Konstantin Belousov 70a3efc14f Do not use atomic_swap_int(9), it is not available on all
architectures.  Atomic_cmpset_int(9) is a direct replacement, due to
loop.  The change fixes arm, arm64, mips an sparc64, which lack
atomic_swap().

Suggested and reviewed by:	alc
Sponsored by:	The FreeBSD Foundation
MFC after:	2 weeks
2015-07-15 21:44:16 +00:00
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