Memory barriers aren't one of my strengths, but this appears correct.
Acked-by: Dave Kleikamp <[email protected]>
On Fri, 2007-10-26 at 12:09 +1000, Nick Piggin wrote:
> Index: linux-2.6/fs/jfs/jfs_metapage.c
> ===================================================================
> --- linux-2.6.orig/fs/jfs/jfs_metapage.c
> +++ linux-2.6/fs/jfs/jfs_metapage.c
> @@ -39,11 +39,12 @@ static struct {
> #endif
>
> #define metapage_locked(mp) test_bit(META_locked, &(mp)->flag)
> -#define trylock_metapage(mp) test_and_set_bit(META_locked,
> &(mp)->flag)
> +#define trylock_metapage(mp) test_and_set_bit_lock(META_locked,
> &(mp)->flag)
>
> static inline void unlock_metapage(struct metapage *mp)
> {
> - clear_bit(META_locked, &mp->flag);
> + clear_bit_unlock(META_locked, &mp->flag);
> + smp_mb__after_clear_bit();
> wake_up(&mp->wait);
> }
>
Thanks,
Shaggy
--
David Kleikamp
IBM Linux Technology Center
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