linux-kernel - Re: mainline build failure due to ace6d1448138 ("mfd: cs42l43: Add support for cs42l43 core driver")

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Date:   Wed, 30 Aug 2023 15:00:37 +0000
From:   Charles Keepax <ckeepax@...nsource.cirrus.com>
To:     Takashi Iwai <tiwai@...e.de>
CC:     "Sudip Mukherjee (Codethink)" <sudipm.mukherjee@...il.com>,
        James Schulman <james.schulman@...rus.com>,
        David Rhodes <david.rhodes@...rus.com>,
        "Richard Fitzgerald" <rf@...nsource.cirrus.com>,
        Lee Jones <lee@...nel.org>, <alsa-devel@...a-project.org>,
        <patches@...nsource.cirrus.com>, <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        <regressions@...ts.linux.dev>
Subject: Re: mainline build failure due to ace6d1448138 ("mfd: cs42l43: Add
 support for cs42l43 core driver")

On Wed, Aug 30, 2023 at 03:09:13PM +0200, Takashi Iwai wrote:
> On Wed, 30 Aug 2023 13:29:57 +0200,
> Sudip Mukherjee (Codethink) wrote:
> > 
> > Hi All,
> > 
> > The latest mainline kernel branch fails to build alpha, csky and s390
> > allmodconfig with the error:
> > 
> > drivers/mfd/cs42l43.c:1138:12: error: 'cs42l43_runtime_resume' defined but not used [-Werror=unused-function]
> >  1138 | static int cs42l43_runtime_resume(struct device *dev)
> >       |            ^~~~~~~~~~~~~~~~~~~~~~
> > drivers/mfd/cs42l43.c:1124:12: error: 'cs42l43_runtime_suspend' defined but not used [-Werror=unused-function]
> >  1124 | static int cs42l43_runtime_suspend(struct device *dev)
> >       |            ^~~~~~~~~~~~~~~~~~~~~~~
> > drivers/mfd/cs42l43.c:1106:12: error: 'cs42l43_resume' defined but not used [-Werror=unused-function]
> >  1106 | static int cs42l43_resume(struct device *dev)
> >       |            ^~~~~~~~~~~~~~
> > drivers/mfd/cs42l43.c:1076:12: error: 'cs42l43_suspend' defined but not used [-Werror=unused-function]
> >  1076 | static int cs42l43_suspend(struct device *dev)
> >       |            ^~~~~~~~~~~~~~~
> > 
> > git bisect pointed to ace6d1448138 ("mfd: cs42l43: Add support for cs42l43 core driver")
> > 
> > I will be happy to test any patch or provide any extra log if needed.
> 
> Adding __maybe_unused for those PM functions should work around it,
> something like below.  Could you check it?
> If it's confirmed to work, I'll submit properly.
> 
> 

This is probably the correct fix:

https://lore.kernel.org/lkml/20230822114914.340359-1-ckeepax@opensource.cirrus.com/

Just waiting on it to be reviewed.

Thanks,
Charles