Use rpm-provided flags for make -jN

Makefile

@@ -18,8 +18,7 @@ RPM_DEFINES := --define "_sourcedir $(SOURCEDIR)" \
 		--define "_builddir $(BUILDDIR)" \
 		--define "_srcrpmdir $(SRCRPMDIR)" \
 		--define "_rpmdir $(RPMDIR)" \
-		--define "build_flavor $(BUILD_FLAVOR)" \
-		--define "jobs $(NO_OF_CPUS)"
+		--define "build_flavor $(BUILD_FLAVOR)"
 
 VER_REL := $(shell rpm $(RPM_DEFINES) -q --qf "%{VERSION} %{RELEASE}\n" --specfile $(SPECFILE)| head -1)
 

kernel.spec

@@ -150,14 +150,7 @@ find . ! -type d -printf '%%P\n' > %my_builddir/obj-files
 
 cd %kernel_build_dir
 
-# If the %jobs macro is defined to a number, make will spawn that many jobs.
-# There are several ways how to define it:
-# With plain rpmbuild:
-#     rpmbuild -ba --define 'jobs N' kernel-$flavor.spec
-# To spawn as many jobs as there are cpu cores:
-#     rpmbuild -ba --define "jobs 0$(grep -c ^processor /proc/cpuinfo)" \
-#         kernel-$flavor.spec
-make %{?jobs:-j%jobs} all $MAKE_ARGS CONFIG_DEBUG_SECTION_MISMATCH=y
+make %{?_smp_mflags} all $MAKE_ARGS CONFIG_DEBUG_SECTION_MISMATCH=y
 
 # Build u2mfn module
 make -C %kernel_build_dir SUBDIRS=%_builddir/u2mfn modules