From: Thomas Gleixner <redacted>
Date: Fri, 14 Feb 2020 14:39:17 +0100

This is a follow up to the initial patch series which David posted a
while ago:

 https://lore.kernel.org/bpf/20191207.160357.828344895192682546.davem@davemloft.net/ (local)

which was (while non-functional on RT) a good starting point for further
investigations.

This looks really good after a cursory review, thanks for doing this week.

I was personally unaware of the pre-allocation rules for MAPs used by
tracing et al.  And that definitely shapes how this should be handled.