From: Wu Fengguang <wfg@mail.ustc.edu.cn>

Make possible large readahead values harmless.  The stock readahead is
protected by always consulting the avaiable memory before applying this
number.  Other readahead paths have already did so.

Signed-off-by: Wu Fengguang <wfg@mail.ustc.edu.cn>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 mm/readahead.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN mm/readahead.c~readahead-remove-size-limit-on-read_ahead_kb mm/readahead.c
--- a/mm/readahead.c~readahead-remove-size-limit-on-read_ahead_kb
+++ a/mm/readahead.c
@@ -157,7 +157,7 @@ EXPORT_SYMBOL_GPL(file_ra_state_init);
  */
 static inline unsigned long get_max_readahead(struct file_ra_state *ra)
 {
-	return ra->ra_pages;
+	return max_sane_readahead(ra->ra_pages);
 }
 
 static inline unsigned long get_min_readahead(struct file_ra_state *ra)
_