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[Xen-devel] [PATCHv1 0/4] spinlock: add qrwlocks

This series adds the qrwlocks from Linux.  These are fair; under
contention both readers and writers will be queued and obtain the lock
in FIFO order (due to the fairness of the internal ticket lock).

The implementation is all in C and thus architecture independent.

Compared to the Linux implementation some of the memory barrier
primitives were changed.  The ARM maintainers may want to give this
area a careful review.


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