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Message-ID: <ZUStrQCqBjBBB6dc@infradead.org>
Date: Fri, 3 Nov 2023 01:22:05 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Nathan Chancellor <nathan@...nel.org>
Cc: edumazet@...gle.com, 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 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?
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