linux-kernel - Re: [PATCH 1/2] PPC: powernv: remove redundant cpuidle_idle

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Message-ID: <52F3BCFE.3010703@linux.vnet.ibm.com>
Date:	Thu, 06 Feb 2014 22:19:02 +0530
From:	Preeti U Murthy <preeti@...ux.vnet.ibm.com>
To:	Daniel Lezcano <daniel.lezcano@...aro.org>
CC:	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux ARM Kernel ML <linux-arm-kernel@...ts.infradead.org>,
	linuxppc-dev@...ts.ozlabs.org,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Lists linaro-kernel <linaro-kernel@...ts.linaro.org>
Subject: Re: [PATCH 1/2] PPC: powernv: remove redundant cpuidle_idle_call()

Hi Daniel,

On 02/06/2014 09:55 PM, Daniel Lezcano wrote:
> Hi Nico,
> 
> 
> On 6 February 2014 14:16, Nicolas Pitre <nicolas.pitre@...aro.org> wrote:
> 
>> The core idle loop now takes care of it.
>>
>> Signed-off-by: Nicolas Pitre <nico@...aro.org>
>> ---
>>  arch/powerpc/platforms/powernv/setup.c | 13 +------------
>>  1 file changed, 1 insertion(+), 12 deletions(-)
>>
>> diff --git a/arch/powerpc/platforms/powernv/setup.c
>> b/arch/powerpc/platforms/powernv/setup.c
>> index 21166f65c9..a932feb290 100644
>> --- a/arch/powerpc/platforms/powernv/setup.c
>> +++ b/arch/powerpc/platforms/powernv/setup.c
>> @@ -26,7 +26,6 @@
>>  #include <linux/of_fdt.h>
>>  #include <linux/interrupt.h>
>>  #include <linux/bug.h>
>> -#include <linux/cpuidle.h>
>>
>>  #include <asm/machdep.h>
>>  #include <asm/firmware.h>
>> @@ -217,16 +216,6 @@ static int __init pnv_probe(void)
>>         return 1;
>>  }
>>
>> -void powernv_idle(void)
>> -{
>> -       /* Hook to cpuidle framework if available, else
>> -        * call on default platform idle code
>> -        */
>> -       if (cpuidle_idle_call()) {
>> -               power7_idle();
>> -       }
>>
> 
> The cpuidle_idle_call is called from arch_cpu_idle in
> arch/powerpc/kernel/idle.c between a ppc64_runlatch_off|on section.
> Shouldn't the cpuidle-powernv driver call these functions when entering
> idle ?

Yes they should, I will send out a patch that does that ontop of this.
There have been cpuidle driver cleanups for powernv and pseries in this
merge window. While no change would be required in the pseries cpuidle
driver as a result of Nicolas's cleanup, we would need to add the
ppc64_runlatch_on and off functions before and after the entry into the
powernv idle states.

Thanks

Regards
Preeti U Murthy
> 
>   -- Daniel
> 
> 
>> -}
>> -
>>  define_machine(powernv) {
>>         .name                   = "PowerNV",
>>         .probe                  = pnv_probe,
>> @@ -236,7 +225,7 @@ define_machine(powernv) {
>>         .show_cpuinfo           = pnv_show_cpuinfo,
>>         .progress               = pnv_progress,
>>         .machine_shutdown       = pnv_shutdown,
>> -       .power_save             = powernv_idle,
>> +       .power_save             = power7_idle,
>>         .calibrate_decr         = generic_calibrate_decr,
>>  #ifdef CONFIG_KEXEC
>>         .kexec_cpu_down         = pnv_kexec_cpu_down,
>> --
>> 1.8.4.108.g55ea5f6
>>
>>
> 

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