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authorAsias He <asias@redhat.com>2013-05-07 14:54:36 +0800
committerMichael S. Tsirkin <mst@redhat.com>2013-07-11 15:38:40 +0300
commit22fa90c7fb479694d6affebc049d21f06b714be6 (patch)
treefd62ad11e27171f38d29470e5935736d835d3a4c /drivers/vhost/vhost.h
parente7802212ea4bbbd5db99181942a19ab36ca4b914 (diff)
downloadtalos-obmc-linux-22fa90c7fb479694d6affebc049d21f06b714be6.tar.gz
talos-obmc-linux-22fa90c7fb479694d6affebc049d21f06b714be6.zip
vhost: Remove custom vhost rcu usage
Now, vq->private_data is always accessed under vq mutex. No need to play the vhost rcu trick. Signed-off-by: Asias He <asias@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/vhost/vhost.h')
-rw-r--r--drivers/vhost/vhost.h10
1 files changed, 2 insertions, 8 deletions
diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
index 42298cd23c73..4465ed5f316d 100644
--- a/drivers/vhost/vhost.h
+++ b/drivers/vhost/vhost.h
@@ -103,14 +103,8 @@ struct vhost_virtqueue {
struct iovec iov[UIO_MAXIOV];
struct iovec *indirect;
struct vring_used_elem *heads;
- /* We use a kind of RCU to access private pointer.
- * All readers access it from worker, which makes it possible to
- * flush the vhost_work instead of synchronize_rcu. Therefore readers do
- * not need to call rcu_read_lock/rcu_read_unlock: the beginning of
- * vhost_work execution acts instead of rcu_read_lock() and the end of
- * vhost_work execution acts instead of rcu_read_unlock().
- * Writers use virtqueue mutex. */
- void __rcu *private_data;
+ /* Protected by virtqueue mutex. */
+ void *private_data;
/* Log write descriptors */
void __user *log_base;
struct vhost_log *log;
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