linux-kernel - Re: [PATCH v10 09/21] ARM64 / ACPI: If we chose to boot from acpi then disable FDT

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Message-ID: <20150318165200.GA3421@e104818-lin.cambridge.arm.com>
Date:	Wed, 18 Mar 2015 16:52:01 +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>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	Mark Brown <broonie@...nel.org>, suravee.suthikulpanit@....com,
	Sudeep Holla <Sudeep.Holla@....com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v10 09/21] ARM64 / ACPI: If we chose to boot from acpi
 then disable FDT

On Wed, Mar 11, 2015 at 08:39:35PM +0800, Hanjun Guo wrote:
> From: Graeme Gregory <graeme.gregory@...aro.org>
> 
> 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.
> 
> CC: Catalin Marinas <catalin.marinas@....com>
> CC: Will Deacon <will.deacon@....com>
> Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
> Tested-by: Yijing Wang <wangyijing@...wei.com>
> Tested-by: Mark Langsdorf <mlangsdo@...hat.com>
> Tested-by: Jon Masters <jcm@...hat.com>
> Tested-by: Timur Tabi <timur@...eaurora.org>
> Tested-by: Robert Richter <rrichter@...ium.com>
> Acked-by: Robert Richter <rrichter@...ium.com>
> Acked-by: Olof Johansson <olof@...om.net>
> Acked-by: Grant Likely <grant.likely@...aro.org>
> Signed-off-by: Graeme Gregory <graeme.gregory@...aro.org>
> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
> ---
>  arch/arm64/kernel/setup.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
> index 4f1a014..e8c7000 100644
> --- 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();

Lorenzo commented on the previous patch that acpi=force still allows the
fall back to DT. I guess you may want something like:

	if (acpi_disabled && !param_acpi_force)
		unflatten_device_tree();

-- 
Catalin
--
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