On Monday, November 18, 2013 08:48:05 PM Hanjun Guo wrote:
On 18 November 2013 06:29, Rafael J. Wysocki rjw@rjwysocki.net wrote:
On Saturday, November 09, 2013 06:36:11 PM al.stone@linaro.org wrote:
From: Al Stone ahs3@redhat.com
To enable the hardware reduced mode of ACPI on some platforms (such as ARM), we need to modify the kernel code and set ACPI_REDUCED_HARDWARE to TRUE in the ACPICA source.
This can be done more resonably by introducing a kernel config item to enable/disable ACPI_REDUCED_HARDWARE. We can then change the kernel config instead of having to modify the kernel source directly to enable the reduced hardware mode of ACPI.
Lv Zheng suggested that this configuration item does not belong in
ACPICA,
the upstream source for much of the ACPI internals, but rather to the Linux kernel itself. Hence, we introduce this flag so that we can make ACPI_REDUCED_HARDWARE configurable. For the details of the discussion, please refer to: http://www.spinics.net/lists/linux-acpi/msg46369.html
Signed-off-by: Hanjun Guo hanjun.guo@linaro.org Signed-off-by: Al Stone al.stone@linaro.org
drivers/acpi/Kconfig | 8 ++++++++ include/acpi/platform/aclinux.h | 4 ++++ 2 files changed, 12 insertions(+)
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig index 589da05..7bbd3b0 100644 --- a/drivers/acpi/Kconfig +++ b/drivers/acpi/Kconfig @@ -354,6 +354,14 @@ config ACPI_BGRT data from the firmware boot splash. It will appear under /sys/firmware/acpi/bgrt/ .
+config ACPI_REDUCED_HARDWARE
bool "Hardware-reduced ACPI support"depends on !(IA64 || X86)Why don't you use
depends on (ARM || ARM64)here instead?
hardware-reduced is not restricted to ARM platforms, that's why
I used depends on !(IA64 || X86) here.
So what exactly are the other platforms using ACPI in the Linux kernel?