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SubjectRe: [PATCH] uio: Support 36-bit physical addresses on 32-bit systems
On Wed, Oct 12, 2011 at 01:40:22PM -0500, Kumar Gala wrote:
>
> On Oct 12, 2011, at 11:19 AM, Hans J. Koch wrote:
>
> > On Wed, Oct 12, 2011 at 05:32:29PM +0200, Hans J. Koch wrote:
> >> On Wed, Oct 12, 2011 at 09:35:45AM -0500, Kumar Gala wrote:
> >>> From: Kai Jiang <Kai.Jiang@freescale.com>
> >>>
> >>> 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 'unsigned long long'
> >>> regardless of which type is utilized.
> >>
> >> No. There's phys_addr_t for that purpose, defined in include/linux/types.h.
> >> Please use that.
> >
> > I forgot: If you resend this, please update the documentation as well.
> > (Documentation/DocBook/uio-howto.tmpl)
>
> What would you look added or modified here?

struct uio_mem ?

Hans

>
> - k


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