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bcache: add the missing comments for smp_mb()/smp_wmb()

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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>
This commit is contained in:
Coly Li 2018-08-11 13:20:00 +08:00 • committed by Jens Axboe
parent d0c1b89a40
commit eb2b3d0345
2 changed files with 4 additions and 2 deletions
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4
drivers/md/bcache/closure.h
View file

@ -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) static inline void closure_wake_up(struct closure_waitlist *list)
{ {
/* Memory barrier for the wait list */
smp_mb(); smp_mb();
__closure_wake_up(list); __closure_wake_up(list);
} }

2
drivers/md/bcache/super.c
View file

@ -1136,11 +1136,11 @@ int bch_cached_dev_attach(struct cached_dev *dc, struct cache_set *c,
list_move(&dc->list, &c->cached_devs); list_move(&dc->list, &c->cached_devs);
calc_cached_dev_sectors(c); calc_cached_dev_sectors(c);
smp_wmb();
/* /*
* dc->c must be set before dc->count != 0 - paired with the mb in * dc->c must be set before dc->count != 0 - paired with the mb in
* cached_dev_get() * cached_dev_get()
*/ */
smp_wmb();
refcount_set(&dc->count, 1); refcount_set(&dc->count, 1);
/* Block writeback thread, but spawn it */ /* Block writeback thread, but spawn it */