[PATCH] kbuild: Create .tmp_versions when building external modules

From: Sam Ravnborg <sam@ravnborg.org>

When building external modules the $PWD/.tmp_versions directory is used.
The .tmp_versions directory in the kernel tree cannot be used because this
would clutter up the kernel tree especially when more than one external
module is being build for the same kernel tree.

This patch make sure to create $PWD/.tmp_versions, and to delete it during
make clean.  It also removes warning about 'messed with SUBDIRS', this is
no longer relevant when .tmp_versions is made outside the kernel tree.

Makefile

@@ -787,12 +787,6 @@ endef
 # make mrproper  Delete the current configuration, and all generated files
 # make distclean Remove editor backup files, patch leftover files and the like
 
-quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
-      cmd_rmdirs = rm -rf $(rm-dirs)
-
-quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
-      cmd_rmfiles = rm -f $(rm-files)
-
 # Directories & files removed with 'make clean'
 CLEAN_DIRS  += $(MODVERDIR)
 CLEAN_FILES +=	vmlinux System.map kernel.spec \
@@ -951,9 +945,12 @@ else # KBUILD_EXTMOD
 
 # We are always building modules
 KBUILD_MODULES := 1
+.PHONY: crmodverdir
+crmodverdir: FORCE
+	$(Q)mkdir -p $(MODVERDIR)
 
 .PHONY: $(KBUILD_EXTMOD)
-$(KBUILD_EXTMOD): FORCE
+$(KBUILD_EXTMOD): crmodverdir FORCE
 	$(Q)$(MAKE) $(build)=$@
 
 .PHONY: modules
@@ -971,7 +968,9 @@ clean-dirs := _clean_$(KBUILD_EXTMOD)
 $(clean-dirs):
 	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
 
+clean:	rm-dirs := $(MODVERDIR)
 clean: $(clean-dirs)
+	$(call cmd,rmdirs)
 	@find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
 	 	\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
 		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
@@ -1058,6 +1057,13 @@ endif #ifeq ($(mixed-targets),1)
 # FIXME Should go into a make.lib or something 
 # ===========================================================================
 
+quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
+      cmd_rmdirs = rm -rf $(rm-dirs)
+
+quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
+      cmd_rmfiles = rm -f $(rm-files)
+
+
 a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
 	  $(NOSTDINC_FLAGS) $(CPPFLAGS) \
 	  $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)

scripts/Makefile.modinst

@@ -12,10 +12,6 @@ include scripts/Makefile.lib
 __modules := $(shell head -q -n1 /dev/null $(wildcard $(MODVERDIR)/*.mod))
 modules := $(patsubst %.o,%.ko,$(wildcard $(__modules:.ko=.o)))
 
-ifneq ($(filter-out $(modules),$(__modules)),)
-  $(warning *** Uh-oh, you have stale module entries. You messed with SUBDIRS, do not complain if something goes wrong.)
-endif
-
 .PHONY: $(modules)
 __modinst: $(modules)
 	@: