diff options
| author | akpm@osdl.org <akpm@osdl.org> | 2005-05-01 11:58:47 -0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-05-01 11:58:47 -0400 |
| commit | d59dd4620fb8d6422555a9e2b82a707718e68327 (patch) | |
| tree | 78205657d24efcaa3f8314064951ac3814ed95a7 /lib/rwsem.c | |
| parent | 0d8d4d42f2d00eb65262b49f4edd4cf7ef4eb6fc (diff) | |
[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.c')
| -rw-r--r-- | lib/rwsem.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/lib/rwsem.c b/lib/rwsem.c index 7644089ec8fa..62fa4eba9ffe 100644 --- a/lib/rwsem.c +++ b/lib/rwsem.c | |||
| @@ -74,7 +74,7 @@ __rwsem_do_wake(struct rw_semaphore *sem, int downgrading) | |||
| 74 | */ | 74 | */ |
| 75 | list_del(&waiter->list); | 75 | list_del(&waiter->list); |
| 76 | tsk = waiter->task; | 76 | tsk = waiter->task; |
| 77 | mb(); | 77 | smp_mb(); |
| 78 | waiter->task = NULL; | 78 | waiter->task = NULL; |
| 79 | wake_up_process(tsk); | 79 | wake_up_process(tsk); |
| 80 | put_task_struct(tsk); | 80 | put_task_struct(tsk); |
| @@ -117,7 +117,7 @@ __rwsem_do_wake(struct rw_semaphore *sem, int downgrading) | |||
| 117 | waiter = list_entry(next, struct rwsem_waiter, list); | 117 | waiter = list_entry(next, struct rwsem_waiter, list); |
| 118 | next = waiter->list.next; | 118 | next = waiter->list.next; |
| 119 | tsk = waiter->task; | 119 | tsk = waiter->task; |
| 120 | mb(); | 120 | smp_mb(); |
| 121 | waiter->task = NULL; | 121 | waiter->task = NULL; |
| 122 | wake_up_process(tsk); | 122 | wake_up_process(tsk); |
| 123 | put_task_struct(tsk); | 123 | put_task_struct(tsk); |