[RFC] Remove AGP support from Radeon/Nouveau/TTM

[Rui Salvaterra]

On Wed, 13 May 2020 at 11:27, Michel Dänzer <michel at daenzer.net> wrote:
>
> The only theoretical problem there was that the kernel still had a
> cacheable mapping of the same memory, and any access via that (e.g.
> prefetch due to access to a neighbouring page) could trigger a machine
> check. But I don't remember ever hitting that. Maybe I was just lucky
> all those years.

If that's the issue, I assure you nowadays you can hit it quite
reliably, at least on my iBook G4. (Which, by the way is also hanging
randomly on 5.7-rc5, for apparently unrelated reasons; I haven't
bisected yet, but fortunately I can do it on the G5 while keeping
what's left of my sanity.)