K 10
svn:author
V 3
jhb
K 8
svn:date
V 27
2016-10-01T22:12:33.967125Z
K 7
svn:log
V 574
Use timercmp() and timersub() in kdump.

Previously, kdump used the kernel-only timervalsub() macro which required
defining _KERNEL when including <sys/time.h>.  Now, kdump uses the existing
userland API.  The timercmp() usage to check for a backwards timestamp is
also clearer and simpler than the previous code which checked the result of
the subtraction for a negative value.

While here, take advantage of the 3-arg timersub() to store the subtraction
results in a tempory timeval instead of overwriting the timestamp in the
ktrace record and then having to restore it.

END