[PATCH] UML: x86-64 config support

This adds architecture-specific Kconfig support, plus Kconfig_i386 and
Kconfig_x86_64.  Currently the only option defined there is CONFIG_64_BIT.
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/um/Kconfig_i386

+config 64_BIT
+	bool
+	default n
 config 3_LEVEL_PGTABLES
 	bool "Three-level pagetables"
 	default n

arch/um/Kconfig_x86_64

+config 64_BIT
+	bool
+	default y
+
+config 3_LEVEL_PGTABLES
+       bool
+       default y

arch/um/Makefile

@@ -79,6 +79,8 @@ define archhelp
   echo '		   find in the kernel root.'
 endef
 
+$(shell cd $(ARCH_DIR) && ln -sf Kconfig_$(SUBARCH) Kconfig_arch)
+
 prepare: $(ARCH_SYMLINKS) $(SYS_HEADERS) $(GEN_HEADERS) \
 	$(ARCH_DIR)/kernel/vmlinux.lds.S