linux-kernel - Re: [PATCH v3 1/2] cpufreq: tegra: Call tegra_cpufreq

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Date:	Mon, 9 Dec 2013 16:41:14 +0800
From:	bilhuang <bilhuang@...dia.com>
To:	Stephen Warren <swarren@...dotorg.org>,
	"rjw@...ysocki.net" <rjw@...ysocki.net>,
	"viresh.kumar@...aro.org" <viresh.kumar@...aro.org>,
	"thierry.reding@...il.com" <thierry.reding@...il.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v3 1/2] cpufreq: tegra: Call tegra_cpufreq_init() specifically
 in machine code

On 12/06/2013 06:54 AM, Stephen Warren wrote:
> On 12/05/2013 12:44 AM, Bill Huang wrote:
>> Move the call from module_init to Tegra machine codes so it won't be
>> called in a multi-platform kernel running on non-Tegra SoCs.
>
>> diff --git a/include/linux/tegra-soc.h b/include/linux/tegra-soc.h
>
> It might be better to create <linux/tegra-cpufreq.h> for the interface
> to the cpufreq driver; tegra-soc.h is for the interface to core Tegra
> code *from* other drivers.
Thanks, will do.
>
>> +#ifdef CONFIG_ARM_TEGRA_CPUFREQ
>> +int tegra_cpufreq_init(void);
>> +#else
>> +static inline int tegra_cpufreq_init(void)
>> +{
>> +	return -EINVAL;
>> +}
>> +#endif
>
> Probably best to "return 0" from the !CONFIG_ARM_TEGRA_CPUFREQ case; the
> whole point is to isolate callers from having to care whether
> CONFIG_ARM_TEGRA_CPUFREQ is enabled, and making the function act like it
> worked OK is part of that isolation.
>
OK thanks.
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