diff --git a/mm/early_ioremap.c b/mm/early_ioremap.c
index 9bc12e5..ce06b28 100644
--- a/mm/early_ioremap.c
+++ b/mm/early_ioremap.c
@@ -72,12 +72,10 @@ void __init early_ioremap_setup(void)
 {
 	int i;
 
-	for (i = 0; i < FIX_BTMAPS_SLOTS; i++)
-		if (WARN_ON(prev_map[i]))
-			break;
-
-	for (i = 0; i < FIX_BTMAPS_SLOTS; i++)
+	for (i = 0; i < FIX_BTMAPS_SLOTS; i++) {
+		WARN_ON_ONCE(prev_map[i]);
 		slot_virt[i] = __fix_to_virt(FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*i);
+	}
 }
 
 static int __init check_early_ioremap_leak(void)