linux-kernel - Re: [PATCH v3 4/5] ACPI / processor_idle : introduce ARCH_SUPPORTS_ACPI_PROCESSOR

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Date:	Tue, 23 Feb 2016 00:28:22 +0100
From:	"Rafael J. Wysocki" <rafael@...nel.org>
To:	Sudeep Holla <sudeep.holla@....com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
	x86@...nel.org, Al Stone <al.stone@...aro.org>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Mahesh Sivasubramanian <msivasub@...eaurora.org>,
	Ashwin Chaugule <ashwin.chaugule@...aro.org>,
	Prashanth Prakash <pprakash@...eaurora.org>
Subject: Re: [PATCH v3 4/5] ACPI / processor_idle : introduce ARCH_SUPPORTS_ACPI_PROCESSOR_CSTATE

On Mon, Feb 22, 2016 at 2:46 PM, Sudeep Holla <sudeep.holla@....com> wrote:
> Hi Rafael,
>
> On 17/02/16 12:21, Sudeep Holla wrote:
>>
>>
>>
>> On 16/02/16 20:18, Rafael J. Wysocki wrote:
>
>
> [..]
>
>>
>>> This way it all should work without any new Kconfig options.
>>>
>>
>> I agree with you in terms of avoiding new Kconfig option. However the
>> main reason for adding it is to avoid declaring dummy functions and
>> variables on ARM64.
>>
>> It's hard to justify the maintainers as it's totally useless on ARM64.
>> E.g. boot_option_idle_override, IDLE_NOMWAIT, acpi_unlazy_tlb,
>> arch_safe_halt.
>>
>> Other option is to push those under CONFIG_X86, but then I don't have
>> much idea on what are all needed for IA64, so took an option that
>> encapsulates everything under CSTATE feature Kconfig, which is not user
>> visible and selected by archs supporting it by default.
>>
>> I am open to any other alternative.
>>
>
> Whatever alternative methods I tried so far ended up much horrible than
> this. So any suggestions are much appreciated.

Well, you have to give me some time here, sorry.

I'm still not done with cpufreq at this point and it's going to
consume some more cycles I'm afraid.

Thanks,
Rafael