[PATCH 1/6] perf/core: Provide a kernel-internal interface to get to performance counters

[Paul Mackerras]

Frederic Weisbecker writes:

>  /*
> + * perf_event_create_kernel_counter
> + * MUST be called from a kernel thread.

Why?  The reason for this requirement isn't obvious to me.  It would
be good to have the reason documented in the comment for the sake of
people modifying the code in future.

Paul.
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