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>
--- linux-2.6.19-rc5-mm2.orig/mm/readahead.c
+++ linux-2.6.19-rc5-mm2/mm/readahead.c
@@ -143,7 +143,7 @@ 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)

--
-
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