diff --git a/mm/compaction.c b/mm/compaction.c index 71a58f67f4817720a4eca34678b2353fa96863e6..bd939a574b841d51d704af6a70a5ba7e37dc4e71 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -313,6 +313,19 @@ static isolate_migrate_t isolate_migratepages(struct zone *zone, } else if (!locked) spin_lock_irq(&zone->lru_lock); + /* + * migrate_pfn does not necessarily start aligned to a + * pageblock. Ensure that pfn_valid is called when moving + * into a new MAX_ORDER_NR_PAGES range in case of large + * memory holes within the zone + */ + if ((low_pfn & (MAX_ORDER_NR_PAGES - 1)) == 0) { + if (!pfn_valid(low_pfn)) { + low_pfn += MAX_ORDER_NR_PAGES - 1; + continue; + } + } + if (!pfn_valid_within(low_pfn)) continue; nr_scanned++;