diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 53d633125e99..c026908b5306 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -7862,31 +7862,24 @@ static void calculate_totalreserve_pages(void)
 static void setup_per_zone_lowmem_reserve(void)
 {
 	struct pglist_data *pgdat;
-	enum zone_type j, idx;
+	enum zone_type i, j;
 
 	for_each_online_pgdat(pgdat) {
-		for (j = 0; j < MAX_NR_ZONES; j++) {
-			struct zone *zone = pgdat->node_zones + j;
-			unsigned long managed_pages = zone_managed_pages(zone);
+		for (i = 0; i < MAX_NR_ZONES - 1; i++) {
+			struct zone *zone = &pgdat->node_zones[i];
+			int ratio = sysctl_lowmem_reserve_ratio[i];
+			bool clear = !ratio || !zone_managed_pages(zone);
+			unsigned long managed_pages = 0;
 
-			zone->lowmem_reserve[j] = 0;
-
-			idx = j;
-			while (idx) {
-				struct zone *lower_zone;
-
-				idx--;
-				lower_zone = pgdat->node_zones + idx;
-
-				if (!sysctl_lowmem_reserve_ratio[idx] ||
-				    !zone_managed_pages(lower_zone)) {
-					lower_zone->lowmem_reserve[j] = 0;
-					continue;
+			for (j = i + 1; j < MAX_NR_ZONES; j++) {
+				if (clear) {
+					zone->lowmem_reserve[j] = 0;
 				} else {
-					lower_zone->lowmem_reserve[j] =
-						managed_pages / sysctl_lowmem_reserve_ratio[idx];
+					struct zone *upper_zone = &pgdat->node_zones[j];
+
+					managed_pages += zone_managed_pages(upper_zone);
+					zone->lowmem_reserve[j] = managed_pages / ratio;
 				}
-				managed_pages += zone_managed_pages(lower_zone);
 			}
 		}
 	}