arch: Mass conversion of smp_mb__*()

Mostly scripted conversion of the smp_mb__* barriers.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/n/tip-55dhyhocezdw1dg7u19hmh1u@git.kernel.org
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-arch@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index e79ff6b..f45040a 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -642,7 +642,7 @@
 		return -EINVAL;
 
 	atomic_inc(&root->will_be_snapshoted);
-	smp_mb__after_atomic_inc();
+	smp_mb__after_atomic();
 	btrfs_wait_nocow_write(root);
 
 	ret = btrfs_start_delalloc_inodes(root, 0);