From 0619317ff8baa2da9238191ad5167ed3618c16d9 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Tue, 13 Nov 2018 21:16:54 -0700 Subject: block: add polled wakeup task helper If we're polling for IO on a device that doesn't use interrupts, then IO completion loop (and wake of task) is done by submitting task itself. If that is the case, then we don't need to enter the wake_up_process() function, we can simply mark ourselves as TASK_RUNNING. Reviewed-by: Christoph Hellwig Signed-off-by: Jens Axboe --- fs/block_dev.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'fs/block_dev.c') diff --git a/fs/block_dev.c b/fs/block_dev.c index c039abfb2052..9fe56672cfe5 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -181,7 +181,7 @@ static void blkdev_bio_end_io_simple(struct bio *bio) struct task_struct *waiter = bio->bi_private; WRITE_ONCE(bio->bi_private, NULL); - wake_up_process(waiter); + blk_wake_io_task(waiter); } static ssize_t @@ -305,7 +305,7 @@ static void blkdev_bio_end_io(struct bio *bio) struct task_struct *waiter = dio->waiter; WRITE_ONCE(dio->waiter, NULL); - wake_up_process(waiter); + blk_wake_io_task(waiter); } } -- cgit v1.2.3-55-g7522