linux-kernel - Re: [PATCH v2 6/9] intel_idle: do C1E promotion disable quirk for hotplugged CPUs

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Date:	Fri, 20 Dec 2013 22:52:35 +0100
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	rjw@...ysocki.net
CC:	lenb@...nel.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, kyungmin.park@...sung.com
Subject: Re: [PATCH v2 6/9] intel_idle: do C1E promotion disable quirk for
 hotplugged CPUs

On 12/20/2013 07:47 PM, Bartlomiej Zolnierkiewicz wrote:
> If the system is booted with some CPUs offline C1E promotion disable quirk
> won't be applied because on_each_cpu() in intel_idle_cpuidle_driver_init()
> operates only on online CPUs. Fix it by adding the C1E promotion disable
> handling to intel_idle_cpu_init() (which is also called during CPU_ONLINE
> operation).
>
> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
> Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
> Cc: Len Brown <lenb@...nel.org>

Reviewed-by: Daniel Lezcano <daniel.lezcano@...aro.org>

> ---
>   drivers/idle/intel_idle.c | 3 +++
>   1 file changed, 3 insertions(+)
>
> diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c
> index 92d1206..38da3fb 100644
> --- a/drivers/idle/intel_idle.c
> +++ b/drivers/idle/intel_idle.c
> @@ -683,6 +683,9 @@ static int intel_idle_cpu_init(int cpu)
>   	if (icpu->auto_demotion_disable_flags)
>   		smp_call_function_single(cpu, auto_demotion_disable, NULL, 1);
>
> +	if (icpu->disable_promotion_to_c1e)
> +		smp_call_function_single(cpu, c1e_promotion_disable, NULL, 1);
> +
>   	return 0;
>   }

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