Commit 46685d1a authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe
Browse files

blk-mq: don't bounce by default 



For historical reasons we default to bouncing highmem pages for all block
queues.  But the blk-mq drivers are easy to audit to ensure that we don't
need this - scsi and mtip32xx set explicit limits and everyone else doesn't
have any particular ones.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 0b0bcacc

block/blk-mq.c

+0 −5
Original line number Diff line number Diff line
@@ -2349,11 +2349,6 @@ struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set, 


	blk_queue_make_request(q, blk_mq_make_request);



	/*

	 * by default assume old behaviour and bounce for any highmem page

	 */

	blk_queue_bounce_limit(q, BLK_BOUNCE_HIGH);



	/*

	 * Do this after blk_queue_make_request() overrides it...

	 */

drivers/block/virtio_blk.c

+0 −3
Original line number Diff line number Diff line
@@ -720,9 +720,6 @@ static int virtblk_probe(struct virtio_device *vdev) 
	/* We can handle whatever the host told us to handle. */

	blk_queue_max_segments(q, vblk->sg_elems-2);



	/* No need to bounce any requests */

	blk_queue_bounce_limit(q, BLK_BOUNCE_ANY);



	/* No real sector limit. */

	blk_queue_max_hw_sectors(q, -1U);

drivers/block/xen-blkfront.c

+0 −3
Original line number Diff line number Diff line
@@ -953,9 +953,6 @@ static void blkif_set_queue_limits(struct blkfront_info *info) 


	/* Make sure buffer addresses are sector-aligned. */

	blk_queue_dma_alignment(rq, 511);



	/* Make sure we don't use bounce buffers. */

	blk_queue_bounce_limit(rq, BLK_BOUNCE_ANY);

}



static int xlvbd_init_blk_queue(struct gendisk *gd, u16 sector_size,

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