linux-kernel - Re: [PATCH] uio: Support 36-bit physical addresses on 32-bit systems

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Message-ID: <20111012202332.GG21852@local>
Date:	Wed, 12 Oct 2011 22:23:32 +0200
From:	"Hans J. Koch" <hjk@...sjkoch.de>
To:	Kumar Gala <galak@...nel.crashing.org>
Cc:	"Hans J. Koch" <hjk@...sjkoch.de>, gregkh@...e.de,
	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org,
	Kai Jiang <Kai.Jiang@...escale.com>
Subject: Re: [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@...escale.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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