diff options
| author | Coly Li <colyli@suse.de> | 2018-08-11 13:20:00 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-08-11 15:46:42 -0600 |
| commit | eb2b3d034511f7f5f5fa781b9354ea4d5dbd4fc5 (patch) | |
| tree | ad0d16a069090d085913618d74c928ef828417bc /drivers/md | |
| parent | d0c1b89a409fb8f55783e95effeb60d703f81061 (diff) | |
| download | linux-eb2b3d034511f7f5f5fa781b9354ea4d5dbd4fc5.tar.bz2 | |
bcache: add the missing comments for smp_mb()/smp_wmb()
Checkpatch.pl warns there are 2 locations of smp_mb() and smp_wmb()
without code comment. This patch adds the missing code comments for
these memory barrier calls.
Signed-off-by: Coly Li <colyli@suse.de>
Reviewed-by: Shenghui Wang <shhuiw@foxmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/bcache/closure.h | 4 | ||||
| -rw-r--r-- | drivers/md/bcache/super.c | 2 |
2 files changed, 4 insertions, 2 deletions
diff --git a/drivers/md/bcache/closure.h b/drivers/md/bcache/closure.h index 7f3594c0be14..eca0d496b686 100644 --- a/drivers/md/bcache/closure.h +++ b/drivers/md/bcache/closure.h @@ -289,10 +289,12 @@ static inline void closure_init_stack(struct closure *cl) } /** - * closure_wake_up - wake up all closures on a wait list. + * closure_wake_up - wake up all closures on a wait list, + * with memory barrier */ static inline void closure_wake_up(struct closure_waitlist *list) { + /* Memory barrier for the wait list */ smp_mb(); __closure_wake_up(list); } diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c index e637d74e2908..94c756c66bd7 100644 --- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -1136,11 +1136,11 @@ int bch_cached_dev_attach(struct cached_dev *dc, struct cache_set *c, list_move(&dc->list, &c->cached_devs); calc_cached_dev_sectors(c); - smp_wmb(); /* * dc->c must be set before dc->count != 0 - paired with the mb in * cached_dev_get() */ + smp_wmb(); refcount_set(&dc->count, 1); /* Block writeback thread, but spawn it */ |