Commit f6789593 authored Jul 30, 2014 by Maxim Patlasov Committed by Linus Torvalds Jul 30, 2014

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>

parent 26bcd8b7

mm/page-writeback.c

+3 −3

Original line number	Diff line number	Diff line
		@@ -1306,9 +1306,9 @@ static inline void bdi_dirty_limits(struct backing_dev_info *bdi,
		*bdi_thresh = bdi_dirty_limit(bdi, dirty_thresh);

		if (bdi_bg_thresh)
		bdi_bg_thresh = div_u64((u64)bdi_thresh *
		bdi_bg_thresh = dirty_thresh ? div_u64((u64)bdi_thresh *
		background_thresh,
		dirty_thresh);
		dirty_thresh) : 0;

		/*
		* In order to avoid the stacked BDI deadlock we need