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Date:   Thu, 5 Apr 2018 18:11:25 -0500
From:   "Gustavo A. R. Silva" <>
To:     Stephen Boyd <>,
        Chanwoo Choi <>,
        Krzysztof Kozlowski <>,
        Kukjin Kim <>,
        Michael Turquette <>,
        Sylwester Nawrocki <>,
        Tomasz Figa <>
Subject: Re: [PATCH] clk: samsung: s3c: Mark expected switch fall-through

On 04/05/2018 03:24 PM, Stephen Boyd wrote:
> Quoting Gustavo A. R. Silva (2018-04-03 18:09:31)
>> In preparation to enabling -Wimplicit-fallthrough, mark switch cases
>> where we are expecting to fall through.
>> Notice that in this particular case I replaced the comma wiht a dash,
> s/wiht/with/

Thanks for this.

>> which is what GCC is expecting to find when there are other comments
>> in the same line in which "fall through" appears.
>> Signed-off-by: Gustavo A. R. Silva <>
>> ---
>> This code was compiled with GCC 7.3.0
> What's the GCC warning? Please include in the commit text.

drivers/clk/samsung/clk-s3c2443.c:430:3: warning: this statement may 
fall through [-Wimplicit-fallthrough=]
    samsung_clk_register_alias(ctx, s3c2450_aliases,
drivers/clk/samsung/clk-s3c2443.c:433:2: note: here
   case S3C2416:

> Also what's the implicit-fallthrough level you're using? 3? Can you file
> a bug so GCC can update their regex to accept a comma in addition to
> whitespace characters?

Yeah, I can talk to the GCC guys about that.

> And maybe we can change the level to 2 or 1 in the kernel's makefile so
> we don't need to patch comments for this.

Yeah, with level 2 I don't get that warning.


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