Re: Athlon/AGP issue update

[Momchil Velikov]

>>>>> "David" == David S Miller <[e-mail]> writes:
David> 4MB pages map the GART pages and "other stuff", ie. memory used by
David> other subsystems, user pages and whatever else.  This is the only
David> way the bug can be thus triggered for kernel mappings, which is why
David> turning off 4MB pages fixes this part.

Erm, why would the granularity of mapping matter at all ? Or, for that
matter, the very existanse of address translation ?

David> The only unresolved bit is the fact that we map these GART pages
David> cacheable into user space.  That ought to cause the problem too.

They're mapped with 4KB pages too, right ? What makes it diferent to
4KB kernel mappings ?