linux-kernel - Re: [PATCH] arm64/neon: Disable -Wincompatible-pointer-types when building with Clang

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Date:   Fri, 15 Feb 2019 20:45:52 +0100
From:   Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Will Deacon <will.deacon@....com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Mark Brown <broonie@...nel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Kevin Hilman <khilman@...libre.com>,
        Sandeep Patil <sspatil@...gle.com>,
        Greg KH <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] arm64/neon: Disable -Wincompatible-pointer-types when
 building with Clang

On Fri, 15 Feb 2019 at 20:43, Nick Desaulniers <ndesaulniers@...gle.com> wrote:
>
> On Fri, Feb 15, 2019 at 11:28 AM Ard Biesheuvel
> <ard.biesheuvel@...aro.org> wrote:
> >
> > On Fri, 15 Feb 2019 at 20:25, Nick Desaulniers <ndesaulniers@...gle.com> wrote:
> > >
> > > On Fri, Feb 15, 2019 at 11:20 AM Ard Biesheuvel
> > > <ard.biesheuvel@...aro.org> wrote:
> > > > Provided that we stop sending Clang enablement patches to -stable:
> > >
> > > What does that mean?  We're trying to provide clang support back to
> > > 4.4 LTS branches. (so 4.4, 4.9, 4.14, 4.19).
> >
> > I understand that is what you are attempting, but that does not mean
> > it /belongs/ in -stable.
> >
> > There are rules for stable, and people that track stable kernels (such
> > as the distros) should be able to rely on us to only backport bug
> > fixes, not linker script changes and other updates that fix issues
> > that did not exist when those kernels were released.
> >
> > It is unclear to me how these clang changes benefit those users.
>
> If you're referring to
> https://www.spinics.net/lists/stable/msg278381.html, that's fair (I
> think those were helpful for LLD support on arm64).
>
> Why didn't you speak up then?  Why is this coming up now?

That is just one example, and I failed to realise it at the time.

I think the Clang/LLVM work you are doing is very important, but I
simply don't think any of it belongs in -stable kernels.