags) __raw_spin_lock(lock)
#define __raw_spin_unlock_wait(x) \
do { cpu_relax(); } while ((x)->lock)
do { while (__raw_spin_is_locked(x)) cpu_relax(); } while (0)
/*
* Simple spin lock operations. There are two variants, one clears IRQ's