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kern_sharedpage.c: Add exec_sysvec_init_secondary() helper.

Description

kern_sharedpage.c: Add exec_sysvec_init_secondary() helper.

It allows a sysent to share existing usermode data in shared page with
other sysent, assuming ABI differences are not in the layout of the
page.

Tested by: pho
Sponsored by: The FreeBSD Foundation
Differential revision: https://reviews.freebsd.org/D25273

Details

Provenance
kibAuthored on
Differential Revision
D25273: amd64 pmap: LA57 AKA 5-level paging
Parents
rS364512: MFC r352209 by emaste:
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