Bug#695182: [PATCH] MAX_PAUSE to be at least 4

[paul.szabo@sydney.edu.au]

Ensure MAX_PAUSE is 4 or larger, so limits in
	return clamp_val(t, 4, MAX_PAUSE);
(the only use of it) are not back-to-front.

(This patch does not solve the PAE OOM issue.)

Paul Szabo   psz@maths.usyd.edu.au   http://www.maths.usyd.edu.au/u/psz/
School of Mathematics and Statistics   University of Sydney    Australia

Reported-by: Paul Szabo <psz@maths.usyd.edu.au>
Reference: http://bugs.debian.org/695182
Signed-off-by: Paul Szabo <psz@maths.usyd.edu.au>

--- mm/page-writeback.c.old	2012-12-06 22:20:40.000000000 +1100
+++ mm/page-writeback.c	2013-01-21 13:57:05.000000000 +1100
@@ -39,7 +39,7 @@
 /*
  * Sleep at most 200ms at a time in balance_dirty_pages().
  */
-#define MAX_PAUSE		max(HZ/5, 1)
+#define MAX_PAUSE		max(HZ/5, 4)
 
 /*
  * Estimate write bandwidth at 200ms intervals.