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SubjectRe: [PATCH] signal: Mark expected switch fall-throughs
Date
[ Cc += ebiederm@xmission.com ]

"Gustavo A. R. Silva" <gustavo@embeddedor.com> writes:
> In preparation to enabling -Wimplicit-fallthrough, mark switch cases
> where we are expecting to fall through.
>
> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
> ---
> include/linux/signal.h | 6 ++++++
> 1 file changed, 6 insertions(+)

These all look correct to me.

Reviewed-by: Michael Ellerman <mpe@ellerman.id.au>

> diff --git a/include/linux/signal.h b/include/linux/signal.h
> index 200ed96..f428e86 100644
> --- 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;
> }

I think _NSIG_WORDS is always constant. So these last two seem like they
could just be replaced with memset() and a modern compiler would do the
right thing.

cheers

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