linux-hardening - Re: [PATCH 057/141] watchdog: Fix fall-through warnings for Clang

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Date:   Mon, 17 May 2021 18:54:35 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>
Cc:     linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH 057/141] watchdog: Fix fall-through warnings for Clang

Hi all,

I'm taking this in my -next[1] branch for v5.14.

Thanks
--
Gustavo

[1] https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git/log/?h=for-next/kspp

On 11/20/20 12:32, Gustavo A. R. Silva wrote:
> In preparation to enable -Wimplicit-fallthrough for Clang, fix a warning
> by explicitly adding a fallthrough pseudo-keyword instead of letting the
> code fall through to the next case.
> 
> Link: https://github.com/KSPP/linux/issues/115
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
> ---
>  drivers/watchdog/machzwd.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/watchdog/machzwd.c b/drivers/watchdog/machzwd.c
> index 743377c5b173..73f2221f6222 100644
> --- a/drivers/watchdog/machzwd.c
> +++ b/drivers/watchdog/machzwd.c
> @@ -174,6 +174,7 @@ static inline void zf_set_timer(unsigned short new, unsigned char n)
>  		fallthrough;
>  	case WD2:
>  		zf_writeb(COUNTER_2, new > 0xff ? 0xff : new);
> +		fallthrough;
>  	default:
>  		return;
>  	}
>