Re: [patch] Make MMCONFIG space (extended PCI config space) a driver opt-in issue

Benjamin Herrenschmidt
2007-12-23T23:34:16Z

> I've occasionally wondered if that spinlock needs to get split up, but
> for the amount of pain that could ensue, I can't imagine it ever being
> worthwhile.

Wondered the same thing and decided against it. I do have every now and
then some really crazy cases to deal with. One of them is the need to
use something like fixmap/kmap_atomic because a vendors makes 32 bits
CPUs that need 512MB of address space to map config space :-)

Ben.