kevans 9851e82342 Provide generic sub-word atomic *cmpset
Provide *cmpset_{8,16} as wrappers around atomic_fcmpset_32. Initial users
will be mips and sparc64, and perhaps parts of powerpc.

This are not for general consumption; machine/atomic.h should include this
header as needed to provide atomic_{,f}cmpset_{8,16} and machine/atomic.h
should provide acq_ and rel_ variants.

Reviewed by:	jhibbits, kib
Differential Revision:	https://reviews.freebsd.org/D21822
2019-10-02 17:06:28 +00:00
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