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@xxxxxxxxxx>
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@xxxxxxxxxx>
---
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 */
/******************************************************************************
*
--
1.7.9.5
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