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

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Message-ID: <CANn89i+YpJ+y23f=b0uByVJCqh1Rjau44vP-saRD60kFG7J4fw@mail.gmail.com>
Date:   Wed, 1 Nov 2023 05:49:45 +0100
From:   Eric Dumazet <edumazet@...gle.com>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     davem@...emloft.net, dsahern@...nel.org, kuba@...nel.org,
        pabeni@...hat.com, ndesaulniers@...gle.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
Subject: Re: [PATCH net] tcp: Fix -Wc23-extensions in tcp_options_write()

On Tue, Oct 31, 2023 at 9:23 PM Nathan Chancellor <nathan@...nel.org> 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:


Reviewed-by: Eric Dumazet <edumazet@...gle.com>