linux-kernel - Re: [PATCH] clk: samsung: s3c: Mark expected switch fall-through

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Message-ID: <152295987121.91052.16578276622043986934@swboyd.mtv.corp.google.com>
Date:   Thu, 05 Apr 2018 13:24:31 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Kukjin Kim <kgene@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Tomasz Figa <tomasz.figa@...il.com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Subject: Re: [PATCH] clk: samsung: s3c: Mark expected switch fall-through

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/

> 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 <gustavo@...eddedor.com>
> ---
> This code was compiled with GCC 7.3.0

What's the GCC warning? Please include in the commit text.

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?

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.