Sepherosa Ziehau 5fa2e9dd39 hyperv: Use proper fence function to keep store-load order for msgs
sfence only makes sure about the store-store order, which is not
sufficient here.  Use atomic_thread_fence_seq_cst() as suggested
jhb and kib (a locked op in the nutshell, which should have the

Reviewed by:	jhb, kib, Jun Su <junsu microsoft com>
MFC after:	1 week
Sponsored by:	Microsoft OSTC
Differential Revision:	https://reviews.freebsd.org/D5436
2016-02-29 04:58:40 +00:00
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