diff --git a/arch/s390/boot/vmem.c b/arch/s390/boot/vmem.c
index 8476b6f965a9..145035f84a0e 100644
--- a/arch/s390/boot/vmem.c
+++ b/arch/s390/boot/vmem.c
@@ -264,17 +264,7 @@ static unsigned long _pa(unsigned long addr, unsigned long size, enum populate_m
 
 static bool large_allowed(enum populate_mode mode)
 {
-	switch (mode) {
-	case POPULATE_DIRECT:
-	case POPULATE_IDENTITY:
-	case POPULATE_KERNEL:
-#ifdef CONFIG_KASAN
-	case POPULATE_KASAN_MAP_SHADOW:
-#endif
-		return true;
-	default:
-		return false;
-	}
+	return (mode == POPULATE_DIRECT) || (mode == POPULATE_IDENTITY) || (mode == POPULATE_KERNEL);
 }
 
 static bool can_large_pud(pud_t *pu_dir, unsigned long addr, unsigned long end,