readahead: remove one unnecessary radix tree lookup

(hit_readahead_marker != 0) means the page at @offset is present, so we
can search for non-present page starting from @offset+1.

Reported-by: Xu Chenfeng <xcf@ustc.edu.cn>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Cc: Ying Han <yinghan@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/mm/readahead.c b/mm/readahead.c
index bd0f0e88b0a1..56731158309b 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -395,7 +395,7 @@ ondemand_readahead(struct address_space *mapping,
                 pgoff_t start;
 
                 rcu_read_lock();
-                start = radix_tree_next_hole(&mapping->page_tree, offset,max+1);
+                start = radix_tree_next_hole(&mapping->page_tree, offset+1,max);
                 rcu_read_unlock();
 
                 if (!start || start - offset > max)