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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: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2017-06-19 09:26:24 +02:00 committed by Jens Axboe
parent 0b0bcacc3b
commit 46685d1a95
3 changed files with 0 additions and 11 deletions
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5
block/blk-mq.c
View File

@ -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...
*/

3
drivers/block/virtio_blk.c
View File

@ -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);

3
drivers/block/xen-blkfront.c
View File

@ -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,