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

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Date:	Wed, 25 Mar 2015 17:00:27 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Hanjun Guo <hanjun.guo@...aro.org>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Will Deacon <will.deacon@....com>,
	Olof Johansson <olof@...om.net>,
	Grant Likely <grant.likely@...aro.org>,
	Mark Rutland <mark.rutland@....com>,
	Ashwin Chaugule <ashwinc@...eaurora.org>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Robert Richter <rric@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Graeme Gregory <graeme.gregory@...aro.org>,
	linaro-acpi@...ts.linaro.org, Marc Zyngier <marc.zyngier@....com>,
	Jon Masters <jcm@...hat.com>,
	Timur Tabi <timur@...eaurora.org>,
	Mark Salter <msalter@...hat.com>, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org, Mark Brown <broonie@...nel.org>,
	Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
	Sudeep Holla <Sudeep.Holla@....com>,
	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 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?

-- 
Catalin

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