UIO support for >32-bit physical addresses on 32-bit platforms

[Kumar Gala]

Hans, Greg,

We are looking at using UIO for some driver work and noticed it assumes the address for MMIO regions is an 'unsigned long'.  This is a problem for the platforms we have in which we support a 36-bit physical address in a 32-bit machine.

Should we just change addr/size in struct uio_mem to u64 always?  At first I was thinking phys_addr_t but realized the addr could be PHYS, LOGICAL, or VIRTUAL.

- k

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