Why the mce reverts in 4.16-rt?

[Steven Rostedt]

Hi Sebastian,

I'm looking at backporting patches from 4.16-rt and noticed that you
have:

Revert "x86: Convert mce timer to hrtimer"
Revert "x86/mce: use swait queue for mce wakeups"

With no explanation to why they were reverted. When did things change?
Should this be 4.14-rt material?

Thanks,

-- Steve