K 10
svn:author
V 5
markj
K 8
svn:date
V 27
2017-05-15T21:44:40.093308Z
K 7
svn:log
V 488
Ensure that profile and tick probes provide a non-zero PC value.

The idle thread may process callouts while reloading the timer in
cpu_activeclock(). In this case, provide a representative value, &cpu_idle,
instead of 0 for args[0] so that the active thread can be more easily
identified from the probe.

This addresses intermittent failures of the profile-n/tst.argtest.d test.

MFC after:	2 weeks
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D10651

END