Linux Kernel 4.18.8

[Yoast]

The corresponding value (CONFIG_NR_CPUS=4) can be found via menuconfig under Kernel Features --> Maximum number of CPUs.

I will change this to 6, recompile and see what happens.

Mine is 64 - never seen the message .

Then again, as I am aiming for small kernel, may as well reduce to 8 in case it makes any difference.

I think that a value higher than the actual number of cores is no problem (and you will not see a message). But if it's lower then clipping occurs (as you can see in the message) and maybe some of the cores will not be used. There were a couple of call traces in the boot log as well and they disappeared when I changed this value to 6.