To RETpoline or not to RETpoline

Wed Dec 4 13:45:26 UTC 2019

Hello.

In a few days I'll be upgrading an 11.3/amd64 installation to 12.1 via 
sources.

While 11.3 had the WITH_KERNEL_RETPOLINE macro, 12.0 also adds 
WITH_RETPOLINE (for userland). AFAICT these are not enabled by default.

Should I use them?
Are they experimental or ready for production use?
Must they be used together?
Is there something similar for ports and/or Poudriere?

If any/all of the above are set, is there still any point in keeping 
hw.ibrs_disable=0?

Other things I've missed?

  bye & Thanks
	av.