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>

1 files changed, 2 insertions, 1 deletions

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 7658fd6536dd..33c332bbab73 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2946,7 +2946,8 @@ out:
                                 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 */