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virtio_blk: don't bounce highmem requests

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By default a block driver bounces highmem requests, but virtio-blk is
perfectly fine with any request that fit into it's 64 bit addressing scheme,
mapped in the kernel virtual space or not.

Besides improving performance on highmem systems this also makes the
reproducible oops in __bounce_end_io go away (but hiding the real cause).

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Christoph Hellwig 2009-07-17 21:47:45 -06:00 committed by Rusty Russell
parent 7a5049205f
commit 4eff3cae9c
1 changed files with 3 additions and 0 deletions
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3
drivers/block/virtio_blk.c
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@ -360,6 +360,9 @@ static int __devinit virtblk_probe(struct virtio_device *vdev)
blk_queue_max_phys_segments(vblk->disk->queue, vblk->sg_elems-2);
blk_queue_max_hw_segments(vblk->disk->queue, vblk->sg_elems-2);
/* No need to bounce any requests */
blk_queue_bounce_limit(vblk->disk->queue, BLK_BOUNCE_ANY);
/* No real sector limit. */
blk_queue_max_sectors(vblk->disk->queue, -1U);