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Date: Mon, 15 Sep 2014 15:51:07 +0100
From: Catalin Marinas <catalin.marinas@arm.com>
To: Olof Johansson <olof@lixom.net>
Cc: "hanjun.guo@linaro.org" <hanjun.guo@linaro.org>,
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Subject: Re: [PATCH v4 06/18] ARM64 / ACPI: Introduce early_param for "acpi"
Message-ID: <20140915145106.GC5415@arm.com>
References: <1410530416-30200-1-git-send-email-hanjun.guo@linaro.org>
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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