linux-kernel - [PATCH v6 06/17] ARM64 / ACPI: If we chose to boot from acpi then disable FDT

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Date:	Sun,  4 Jan 2015 18:55:07 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	Catalin Marinas <catalin.marinas@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
	Mark Rutland <mark.rutland@....com>,
	Grant Likely <grant.likely@...aro.org>,
	Will Deacon <will.deacon@....com>
Cc:	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Graeme Gregory <graeme.gregory@...aro.org>,
	Sudeep Holla <Sudeep.Holla@....com>,
	Jon Masters <jcm@...hat.com>,
	Jason Cooper <jason@...edaemon.net>,
	Marc Zyngier <marc.zyngier@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Mark Brown <broonie@...nel.org>, Rob Herring <robh@...nel.org>,
	Robert Richter <rric@...nel.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Charles.Garcia-Tobin@....com, phoenix.liyi@...wei.com,
	Timur Tabi <timur@...eaurora.org>,
	suravee.suthikulpanit@....com, linux-acpi@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linaro-acpi@...ts.linaro.org, Hanjun Guo <hanjun.guo@...aro.org>
Subject: [PATCH v6 06/17] ARM64 / ACPI: If we chose to boot from acpi then disable FDT

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.

Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
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 22e6895..2534de3 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -410,7 +410,8 @@ void __init setup_arch(char **cmdline_p)
 
 	efi_idmap_init();
 
-	unflatten_device_tree();
+	if (acpi_disabled)
+		unflatten_device_tree();
 
 	psci_init();
 
-- 
1.9.1

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