linux-kernel - Re: [PATCH] cpufreq: s3c244x: add fallthrough comments for switch

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Message-ID: <20211004061328.nmvjuyloitd7bswz@vireshk-i7>
Date:   Mon, 4 Oct 2021 11:43:28 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpufreq: s3c244x: add fallthrough comments for switch

On 27-09-21, 11:51, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> Apparently nobody has so far caught this warning, I hit it in randconfig
> build testing:
> 
> drivers/cpufreq/s3c2440-cpufreq.c: In function 's3c2440_cpufreq_setdivs':
> drivers/cpufreq/s3c2440-cpufreq.c:175:10: error: this statement may fall through [-Werror=implicit-fallthrough=]
>    camdiv |= S3C2440_CAMDIVN_HCLK3_HALF;
>           ^
> drivers/cpufreq/s3c2440-cpufreq.c:176:2: note: here
>   case 3:
>   ^~~~
> drivers/cpufreq/s3c2440-cpufreq.c:181:10: error: this statement may fall through [-Werror=implicit-fallthrough=]
>    camdiv |= S3C2440_CAMDIVN_HCLK4_HALF;
>           ^
> drivers/cpufreq/s3c2440-cpufreq.c:182:2: note: here
>   case 4:
>   ^~~~
> 
> Both look like the fallthrough is intentional, so add the new
> "fallthrough;" keyword.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/cpufreq/s3c2440-cpufreq.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/cpufreq/s3c2440-cpufreq.c b/drivers/cpufreq/s3c2440-cpufreq.c
> index 148e8aedefa9..2011fb9c03a4 100644
> --- a/drivers/cpufreq/s3c2440-cpufreq.c
> +++ b/drivers/cpufreq/s3c2440-cpufreq.c
> @@ -173,12 +173,14 @@ static void s3c2440_cpufreq_setdivs(struct s3c_cpufreq_config *cfg)
>  
>  	case 6:
>  		camdiv |= S3C2440_CAMDIVN_HCLK3_HALF;
> +		fallthrough;
>  	case 3:
>  		clkdiv |= S3C2440_CLKDIVN_HDIVN_3_6;
>  		break;
>  
>  	case 8:
>  		camdiv |= S3C2440_CAMDIVN_HCLK4_HALF;
> +		fallthrough;
>  	case 4:
>  		clkdiv |= S3C2440_CLKDIVN_HDIVN_4_8;
>  		break;

Applied. Thanks.

-- 
viresh