K 10
svn:author
V 5
markj
K 8
svn:date
V 27
2016-03-08T00:43:03.909639Z
K 7
svn:log
V 632
Fix fasttrap tracepoint locking.

Upstream, tracepoints are protected by per-CPU mutexes. An unlinked
tracepoint may be freed once all the tracepoint mutexes have been acquired
and released - this is done in fasttrap_mod_barrier(). This mechanism was
not properly ported: in some places, the proc lock is used in place of a
tracepoint lock, and in others the locking is omitted entirely. This change
implements tracepoint locking with an rmlock, where the read lock is used
in fasttrap probe context. As a side effect, this fixes a recursion on the
proc lock when the raise action is used from a userland probe.

MFC after:	1 month

END