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

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Date:	Mon, 15 Sep 2014 15:51:07 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	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>,
	"jcm@...hat.com" <jcm@...hat.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 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)?

-- 
Catalin
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