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371706
2014 Jun 28
0
[PATCH 3.15 002/139] block: virtio_blk: dont hold spin lock during world switch
3.15-stable review patch. If anyone has any objections, please let me know.
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From: Ming Lei <ming.lei at canonical.com>
commit e8edca6f7f92234202d6dd163c118ef495244d7c upstream.
Firstly, it isn't necessary to hold lock of vblk->vq_lock
when notifying hypervisor about queued I/O.
Secondly, virtqueue_notify() will cause world switch and
it may take long time on