linux-kernel - Re: [PATCH v4 06/18] ARM64 / ACPI: Introduce early

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Date:	Mon, 15 Sep 2014 12:31:16 -0400
From:	Jon Masters <jcm@...hat.com>
To:	Catalin Marinas <catalin.marinas@....com>,
	Olof Johansson <olof@...om.net>
CC:	"hanjun.guo@...aro.org" <hanjun.guo@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Mark Rutland <Mark.Rutland@....com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Will Deacon <Will.Deacon@....com>,
	"graeme.gregory@...aro.org" <graeme.gregory@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Sudeep Holla <Sudeep.Holla@....com>,
	Jason Cooper <jason@...edaemon.net>,
	Marc Zyngier <Marc.Zyngier@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Mark Brown <broonie@...nel.org>, Rob Herring <robh@...nel.org>,
	Robert Richter <rric@...nel.org>,
	Lv Zheng <lv.zheng@...el.com>,
	Robert Moore <robert.moore@...el.com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Liviu Dudau <Liviu.Dudau@....com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Charles Garcia-Tobin <Charles.Garcia-Tobin@....com>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>,
	Al Stone <al.stone@...aro.org>
Subject: Re: [PATCH v4 06/18] ARM64 / ACPI: Introduce early_param for "acpi"

On 09/15/2014 10:51 AM, Catalin Marinas wrote:
> On Mon, Sep 15, 2014 at 07:28:24AM +0100, Olof Johansson wrote:
>> On Fri, Sep 12, 2014 at 10:00:04PM +0800, Hanjun Guo wrote:
>>>  			See also Documentation/power/runtime_pm.txt, pci=noacpi
>>>  
>>> diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c
>>> index 9252f72..693da7f 100644
>>> --- a/arch/arm64/kernel/acpi.c
>>> +++ b/arch/arm64/kernel/acpi.c
>>> @@ -67,3 +67,18 @@ void __init acpi_boot_table_init(void)
>>>  	if (acpi_table_init())
>>>  		disable_acpi();
>>>  }
>>> +
>>> +static int __init parse_acpi(char *arg)
>>> +{
>>> +	if (!arg)
>>> +		return -EINVAL;
>>> +
>>> +	/* "acpi=off" disables both ACPI table parsing and interpreter */
>>> +	if (strcmp(arg, "off") == 0)
>>> +		disable_acpi();
>>> +	else
>>> +		return -EINVAL;	/* Core will print when we return error */
>>
>> For symmetry, you should handle acpi=force here too (i.e. if someone
>> disables by default, which I expect we'll ask for when this code is
>> first merged).
> 
> Does this mean you want another Kconfig option - ACPI_DEFAULT_OFF (which
> would be set by default)?

This would make sense. I mentioned this before since it gives distros an
opportunity to set this differently for their shipping preference
without the upstream having to default to being on.

Jon.


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