Konstantin Belousov e2494f7561 atomic: add atomic_interrupt_fence()
with the semantic following C11 signal_fence, that is, it establishes
ordering between its place and any interrupt handler executing on the
same CPU.

Reviewed by:	markj, mjg, rlibby
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D28909
2021-02-24 22:45:24 +02:00
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