xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

vhost: add __rcu annotations

Browse Source 
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>
This commit is contained in:
Arnd Bergmann
2010-03-09 19:24:45 +01:00
committed by Paul E. McKenney
parent 65e6bf484c
commit 28457ee69c
3 changed files with 35 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/vhost/vhost.h
View File

@@ -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);
}