[PATCH] sparse on uml (infrastructure bits)

Passes -m64 to sparse on uml/amd64, tells sparse to stay out of
USER_OBJS.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/arch/um/Makefile-x86_64 b/arch/um/Makefile-x86_64
index baddb5d..436abbb 100644
--- a/arch/um/Makefile-x86_64
+++ b/arch/um/Makefile-x86_64
@@ -8,6 +8,7 @@
 #it's needed for headers to work!
 CFLAGS += -U__$(SUBARCH)__ -fno-builtin
 USER_CFLAGS += -fno-builtin
+CHECKFLAGS  += -m64
 
 ELF_ARCH := i386:x86-64
 ELF_FORMAT := elf64-x86-64