[PATCH] files: lock-free fd look-up

With the use of RCU in files structure, the look-up of files using fds can now
be lock-free.  The lookup is protected by rcu_read_lock()/rcu_read_unlock().
This patch changes the readers to use lock-free lookup.

Signed-off-by: Maneesh Soni <maneesh@in.ibm.com>
Signed-off-by: Ravikiran Thirumalai <kiran_th@gmail.com>
Signed-off-by: Dipankar Sarma <dipankar@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index acb5a495a902..f40c8221ec1b 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -1652,7 +1652,7 @@ static inline void flush_unauthorized_files(struct files_struct * files)
                                                 continue;
                                         }
                                         if (devnull) {
-                                                atomic_inc(&devnull->f_count);
+                                                rcuref_inc(&devnull->f_count);
                                         } else {
                                                 devnull = dentry_open(dget(selinux_null), mntget(selinuxfs_mount), O_RDWR);
                                                 if (!devnull) {