linux-kernel - Re: [PATCH 05/16] blackfin idle: delete pm

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Date:	Wed, 20 Feb 2013 20:52:18 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Lars-Peter Clausen <lars@...afoo.de>
Cc:	Len Brown <lenb@...nel.org>, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, Len Brown <len.brown@...el.com>,
	uclinux-dist-devel@...ckfin.uclinux.org
Subject: Re: [PATCH 05/16] blackfin idle: delete pm_idle

On Monday, February 18, 2013 05:28:19 PM Lars-Peter Clausen wrote:
> On 02/10/2013 06:58 AM, Len Brown wrote:
> > From: Len Brown <len.brown@...el.com>
> > 
> > pm_idle is dead code on blackfin.
> > 
> > Signed-off-by: Len Brown <len.brown@...el.com>
> > Cc: uclinux-dist-devel@...ckfin.uclinux.org
> > ---
> >  arch/blackfin/kernel/process.c | 7 -------
> >  1 file changed, 7 deletions(-)
> > 
> > diff --git a/arch/blackfin/kernel/process.c b/arch/blackfin/kernel/process.c
> > index 3e16ad9..8061426 100644
> > --- a/arch/blackfin/kernel/process.c
> > +++ b/arch/blackfin/kernel/process.c
> > @@ -39,12 +39,6 @@ int nr_l1stack_tasks;
> >  void *l1_stack_base;
> >  unsigned long l1_stack_len;
> >  
> > -/*
> > - * Powermanagement idle function, if any..
> > - */
> > -void (*pm_idle)(void) = NULL;
> > -EXPORT_SYMBOL(pm_idle);
> > -
> >  void (*pm_power_off)(void) = NULL;
> >  EXPORT_SYMBOL(pm_power_off);
> >  
> > @@ -81,7 +75,6 @@ void cpu_idle(void)
> >  {
> >  	/* endless idle loop with no priority at all */
> >  	while (1) {
> > -		void (*idle)(void) = pm_idle;
> 
> Hi,
> 
> This results in the following error:
> 
> arch/blackfin/kernel/process.c: In function ‘cpu_idle’:
> arch/blackfin/kernel/process.c:83: error: ‘idle’ undeclared (first use in
> this function)
> arch/blackfin/kernel/process.c:83: error: (Each undeclared identifier is
> reported only once
> arch/blackfin/kernel/process.c:83: error: for each function it appears in.)
> arch/blackfin/kernel/process.c:88: error: implicit declaration of function
> ‘idle’
> 
> 
> This change on top of your patch, fixes it.

Lars, I need your sign-off for the patch below.  May I add it?

Rafael


> diff --git a/arch/blackfin/kernel/process.c b/arch/blackfin/kernel/process.c
> index 8061426..9782c03 100644
> --- a/arch/blackfin/kernel/process.c
> +++ b/arch/blackfin/kernel/process.c
> @@ -80,12 +80,10 @@ void cpu_idle(void)
>  		if (cpu_is_offline(smp_processor_id()))
>  			cpu_die();
>  #endif
> -		if (!idle)
> -			idle = default_idle;
>  		tick_nohz_idle_enter();
>  		rcu_idle_enter();
>  		while (!need_resched())
> -			idle();
> +			default_idle();
>  		rcu_idle_exit();
>  		tick_nohz_idle_exit();
>  		preempt_enable_no_resched();
> 
> 
> Otherwise the patch seems to work fine.
> 
> - Lars
> --
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-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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