linux-kernel - Re: [PATCH 00/13] selftests: Fix problems seen when building with -Werror

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Message-ID: <0b4dd065-4f96-48e8-a44c-24d891c68a68@roeck-us.net>
Date: Thu, 4 Dec 2025 12:07:31 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Kees Cook <kees@...nel.org>
Cc: Jakub Kicinski <kuba@...nel.org>, Shuah Khan <shuah@...nel.org>,
	Christian Brauner <brauner@...nel.org>,
	Elizabeth Figura <zfigura@...eweavers.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Eric Dumazet <edumazet@...gle.com>, linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org, wine-devel@...ehq.org,
	netdev@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH 00/13] selftests: Fix problems seen when building with
 -Werror

On Thu, Dec 04, 2025 at 12:03:29PM -0800, Kees Cook wrote:
> On Thu, Dec 04, 2025 at 09:16:16AM -0800, Guenter Roeck wrote:
> > On Thu, Dec 04, 2025 at 08:27:54AM -0800, Jakub Kicinski wrote:
> > > On Thu,  4 Dec 2025 08:17:14 -0800 Guenter Roeck wrote:
> > > > This series fixes build errors observed when trying to build selftests
> > > > with -Werror.
> > > 
> > > If your intention is to make -Werror the default please stop.
> > > Defaulting WERROR to enabled is one of the silliest things we have done
> > > in recent past.
> > > 
> > 
> > No, that is not the idea, and not the intention.
> > 
> > The Google infrastructure builds the kernel, including selftests, with
> > -Werror enabled. This triggers a number of build errors when trying to
> > build selftests with the 6.18 kernel. That means I have three options:
> > 1) Disable -Werror in selftest builds and accept that some real problems
> >    will slip through. Not really a good option, and not acceptable.
> > 2) Fix the problems in the upstream kernel and backport.
> 
> The series fixes build warnings that appear regardless of -Werror,
> yes? That on its face is an improvement, so maybe just adjust the
> Subject/changelogs?
> 
Yes, I'll do that.

Thanks,
Guenter