kbuild: clean up generation of modversions.h

There's no good reason why we would generate
include/linux/modversions.h from the top-level Makefile when
CONFIG_MODVERSION=y and from Rules.make otherwise.

Nor is there a good reason to call the target to do so
"update-modverfile" - "include/linux/modversions.h" makes
much more sense.

Makefile

@@ -261,6 +261,9 @@ scripts/mkdep scripts/split-include : FORCE
 # Generate dependencies
 # ---------------------------------------------------------------------------
 
+# 	In the same pass, generate module versions, that's why it's
+#	all mixed up here.
+
 .PHONY: depend dep $(patsubst %,_sfdep_%,$(SUBDIRS))
 
 depend dep: .hdepend
@@ -276,16 +279,17 @@ depend dep: .hdepend
 	  $(if $(filter dep depend,$(MAKECMDGOALS)),FORCE)
 	scripts/mkdep -- `find $(FINDHPATH) -name SCCS -prune -o -follow -name \*.h ! -name modversions.h -print` > $@
 	@$(MAKE) $(patsubst %,_sfdep_%,$(SUBDIRS))
-ifdef CONFIG_MODVERSIONS
-	@$(MAKE) update-modverfile
-endif
+	@$(MAKE) include/linux/modversions.h
 	@$(MAKE) archdep
 
 $(patsubst %,_sfdep_%,$(SUBDIRS)): FORCE
 	@$(MAKE) -C $(patsubst _sfdep_%, %, $@) fastdep
 
-# update modversions.h, but only if it would change
-update-modverfile:
+ifdef CONFIG_MODVERSIONS
+
+# 	Update modversions.h, but only if it would change.
+
+include/linux/modversions.h: FORCE
 	@(echo "#ifndef _LINUX_MODVERSIONS_H";\
 	  echo "#define _LINUX_MODVERSIONS_H"; \
 	  echo "#include <linux/modsetver.h>"; \
@@ -294,15 +298,22 @@ update-modverfile:
 	    if [ -f $$f ]; then echo "#include <linux/modules/$${f}>"; fi; \
 	  done; \
 	  echo "#endif"; \
-	) > $(TOPDIR)/include/linux/modversions.h.tmp
-	@if [ -r $(TOPDIR)/include/linux/modversions.h ] && cmp -s $(TOPDIR)/include/linux/modversions.h $(TOPDIR)/include/linux/modversions.h.tmp; then \
-		echo $(TOPDIR)/include/linux/modversions.h was not updated; \
-		rm -f $(TOPDIR)/include/linux/modversions.h.tmp; \
+	) > $@.tmp
+	@if [ -r $@ ] && cmp -s $@ $@.tmp; then \
+		echo $@ was not updated; \
+		rm -f $@.tmp; \
 	else \
-		echo $(TOPDIR)/include/linux/modversions.h was updated; \
-		mv -f $(TOPDIR)/include/linux/modversions.h.tmp $(TOPDIR)/include/linux/modversions.h; \
+		echo $@ was updated; \
+		mv -f $@.tmp $@; \
 	fi
 
+else # CONFIG_MODVERSIONS
+
+include/linux/modversions.h:
+	@echo "#include <linux/modsetver.h>" > $@
+
+endif # CONFIG_MODVERSIONS
+
 # ---------------------------------------------------------------------------
 # Modules
 

Rules.make

@@ -330,11 +330,6 @@ endif # export-objs
 
 $(active-objs): $(TOPDIR)/include/linux/modversions.h
 
-else
-
-$(TOPDIR)/include/linux/modversions.h:
-	@echo "#include <linux/modsetver.h>" > $@
-
 endif # CONFIG_MODVERSIONS
 
 ifneq "$(strip $(export-objs))" ""
@@ -400,4 +395,3 @@ if_changed = $(if $(strip $? \
 		          $(filter-out $($(1)),$(cmd_$(@F)))\
 			  $(filter-out $(cmd_$(@F)),$($(1)))),\
 	       @echo '$($(1))' && $($(1)) && echo 'cmd_$@ := $($(1))' > $(@D)/.$(@F).cmd)
-