diff --git a/mm/compaction.c b/mm/compaction.c
index bbf41ee99142f88468d55a69f8ffbf2952514a46..658c009d60cc4130f722b3bf6798acfe9a8cd891 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -1392,11 +1392,19 @@ static enum compact_result __compaction_suitable(struct zone *zone, int order,
 
 	/*
 	 * Watermarks for order-0 must be met for compaction to be able to
-	 * isolate free pages for migration targets.
+	 * isolate free pages for migration targets. This means that the
+	 * watermark and alloc_flags have to match, or be more pessimistic than
+	 * the check in __isolate_free_page(). We don't use the direct
+	 * compactor's alloc_flags, as they are not relevant for freepage
+	 * isolation. We however do use the direct compactor's classzone_idx to
+	 * skip over zones where lowmem reserves would prevent allocation even
+	 * if compaction succeeds.
+	 * ALLOC_CMA is used, as pages in CMA pageblocks are considered
+	 * suitable migration targets
 	 */
 	watermark = low_wmark_pages(zone) + compact_gap(order);
 	if (!__zone_watermark_ok(zone, 0, watermark, classzone_idx,
-				 alloc_flags, wmark_target))
+						ALLOC_CMA, wmark_target))
 		return COMPACT_SKIPPED;
 
 	/*
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index a2214c64ed3cd04dceaed7a579f593852e458df1..637b0e907df016620b40fbaa6bd5d502b5048e4e 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2491,7 +2491,7 @@ int __isolate_free_page(struct page *page, unsigned int order)
 	if (!is_migrate_isolate(mt)) {
 		/* Obey watermarks as if the page was being allocated */
 		watermark = low_wmark_pages(zone) + (1 << order);
-		if (!zone_watermark_ok(zone, 0, watermark, 0, 0))
+		if (!zone_watermark_ok(zone, 0, watermark, 0, ALLOC_CMA))
 			return 0;
 
 		__mod_zone_freepage_state(zone, -(1UL << order), mt);