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authorJens Axboe <axboe@kernel.dk>2019-01-03 15:29:15 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2019-01-04 13:13:48 -0800
commitb685a7350ae76bc0f388e24b36d06a63776c68ee (patch)
tree237770a434c3029f5ba5157de2f8b35176e5649e
parentd499480cc435ff153bf7e2e7ee6ab6ac44306c28 (diff)
downloadlinux-b685a7350ae76bc0f388e24b36d06a63776c68ee.tar.gz
mm/page_io.c: fix polled swap page in
swap_readpage() wants to do polling to bring in pages if asked to, but it doesn't mark the bio as being polled. Additionally, the looping around the blk_poll() check isn't correct - if we get a zero return, we should call io_schedule(), we can't just assume that the bio has completed. The regular bio->bi_private check should be used for that. Link: http://lkml.kernel.org/r/e15243a8-2cdf-c32c-ecee-f289377c8ef9@kernel.dk Signed-off-by: Jens Axboe <axboe@kernel.dk> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/page_io.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/mm/page_io.c b/mm/page_io.c
index d975fa3f02aa..2e8019d0e048 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -401,6 +401,8 @@ int swap_readpage(struct page *page, bool synchronous)
get_task_struct(current);
bio->bi_private = current;
bio_set_op_attrs(bio, REQ_OP_READ, 0);
+ if (synchronous)
+ bio->bi_opf |= REQ_HIPRI;
count_vm_event(PSWPIN);
bio_get(bio);
qc = submit_bio(bio);
@@ -410,7 +412,7 @@ int swap_readpage(struct page *page, bool synchronous)
break;
if (!blk_poll(disk->queue, qc, true))
- break;
+ io_schedule();
}
__set_current_state(TASK_RUNNING);
bio_put(bio);