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[PATCH] use smp_mb/wmb/rmb where possible

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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>
This commit is contained in:
akpm@osdl.org 2005-05-01 08:58:47 -07:00 • committed by Linus Torvalds
parent 0d8d4d42f2
commit d59dd4620f
11 changed files with 31 additions and 31 deletions
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6
fs/buffer.c
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@ -218,7 +218,7 @@ struct super_block *freeze_bdev(struct block_device *bdev)
sb = get_super(bdev);
if (sb && !(sb->s_flags & MS_RDONLY)) {
sb->s_frozen = SB_FREEZE_WRITE;
wmb();
smp_wmb();
sync_inodes_sb(sb, 0);
DQUOT_SYNC(sb);
@ -235,7 +235,7 @@ struct super_block *freeze_bdev(struct block_device *bdev)
sync_inodes_sb(sb, 1);
sb->s_frozen = SB_FREEZE_TRANS;
wmb();
smp_wmb();
sync_blockdev(sb->s_bdev);
@ -263,7 +263,7 @@ void thaw_bdev(struct block_device *bdev, struct super_block *sb)
if (sb->s_op->unlockfs)
sb->s_op->unlockfs(sb);
sb->s_frozen = SB_UNFROZEN;
wmb();
smp_wmb();
wake_up(&sb->s_wait_unfrozen);
drop_super(sb);
}