linux-2.2.13pre15 stability w/ head.S patch

[David Edelsohn]

	The general, conservative procedure that should be followed for
any BAT change is:

	li	rX, 0
	mtdbatu N, rX
	isync
	mtdbatl N, rL
	mtdbatu N, rU
	isync

I do not see the posted assembly code performing any isync's to prevent
speculation.  mtspr does not produce complete serialization in the
pipeline, and the serialization is implementation-dependent.

David

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