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| author | Michael S. Tsirkin <mst@redhat.com> | 2011-03-06 13:33:49 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2011-03-08 18:03:05 +0200 |
| commit | fcc042a2806064ffcaed7a0c5cb710eca0e99108 (patch) | |
| tree | 74546d2639c7cb046b7bac0039f4d6f2a71efeda /drivers/vhost | |
| parent | d47effe1be0c4fc983306a9c704632e3a087eed8 (diff) | |
| download | lwn-fcc042a2806064ffcaed7a0c5cb710eca0e99108.tar.gz lwn-fcc042a2806064ffcaed7a0c5cb710eca0e99108.zip | |
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.c | 2 |
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); |