acpi: simplify module_param namespace

Rather than overriding MODULE_PARAM_PREFIX, build via acpi.o so
KBUILD_MODNAME is set to "acpi".

This is the logical way to do it, even though acpi cannot be a module
due to these config options being bool.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
---
 drivers/acpi/Makefile |   10 ++++++----
 drivers/acpi/debug.c  |    5 -----
 drivers/acpi/power.c  |    4 ----
 drivers/acpi/system.c |    4 ----
 4 files changed, 6 insertions(+), 17 deletions(-)

diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -21,10 +21,15 @@ obj-$(CONFIG_X86)		+= blacklist.o
 #
 # ACPI Core Subsystem (Interpreter)
 #
-obj-y				+= osl.o utils.o reboot.o\
+obj-y				+= acpi.o \
 				   dispatcher/ events/ executer/ hardware/ \
 				   namespace/ parser/ resources/ tables/ \
 				   utilities/
+
+# "acpi." module_param namespace.
+acpi-y				+= osl.o utils.o reboot.o power.o
+acpi-$(CONFIG_ACPI_SYSTEM)	+= system.o event.o
+acpi-$(CONFIG_ACPI_DEBUG)	+= debug.o
 
 #
 # ACPI Bus and Device Drivers
@@ -55,9 +60,6 @@ obj-$(CONFIG_ACPI_PROCESSOR)	+= processo
 obj-$(CONFIG_ACPI_PROCESSOR)	+= processor.o
 obj-$(CONFIG_ACPI_CONTAINER)	+= container.o
 obj-$(CONFIG_ACPI_THERMAL)	+= thermal.o
-obj-y				+= power.o
-obj-$(CONFIG_ACPI_SYSTEM)	+= system.o event.o
-obj-$(CONFIG_ACPI_DEBUG)	+= debug.o
 obj-$(CONFIG_ACPI_NUMA)		+= numa.o
 obj-$(CONFIG_ACPI_WMI)		+= wmi.o
 obj-$(CONFIG_ACPI_ASUS)		+= asus_acpi.o
diff --git a/drivers/acpi/debug.c b/drivers/acpi/debug.c
--- a/drivers/acpi/debug.c
+++ b/drivers/acpi/debug.c
@@ -13,11 +13,6 @@
 
 #define _COMPONENT		ACPI_SYSTEM_COMPONENT
 ACPI_MODULE_NAME("debug");
-
-#ifdef MODULE_PARAM_PREFIX
-#undef MODULE_PARAM_PREFIX
-#endif
-#define MODULE_PARAM_PREFIX "acpi."
 
 struct acpi_dlayer {
 	const char *name;
diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
--- a/drivers/acpi/power.c
+++ b/drivers/acpi/power.c
@@ -54,10 +54,6 @@ ACPI_MODULE_NAME("power");
 #define ACPI_POWER_RESOURCE_STATE_ON	0x01
 #define ACPI_POWER_RESOURCE_STATE_UNKNOWN 0xFF
 
-#ifdef MODULE_PARAM_PREFIX
-#undef MODULE_PARAM_PREFIX
-#endif
-#define MODULE_PARAM_PREFIX "acpi."
 int acpi_power_nocheck;
 module_param_named(power_nocheck, acpi_power_nocheck, bool, 000);
 
diff --git a/drivers/acpi/system.c b/drivers/acpi/system.c
--- a/drivers/acpi/system.c
+++ b/drivers/acpi/system.c
@@ -33,10 +33,6 @@
 
 #define _COMPONENT		ACPI_SYSTEM_COMPONENT
 ACPI_MODULE_NAME("system");
-#ifdef MODULE_PARAM_PREFIX
-#undef MODULE_PARAM_PREFIX
-#endif
-#define MODULE_PARAM_PREFIX "acpi."
 
 #define ACPI_SYSTEM_CLASS		"system"
 #define ACPI_SYSTEM_DEVICE_NAME		"System"