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git2svn
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2022-02-22T07:30:50.712382Z
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V 594
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.

(cherry picked from commit 7993a104a10c81e4049e5923061d9bb7a5e35d80)

Git Hash:   c4756f4a7abd284b9beb732e734d62706c7cf352
Git Author: cem@FreeBSD.org
END