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From: Jens Axboe <>
To: linux-mm <>
Cc: Andrew Morton <>,
	Christoph Hellwig <>
Subject: [PATCH] mm: fix polled swap page in
Date: Wed, 5 Dec 2018 06:49:08 -0700
Message-ID: <> (raw)

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.

Signed-off-by: Jens Axboe <>


diff --git a/mm/page_io.c b/mm/page_io.c
index 5bdfd21c1bd9..f3455f9f8dc7 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -401,6 +401,8 @@ int swap_readpage(struct page *page, bool synchronous)
 	bio->bi_private = current;
 	bio_set_op_attrs(bio, REQ_OP_READ, 0);
+	if (synchronous)
+		bio->bi_opf |= REQ_HIPRI;
 	qc = submit_bio(bio);
@@ -411,7 +413,7 @@ int swap_readpage(struct page *page, bool synchronous)
 		if (!blk_poll(disk->queue, qc, true))
-			break;
+			io_schedule();

Jens Axboe

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