kbuild: deb-pkg: hide KDEB_SOURCENAME from Makefile

scripts/Makefile.package does not need to know the value of
KDEB_SOURCENAME because the source name can be taken from
debian/changelog by using dpkg-parsechangelog.

Move the default of KDEB_SOURCENAME (i.e. linux-upstream) to
scripts/package/mkdebian.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>

scripts/Makefile.package

@@ -4,9 +4,7 @@
 include $(srctree)/scripts/Kbuild.include
 
 KERNELPATH := kernel-$(subst -,_,$(KERNELRELEASE))
-KDEB_SOURCENAME ?= linux-upstream
 KBUILD_PKG_ROOTCMD ?="fakeroot -u"
-export KDEB_SOURCENAME
 # Include only those top-level files that are needed by make, plus the GPL copy
 TAR_CONTENT := Documentation LICENSES arch block certs crypto drivers fs \
                include init io_uring ipc kernel lib mm net rust \
@@ -87,17 +85,26 @@ binrpm-pkg:
 	+rpmbuild $(RPMOPTS) --define "_builddir $(objtree)" --target \
 		$(UTS_MACHINE)-linux -bb $(objtree)/binkernel.spec
 
+quiet_cmd_debianize = GEN     $@
+      cmd_debianize = $(srctree)/scripts/package/mkdebian
+
+debian: FORCE
+	$(call cmd,debianize)
+
+PHONY += debian-orig
+debian-orig: private source = $(shell dpkg-parsechangelog -S Source)
+debian-orig: private version = $(shell dpkg-parsechangelog -S Version | sed 's/-[^-]*$$//')
+debian-orig: private orig-name = $(source)_$(version).orig.tar.gz
+debian-orig: linux.tar.gz debian
+	$(Q)cp $< ../$(orig-name)
+
 PHONY += deb-pkg
-deb-pkg: linux.tar.gz
-	$(CONFIG_SHELL) $(srctree)/scripts/package/mkdebian
-	origversion=$$(dpkg-parsechangelog -SVersion |sed 's/-[^-]*$$//');\
-		cp linux.tar.gz ../$(KDEB_SOURCENAME)_$${origversion}.orig.tar.gz
+deb-pkg: debian-orig
 	+dpkg-buildpackage -r$(KBUILD_PKG_ROOTCMD) -a$$(cat debian/arch) $(DPKG_FLAGS) \
 		--build=source,binary --source-option=-sP -nc -us -uc
 
 PHONY += bindeb-pkg
-bindeb-pkg:
-	$(CONFIG_SHELL) $(srctree)/scripts/package/mkdebian
+bindeb-pkg: debian
 	+dpkg-buildpackage -r$(KBUILD_PKG_ROOTCMD) -a$$(cat debian/arch) $(DPKG_FLAGS) -b -nc -uc
 
 PHONY += intdeb-pkg

scripts/package/mkdebian

@@ -95,7 +95,7 @@ else
 	revision=$($srctree/init/build-version)
 	packageversion=$version-$revision
 fi
-sourcename=$KDEB_SOURCENAME
+sourcename=${KDEB_SOURCENAME:-linux-upstream}
 
 if [ "$ARCH" = "um" ] ; then
 	packagename=user-mode-linux