include/linux/signal.h: mark expected switch fall-throughs

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

Link: http://lkml.kernel.org/r/20181013114847.GA3160@embeddedor.com
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Acked-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Michael Ellerman <mpe@ellerman.id.au>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/signal.h b/include/linux/signal.h
index 200ed96a05afea6b72781960fd11e2f4a0b62217..f428e86f480075fe0c2a8a71938616fdd6ee8dcc 100644 (file)
--- a/include/linux/signal.h
+++ b/include/linux/signal.h
@@ -129,9 +129,11 @@ static inline void name(sigset_t *r, const sigset_t *a, const sigset_t *b) \
                b3 = b->sig[3]; b2 = b->sig[2];                         \
                r->sig[3] = op(a3, b3);                                 \
                r->sig[2] = op(a2, b2);                                 \
+               /* fall through */                                      \
        case 2:                                                         \
                a1 = a->sig[1]; b1 = b->sig[1];                         \
                r->sig[1] = op(a1, b1);                                 \
+               /* fall through */                                      \
        case 1:                                                         \
                a0 = a->sig[0]; b0 = b->sig[0];                         \
                r->sig[0] = op(a0, b0);                                 \
@@ -161,7 +163,9 @@ static inline void name(sigset_t *set)                                      \
        switch (_NSIG_WORDS) {                                          \
        case 4: set->sig[3] = op(set->sig[3]);                          \
                set->sig[2] = op(set->sig[2]);                          \
+               /* fall through */                                      \
        case 2: set->sig[1] = op(set->sig[1]);                          \
+               /* fall through */                                      \
        case 1: set->sig[0] = op(set->sig[0]);                          \
                    break;                                              \
        default:                                                        \
@@ -182,6 +186,7 @@ static inline void sigemptyset(sigset_t *set)
                memset(set, 0, sizeof(sigset_t));
                break;
        case 2: set->sig[1] = 0;
+               /* fall through */
        case 1: set->sig[0] = 0;
                break;
        }
@@ -194,6 +199,7 @@ static inline void sigfillset(sigset_t *set)
                memset(set, -1, sizeof(sigset_t));
                break;
        case 2: set->sig[1] = -1;
+               /* fall through */
        case 1: set->sig[0] = -1;
                break;
        }