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

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Message-ID: <20191211151856.krh7jbrl5vsa7imq@holly.lan>
Date:   Wed, 11 Dec 2019 15:18:56 +0000
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        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
Subject: Re: [PATCH] sh: kgdb: Mark expected switch fall-throughs

On Tue, Dec 10, 2019 at 05:39:00PM +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>
> ---
>  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 */

Since v5.5-rc1 there is the fallthrough pseudo keyword to document
these cases:
https://elixir.bootlin.com/linux/v5.5-rc1/source/Documentation/process/coding-style.rst#L59


Daniel.


>  	case 'D':
>  	case 'k':
>  		atomic_set(&kgdb_cpu_doing_single_step, -1);
> -- 
> 2.7.4
>