From: Adrian Bunk <bunk@stusta.de>

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Cc: Wu Fengguang <wfg@mail.ustc.edu.cn>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

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

diff -puN mm/readahead.c~readahead-events-accounting-make-readahead_debug_level-static mm/readahead.c
--- a/mm/readahead.c~readahead-events-accounting-make-readahead_debug_level-static
+++ a/mm/readahead.c
@@ -68,7 +68,7 @@ enum ra_event {
 };
 
 #ifdef CONFIG_DEBUG_READAHEAD
-u32 readahead_debug_level = 1;
+static u32 readahead_debug_level = 1;
 static u32 disable_stateful_method;
 static const char * const ra_class_name[];
 static void ra_account(struct file_ra_state *ra, enum ra_event e, int pages);
_