mm: readahead scan lockless

[mv-sheeva.git] / mm / readahead.c

diff --git a/mm/readahead.c b/mm/readahead.c
index d8723a5f6496d05af23445e6ae862754e9d41214..77e8ddf945e9a725d4b675923124f4eafd0924e2 100644 (file)
--- a/mm/readahead.c
+++ b/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;