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| author | Jens Axboe <axboe@kernel.dk> | 2018-11-16 08:37:34 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-11-19 08:34:49 -0700 |
| commit | 849a370016a5489c49253338507ee6cc4a08df4b (patch) | |
| tree | 3e8794bb4312b0fa73e3092849b8b6e163437a2d /block/blk-mq.c | |
| parent | a4668d9ba4be1ca9f4a39798ba3419fdfef0750d (diff) | |
| download | linux-0-day-849a370016a5489c49253338507ee6cc4a08df4b.tar.gz linux-0-day-849a370016a5489c49253338507ee6cc4a08df4b.tar.xz | |
block: avoid ordered task state change for polled IO
For the core poll helper, the task state setting don't need to imply any
atomics, as it's the current task itself that is being modified and
we're not going to sleep.
For IRQ driven, the wakeup path have the necessary barriers to not need
us using the heavy handed version of the task state setting.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-mq.c')
| -rw-r--r-- | block/blk-mq.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c index 32b246ed44c0a..7fc4abb4cc36e 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -3331,12 +3331,12 @@ static bool __blk_mq_poll(struct blk_mq_hw_ctx *hctx, struct request *rq) ret = q->mq_ops->poll(hctx, rq->tag); if (ret > 0) { hctx->poll_success++; - set_current_state(TASK_RUNNING); + __set_current_state(TASK_RUNNING); return true; } if (signal_pending_state(state, current)) - set_current_state(TASK_RUNNING); + __set_current_state(TASK_RUNNING); if (current->state == TASK_RUNNING) return true; |