Re: [PATCH] (Longhaul 1/5) PCI: Protect bus master DMA from Longhaul by rw semaphores

Jeremy Fitzhardinge
2006-06-28T18:00:23Z

Alan Cox wrote:
> I am still not clear if this is just cache corruption through us not
> listening or whether we genuinely need to halt.
Especially buggy steppings of C3s would stop snooping while in 'hlt', so
it wouldn't surprise me if they stopped while doing a speed transition.

> In the former case
> flushing and disabling the CPU caches ought to be sufficient.
>
Sounds reasonable, unless that causes problems of its own. (My general
experience with Via CPUs is that doing anything even slightly unusual
will result in strange behaviour or outright buggyness.)

J