Do we need tlbsx at finish_tlb_load?

[David Gibson <david@gibson.dropbear.id.au>]

A question to Dan and Tom in particular:

At the moment on 4xx, just after finish_tlb_load, which is called by
both the TLB miss handlers, we do a tlbsx to see if an entry for this
virtual address already exists.

Since this code is only called from the TLB miss handler, I can't see
how there could ever be a valid TLB entry present at this point.
There is a comment claiming that this path can be hit under some
circumstances, but it doesn't make sense to me.

Is there any situation where we can reach this point with a valid TLB
entry existing for the faulting address?

--
David Gibson			| For every complex problem there is a
david@gibson.dropbear.id.au	| solution which is simple, neat and
				| wrong.  -- H.L. Mencken
http://www.ozlabs.org/people/dgibson

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