K 10
svn:author
V 3
cem
K 8
svn:date
V 27
2019-11-22T23:23:40.846062Z
K 7
svn:log
V 521
Add explicit SI_SUB_EPOCH

Add explicit SI_SUB_EPOCH, after SI_SUB_TASKQ and before SI_SUB_SMP
(EARLY_AP_STARTUP).  Rename existing "SI_SUB_TASKQ + 1" to SI_SUB_EPOCH.

epoch(9) consumers cannot epoch_alloc() before SI_SUB_EPOCH:SI_ORDER_SECOND,
but likely should allocate before SI_SUB_SMP.  Prior to this change,
consumers (well, epoch itself, and net/if.c) just open-coded the
SI_SUB_TASKQ + 1 order to match epoch.c, but this was fragile.

Reviewed by:	mmacy
Differential Revision:	https://reviews.freebsd.org/D22503

END