linux-kernel - Re: [PATCH] powerpc: platforms: cell: pervasive: fix clang -Wimplicit-fallthrough

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Message-ID: <CAK8P3a2xJJutbwujzh57QqEAgOUwBz5aT78ZFsSam7TfZuQ_Dg@mail.gmail.com>
Date:   Tue, 7 Dec 2021 14:00:40 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Anders Roxell <anders.roxell@...aro.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        llvm@...ts.linux.dev, Naresh Kamboju <naresh.kamboju@...aro.org>
Subject: Re: [PATCH] powerpc: platforms: cell: pervasive: fix clang -Wimplicit-fallthrough

On Tue, Dec 7, 2021 at 12:02 PM Anders Roxell <anders.roxell@...aro.org> wrote:
>
> Clang warns:
>
> arch/powerpc/platforms/cell/pervasive.c:81:2: error: unannotated fall-through between switch labels [-Werror,-Wimplicit-fallthrough]
>         case SRR1_WAKEEE:
>         ^
> arch/powerpc/platforms/cell/pervasive.c:81:2: note: insert 'break;' to avoid fall-through
>         case SRR1_WAKEEE:
>         ^
>         break;
> 1 error generated.
>
> Clang is more pedantic than GCC, which does not warn when failing
> through to a case that is just break or return. Clang's version
> is more in line with the kernel's own stance in deprecated.rst.
> Add athe missing break to silence the warning.
>
> Fixes: 6e83985b0f6e ("powerpc/cbe: Do not process external or decremeter interrupts from sreset")
> Reported-by: Naresh Kamboju <naresh.kamboju@...aro.org>
> Signed-off-by: Anders Roxell <anders.roxell@...aro.org>

Thanks for the fix!

Reviewed-by: Arnd Bergmann <arnd@...db.de>