fs: Substitute rcu_access_pointer() for rcu_dereference_raw()

(Trivial patch.)

If the code is looking at the RCU-protected pointer itself, but not
dereferencing it, the rcu_dereference() functions can be downgraded to
rcu_access_pointer().  This commit makes this downgrade in __alloc_fd(),
which simply compares the RCU-protected pointer against NULL with no
dereferencing.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: linux-fsdevel@vger.kernel.org
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

diff --git a/fs/file.c b/fs/file.c
index db25c2b..18f7d27 100644 (file)
--- a/fs/file.c
+++ b/fs/file.c
@@ -497,7 +497,7 @@ repeat:
        error = fd;
 #if 1
        /* Sanity check */
-       if (rcu_dereference_raw(fdt->fd[fd]) != NULL) {
+       if (rcu_access_pointer(fdt->fd[fd]) != NULL) {
                printk(KERN_WARNING "alloc_fd: slot %d not NULL!\n", fd);
                rcu_assign_pointer(fdt->fd[fd], NULL);
        }