linux-kernel - Re: [PATCH] sh: kgdb: Mark expected switch fall-throughs

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Date:   Wed, 30 Oct 2019 09:44:10 +0100
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
Cc:     Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>, Will Deacon <will@...nel.org>,
        Douglas Anderson <dianders@...omium.org>,
        Paul Burton <paul.burton@...s.com>,
        Christophe Leroy <christophe.leroy@....fr>,
        linux-sh@...r.kernel.org, linux-kernel@...r.kernel.org,
        joe@...ches.com
Subject: Re: [PATCH] sh: kgdb: Mark expected switch fall-throughs

On Wed, Oct 30, 2019 at 04:17:53PM +0900, Kuninori Morimoto wrote:
> 
> From: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
> 
> Mark switch cases where we are expecting to fall through.
> 
> This patch fixes the following error:
> 
> LINUX/arch/sh/kernel/kgdb.c: In function 'kgdb_arch_handle_exception':
> LINUX/arch/sh/kernel/kgdb.c:267:6: error: this statement may fall through [-Werror=implicit-fallthrough=]
> if (kgdb_hex2long(&ptr, &addr))
> ^
> LINUX/arch/sh/kernel/kgdb.c:269:2: note: here
> case 'D':
> ^~~~
> 
> Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>

Acked-by: Daniel Thompson <daniel.thompson@...aro.org>

Just FYI this is likely to be converted to be the fallthrough
pseudo-keyword shortly after introductionb but IIRC the keyword is only
available in linux-next right now (and the conversion, from Joe Perches,
is script based so it is likely the change will get picked up by the
script without you having to do anything explicit).


Daniel.

> ---
>  arch/sh/kernel/kgdb.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/sh/kernel/kgdb.c b/arch/sh/kernel/kgdb.c
> index 6d61f8c..0d5f3c9 100644
> --- a/arch/sh/kernel/kgdb.c
> +++ b/arch/sh/kernel/kgdb.c
> @@ -266,6 +266,7 @@ int kgdb_arch_handle_exception(int e_vector, int signo, int err_code,
>  		ptr = &remcomInBuffer[1];
>  		if (kgdb_hex2long(&ptr, &addr))
>  			linux_regs->pc = addr;
> +		/* fallthrough */
>  	case 'D':
>  	case 'k':
>  		atomic_set(&kgdb_cpu_doing_single_step, -1);
> -- 
> 2.7.4
>