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| author |   Davidlohr Bueso <dave@stgolabs.net> | 2020-03-22 14:03:04 +0800 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2020-03-22 10:06:57 -0600 |
| commit | b004aa867c48b3232835b61ed9d44b572e29498e (patch) | |
| tree | c4e27aff03ea6deada3f73eb5e36d3715d541908 /drivers/md | |
| parent | bcache: Use scnprintf() for avoiding potential buffer overflow (diff) | |
| download | wireguard-linux-b004aa867c48b3232835b61ed9d44b572e29498e.tar.xz wireguard-linux-b004aa867c48b3232835b61ed9d44b572e29498e.zip | |
bcache: optimize barrier usage for Rmw atomic bitops
We can avoid the unnecessary barrier on non LL/SC architectures,
such as x86. Instead, use the smp_mb__after_atomic().
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Signed-off-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/bcache/writeback.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/md/bcache/writeback.c b/drivers/md/bcache/writeback.c index 6673a37c8bd2..72ba6d015786 100644 --- a/drivers/md/bcache/writeback.c +++ b/drivers/md/bcache/writeback.c @@ -183,7 +183,7 @@ static void update_writeback_rate(struct work_struct *work) */ set_bit(BCACHE_DEV_RATE_DW_RUNNING, &dc->disk.flags); /* paired with where BCACHE_DEV_RATE_DW_RUNNING is tested */ - smp_mb(); + smp_mb__after_atomic(); /* * CACHE_SET_IO_DISABLE might be set via sysfs interface, @@ -193,7 +193,7 @@ static void update_writeback_rate(struct work_struct *work) test_bit(CACHE_SET_IO_DISABLE, &c->flags)) { clear_bit(BCACHE_DEV_RATE_DW_RUNNING, &dc->disk.flags); /* paired with where BCACHE_DEV_RATE_DW_RUNNING is tested */ - smp_mb(); + smp_mb__after_atomic(); return; } @@ -229,7 +229,7 @@ static void update_writeback_rate(struct work_struct *work) */ clear_bit(BCACHE_DEV_RATE_DW_RUNNING, &dc->disk.flags); /* paired with where BCACHE_DEV_RATE_DW_RUNNING is tested */ - smp_mb(); + smp_mb__after_atomic(); } static unsigned int writeback_delay(struct cached_dev *dc, |