On 2013-9-17 1:26, Moore, Robert wrote:
- #define ACPI_REDUCED_HARDWARE TRUE
The intent of this feature is of course, to remove all code that is not needed -- specifically for hardware-reduced machines where the size of the kernel is important.
Ok, how about this patch below, is it reasonable to you?
From b10bc1d2f9a3ff09abfb6990412aa1cf62d56937 Mon Sep 17 00:00:00 2001
From: Hanjun Guo hanjun.guo@linaro.org Date: Wed, 18 Sep 2013 17:19:23 +0800 Subject: [PATCH] ACPI: Introduce CONFIG_ACPI_REDUCED_HARDWARE to enable reduced hardware
If we want to enable reduced hardware ACPI on some platform (such as ARM), we need to modify the kernel code and set ACPI_REDUCED_HARDWARE to TRUE.
This is not reasonable, so introduce a kernel config to enable it, and no need for kernel modification when we use hardware-reduced ACPI.
Signed-off-by: Hanjun Guo hanjun.guo@linaro.org --- drivers/acpi/Kconfig | 8 ++++++++ include/acpi/acconfig.h | 4 ++++ 2 files changed, 12 insertions(+)
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig index 0d7f6eb..1232a7b 100644 --- a/drivers/acpi/Kconfig +++ b/drivers/acpi/Kconfig @@ -413,6 +413,14 @@ 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 ARM || ARM64 + help + This config adds support for Hardware-reduced ACPI. When this option + is selected, will generate a specialized version of ACPICA that ONLY + supports the ACPI 5.0 "reduced hardware". + source "drivers/acpi/apei/Kconfig"
endif # ACPI diff --git a/include/acpi/acconfig.h b/include/acpi/acconfig.h index 1c16f82..15254f5 100644 --- a/include/acpi/acconfig.h +++ b/include/acpi/acconfig.h @@ -100,7 +100,11 @@ * ACPI PM timer * FACS table (Waking vectors and Global Lock) */ +#ifdef CONFIG_ACPI_REDUCED_HARDWARE +#define ACPI_REDUCED_HARDWARE TRUE +#else #define ACPI_REDUCED_HARDWARE FALSE +#endif /* CONFIG_ACPI_REDUCED_HARDWARE */
/****************************************************************************** *