On Fri, 5 Aug 2016 17:40:43 +0200
Sebastian Andrzej Siewior [off-list ref] wrote:

quoted

Ah, this is when we have GENERIC_SCHED_CLOCK, which would break tracing
if any arch that has this also has NMIs. Probably need to look at arm64.  

arm64 should use the generic code as they don't provide sched_clock()
(and I doubt they go for the weak jiffy version).

And I'm guessing that arm64 supports NMIs. Is there no NMI safe clock?
I probably need to look at the tracing code. Because you can have the
same issue while tracing in an NMI as well.

-- Steve