[PATCH 3/9] readahead: remove one unnecessary radix tree lookup

[Wu Fengguang]

(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@xxxxxxxxxxx>
Signed-off-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>
---
 mm/readahead.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- mm.orig/mm/readahead.c
+++ mm/mm/readahead.c
@@ -395,7 +395,7 @@ ondemand_readahead(struct address_space 
 		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)

-- 

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