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authorMichael S. Tsirkin <mst@redhat.com>2011-03-06 13:33:49 +0200
committerMichael S. Tsirkin <mst@redhat.com>2011-03-08 18:03:05 +0200
commitfcc042a2806064ffcaed7a0c5cb710eca0e99108 (patch)
tree74546d2639c7cb046b7bac0039f4d6f2a71efeda /drivers/vhost
parentd47effe1be0c4fc983306a9c704632e3a087eed8 (diff)
downloadlinux-linaro-stable-fcc042a2806064ffcaed7a0c5cb710eca0e99108.tar.gz
vhost: copy_from_user -> __copy_from_user
copy_from_user is pretty high on perf top profile, replacing it with __copy_from_user helps. It's also safe because we do access_ok checks during setup. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/vhost')
-rw-r--r--drivers/vhost/vhost.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index b0cc7f8ca4de..2ab291241635 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -1171,7 +1171,7 @@ int vhost_get_vq_desc(struct vhost_dev *dev, struct vhost_virtqueue *vq,
i, vq->num, head);
return -EINVAL;
}
- ret = copy_from_user(&desc, vq->desc + i, sizeof desc);
+ ret = __copy_from_user(&desc, vq->desc + i, sizeof desc);
if (unlikely(ret)) {
vq_err(vq, "Failed to get descriptor: idx %d addr %p\n",
i, vq->desc + i);