linux-kernel - Re: [PATCH] acpi-cpufreq: Add a miss ifdef CONFIG_X86_ACPI_CPUFREQ

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Date:	Fri, 10 Jul 2015 22:44:25 +0200
From:	"Rafael J. Wysocki" <rafael@...nel.org>
To:	Pan Xinhui <xinhuix.pan@...el.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"rjw@...ysocki.net" <rjw@...ysocki.net>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	"yanmin_zhang@...ux.intel.com" <yanmin_zhang@...ux.intel.com>,
	"mnipxh@....com" <mnipxh@....com>
Subject: Re: [PATCH] acpi-cpufreq: Add a miss ifdef CONFIG_X86_ACPI_CPUFREQ_CPB

Hi,

On Fri, Jul 10, 2015 at 7:50 AM, Pan Xinhui <xinhuix.pan@...el.com> wrote:
>
> If CONFIG_X86_ACPI_CPUFREQ_CPB has not been defined, the placeholder for
> cpb is not needed. Add ifdef around it.
>
> Signed-off-by: Pan Xinhui <xinhuix.pan@...el.com>
> ---
>  drivers/cpufreq/acpi-cpufreq.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
> index e7fcaa6..314a19e 100644
> --- a/drivers/cpufreq/acpi-cpufreq.c
> +++ b/drivers/cpufreq/acpi-cpufreq.c
> @@ -884,7 +884,9 @@ static int acpi_cpufreq_resume(struct cpufreq_policy *policy)
>  static struct freq_attr *acpi_cpufreq_attr[] = {
>         &cpufreq_freq_attr_scaling_available_freqs,
>         &freqdomain_cpus,
> +#ifdef CONFIG_X86_ACPI_CPUFREQ_CPB
>         NULL,   /* this is a placeholder for cpb, do not remove */
> +#endif

Adding the ifdef here doesn't change anything, because the next NULL
will play the role of the one you've just #ifdefed and the structure
will be filled with zeros from that point on anyway.

You'd need to #ifdef it in the struct freq_attr definition, but I'm
not sure it's worth the effort.

>         NULL,
>  };

Thanks,
Rafael
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