linux-kernel - Re: [patch v11 09/23] ARM64 / ACPI: If we chose to boot from acpi then disable FDT

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Date:	Thu, 26 Mar 2015 10:57:46 +0000
From:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	"hanjun.guo@...aro.org" <hanjun.guo@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Will Deacon <Will.Deacon@....com>,
	Olof Johansson <olof@...om.net>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Mark Rutland <Mark.Rutland@....com>,
	Ashwin Chaugule <ashwinc@...eaurora.org>,
	Robert Richter <rric@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	"graeme.gregory@...aro.org" <graeme.gregory@...aro.org>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>,
	Marc Zyngier <Marc.Zyngier@....com>,
	"jcm@...hat.com" <jcm@...hat.com>,
	Timur Tabi <timur@...eaurora.org>,
	"msalter@...hat.com" <msalter@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	Mark Brown <broonie@...nel.org>,
	"suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
	Sudeep Holla <Sudeep.Holla@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [patch v11 09/23] ARM64 / ACPI: If we chose to boot from acpi
 then disable FDT

On Wed, Mar 25, 2015 at 05:00:27PM +0000, Catalin Marinas wrote:
> On Tue, Mar 24, 2015 at 10:02:42PM +0800, Hanjun Guo wrote:
> > If the early boot methods of acpi are happy that we have valid ACPI
> > tables and acpi=force has been passed, then do not unflat devicetree
> > effectively disabling further hardware probing from DT.
> [...]
> > --- a/arch/arm64/kernel/setup.c
> > +++ b/arch/arm64/kernel/setup.c
> > @@ -390,7 +390,8 @@ void __init setup_arch(char **cmdline_p)
> >  
> >  	early_ioremap_reset();
> >  
> > -	unflatten_device_tree();
> > +	if (acpi_disabled)
> > +		unflatten_device_tree();
> 
> So if we have acpi=force but the acpi failed, do we have acpi_disabled
> set? Or this requires Lorenzo's patch?

Hanjun did not squash with this patch a later patch in the series that
caters for that, I reverted it and added my change on top to make things
simpler, it is all done.

Lorenzo
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