linux-kernel - [PATCH] drivers: acpi: add opt-out of apple specific property parsing

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Message-Id: <20201117201825.5407-1-info@metux.net>
Date:   Tue, 17 Nov 2020 21:18:25 +0100
From:   "Enrico Weigelt, metux IT consult" <info@...ux.net>
To:     linux-kernel@...r.kernel.org
Cc:     linux-acpi@...r.kernel.org
Subject: [PATCH] drivers: acpi: add opt-out of apple specific property parsing

Most x86 machines aren't Apple machines, especially VMs.
Therefore allow opt-out, making the kernel a few KBs smaller,
eg. for embedded or high-density VMs.

Signed-off-by: Enrico Weigelt, metux IT consult <info@...ux.net>
---
 drivers/acpi/Kconfig    | 9 +++++++++
 drivers/acpi/Makefile   | 2 +-
 drivers/acpi/internal.h | 2 +-
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index edf1558c1105..398a9ae73705 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -79,6 +79,15 @@ config ACPI_DEBUGGER_USER
 
 endif
 
+config ACPI_APPLE
+	bool "Apple ACPI properties support"
+	default y if X86
+	help
+	  Extraction of apple specific ACPI properties.
+
+	  Say N if you're sure the kernel won't be used on an Apple machine
+	  and wanna save a few kb of memory. (embedded or hi-density VMs)
+
 config ACPI_SPCR_TABLE
 	bool "ACPI Serial Port Console Redirection Support"
 	default y if X86
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index 44e412506317..ed1f4405c90a 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -52,7 +52,7 @@ acpi-y				+= evged.o
 acpi-y				+= sysfs.o
 acpi-y				+= property.o
 acpi-$(CONFIG_X86)		+= acpi_cmos_rtc.o
-acpi-$(CONFIG_X86)		+= x86/apple.o
+acpi-$(CONFIG_ACPI_APPLE)	+= x86/apple.o
 acpi-$(CONFIG_X86)		+= x86/utils.o
 acpi-$(CONFIG_DEBUG_FS)		+= debugfs.o
 acpi-y				+= acpi_lpat.o
diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index e3638bafb941..fa1b6ef7829a 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -239,7 +239,7 @@ static inline void suspend_nvs_restore(void) {}
 void acpi_init_properties(struct acpi_device *adev);
 void acpi_free_properties(struct acpi_device *adev);
 
-#ifdef CONFIG_X86
+#ifdef CONFIG_ACPI_APPLE
 void acpi_extract_apple_properties(struct acpi_device *adev);
 #else
 static inline void acpi_extract_apple_properties(struct acpi_device *adev) {}
-- 
2.11.0