netdev - Re: [PATCH 11/20] bpf: factor out a bpf_trace_copy

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Message-ID: <CAHk-=wjcmfe__pphtjGzLMJ2kFN0ZTRZQJQVunRxL+9E2Xki=Q@mail.gmail.com>
Date:   Tue, 19 May 2020 09:36:15 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Christoph Hellwig <hch@....de>
Cc:     "the arch/x86 maintainers" <x86@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-parisc@...r.kernel.org,
        linux-um <linux-um@...ts.infradead.org>,
        Netdev <netdev@...r.kernel.org>, bpf@...r.kernel.org,
        Linux-MM <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 11/20] bpf: factor out a bpf_trace_copy_string helper

On Tue, May 19, 2020 at 9:14 AM Christoph Hellwig <hch@....de> wrote:
>
> I don't think we need it as the case of
>
>         case 'a':
>         case 'b':
>                 do_stuff();
>                 break;
>
> has always been fine even with the fallthough warnings.  And the
> rest of the stuff gets removed by cpp..

You're right. I read it as a fallthrough because as a human it looks
like there's code in there between, but yeah, the compiler won't
actually ever see it.

So scratch that objection.

              Linus