From: tsbogend@alpha.franken.de (Thomas Bogendoerfer)
To: Dave Hansen <dave@linux.vnet.ibm.com>
Cc: C Michael Sundius <Michael.sundius@sciatl.com>,
linux-mm@kvack.org, linux-mips@linux-mips.org,
jfraser@broadcom.com, Andy Whitcroft <apw@shadowen.org>
Subject: Re: sparsemem support for mips with highmem
Date: Fri, 15 Aug 2008 18:30:20 +0200 [thread overview]
Message-ID: <20080815163020.GA9554@alpha.franken.de> (raw)
In-Reply-To: <1218815299.23641.80.camel@nimitz>
On Fri, Aug 15, 2008 at 08:48:19AM -0700, Dave Hansen wrote:
> My guess would be that Michael knew that his 32-bit MIPS platform only
> ever has 2GB of memory.
that's the point, which isn't quite correct. It's possible for
a 32bit MIPS system to address 4GB of memory (minus IO). That's
one case where the 31bits don't fit, the other case is a 64bit CPU
running a 32 bit kernel (CONFIG_64BIT selects whether it's a 32bit or
64bit kernel). I'm not whether it's worth to cover both cases, but it's
more restrictive than it's without that change.
Thomas.
--
Crap can work. Given enough thrust pigs will fly, but it's not necessary a
good idea. [ RFC1925, 2.3 ]
WARNING: multiple messages have this Message-ID (diff)
From: tsbogend@alpha.franken.de (Thomas Bogendoerfer)
To: Dave Hansen <dave@linux.vnet.ibm.com>
Cc: C Michael Sundius <Michael.sundius@sciatl.com>,
linux-mm@kvack.org, linux-mips@linux-mips.org,
jfraser@broadcom.com, Andy Whitcroft <apw@shadowen.org>
Subject: Re: sparsemem support for mips with highmem
Date: Fri, 15 Aug 2008 18:30:20 +0200 [thread overview]
Message-ID: <20080815163020.GA9554@alpha.franken.de> (raw)
In-Reply-To: <1218815299.23641.80.camel@nimitz>
On Fri, Aug 15, 2008 at 08:48:19AM -0700, Dave Hansen wrote:
> My guess would be that Michael knew that his 32-bit MIPS platform only
> ever has 2GB of memory.
that's the point, which isn't quite correct. It's possible for
a 32bit MIPS system to address 4GB of memory (minus IO). That's
one case where the 31bits don't fit, the other case is a 64bit CPU
running a 32 bit kernel (CONFIG_64BIT selects whether it's a 32bit or
64bit kernel). I'm not whether it's worth to cover both cases, but it's
more restrictive than it's without that change.
Thomas.
--
Crap can work. Given enough thrust pigs will fly, but it's not necessary a
good idea. [ RFC1925, 2.3 ]
--
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next prev parent reply other threads:[~2008-08-15 16:31 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-14 22:05 sparsemem support for mips with highmem C Michael Sundius
2008-08-14 22:35 ` Dave Hansen
2008-08-14 22:35 ` Dave Hansen
2008-08-14 23:16 ` C Michael Sundius
2008-08-14 23:16 ` C Michael Sundius
2008-08-14 23:52 ` C Michael Sundius
2008-08-15 0:02 ` Dave Hansen
2008-08-15 0:02 ` Dave Hansen
2008-08-15 8:03 ` Thomas Bogendoerfer
2008-08-15 8:03 ` Thomas Bogendoerfer
2008-08-15 15:48 ` Dave Hansen
2008-08-15 15:48 ` Dave Hansen
2008-08-15 16:12 ` C Michael Sundius
2008-08-15 16:12 ` C Michael Sundius
2008-08-15 16:20 ` Dave Hansen
2008-08-15 16:20 ` Dave Hansen
2008-08-15 16:33 ` Thomas Bogendoerfer
2008-08-15 16:33 ` Thomas Bogendoerfer
2008-08-15 17:16 ` C Michael Sundius
2008-08-15 17:16 ` C Michael Sundius
2008-08-15 17:37 ` Dave Hansen
2008-08-15 17:37 ` Dave Hansen
2008-08-15 18:17 ` C Michael Sundius
2008-08-15 18:17 ` C Michael Sundius
2008-08-15 18:23 ` Dave Hansen
2008-08-15 18:23 ` Dave Hansen
2008-08-16 20:07 ` Thomas Bogendoerfer
2008-08-16 20:07 ` Thomas Bogendoerfer
2008-08-18 16:44 ` Randy Dunlap
2008-08-18 16:44 ` Randy Dunlap
2008-08-18 21:24 ` Christoph Lameter
2008-08-18 21:24 ` Christoph Lameter
2008-08-18 21:27 ` Dave Hansen
2008-08-18 21:27 ` Dave Hansen
2008-08-18 21:33 ` Christoph Lameter
2008-08-18 21:33 ` Christoph Lameter
2009-01-16 21:46 ` Michael Sundius
2009-01-16 21:46 ` Michael Sundius
2009-01-21 14:39 ` Christoph Lameter
2009-01-21 14:39 ` Christoph Lameter
2008-08-18 21:57 ` David VomLehn
2008-08-18 21:57 ` David VomLehn
2008-08-19 13:06 ` Christoph Lameter
2008-08-19 13:06 ` Christoph Lameter
2008-08-19 23:38 ` David VomLehn
2008-08-19 23:38 ` David VomLehn
2008-08-19 23:53 ` Jon Fraser
2008-08-19 23:53 ` Jon Fraser
2008-08-20 13:58 ` Christoph Lameter
2008-08-20 13:58 ` Christoph Lameter
2008-08-20 19:28 ` David VomLehn
2008-08-20 19:28 ` David VomLehn
2008-08-20 20:51 ` Christoph Lameter
2008-08-20 20:51 ` Christoph Lameter
2008-08-15 16:30 ` Thomas Bogendoerfer [this message]
2008-08-15 16:30 ` Thomas Bogendoerfer
2008-08-26 9:09 ` Andy Whitcroft
2008-08-26 9:09 ` Andy Whitcroft
2008-10-06 20:15 ` Have ever checked in your mips sparsemem code into mips-linux tree? C Michael Sundius
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