When we do not get any migrate page, we should return ISOLATE_NONE. If we return ISOLATE_SUCCESS in this case, we may migrate the NORMAL zone's pages to DMA zone. Signed-off-by: Huang Shijie <b32955@xxxxxxxxxxxxx> --- mm/compaction.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/mm/compaction.c b/mm/compaction.c index 0f12cc9..3db8630 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -376,7 +376,7 @@ static isolate_migrate_t isolate_migratepages(struct zone *zone, trace_mm_compaction_isolate_migratepages(nr_scanned, nr_isolated); - return ISOLATE_SUCCESS; + return (cc->nr_migratepages == 0) ? ISOLATE_NONE : ISOLATE_SUCCESS; } /* -- 1.7.3.2 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>