linux-kernel - Re: [GIT PULL] locking changes for v5.18

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Date:   Fri, 25 Mar 2022 15:06:12 +0200
From:   Andy Shevchenko <andriy.shevchenko@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: Re: [GIT PULL] locking changes for v5.18

On Fri, Mar 25, 2022 at 01:23:36PM +0100, Peter Zijlstra wrote:
> 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@...en8.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.

Hmm... I can't achieve this, because it complains about recursive variable.
What helped me is to supply in such case -Wno-error which seems overrode
the previous setting.

I'll send a patch to discuss further if needed.

-- 
With Best Regards,
Andy Shevchenko