On Fri, 2008-10-24 at 14:24 +1100, Benjamin Herrenschmidt wrote:

> I'm not that fan of carrying a mapping with a struct resource because if
> we do that we should probably also refcount the mapping, and then there
> is the whole question of mappings with different attributes, etc etc...

I'm fine with sticking the mapping in a separate structure; it's just
the return from ioremap_wc on 64-bit systems, and nothing at all on
32-bit systems. I don't really see the advantage of moving it into the
resource, especially as we may need different access modes (UC vs WC)
for different portions of a single BAR.

We may want to add some bounds and access mode information to this
structure to check for broken drivers.

-- 
keith.packard@intel.com