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Date:   Fri, 25 Mar 2022 13:23:36 +0100
From:   Peter Zijlstra <peterz@infradead.org>
To:     Andy Shevchenko <andriy.shevchenko@intel.com>
Cc:     Linus Torvalds <torvalds@linux-foundation.org>,
        Borislav Petkov <bp@alien8.de>, Ingo Molnar <mingo@kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Will Deacon <will@kernel.org>,
        Waiman Long <longman@redhat.com>,
        Boqun Feng <boqun.feng@gmail.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Andrew Morton <akpm@linux-foundation.org>,
        Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Subject: Re: [GIT PULL] locking changes for v5.18
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On Fri, Mar 25, 2022 at 01:41:25PM +0200, Andy Shevchenko wrote:
> On Tue, Mar 22, 2022 at 03:58:47PM -0700, Linus Torvalds wrote:
> > On Tue, Mar 22, 2022 at 3:20 PM Borislav Petkov <bp@alien8.de> wrote:
> > >
> > > Ah, you say build error because you have CONFIG_WERROR=y.
> > 
> > EVERYBODY should have CONFIG_WERROR=y on at least x86-64 and other
> > serious architectures, unless you have some completely random
> > experimental (and broken) compiler.
> > 
> > New compiler warnings are not acceptable.
> 
> What about old one? I have already complained in the early discussion that
> `make W=1 ...` is broken by this change. Enabling it without fixing
> _existing_ warnings on W=1 is not suitable for somebody. Now, I have to
> modify my configs to disable WERROR because of inability to built at all.
> 
> (Yes, I understand that I may drop W=1, but that's not the point. since I
>  want to have clean builds of a new code on level 1 of warnings)

It would be fairly easy to make scripts/Makefile.extrawarn strip out
-Werror when W= is used.