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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>
This commit is contained in:
Wu Fengguang 2009-06-16 15:31:21 -07:00 committed by Linus Torvalds
parent fc31d16add
commit caca7cb748
1 changed files with 1 additions and 1 deletions
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2
mm/readahead.c
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@ -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)