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Subject[PATCH] writeback: initialize global_dirty_limit
This prevents global_dirty_limit from remaining 0 (the initial value)
for long time, since it's only updated in update_dirty_limit() when
above the dirty freerun area.

It will avoid unexpected consequences when some random code use it as a
convenient approximation of the global dirty threshold.

Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
---
mm/page-writeback.c | 1 +
1 file changed, 1 insertion(+)

--- linux-next.orig/mm/page-writeback.c 2012-04-25 20:16:12.766859391 +0800
+++ linux-next/mm/page-writeback.c 2012-05-03 11:44:32.746272930 +0800
@@ -1568,6 +1568,7 @@ void writeback_set_ratelimit(void)
unsigned long background_thresh;
unsigned long dirty_thresh;
global_dirty_limits(&background_thresh, &dirty_thresh);
+ global_dirty_limit = dirty_thresh;
ratelimit_pages = dirty_thresh / (num_online_cpus() * 32);
if (ratelimit_pages < 16)
ratelimit_pages = 16;

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