linux-kernel - Re: [PATCH] clk: samsung: s3c2443: Mark expected switch fall-through

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Date:   Tue, 12 Feb 2019 09:37:49 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Tomasz Figa <tomasz.figa@...il.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH] clk: samsung: s3c2443: Mark expected switch
 fall-through

Hi Gustavo,

On 19. 2. 12. 오전 3:15, Gustavo A. R. Silva wrote:
> In preparation to enabling -Wimplicit-fallthrough, mark switch
> cases where we are expecting to fall through.
> 
> This patch fixes the following warnings:
> 
> drivers/clk/samsung/clk-s3c2443.c: In function ‘s3c2443_common_clk_init’:
> drivers/clk/samsung/clk-s3c2443.c:390:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
>    samsung_clk_register_alias(ctx, s3c2450_aliases,
>    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>      ARRAY_SIZE(s3c2450_aliases));
>      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/clk/samsung/clk-s3c2443.c:393:2: note: here
>   case S3C2416:
>   ^~~~
> 
> Warning level 3 was used: -Wimplicit-fallthrough=3
> 
> Notice that, in this particular case,  the code comment is modified
> in accordance with what GCC is expecting to find.
> 
> This patch is part of the ongoing efforts to enable
> -Wimplicit-fallthrough.

Except for level 5 of -Wimplicit-fallthrough,
level 4 is more strict to show the warnings.
Why don't you support level 4 for -Wimplicit-fallthrough?
I think that you want to fix for -Wimplicit-fallthrough warning,
you better to support level 4. What do you think?


> 
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
> ---
>  drivers/clk/samsung/clk-s3c2443.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/clk/samsung/clk-s3c2443.c b/drivers/clk/samsung/clk-s3c2443.c
> index 884067e4f1a1..f38f0e24e3b6 100644
> --- a/drivers/clk/samsung/clk-s3c2443.c
> +++ b/drivers/clk/samsung/clk-s3c2443.c
> @@ -389,7 +389,7 @@ void __init s3c2443_common_clk_init(struct device_node *np, unsigned long xti_f,
>  				ARRAY_SIZE(s3c2450_gates));
>  		samsung_clk_register_alias(ctx, s3c2450_aliases,
>  				ARRAY_SIZE(s3c2450_aliases));
> -		/* fall through, as s3c2450 extends the s3c2416 clocks */
> +		/* fall through - as s3c2450 extends the s3c2416 clocks */
>  	case S3C2416:
>  		samsung_clk_register_div(ctx, s3c2416_dividers,
>  				ARRAY_SIZE(s3c2416_dividers));
> 


-- 
Best Regards,
Chanwoo Choi
Samsung Electronics