On Fri, Oct 14, 2011 at 08:31:45PM +0200, Hans J. Koch wrote:

On Thu, Oct 13, 2011 at 10:50:58AM -0500, Kumar Gala wrote:

quoted

From: Kai Jiang <redacted>

To support >32-bit physical addresses for UIO_MEM_PHYS type we need to
extend the width of 'addr' in struct uio_mem.  Numerous platforms like
embedded PPC, ARM, and X86 have support for systems with larger physical
address than logical.

Since 'addr' may contain a physical, logical, or virtual address the
easiest solution is to just change the type to 'phys_addr_t' which
should always be greater than or equal to the sizeof(void *) such that
it can properly hold any of the address types.

For physical address we can support up to a 44-bit physical address on a
typical 32-bit system as we utilize remap_pfn_range() for the mapping of
the memory region and pfn's are represnted by shifting the address by
the page size (typically 4k).

Signed-off-by: Kai Jiang <redacted>
Signed-off-by: Minghuan Lian <redacted>
Signed-off-by: Kumar Gala <redacted>

Signed-off-by: "Hans J. Koch" <redacted>

That looks good to me. There's an unnecessary cast (see below), but I fixed that
on the way.

Greg, please pull this from branch uio-for-gregkh from

git://hansjkoch.de/git/linux-hjk

Care to send it as an email?  I can apply it easier that way as I have
limited internet access while on the road.

greg k-h