[PATCH v3 7/9] ACPI: enable arch-specific compilation for _OSI and the blacklist

[al.stone@linaro.org (al.stone at linaro.org)]

From: Al Stone <al.stone@linaro.org>

Whether arch-specific functions are used or not now depends on the config
option CONFIG_ARCH_SPECIFIC_ACPI_OSI.  By default, this is set false which
causes the x86/ia64 versions to be used, just as is done today.  Setting
this option true causes architecture-specific implementations to be built
instead; this patch also provides arm64 implementations.

For x86/ia64, there is no functional change.  Other architectures will have
to add files to provide their specific functionality.

Signed-off-by: Al Stone <al.stone@linaro.org>
---
 drivers/acpi/Kconfig  | 3 +++
 drivers/acpi/Makefile | 7 ++++++-
 include/linux/acpi.h  | 8 ++++++++
 3 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index b340509..4d91f22 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -53,6 +53,9 @@ config ACPI_SLEEP
 	depends on SUSPEND || HIBERNATION
 	default y
 
+config ARCH_SPECIFIC_ACPI_OSI
+	def_bool n
+
 config ACPI_PROCFS_POWER
 	bool "Deprecated power /proc/acpi directories"
 	depends on PROC_FS
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index 97191eb..1428464 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -18,9 +18,14 @@ obj-y				+= acpi.o \
 					acpica/
 
 # All the builtin files are in the "acpi." module_param namespace.
-acpi-y				+= osl.o utils.o reboot.o osi.o
+acpi-y				+= osl.o utils.o reboot.o
 acpi-y				+= nvs.o
 
+# _OSI related files
+ifneq ($(CONFIG_ARCH_SPECIFIC_ACPI_OSI), y)
+acpi-y				+= osi.o
+endif
+
 # Power management related files
 acpi-y				+= wakeup.o
 acpi-y				+= sleep.o
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 71cdeb6..97185a1 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -279,9 +279,17 @@ static inline int acpi_video_display_switch_support(void)
 #endif /* defined(CONFIG_ACPI_VIDEO) || defined(CONFIG_ACPI_VIDEO_MODULE) */
 
 extern int acpi_blacklisted(void);
+
+#ifdef CONFIG_ARCH_SPECIFIC_ACPI_OSI
+static inline void __init acpi_dmi_osi_linux(int enable,
+					     const struct dmi_system_id *d) { }
+static inline void __init acpi_osi_setup(char *str) { }
+#else
 extern void __init acpi_dmi_osi_linux(int enable,
 				      const struct dmi_system_id *d);
 extern void __init acpi_osi_setup(char *str);
+#endif
+
 extern u32 acpi_osi_handler(acpi_string interface, u32 supported);
 
 #ifdef CONFIG_ACPI_NUMA
-- 
2.1.0