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ARM: Add smp barriers to mutex fastpath routines

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For smp, barriers are required when a mutex lock is acquired or
released.  Mutex slowpath routines already contain the necessary
barriers.

Change-Id: I774fc6e7bd5b1db9a0f51dee456b71c569cd512e
Signed-off-by: Brent DeGraaf <bdegraaf@codeaurora.org>
(cherry picked from commit 62c6b43d05a6aab278eb7d5d0030bd731b7684ea)
This commit is contained in:
Brent DeGraaf
2011-02-03 15:18:54 -05:00
committed by Stephen Boyd
parent d00d32eb28
commit 94782bc2a8
1 changed files with 8 additions and 0 deletions
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8
arch/arm/include/asm/mutex.h
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@@ -41,6 +41,8 @@ __mutex_fastpath_lock(atomic_t *count, void (*fail_fn)(atomic_t *))
__res |= __ex_flag;
if (unlikely(__res != 0))
fail_fn(count);
else
smp_rmb();
}
static inline int
@@ -61,6 +63,9 @@ __mutex_fastpath_lock_retval(atomic_t *count, int (*fail_fn)(atomic_t *))
__res |= __ex_flag;
if (unlikely(__res != 0))
__res = fail_fn(count);
else
smp_rmb();
return __res;
}
@@ -74,6 +79,7 @@ __mutex_fastpath_unlock(atomic_t *count, void (*fail_fn)(atomic_t *))
{
int __ex_flag, __res, __orig;
smp_wmb();
__asm__ (
"ldrex %0, [%3] \n\t"
@@ -119,6 +125,8 @@ __mutex_fastpath_trylock(atomic_t *count, int (*fail_fn)(atomic_t *))
: "=&r" (__orig), "=&r" (__res), "=&r" (__ex_flag)
: "r" (&count->counter)
: "cc", "memory" );
if (__orig)
smp_rmb();
return __orig;
}