missing device node for CPU? But it still works

[microaaron]

I compiled the kernel with bcm2709_defconfig. But when I boot the RPi2 with the new kernel, It appeared:
[ 0.053394] missing device node for CPU 0
[ 0.053470] missing device node for CPU 1
[ 0.053498] missing device node for CPU 2
[ 0.053525] missing device node for CPU 3
But it looks still works. It still can enter the desktop.
I found this kernel I build is smaller than another kernel in github.com/raspberrypi/firmware, that kernel won't miss device node for CPU.
So I guess that kernel was compiled with a different config. But how to config the kernel to let it not missing device node for CPU?

[popcornmix]

First did you follow: https://www.raspberrypi.org/documentation/linux/kernel/building.md ?
That should produce a kernel with same behaviour as one from firmware repo.

[microaaron]

Thanks for your help. I followed the way and tried again. But it still happeded.

[popcornmix]

Are you using the rpi-4.1.y tree?
what does knlinfo kernel.img report?
Is device-tree present when you have booted (i.e. does /proc/device-tree exist)?

[microaaron]

Sorry, I forgot to mkknlimg the zImage, so knlinfo report no trailer. Thank you. 😄