kbuild: Add make tarzst-pkg build option

Add tarzst-pkg and perf-tarzst-src-pkg targets to build zstd compressed
tarballs.
Signed-off-by: Paweł Jasiak <pawel@jasiak.dev>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

scripts/Makefile.package

@@ -103,7 +103,7 @@ snap-pkg:
 
 # tarball targets
 # ---------------------------------------------------------------------------
-tar-pkgs := dir-pkg tar-pkg targz-pkg tarbz2-pkg tarxz-pkg
+tar-pkgs := dir-pkg tar-pkg targz-pkg tarbz2-pkg tarxz-pkg tarzst-pkg
 PHONY += $(tar-pkgs)
 $(tar-pkgs):
 	$(MAKE) -f $(srctree)/Makefile
@@ -130,10 +130,12 @@ $(if $(findstring tar-src,$@),,                                     \
 $(if $(findstring bz2,$@),$(KBZIP2),                                 \
 $(if $(findstring gz,$@),$(KGZIP),                                  \
 $(if $(findstring xz,$@),$(XZ),                                     \
-$(error unknown target $@))))                                       \
+$(if $(findstring zst,$@),$(ZSTD),                                  \
+$(error unknown target $@)))))                                      \
 	-f -9 $(perf-tar).tar)
 
-perf-tar-pkgs := perf-tar-src-pkg perf-targz-src-pkg perf-tarbz2-src-pkg perf-tarxz-src-pkg
+perf-tar-pkgs := perf-tar-src-pkg perf-targz-src-pkg perf-tarbz2-src-pkg \
+		 perf-tarxz-src-pkg perf-tarzst-src-pkg
 PHONY += $(perf-tar-pkgs)
 $(perf-tar-pkgs):
 	$(call cmd,perf_tar)
@@ -153,9 +155,11 @@ help:
 	@echo '  targz-pkg           - Build the kernel as a gzip compressed tarball'
 	@echo '  tarbz2-pkg          - Build the kernel as a bzip2 compressed tarball'
 	@echo '  tarxz-pkg           - Build the kernel as a xz compressed tarball'
+	@echo '  tarzst-pkg          - Build the kernel as a zstd compressed tarball'
 	@echo '  perf-tar-src-pkg    - Build $(perf-tar).tar source tarball'
 	@echo '  perf-targz-src-pkg  - Build $(perf-tar).tar.gz source tarball'
 	@echo '  perf-tarbz2-src-pkg - Build $(perf-tar).tar.bz2 source tarball'
 	@echo '  perf-tarxz-src-pkg  - Build $(perf-tar).tar.xz source tarball'
+	@echo '  perf-tarzst-src-pkg - Build $(perf-tar).tar.zst source tarball'
 
 .PHONY: $(PHONY)

scripts/package/buildtar

@@ -39,6 +39,10 @@ case "${1}" in
 		opts="-I ${XZ}"
 		tarball=${tarball}.xz
 		;;
+	tarzst-pkg)
+		opts="-I ${ZSTD}"
+		tarball=${tarball}.zst
+		;;
 	*)
 		echo "Unknown tarball target \"${1}\" requested, please add it to ${0}." >&2
 		exit 1