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Subject: Re: [PATCH] uio: Support 36-bit physical addresses on 32-bit systems
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From: Kumar Gala <galak@kernel.crashing.org>
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Date: Wed, 12 Oct 2011 15:58:08 -0500
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To: "Hans J. Koch" <hjk@hansjkoch.de>
Cc: linuxppc-dev@ozlabs.org, gregkh@suse.de,
 Kai Jiang <Kai.Jiang@freescale.com>, linux-kernel@vger.kernel.org
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On Oct 12, 2011, at 3:23 PM, Hans J. Koch wrote:

> On Wed, Oct 12, 2011 at 01:40:22PM -0500, Kumar Gala wrote:
>>=20
>> On Oct 12, 2011, at 11:19 AM, Hans J. Koch wrote:
>>=20
>>> 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>
>>>>>=20
>>>>> 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.
>>>>>=20
>>>>> 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.
>>>>=20
>>>> No. There's phys_addr_t for that purpose, defined in =
include/linux/types.h.
>>>> Please use that.
>>>=20
>>> I forgot: If you resend this, please update the documentation as =
well.
>>> (Documentation/DocBook/uio-howto.tmpl)
>>=20
>> What would you look added or modified here?
>=20
> struct uio_mem ?
>=20
> Hans

New version sent, let me know if there are any other aspects to the =
DocBook that need updating.

- k=