diff options
| author | akpm@osdl.org <akpm@osdl.org> | 2005-05-01 08:58:47 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-05-01 08:58:47 -0700 |
| commit | d59dd4620fb8d6422555a9e2b82a707718e68327 (patch) | |
| tree | 78205657d24efcaa3f8314064951ac3814ed95a7 /lib/rwsem-spinlock.c | |
| parent | 0d8d4d42f2d00eb65262b49f4edd4cf7ef4eb6fc (diff) | |
| download | lwn-d59dd4620fb8d6422555a9e2b82a707718e68327.tar.gz lwn-d59dd4620fb8d6422555a9e2b82a707718e68327.zip | |
[PATCH] use smp_mb/wmb/rmb where possible
Replace a number of memory barriers with smp_ variants. This means we won't
take the unnecessary hit on UP machines.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'lib/rwsem-spinlock.c')
| -rw-r--r-- | lib/rwsem-spinlock.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/lib/rwsem-spinlock.c b/lib/rwsem-spinlock.c index 21f0db2c9711..40ffde940a86 100644 --- a/lib/rwsem-spinlock.c +++ b/lib/rwsem-spinlock.c @@ -76,7 +76,7 @@ __rwsem_do_wake(struct rw_semaphore *sem, int wakewrite) list_del(&waiter->list); tsk = waiter->task; /* Don't touch waiter after ->task has been NULLed */ - mb(); + smp_mb(); waiter->task = NULL; wake_up_process(tsk); put_task_struct(tsk); @@ -91,7 +91,7 @@ __rwsem_do_wake(struct rw_semaphore *sem, int wakewrite) list_del(&waiter->list); tsk = waiter->task; - mb(); + smp_mb(); waiter->task = NULL; wake_up_process(tsk); put_task_struct(tsk); @@ -123,7 +123,7 @@ __rwsem_wake_one_writer(struct rw_semaphore *sem) list_del(&waiter->list); tsk = waiter->task; - mb(); + smp_mb(); waiter->task = NULL; wake_up_process(tsk); put_task_struct(tsk); |