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

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Date:   Mon, 21 Mar 2022 19:50:41 +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

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?

diff --git a/drivers/macintosh/via-pmu.c b/drivers/macintosh/via-pmu.c
index 2109129ea1bb..495fd35b11de 100644
--- a/drivers/macintosh/via-pmu.c
+++ b/drivers/macintosh/via-pmu.c
@@ -204,9 +204,11 @@ static int init_pmu(void);
 static void pmu_start(void);
 static irqreturn_t via_pmu_interrupt(int irq, void *arg);
 static irqreturn_t gpio1_interrupt(int irq, void *arg);
+#ifdef CONFIG_PROC_FS
 static int pmu_info_proc_show(struct seq_file *m, void *v);
 static int pmu_irqstats_proc_show(struct seq_file *m, void *v);
 static int pmu_battery_proc_show(struct seq_file *m, void *v);
+#endif
 static void pmu_pass_intr(unsigned char *data, int len);
 static const struct proc_ops pmu_options_proc_ops;
 
@@ -857,6 +859,7 @@ query_battery_state(void)
 			2, PMU_SMART_BATTERY_STATE, pmu_cur_battery+1);
 }
 
+#ifdef CONFIG_PROC_FS
 static int pmu_info_proc_show(struct seq_file *m, void *v)
 {
 	seq_printf(m, "PMU driver version     : %d\n", PMU_DRIVER_VERSION);
@@ -977,6 +980,7 @@ static const struct proc_ops pmu_options_proc_ops = {
 	.proc_release	= single_release,
 	.proc_write	= pmu_options_proc_write,
 };
+#endif
 
 #ifdef CONFIG_ADB
 /* Send an ADB command */