x86: compile apm and voyager module only when selected in Kconfig

Previously the complete files were #ifdef'ed, but now handle that in the
Makefile.

May save a minor bit of compilation time.

[ Stephen Rothwell <sfr@canb.auug.org.au>: build dependency fix ]
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/x86/Kconfig

@@ -1199,6 +1199,11 @@ source "kernel/power/Kconfig"
 
 source "drivers/acpi/Kconfig"
 
+config X86_APM_BOOT
+	bool
+	default y
+	depends on APM || APM_MODULE
+
 menuconfig APM
 	tristate "APM (Advanced Power Management) BIOS support"
 	depends on X86_32 && PM_SLEEP && !X86_VISWS

arch/x86/boot/Makefile

@@ -28,9 +28,11 @@ SVGA_MODE := -DSVGA_MODE=NORMAL_VGA
 targets		:= vmlinux.bin setup.bin setup.elf zImage bzImage
 subdir- 	:= compressed
 
-setup-y		+= a20.o apm.o cmdline.o copy.o cpu.o cpucheck.o edd.o
+setup-y		+= a20.o cmdline.o copy.o cpu.o cpucheck.o edd.o
 setup-y		+= header.o main.o mca.o memory.o pm.o pmjump.o
-setup-y		+= printf.o string.o tty.o video.o version.o voyager.o
+setup-y		+= printf.o string.o tty.o video.o version.o
+setup-$(CONFIG_X86_APM_BOOT) += apm.o
+setup-$(CONFIG_X86_VOYAGER) += voyager.o
 
 # The link order of the video-*.o modules can matter.  In particular,
 # video-vga.o *must* be listed first, followed by video-vesa.o.

arch/x86/boot/apm.c

@@ -19,8 +19,6 @@
 
 #include "boot.h"
 
-#if defined(CONFIG_APM) || defined(CONFIG_APM_MODULE)
-
 int query_apm_bios(void)
 {
 	u16 ax, bx, cx, dx, di;
@@ -95,4 +93,3 @@ int query_apm_bios(void)
 	return 0;
 }
 
-#endif

arch/x86/boot/voyager.c

@@ -16,8 +16,6 @@
 
 #include "boot.h"
 
-#ifdef CONFIG_X86_VOYAGER
-
 int query_voyager(void)
 {
 	u8 err;
@@ -42,5 +40,3 @@ int query_voyager(void)
 	copy_from_fs(data_ptr, di, 7);	/* Table is 7 bytes apparently */
 	return 0;
 }
-
-#endif /* CONFIG_X86_VOYAGER */