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authorZoltan Menyhart <Zoltan.Menyhart@bull.net>2006-01-13 17:25:23 +0100
committerTony Luck <tony.luck@intel.com>2006-01-17 14:04:00 -0800
commit4b16bfbf8f8013fefb49592d030ff87651ab48cb (patch)
treece9150f8ceac6150261f5bc69afdf9d2e95def19 /include/asm-ia64/semaphore.h
parent8d08aed8d7714683b33666cc066e20f957dda01d (diff)
downloadop-kernel-dev-4b16bfbf8f8013fefb49592d030ff87651ab48cb.zip
op-kernel-dev-4b16bfbf8f8013fefb49592d030ff87651ab48cb.tar.gz
[IA64] Fix bug in ia64 specific down() function
Chen, Kenneth W wrote: > The memory order semantics for include/asm-ia64/semaphore.h:down() > doesn't look right. It is using atomic_dec_return, which eventually > translate into ia64_fetch_and_add() that uses release semantics. > Shouldn't it use acquire semantics? Use ia64_fetchadd() instead of atomic_dec_return() Acked-by: Ken Chen <kenneth.w.chen@intel.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'include/asm-ia64/semaphore.h')
-rw-r--r--include/asm-ia64/semaphore.h8
1 files changed, 4 insertions, 4 deletions
diff --git a/include/asm-ia64/semaphore.h b/include/asm-ia64/semaphore.h
index bb89062..f483eeb 100644
--- a/include/asm-ia64/semaphore.h
+++ b/include/asm-ia64/semaphore.h
@@ -61,7 +61,7 @@ static inline void
down (struct semaphore *sem)
{
might_sleep();
- if (atomic_dec_return(&sem->count) < 0)
+ if (ia64_fetchadd(-1, &sem->count.counter, acq) < 1)
__down(sem);
}
@@ -75,7 +75,7 @@ down_interruptible (struct semaphore * sem)
int ret = 0;
might_sleep();
- if (atomic_dec_return(&sem->count) < 0)
+ if (ia64_fetchadd(-1, &sem->count.counter, acq) < 1)
ret = __down_interruptible(sem);
return ret;
}
@@ -85,7 +85,7 @@ down_trylock (struct semaphore *sem)
{
int ret = 0;
- if (atomic_dec_return(&sem->count) < 0)
+ if (ia64_fetchadd(-1, &sem->count.counter, acq) < 1)
ret = __down_trylock(sem);
return ret;
}
@@ -93,7 +93,7 @@ down_trylock (struct semaphore *sem)
static inline void
up (struct semaphore * sem)
{
- if (atomic_inc_return(&sem->count) <= 0)
+ if (ia64_fetchadd(1, &sem->count.counter, rel) <= -1)
__up(sem);
}
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