diff --git a/[refs] b/[refs]
index ceb6440a3278..80f324aeaf5c 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 652ea695364142b2464744746beac206d050ef19
+refs/heads/master: 30002ed2e41830ec03ec3e577ad83ac6b188f96e
diff --git a/trunk/mm/readahead.c b/trunk/mm/readahead.c
index d8723a5f6496..77e8ddf945e9 100644
--- a/trunk/mm/readahead.c
+++ b/trunk/mm/readahead.c
@@ -382,9 +382,9 @@ ondemand_readahead(struct address_space *mapping,
 	if (hit_readahead_marker) {
 		pgoff_t start;
 
-		read_lock_irq(&mapping->tree_lock);
-		start = radix_tree_next_hole(&mapping->page_tree, offset, max+1);
-		read_unlock_irq(&mapping->tree_lock);
+		rcu_read_lock();
+		start = radix_tree_next_hole(&mapping->page_tree, offset,max+1);
+		rcu_read_unlock();
 
 		if (!start || start - offset > max)
 			return 0;