build pve kernel parallel

[efeu]

How do you build pve kernel in parallel?
The -j flag on make ist completly ignored and building the kernel on a low clocked 32core epyc takes like forever (but well, could use 64 threads instead, which should speedup build times enormously)

 

[efeu]

Then after about 3 hours of build, it aborts with the following error(s) ....

# Autogenerate blacklist for watchdog devices (see README)
install -m 0755 -d debian/pve-kernel-5.4.41-1-pve/lib/modprobe.d
ls debian/pve-kernel-5.4.41-1-pve/lib/modules/5.4.41-1-pve/kernel/drivers/watchdog/ > watchdog-blacklist.tmp
ls: cannot access 'debian/pve-kernel-5.4.41-1-pve/lib/modules/5.4.41-1-pve/kernel/drivers/watchdog/': No such file or directory
make[1]: *** [debian/rules:137: .install_mark] Error 2
make[1]: Leaving directory '/ssdpool/kernel_build/pve-kernel/build'
dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2
make: *** [Makefile:58: pve-kernel-5.4.41-1-pve_5.4.41-1_amd64.deb] Error 2