kdb: kdb_keyboard: mark expected switch fall-throughs

In preparation to enabling -Wimplicit-fallthrough, mark switch cases
where we are expecting to fall through.

Notice that in this particular case, I replaced the code comments with
a proper "fall through" annotation, which is what GCC is expecting
to find.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/kernel/debug/kdb/kdb_keyboard.c b/kernel/debug/kdb/kdb_keyboard.c
index 118527aa60ea..750497b0003a 100644
--- a/kernel/debug/kdb/kdb_keyboard.c
+++ b/kernel/debug/kdb/kdb_keyboard.c
@@ -173,11 +173,11 @@ int kdb_get_kbd_char(void)
         case KT_LATIN:
                 if (isprint(keychar))
                         break;          /* printable characters */
-                /* drop through */
+                /* fall through */
         case KT_SPEC:
                 if (keychar == K_ENTER)
                         break;
-                /* drop through */
+                /* fall through */
         default:
                 return -1;      /* ignore unprintables */
         }