[PATCH v2] kbuild: deb-pkg: support DEB_BUILD_OPTIONS=parallel=N in debian/rules

[Masahiro Yamada <masahiroy@kernel.org>]

'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(-)

diff --git a/scripts/Makefile.package b/scripts/Makefile.package
index f8a948ec2c6b..2bcab02da965 100644
--- a/scripts/Makefile.package
+++ b/scripts/Makefile.package
@@ -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))
 
diff --git a/scripts/package/debian/rules b/scripts/package/debian/rules
index 226e127efd63..3dafa9496c63 100755
--- a/scripts/package/debian/rules
+++ b/scripts/package/debian/rules
@@ -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
-- 
2.39.2