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authorArnd Bergmann <arnd@relay.de.ibm.com>2010-03-09 19:24:45 +0100
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2010-08-21 16:27:36 -0700
commit28457ee69c473a903e51e26c7bcd6f1e9eceb93e (patch)
tree7f872922577ec45ce655d68770c95082ad858a45 /drivers/vhost/vhost.h
parent65e6bf484c497f02d47a0faae69ee398cd59cfda (diff)
vhost: add __rcu annotations
Also add rcu_dereference_protected() for code paths where locks are held. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: "Michael S. Tsirkin" <mst@redhat.com>
Diffstat (limited to 'drivers/vhost/vhost.h')
-rw-r--r--drivers/vhost/vhost.h10
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
index afd77295971..af3c11ded5f 100644
--- a/drivers/vhost/vhost.h
+++ b/drivers/vhost/vhost.h
@@ -106,7 +106,7 @@ struct vhost_virtqueue {
* vhost_work execution acts instead of rcu_read_lock() and the end of
* vhost_work execution acts instead of rcu_read_lock().
* Writers use virtqueue mutex. */
- void *private_data;
+ void __rcu *private_data;
/* Log write descriptors */
void __user *log_base;
struct vhost_log log[VHOST_NET_MAX_SG];
@@ -116,7 +116,7 @@ struct vhost_dev {
/* Readers use RCU to access memory table pointer
* log base pointer and features.
* Writers use mutex below.*/
- struct vhost_memory *memory;
+ struct vhost_memory __rcu *memory;
struct mm_struct *mm;
struct mutex mutex;
unsigned acked_features;
@@ -173,7 +173,11 @@ enum {
static inline int vhost_has_feature(struct vhost_dev *dev, int bit)
{
- unsigned acked_features = rcu_dereference(dev->acked_features);
+ unsigned acked_features;
+
+ acked_features =
+ rcu_dereference_index_check(dev->acked_features,
+ lockdep_is_held(&dev->mutex));
return acked_features & (1 << bit);
}