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| author | Lars Ellenberg <lars.ellenberg@linbit.com> | 2011-02-21 13:20:55 +0100 |
|---|---|---|
| committer | Philipp Reisner <philipp.reisner@linbit.com> | 2011-10-14 16:47:42 +0200 |
| commit | 4738fa16907a933d72bbcae1b8922dc9330fde92 (patch) | |
| tree | d0a48980a5269758ba01545b4200c548b30b0909 /lib/lru_cache.c | |
| parent | 61610420f764acb835af4a450251dbab2ab6d621 (diff) | |
| download | lwn-4738fa16907a933d72bbcae1b8922dc9330fde92.tar.gz lwn-4738fa16907a933d72bbcae1b8922dc9330fde92.zip | |
drbd: use clear_bit_unlock() where appropriate
Some open-coded clear_bit(); smp_mb__after_clear_bit();
should in fact have been smp_mb__before_clear_bit(); clear_bit();
Instead, use clear_bit_unlock() to annotate the intention,
and have it do the right thing.
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Diffstat (limited to 'lib/lru_cache.c')
| -rw-r--r-- | lib/lru_cache.c | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/lib/lru_cache.c b/lib/lru_cache.c index a07e7268d7ed..9f353f7f41ca 100644 --- a/lib/lru_cache.c +++ b/lib/lru_cache.c @@ -44,8 +44,8 @@ MODULE_LICENSE("GPL"); } while (0) #define RETURN(x...) do { \ - clear_bit(__LC_PARANOIA, &lc->flags); \ - smp_mb__after_clear_bit(); return x ; } while (0) + clear_bit_unlock(__LC_PARANOIA, &lc->flags); \ + return x ; } while (0) /* BUG() if e is not one of the elements tracked by lc */ #define PARANOIA_LC_ELEMENT(lc, e) do { \ @@ -438,8 +438,7 @@ void lc_changed(struct lru_cache *lc, struct lc_element *e) hlist_add_head(&e->colision, lc_hash_slot(lc, lc->new_number)); lc->changing_element = NULL; lc->new_number = LC_FREE; - clear_bit(__LC_DIRTY, &lc->flags); - smp_mb__after_clear_bit(); + clear_bit_unlock(__LC_DIRTY, &lc->flags); RETURN(); } @@ -463,8 +462,7 @@ unsigned int lc_put(struct lru_cache *lc, struct lc_element *e) /* move it to the front of LRU. */ list_move(&e->list, &lc->lru); lc->used--; - clear_bit(__LC_STARVING, &lc->flags); - smp_mb__after_clear_bit(); + clear_bit_unlock(__LC_STARVING, &lc->flags); } RETURN(e->refcnt); } |