linux-kernel - [PATCH v3 1/3] ACPI: ARM64 does not have a BIOS add config for BIOS table scan.

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Message-Id: <1405677774-16787-2-git-send-email-hanjun.guo@linaro.org>
Date:	Fri, 18 Jul 2014 18:02:52 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	Graeme Gregory <graeme.gregory@...aro.org>,
	Tony Luck <tony.luck@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	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 v3 1/3] ACPI: ARM64 does not have a BIOS add config for BIOS table scan.

From: Graeme Gregory <graeme.gregory@...aro.org>

With the addition of ARM64 that does not have a traditional BIOS to
scan, add a config option which is selected on x86 (ia64 doesn't need
it either, it is EFI/UEFI based system) to do the traditional BIOS
scanning for tables.

Signed-off-by: Graeme Gregory <graeme.gregory@...aro.org>
Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
---
 arch/x86/Kconfig     |    1 +
 drivers/acpi/Kconfig |    3 +++
 drivers/acpi/osl.c   |    4 +++-
 3 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index a8f749e..6d9f1d8 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -131,6 +131,7 @@ config X86
 	select HAVE_CC_STACKPROTECTOR
 	select GENERIC_CPU_AUTOPROBE
 	select HAVE_ARCH_AUDITSYSCALL
+	select ACPI_LEGACY_TABLES_LOOKUP if ACPI
 
 config INSTRUCTION_DECODER
 	def_bool y
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index a34a228..970524c 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -42,6 +42,9 @@ menuconfig ACPI
 
 if ACPI
 
+config ACPI_LEGACY_TABLES_LOOKUP
+	bool
+
 config ACPI_SLEEP
 	bool
 	depends on SUSPEND || HIBERNATION
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index bad25b0..3abe9b2 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -259,12 +259,14 @@ acpi_physical_address __init acpi_os_get_root_pointer(void)
 			       "System description tables not found\n");
 			return 0;
 		}
-	} else {
+	} else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) {
 		acpi_physical_address pa = 0;
 
 		acpi_find_root_pointer(&pa);
 		return pa;
 	}
+
+	return 0;
 }
 
 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
-- 
1.7.9.5

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