dcache BUG()

[Brian Kuschak]

> What can happen is a lwarx to an address, in some other context a
> simple store to that address (no reservation broken) then a subsequent
> stwcx. to the address will appear successful.  Hmmmm.....several
> ways to fix it, I wonder what will work best.....

Yes, this sounds bad.  However, I wonder if it's really the cause of this
particular bug.  I cannot find any code which does a regular store to the
d_count variables.  All writes to these counters appear to use the atomic
ops.

Brian

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