diff --git a/arch/csky/mm/syscache.c b/arch/csky/mm/syscache.c
index ffade2f9a4c87914af5c8322fdfc1b9600a204c1..4e51d63850c462e75253a43cb657e31894f847ba 100644
--- a/arch/csky/mm/syscache.c
+++ b/arch/csky/mm/syscache.c
@@ -17,6 +17,7 @@ SYSCALL_DEFINE3(cacheflush,
 		flush_icache_mm_range(current->mm,
 				(unsigned long)addr,
 				(unsigned long)addr + bytes);
+		fallthrough;
 	case DCACHE:
 		dcache_wb_range((unsigned long)addr,
 				(unsigned long)addr + bytes);