netdev - Re: [PATCH net v3] tcp: Fix -Wc23-extensions in tcp_options

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Date: Tue, 7 Nov 2023 04:44:12 +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, noureddine@...sta.com, hch@...radead.org, 
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org, llvm@...ts.linux.dev, 
	patches@...ts.linux.dev
Subject: Re: [PATCH net v3] tcp: Fix -Wc23-extensions in tcp_options_write()

On Mon, Nov 6, 2023 at 10:14 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:
>
>
> Closes: https://github.com/ClangBuiltLinux/linux/issues/1953
> Fixes: 1e03d32bea8e ("net/tcp: Add TCP-AO sign to outgoing packets")
> Signed-off-by: Nathan Chancellor <nathan@...nel.org>
> ---
> Changes in v3:
> - Don't use a pointer to a pointer for ptr parameter to avoid the extra
>   indirection in process_tcp_ao_options(), just return the modified ptr
>   value back to the caller (Eric)

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