From: Rusty Russell <rusty@rustcorp.com.au>
Date: Thu, 12 Jan 2012 05:14:43 +0000 (+1030)
Subject: virtio: support unlocked queue kick
X-Git-Tag: v3.3-rc1~85^2~19
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=41f0377f73039ca6fe97a469d1941a89cd9757f1;p=pandora-kernel.git

virtio: support unlocked queue kick

Based on patch by Christoph for virtio_blk speedup:

	Split virtqueue_kick to be able to do the actual notification
	outside the lock protecting the virtqueue.  This patch was
	originally done by Stefan Hajnoczi, but I can't find the
	original one anymore and had to recreated it from memory.
	Pointers to the original or corrections for the commit message
	are welcome.

Stefan's patch was here:

	https://github.com/stefanha/linux/commit/a6d06644e3a58e57a774e77d7dc34c4a5a2e7496
	http://www.spinics.net/lists/linux-virtualization/msg14616.html

Third time's the charm!

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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