linux-kernel - Re: [PATCH -next] clocksource/drivers/arm_arch_timer: Make symbol 'arch_timer

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Date:   Tue, 11 May 2021 15:53:08 +0800
From:   Jisheng Zhang <Jisheng.Zhang@...aptics.com>
To:     Marc Zyngier <maz@...nel.org>
Cc:     Zou Wei <zou_wei@...wei.com>, <mark.rutland@....com>,
        <daniel.lezcano@...aro.org>, <tglx@...utronix.de>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -next] clocksource/drivers/arm_arch_timer: Make symbol
 'arch_timer_rate1' static

On Tue, 11 May 2021 08:14:42 +0100 Marc Zyngier wrote:


> 
> 
> [+ Jisheng Zhang]
> 
> On Tue, 11 May 2021 07:46:23 +0100,
> Zou Wei <zou_wei@...wei.com> wrote:
> >
> > The sparse tool complains as follows:
> >
> > drivers/clocksource/arm_arch_timer.c:67:5: warning:
> >  symbol 'arch_timer_rate1' was not declared. Should it be static?
> >
> > This symbol is not used outside of arm_arch_timer.c, so marks it
> > static.  
> 
> It is worse than that. This variable is not used *at all*, and has
> been added by e2bf384d4329 ("clocksource/drivers/arm_arch_timer: Add
> __ro_after_init and __init"). Not sure how we missed that.

Oops, my mistake. Sorry for that. IIRC, I added the __ro_after_init
marker, then want to prove the effectiveness of __ro_after_init with
a new and non-used variable. But later forgot to remove it.

> 
> Please post a patch removing this variable altogether.

Just sent out a patch to remove this variable.

> 
> Thanks,
> 
>         M.
> 
> >
> > Reported-by: Hulk Robot <hulkci@...wei.com>
> > Signed-off-by: Zou Wei <zou_wei@...wei.com>
> > ---
> >  drivers/clocksource/arm_arch_timer.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
> > index fe1a826..800aaa9 100644
> > --- a/drivers/clocksource/arm_arch_timer.c
> > +++ b/drivers/clocksource/arm_arch_timer.c
> > @@ -64,7 +64,7 @@ struct arch_timer {
> >  #define to_arch_timer(e) container_of(e, struct arch_timer, evt)
> >
> >  static u32 arch_timer_rate __ro_after_init;
> > -u32 arch_timer_rate1 __ro_after_init;
> > +static u32 arch_timer_rate1 __ro_after_init;
> >  static int arch_timer_ppi[ARCH_TIMER_MAX_TIMER_PPI] __ro_after_init;
> >
> >  static const char *arch_timer_ppi_names[ARCH_TIMER_MAX_TIMER_PPI] = {
> > --
> > 2.6.2
> >
> >  
> 
> --
> Without deviation from the norm, progress is not possible.