@@ -148,7 +148,7 @@ deb-pkg srcdeb-pkg bindeb-pkg:
$(if $(findstring source, $(build-type)), \
--unsigned-source --compression=$(KDEB_SOURCE_COMPRESS)) \
$(if $(findstring binary, $(build-type)), \
- --rules-file='$(MAKE) -f debian/rules' -r$(KBUILD_PKG_ROOTCMD) -a$$(cat debian/arch), \
+ --rules-file='$(MAKE) -f debian/rules' --jobs=1 -r$(KBUILD_PKG_ROOTCMD) -a$$(cat debian/arch), \
--no-check-builddeps) \
$(DPKG_FLAGS))
@@ -5,6 +5,11 @@ include debian/rules.vars
srctree ?= .
+ifneq (,$(filter-out parallel=1,$(filter parallel=%,$(DEB_BUILD_OPTIONS))))
+ NUMJOBS = $(patsubst parallel=%,%,$(filter parallel=%,$(DEB_BUILD_OPTIONS)))
+ MAKEFLAGS += -j$(NUMJOBS)
+endif
+
.PHONY: binary binary-indep binary-arch
binary: binary-arch binary-indep
binary-indep: build-indep
'make srcdeb-pkg' generates a source package, which you can build later by using dpkg-buildpackage. In older dpkg versions, 'dpkg-buildpackage --jobs=N' sets not only DEB_BUILD_OPTIONS but also MAKEFLAGS. Hence, passing -j or --jobs to dpkg-buildpackage was enough for parallel execution. The behavior was changed by commit 1d0ea9b2ba3f ("dpkg-buildpackage: Change -j, --jobs semantics to non-force mode") of dpkg project. [1] Since then, 'dpkg-buildpackage --jobs=N' sets only DEB_BUILD_OPTIONS, which is not parsed by the current debian/rules. You cannot parallelly build the generated source package unless you pass the alternative --jobs-force option or set the MAKEFLAGS environment variable. Debian policy [2] suggests the following code snippet for debian/rules. ifneq (,$(filter parallel=%,$(DEB_BUILD_OPTIONS))) NUMJOBS = $(patsubst parallel=%,%,$(filter parallel=%,$(DEB_BUILD_OPTIONS))) MAKEFLAGS += -j$(NUMJOBS) endif I tweaked the code snippet to filter out parallel=1 and pass --jobs=1 to dpkg-buildpackage from scripts/Makefile.package. It is needed to keep 'make deb-pkg' without the -j option running in serial. Please note that dpkg-buildpackage sets parallel=<nproc> in DEB_BUILD_OPTIONS by default (that is, --jobs=auto is the default) and --jobs=1 is needed to restore the serial execution. When dpkg-buildpackage is invoked from Kbuild, the number of jobs is inherited from the top level Makefile. Passing --jobs=1 to dpkg-buildpackage allows debian/rules to skip parsing DEB_BUILD_OPTIONS. [1] https://salsa.debian.org/dpkg-team/dpkg/-/commit/1d0ea9b2ba3f6a2de5b1a6ff55f3df7b71f73db6 [2] https://www.debian.org/doc/debian-policy/ch-source.html#s-debianrules-options Reported-by: Bastian Germann <bage@linutronix.de> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> --- Changes in v2: - Simplify the code and make it work with all Make versions. scripts/Makefile.package | 2 +- scripts/package/debian/rules | 5 +++++ 2 files changed, 6 insertions(+), 1 deletion(-)