[PATCH v2 0/5] kcov: PREEMPT_RT fixup + misc

[Sebastian Andrzej Siewior]

This is a repost of my initial series [0] with collected tags. 

The last patch in series is follow-up to address the PREEMPT_RT issue
within in kcov reported by Clark [1].
Patches 1-3 are smaller things that I noticed while staring at it.
Patch 4 is small change which makes replacement in #5 simpler / more
obvious.
I tested this with the snippets in examples, Marco Elver used to run syzkaller
for a few hours.

[0] https://lkml.kernel.org/r/20210830172627.267989-1-bigeasy@xxxxxxxxxxxxx
[1] https://lkml.kernel.org/r/20210809155909.333073de@xxxxxxxxxxx