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For i386 temporary mappings, unpin the thread before releasing

Description

For i386 temporary mappings, unpin the thread before releasing
the cmap lock. Releasing the lock first may result in the thread
being immediately rescheduled and bound to the same CPU, only to
unpin itself upon resuming execution.

Noted by: skra (in review for armv6 equivalent)
MFC after: 1 week

Details

Provenance
jahAuthored on
Parents
rS312152: One more sys/types.h kevent clarification missed in r312151
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