net: skbuff.h: Mark expected switch fall-throughs

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

Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 119d092..0ba6874 100644 (file)
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -3505,13 +3505,19 @@ static inline bool __skb_metadata_differs(const struct sk_buff *skb_a,
 #define __it(x, op) (x -= sizeof(u##op))
 #define __it_diff(a, b, op) (*(u##op *)__it(a, op)) ^ (*(u##op *)__it(b, op))
        case 32: diffs |= __it_diff(a, b, 64);
+                /* fall through */
        case 24: diffs |= __it_diff(a, b, 64);
+                /* fall through */
        case 16: diffs |= __it_diff(a, b, 64);
+                /* fall through */
        case  8: diffs |= __it_diff(a, b, 64);
                break;
        case 28: diffs |= __it_diff(a, b, 64);
+                /* fall through */
        case 20: diffs |= __it_diff(a, b, 64);
+                /* fall through */
        case 12: diffs |= __it_diff(a, b, 64);
+                /* fall through */
        case  4: diffs |= __it_diff(a, b, 32);
                break;
        }