linux-kernel - Re: [PATCH 18/22] tty: mips_ejtag_fdc: Mark expected switch fall-through

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Date:   Mon, 9 Mar 2020 17:12:40 +0100
From:   Jiri Slaby <jslaby@...e.com>
To:     Sergey.Semin@...kalelectronics.ru,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Paul Burton <paulburton@...nel.org>,
        Ralf Baechle <ralf@...ux-mips.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 18/22] tty: mips_ejtag_fdc: Mark expected switch
 fall-through

On 06. 03. 20, 13:47, Sergey.Semin@...kalelectronics.ru wrote:
> From: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> 
> Mark mips_ejtag_fdc_encode() methods switch-case-4 as expecting to
> fall through.
> 
> This patch fixes the following warning:
> 
> drivers/tty/mips_ejtag_fdc.c: In function ‘mips_ejtag_fdc_encode’:
> drivers/tty/mips_ejtag_fdc.c:245:13: warning: this statement may fall through [-Wimplicit-fallthrough=]
>    word.word &= 0x00ffffff;
>    ~~~~~~~~~~^~~~~~~~~~~~~
> drivers/tty/mips_ejtag_fdc.c:246:2: note: here
>   case 3:
>   ^~~~
> 
> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> Signed-off-by: Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>
> Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
> Cc: Paul Burton <paulburton@...nel.org>
> Cc: Ralf Baechle <ralf@...ux-mips.org>
> ---
>  drivers/tty/mips_ejtag_fdc.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/tty/mips_ejtag_fdc.c b/drivers/tty/mips_ejtag_fdc.c
> index 620d8488b83e..21e76a2ec182 100644
> --- a/drivers/tty/mips_ejtag_fdc.c
> +++ b/drivers/tty/mips_ejtag_fdc.c
> @@ -243,6 +243,7 @@ static struct fdc_word mips_ejtag_fdc_encode(const char **ptrs,
>  		/* Fall back to a 3 byte encoding */
>  		word.bytes = 3;
>  		word.word &= 0x00ffffff;
> +		/* Fall through */

We now have "fallthrough;", so I believe you should use that instead of
comments.

thanks,
-- 
js
suse labs