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Test PGA_REFERENCED after calling pmap_ts_referenced(), rather than before,

Description

Test PGA_REFERENCED after calling pmap_ts_referenced(), rather than before,
so that a reference from a concurrently destroyed mapping is observed
during the current scan.

Reviewed by: kib, markj
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D16277

Details

Provenance
alcAuthored on
Reviewer
kib
Differential Revision
D16277: Reorder PGA_REFERENCED and pmap_ts_referenced()
Parents
rS336313: Assorted TSO fixes for em(4)/iflib(9) and dead code removal:
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