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Pull up following revision(s) (requested by riastradh in ticket #266):
sys/kern/kern_rwlock.c: revision 1.68
rwlock(9): Fix membars.
rw_downgrade must be a release operation, and rw_tryupgrade must be
an acquire operation. membar_producer is not enough -- need to use
membar_release and membar_acquire.
Discussed on tech-kern:
https://mail-index.netbsd.org/tech-kern/2023/02/22/msg028726.html
sys/kern/kern_rwlock.c: revision 1.68
rwlock(9): Fix membars.
rw_downgrade must be a release operation, and rw_tryupgrade must be
an acquire operation. membar_producer is not enough -- need to use
membar_release and membar_acquire.
Discussed on tech-kern:
https://mail-index.netbsd.org/tech-kern/2023/02/22/msg028726.html