From: "Hans J. Koch" <hjk@hansjkoch.de>
To: Kumar Gala <galak@kernel.crashing.org>
Cc: linuxppc-dev@ozlabs.org, "Hans J. Koch" <hjk@hansjkoch.de>,
Kai Jiang <Kai.Jiang@freescale.com>,
gregkh@suse.de, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] uio: Support 36-bit physical addresses on 32-bit systems
Date: Wed, 12 Oct 2011 18:16:35 +0200 [thread overview]
Message-ID: <20111012161635.GD21852@local> (raw)
In-Reply-To: <AD39F4F8-E9C0-4090-9AEA-644F82DD328B@kernel.crashing.org>
On Wed, Oct 12, 2011 at 11:07:09AM -0500, Kumar Gala wrote:
>
> On Oct 12, 2011, at 10:32 AM, 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.
>
> Do we believe phys_addr_t is always greater than or equal to size need for logical & virtual addresses?
Yes.
Hans
WARNING: multiple messages have this Message-ID (diff)
From: "Hans J. Koch" <hjk@hansjkoch.de>
To: Kumar Gala <galak@kernel.crashing.org>
Cc: "Hans J. Koch" <hjk@hansjkoch.de>,
gregkh@suse.de, linuxppc-dev@ozlabs.org,
linux-kernel@vger.kernel.org, Kai Jiang <Kai.Jiang@freescale.com>
Subject: Re: [PATCH] uio: Support 36-bit physical addresses on 32-bit systems
Date: Wed, 12 Oct 2011 18:16:35 +0200 [thread overview]
Message-ID: <20111012161635.GD21852@local> (raw)
In-Reply-To: <AD39F4F8-E9C0-4090-9AEA-644F82DD328B@kernel.crashing.org>
On Wed, Oct 12, 2011 at 11:07:09AM -0500, Kumar Gala wrote:
>
> On Oct 12, 2011, at 10:32 AM, 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.
>
> Do we believe phys_addr_t is always greater than or equal to size need for logical & virtual addresses?
Yes.
Hans
next prev parent reply other threads:[~2011-10-12 16:16 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-12 14:35 [PATCH] uio: Support 36-bit physical addresses on 32-bit systems Kumar Gala
2011-10-12 14:35 ` Kumar Gala
2011-10-12 15:32 ` Hans J. Koch
2011-10-12 15:32 ` Hans J. Koch
2011-10-12 16:07 ` Kumar Gala
2011-10-12 16:07 ` Kumar Gala
2011-10-12 16:15 ` Geert Uytterhoeven
2011-10-12 16:15 ` Geert Uytterhoeven
2011-10-13 14:10 ` Tabi Timur-B04825
2011-10-13 14:10 ` Tabi Timur-B04825
2011-10-13 14:25 ` Geert Uytterhoeven
2011-10-13 14:25 ` Geert Uytterhoeven
2011-10-13 14:35 ` Timur Tabi
2011-10-13 14:35 ` Timur Tabi
2011-10-12 16:16 ` Hans J. Koch [this message]
2011-10-12 16:16 ` Hans J. Koch
2011-10-12 16:19 ` Hans J. Koch
2011-10-12 16:19 ` Hans J. Koch
2011-10-12 18:40 ` Kumar Gala
2011-10-12 18:40 ` Kumar Gala
2011-10-12 20:23 ` Hans J. Koch
2011-10-12 20:23 ` Hans J. Koch
2011-10-12 20:58 ` Kumar Gala
2011-10-12 20:58 ` Kumar Gala
-- strict thread matches above, loose matches on Subject: below --
2011-10-13 15:50 Kumar Gala
2011-10-13 15:50 ` Kumar Gala
2011-10-14 18:31 ` Hans J. Koch
2011-10-14 18:31 ` Hans J. Koch
2011-10-14 18:36 ` Greg KH
2011-10-14 18:36 ` Greg KH
2011-10-14 18:46 ` Hans J. Koch
2011-10-14 18:46 ` Hans J. Koch
2011-10-17 16:00 ` Kumar Gala
2011-10-17 16:00 ` Kumar Gala
2011-10-17 17:18 ` Hans J. Koch
2011-10-17 17:18 ` Hans J. Koch
2011-10-17 18:03 ` Hans J. Koch
2011-10-17 18:03 ` Hans J. Koch
2011-10-17 18:23 ` Greg KH
2011-10-17 18:23 ` Greg KH
2011-10-17 18:50 ` Hans J. Koch
2011-10-17 18:50 ` Hans J. Koch
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