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>

diff --git a/drivers/block/drbd/drbd_bitmap.c b/drivers/block/drbd/drbd_bitmap.c
index e8d652f..4be7370 100644 (file)
--- a/drivers/block/drbd/drbd_bitmap.c
+++ b/drivers/block/drbd/drbd_bitmap.c
@@ -219,8 +219,7 @@ static void bm_page_unlock_io(struct drbd_conf *mdev, int page_nr)
 {
        struct drbd_bitmap *b = mdev->bitmap;
        void *addr = &page_private(b->bm_pages[page_nr]);
-       clear_bit(BM_PAGE_IO_LOCK, addr);
-       smp_mb__after_clear_bit();
+       clear_bit_unlock(BM_PAGE_IO_LOCK, addr);
        wake_up(&mdev->bitmap->bm_io_wait);
 }
 

diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 592f0c9..c77e51a 100644 (file)
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -2818,8 +2818,7 @@ static int w_bitmap_io(struct drbd_work *w, int unused)
                put_ldev(mdev);
        }
 
-       clear_bit(BITMAP_IO, &mdev->flags);
-       smp_mb__after_clear_bit();
+       clear_bit_unlock(BITMAP_IO, &mdev->flags);
        wake_up(&mdev->misc_wait);
 
        if (work->done)

diff --git a/include/linux/lru_cache.h b/include/linux/lru_cache.h
index 7a71ffa..4cceafb 100644 (file)
--- a/include/linux/lru_cache.h
+++ b/include/linux/lru_cache.h
@@ -275,8 +275,7 @@ static inline int lc_try_lock(struct lru_cache *lc)
  */
 static inline void lc_unlock(struct lru_cache *lc)
 {
-       clear_bit(__LC_DIRTY, &lc->flags);
-       smp_mb__after_clear_bit();
+       clear_bit_unlock(__LC_DIRTY, &lc->flags);
 }
 
 static inline int lc_is_used(struct lru_cache *lc, unsigned int enr)

diff --git a/lib/lru_cache.c b/lib/lru_cache.c
index a07e726..9f353f7 100644 (file)
--- 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);
 }