Zbigniew Bodek 458f2175ca Add options to dmb() and dsb() macros on ARM64
Using plain dsb()/dmb() as full system barriers is usually to much.
Adding proper options to those barriers (instead of full system - sy)
will most likely reduce the cost of the instructions and will benefit
in performance improvement.
This commit adds options to barrier macro definitions.

Obtained from: Semihalf
Reviewed by:   andrew, ian
Sponsored by:  The FreeBSD Foundation
2015-06-09 23:54:20 +00:00
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