mm/page-writeback.c: make a function static

task_dirty_limit() can become static.

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 3d3848f..8137482 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -219,7 +219,7 @@
  *
  *   dirty -= (dirty/8) * p_{t}
  */
-void task_dirty_limit(struct task_struct *tsk, long *pdirty)
+static void task_dirty_limit(struct task_struct *tsk, long *pdirty)
 {
 	long numerator, denominator;
 	long dirty = *pdirty;