RAID6 on PowerPC is faulty

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If you have been running RAID6 on a PowerPC with Altivec, your RAID is
not two-disk redundant, due to bad Q syndrome computation.

It *is* one-disk redundant, however.

The following patch will fix it:

http://www.kernel.org/pub/linux/kernel/people/hpa/raid6-altivec-fix.patch

.. however, it will not correct an existing array without rewriting
every stripe.

Neil, is there any way to force md to recompute all the syndromes?

	-hpa
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