[Bug 229106] intr_event_handle is unsafe with respect to interrupt handler list

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229106

--- Comment #8 from Andriy Gapon <avg at FreeBSD.org> ---
(In reply to Conrad Meyer from comment #7)
I don't know epoch(9) / ck_epoch implementation details, but given the
constraints[*] of interrupt handling, I think that it could be an overkill.  I
mean, it probably has some overhead that's avoidable.  And for that latency
sensitive code it could matter.

[*] The interrupt handler list can be iterated only by a single thread /
context at a time.  Also, we reduce modifications to a single thread at a time
using a mutex.  Performance of adding and removing interrupt handlers is not
critical.

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