2 files changed, 19 insertions, 0 deletions

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 4770de5707b9..9fd6a7a124c0 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -343,6 +343,19 @@ config ACPI_BGRT
           data from the firmware boot splash. It will appear under
           /sys/firmware/acpi/bgrt/ .
 
+config ACPI_REDUCED_HARDWARE_ONLY
+        bool "Hardware-reduced ACPI support only" if EXPERT
+        def_bool n
+        depends on ACPI
+        help
+        This config item changes the way the ACPI code is built.  When this
+        option is selected, the kernel will use a specialized version of
+        ACPICA that ONLY supports the ACPI "reduced hardware" mode.  The
+        resulting kernel will be smaller but it will also be restricted to
+        running in ACPI reduced hardware mode ONLY.
+
+        If you are unsure what to do, do not enable this option.
+
 source "drivers/acpi/apei/Kconfig"
 
 config ACPI_EXTLOG
diff --git a/include/acpi/platform/aclinux.h b/include/acpi/platform/aclinux.h
index 008aa287c7a9..30c9a7c1af88 100644
--- a/include/acpi/platform/aclinux.h
+++ b/include/acpi/platform/aclinux.h
@@ -52,6 +52,12 @@
 
 #ifdef __KERNEL__
 
+/* Compile for reduced hardware mode only with this kernel config */
+
+#ifdef CONFIG_ACPI_REDUCED_HARDWARE_ONLY
+#define ACPI_REDUCED_HARDWARE 1
+#endif
+
 #include <linux/string.h>
 #include <linux/kernel.h>
 #include <linux/ctype.h>