linux-kernel - Re: [PATCH] ASoC: mchp-spdiftx: Fix clang -Wbitfield-constant-conversion

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Message-ID: <YwT0oUjo/lzBDRdH@dev-arch.thelio-3990X>
Date:   Tue, 23 Aug 2022 08:39:13 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Mark Brown <broonie@...nel.org>
Cc:     Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        alsa-devel@...a-project.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        llvm@...ts.linux.dev,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>
Subject: Re: [PATCH] ASoC: mchp-spdiftx: Fix clang
 -Wbitfield-constant-conversion

Hi Mark,

On Mon, Aug 15, 2022 at 05:23:15PM +0100, Mark Brown wrote:
> On Tue, 9 Aug 2022 18:08:09 -0700, Nathan Chancellor wrote:
> > A recent change in clang strengthened its -Wbitfield-constant-conversion
> > to warn when 1 is assigned to a 1-bit signed integer bitfield, as it can
> > only be 0 or -1, not 1:
> > 
> >   sound/soc/atmel/mchp-spdiftx.c:505:20: error: implicit truncation from 'int' to bit-field changes value from 1 to -1 [-Werror,-Wbitfield-constant-conversion]
> >           dev->gclk_enabled = 1;
> >                             ^ ~
> >   1 error generated.
> > 
> > [...]
> 
> Applied to
> 
>    https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next
> 
> Thanks!
> 
> [1/1] ASoC: mchp-spdiftx: Fix clang -Wbitfield-constant-conversion
>       commit: eab9100d9898cbd37882b04415b12156f8942f18

I noticed that this was applied to for-6.1. I know you do not rebase or
change your trees so this request might be rejected based on that alone
but would it be possible to cherry-pick this to for-6.0 so that it can
be applied to Linus's tree quicker? We have had to apply this change to
our CI to keep our builds green in mainline, -tip, and 5.19/5.15 stable
with clang-16 due to -Werror. If not, no worries, I should have made it
clearer that is what I was looking for with the subject prefix.

Cheers,
Nathan