Commit 496b919b authored Mar 24, 2012 by Rik van Riel Committed by Linus Torvalds Mar 24, 2012

Fix potential endless loop in kswapd when compaction is not enabled



We should only test compaction_suitable if the kernel is built with
CONFIG_COMPACTION, otherwise the stub compaction_suitable function will
always return COMPACT_SKIPPED and send kswapd into an infinite loop.

Reported-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 250f6715

mm/vmscan.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -2946,7 +2946,8 @@ static unsigned long balance_pgdat(pg_data_t *pgdat, int order,
		continue;

		/* Would compaction fail due to lack of free memory? */
		if (compaction_suitable(zone, order) == COMPACT_SKIPPED)
		if (COMPACTION_BUILD &&
		compaction_suitable(zone, order) == COMPACT_SKIPPED)
		goto loop_again;

		/* Confirm the zone is balanced for order-0 */