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[Xen-devel] [PATCHv2 0/4] spinlock: queue read-write locks

This series replaces the current read-write lock implementation with
the queue read-write locks 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.

Significant changes in v2:

- atomic_cmpxchg() is now arch-dependent as arm/arm64 already provided
  their own.
- Moved rwlocks into their own file.
- Removed the special casing of in_irq() in the slow read path.


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