[PATCH 0/8] tracing vs rcu vs nmi

Peter Zijlstra
2020-02-12T09:43:51Z

Hi all,

These here patches are the result of Mathieu and Steve trying to get commit
865e63b04e9b2 ("tracing: Add back in rcu_irq_enter/exit_irqson() for rcuidle
tracepoints") reverted again.

One of the things discovered is that tracing MUST NOT happen before nmi_enter()
or after nmi_exit(). I've only fixed x86, but quickly gone through other
architectures and there is definitely more stuff to be fixed (simply grep for
nmi_enter in your arch).