linux-kernel - Re: [PATCH] macintosh/via-pmu: Fix compiler warnings when CONFIG_PROC

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Message-ID: <b6d69a6-9e17-d370-a1cd-8f51204ea5d@linux-m68k.org>
Date:   Mon, 21 Mar 2022 20:11:47 +1100 (AEDT)
From:   Finn Thain <fthain@...ux-m68k.org>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] macintosh/via-pmu: Fix compiler warnings when CONFIG_PROC_FS
 is disabled

On Mon, 21 Mar 2022, Christophe Leroy wrote:

> Le 21/03/2022 à 09:50, Finn Thain a écrit :
> > Hi Christophe,
> > 
> > On Mon, 21 Mar 2022, Finn Thain wrote:
> > 
> >> On Mon, 21 Mar 2022, Christophe Leroy wrote:
> >>
> >>> Le 19/03/2022 à 08:20, Finn Thain a écrit :
> >>>> drivers/macintosh/via-pmu.c:897:12: warning: 'pmu_battery_proc_show' defined but not used [-Wunused-function]
> >>>>    static int pmu_battery_proc_show(struct seq_file *m, void *v)
> >>>>               ^~~~~~~~~~~~~~~~~~~~~
> >>>> drivers/macintosh/via-pmu.c:871:12: warning: 'pmu_irqstats_proc_show' defined but not used [-Wunused-function]
> >>>>    static int pmu_irqstats_proc_show(struct seq_file *m, void *v)
> >>>>               ^~~~~~~~~~~~~~~~~~~~~~
> >>>> drivers/macintosh/via-pmu.c:860:12: warning: 'pmu_info_proc_show' defined but not used [-Wunused-function]
> >>>>    static int pmu_info_proc_show(struct seq_file *m, void *v)
> >>>>               ^~~~~~~~~~~~~~~~~~
> >>>>
> >>>> Rearrange some code and add some #ifdefs to avoid unused code warnings
> >>>> when CONFIG_PROC_FS is disabled.
> >>>
> >>> Why not just put those three functions inside an #ifdef CONFIG_PROC_FS ?
> >>>
> >>
> >> You'd get a warning about the prototypes ("declared static but never
> >> defined"). Rather than add an ifdef around the prototypes as well, I
> >> just reordered things a little.
> > 
> > Oops, I was forgetting that I also added an ifdef around the new
> > prototype.
> > 
> > The simplest solution is probably the patch below, as it better exploits
> > the stubbed-out proc_* API in include/linux/proc_fs.h.
> > 
> > Was this what you had in mind?
> 
> Yes that's exactly what I had in mind.
> 

OK, I'll submit it formally.

Thanks for your review.