K 10
svn:author
V 6
kevans
K 8
svn:date
V 27
2020-11-17T03:26:56.966554Z
K 7
svn:log
V 249
_umtx_op: document UMTX_OP_SEM2_WAIT copyout behavior

This clever technique to get a time remaining back was added to support sem_clockwait_np.

Reviewed by:	kib, vangyzen
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D27160

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