Ryan Libby 942951ba46 uma dbg: catch more corruption with atomics
Use atomic testandset and testandclear to catch concurrent double free,
and to reduce the number of atomic operations.

Submitted by:	jeff
Reviewed by:	cem, kib, markj (all previous version)
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D22703
2020-12-31 13:02:45 -08:00
..
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