linux-kernel - Re: [PATCH v2] nfs: remove incorrect fallthrough label

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Date:   Thu, 17 Sep 2020 06:21:13 +0000
From:   linmiaohe <linmiaohe@...wei.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
CC:     "Gustavo A . R . Silva" <gustavo@...eddedor.com>,
        Joe Perches <joe@...ches.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        "linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "clang-built-linux@...glegroups.com" 
        <clang-built-linux@...glegroups.com>,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <anna.schumaker@...app.com>
Subject: Re: [PATCH v2] nfs: remove incorrect fallthrough label

Nick Desaulniers <ndesaulniers@...gle.com> wrote:
> There is no case after the default from which to fallthrough to. Clang will error in this case (unhelpfully without context, see link below) and GCC will with -Wswitch-unreachable.
>
>The previous commit should have just replaced the comment with a break statement.
>
>If we consider implicit fallthrough to be a design mistake of C, then all case statements should be terminated with one of the following
>statements:
>* break
>* continue
>* return
>* __attribute__(__fallthrough__)
>* goto (plz no)
>* (call of function with __attribute__(__noreturn__))
>
>Fixes: 2a1390c95a69 ("nfs: Convert to use the preferred fallthrough macro")
>Link: https://bugs.llvm.org/show_bug.cgi?id=47539
>Suggested-by: Joe Perches <joe@...ches.com>
>Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
>---

Reviewed-by: Miaohe Lin <linmiaohe@...wei.com>