On 3/29/2012 1:23 PM, Arnd Bergmann wrote:

That should not really be a concern, you only waste a little bit of
the vmalloc space that you gained recently when ioremap was changed.
Nothing should ever be able to get to those pointers other than by
calling ioremap, so it doesn't hurt to have them mapped, except for
the very unlikely scenario that you get a wild pointer dereference
in the kernel that would otherwise result in an oops.

Ok. I will create two 16M mappings for now:

PHYSICAL			VIRTUAL
0xD0000000 - 0xD1000000		0xFD000000
0xFC000000 - 0xFD000000		0xFC000000


-- 
viresh