From: Maxim Patlasov <MPatlasov@parallels.com>
Date: Wed, 30 Jul 2014 23:08:21 +0000 (-0700)
Subject: mm/page-writeback.c: fix divide by zero in bdi_dirty_limits()
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~210^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f6789593d5cea42a4ecb1cbeab6a23ade5ebbba7;p=pandora-kernel.git

mm/page-writeback.c: fix divide by zero in bdi_dirty_limits()

Under memory pressure, it is possible for dirty_thresh, calculated by
global_dirty_limits() in balance_dirty_pages(), to equal zero.  Then, if
strictlimit is true, bdi_dirty_limits() tries to resolve the proportion:

  bdi_bg_thresh : bdi_thresh = background_thresh : dirty_thresh

by dividing by zero.

Signed-off-by: Maxim Patlasov <mpatlasov@parallels.com>
Acked-by: Rik van Riel <riel@redhat.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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