linux-kernel - Re: [PATCH net] tcp: Fix -Wc23-extensions in tcp_options

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Message-ID: <CAKwvOd=voKM+kPWa=toFfWDvq2gOw7Q0yyjq7ragxmPS7U5HBQ@mail.gmail.com>
Date:   Fri, 3 Nov 2023 09:57:17 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Nathan Chancellor <nathan@...nel.org>, edumazet@...gle.com,
        davem@...emloft.net, dsahern@...nel.org, kuba@...nel.org,
        pabeni@...hat.com, trix@...hat.com, 0x7f454c46@...il.com,
        fruggeri@...sta.com, noureddine@...sta.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        patches@...ts.linux.dev,
        Thorsten Leemhuis <regressions@...mhuis.info>
Subject: Re: [PATCH net] tcp: Fix -Wc23-extensions in tcp_options_write()

On Fri, Nov 3, 2023 at 1:22 AM Christoph Hellwig <hch@...radead.org> wrote:
>
> On Tue, Oct 31, 2023 at 01:23:35PM -0700, Nathan Chancellor wrote:
> > Clang warns (or errors with CONFIG_WERROR=y) when CONFIG_TCP_AO is set:
> >
> >   net/ipv4/tcp_output.c:663:2: error: label at end of compound statement is a C23 extension [-Werror,-Wc23-extensions]
> >     663 |         }
> >         |         ^
> >   1 error generated.
> >
> > On earlier releases (such as clang-11, the current minimum supported
> > version for building the kernel) that do not support C23, this was a
> > hard error unconditionally:
> >
> >   net/ipv4/tcp_output.c:663:2: error: expected statement
> >           }
> >           ^
> >   1 error generated.
> >
> > Add a semicolon after the label to create an empty statement, which
> > resolves the warning or error for all compilers.
>
> Can you please just split the A0 handlig into a separate helper, which
> shuld make the whole thing a lot cleaner?

Just a note; mainline is currently red over this for us since
1e03d32bea8e spent all of ~3 days in linux-next before getting merged
into mainline.

Whatever the fix is, it would be great to get it into mainline ASAP.

-- 
Thanks,
~Nick Desaulniers