linux-kernel - Re: [PATCH V2] acpi-cpufreq: replace per_cpu with driver

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Date:	Tue, 7 Jul 2015 20:04:43 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Pan Xinhui <xinhuix.pan@...el.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-pm@...r.kernel.org, rjw@...ysocki.net,
	"mnipxh@....com" <mnipxh@....com>,
	"yanmin_zhang@...ux.intel.com" <yanmin_zhang@...ux.intel.com>
Subject: Re: [PATCH V2] acpi-cpufreq: replace per_cpu with driver_data of
 policy

On 07-07-15, 20:43, Pan Xinhui wrote:
> 
> Drivers can store their internal per-policy information in
> policy->driver_data, lets use it.
> 
> we have benefits after this replacing.
> 1) memory saving.
> 2) policy is shared by several cpus, per_cpu seems not correct. using
> *driver_data* is more reasonable.
> 3) fix a memory leak in acpi_cpufreq_cpu_exit. as policy->cpu might
> change during cpu hotplug. So sometimes we cant't free *data*, use
> *driver_data* to fix it.
> 4) fix a zero return value of get_cur_freq_on_cpu. Only per_cpu of
> policy->cpu is set to *data*, if we try to get cpufreq on other cpus, we
> get zero instead of correct values. Use *driver_data* to fix it.
> 
> Signed-off-by: Pan Xinhui <xinhuix.pan@...el.com>
> ---
> Changes from V1:
> 	codes style fix, comments update
> 	move cpufreq_cpu_put(policy) after we get *driver_data*
> ---
>  drivers/cpufreq/acpi-cpufreq.c | 40 ++++++++++++++++++++++------------------
>  1 file changed, 22 insertions(+), 18 deletions(-)

Acked-by: Viresh Kumar <viresh.kumar@...aro.org>

-- 
viresh
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