From: Tzafrir Cohen <nvidia@cohens.org.il>
Subject: kernel: Explicit fallthrough

diff --git a/kernel/mst_main.c b/kernel/mst_main.c
index 06d6f89..fc4a4a0 100644
--- a/kernel/mst_main.c
+++ b/kernel/mst_main.c
@@ -212,10 +212,13 @@ enum {
     switch (*address_space) {
     case AS_ICMD_EXT:
         *address_space = AS_PCI_ICMD;
+        fallthrough;
 
     case AS_ND_CRSPACE:
+        fallthrough;
     case AS_CR_SPACE:
         *address_space = AS_PCI_CRSPACE;
+        fallthrough;
 
     case AS_ICMD:
         *address_space = AS_PCI_ALL_ICMD;