linux-kernel - [PATCH] compat: Mark expected switch fall-throughs

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Date:   Sat, 13 Oct 2018 13:50:48 +0200
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Subject: [PATCH] compat: Mark expected switch fall-throughs

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

Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
---
 include/linux/compat.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/compat.h b/include/linux/compat.h
index d30e4db..06e7747 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -488,8 +488,11 @@ put_compat_sigset(compat_sigset_t __user *compat, const sigset_t *set,
 	compat_sigset_t v;
 	switch (_NSIG_WORDS) {
 	case 4: v.sig[7] = (set->sig[3] >> 32); v.sig[6] = set->sig[3];
+		/* fall through */
 	case 3: v.sig[5] = (set->sig[2] >> 32); v.sig[4] = set->sig[2];
+		/* fall through */
 	case 2: v.sig[3] = (set->sig[1] >> 32); v.sig[2] = set->sig[1];
+		/* fall through */
 	case 1: v.sig[1] = (set->sig[0] >> 32); v.sig[0] = set->sig[0];
 	}
 	return copy_to_user(compat, &v, size) ? -EFAULT : 0;
-- 
2.7.4