K 10
svn:author
V 3
avg
K 8
svn:date
V 27
2018-05-25T07:33:20.550383Z
K 7
svn:log
V 707
re-synchronize TSC-s on SMP systems after resume, if necessary

The TSC-s are checked and synchronized only if they were good
originally.  That is, invariant, synchronized, etc.

This is necessary on an AMD-based system where after a wakeup from STR I
see that BSP clock differs from AP clocks by a count that roughly
corresponds to one second.  The APs are in sync with each other.  Not
sure if this is a hardware quirk or a firmware bug.

This is what I see after a resume with this change:
    SMP: passed TSC synchronization test after adjustment
    acpi_timer0: restoring timecounter, ACPI-fast -> TSC-low

Reviewed by:	kib
MFC after:	3 weeks
Differential Revision: https://reviews.freebsd.org/D15551

END