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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>
This commit is contained in:
Rik van Riel 2012-03-24 10:26:21 -04:00 committed by Linus Torvalds
parent 250f6715a4
commit 496b919b3b
1 changed files with 2 additions and 1 deletions
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3
mm/vmscan.c
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@ -2946,7 +2946,8 @@ out:
continue; continue;
/* Would compaction fail due to lack of free memory? */ /* 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; goto loop_again;
/* Confirm the zone is balanced for order-0 */ /* Confirm the zone is balanced for order-0 */