From 68809c7108b9a75baf2a888b1c19ce1a4680f600 Mon Sep 17 00:00:00 2001
From: Fengguang Wu <fengguang.wu@intel.com>
Date: Sun, 6 May 2012 13:21:42 +0800
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>
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