From 0f190a7ab78878f9e6c6930fc0f5f92c1250b57d Mon Sep 17 00:00:00 2001 From: Xianting Tian <xianting_tian@126.com> Date: Thu, 6 Aug 2020 23:20:17 -0700 Subject: [PATCH] mm/page_io.c: use blk_io_schedule() for avoiding task hung in sync io swap_readpage() does the sync io for one page, the io is not big, normally, the io can be finished quickly, but it may take long time or wait forever in case of io failure or discard. This patch uses blk_io_schedule() instead of io_schedule() to avoid task hung and crash (when set /proc/sys/kernel/hung_task_panic) when the above exception occurs. This is similar to the hung task avoidance in submit_bio_wait(), blk_execute_rq() and __blkdev_direct_IO(). Signed-off-by: Xianting Tian <xianting_tian@126.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Cc: Ming Lei <ming.lei@redhat.com> Cc: Bart Van Assche <bvanassche@acm.org> Cc: Hannes Reinecke <hare@suse.de> Cc: Jens Axboe <axboe@kernel.dk> Cc: Hugh Dickins <hughd@google.com> Link: http://lkml.kernel.org/r/1596461807-21087-1-git-send-email-xianting_tian@126.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> --- mm/page_io.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/page_io.c b/mm/page_io.c index ccda7679008851..9e362567d454cd 100644 --- a/mm/page_io.c +++ b/mm/page_io.c @@ -441,7 +441,7 @@ int swap_readpage(struct page *page, bool synchronous) break; if (!blk_poll(disk->queue, qc, true)) - io_schedule(); + blk_io_schedule(); } __set_current_state(TASK_RUNNING); bio_put(bio); -- GitLab