From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: Jan Beulich <jbeulich@novell.com>,
Stable Kernel <stable@kernel.org>,
x86@kernel.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH UPDATED] x86: set PAE PHYSICAL_MASK_SHIFT to 44 bits.
Date: Tue, 10 Jun 2008 14:06:37 +0100 [thread overview]
Message-ID: <484E7C5D.50701@goop.org> (raw)
In-Reply-To: <20080610103151.GG19136@elte.hu>
Ingo Molnar wrote:
>> When a 64-bit x86 processor runs in 32-bit PAE mode, a pte can
>> potentially have the same number of physical address bits as the
>> 64-bit host ("Enhanced Legacy PAE Paging"). This means, in theory, we
>> could have up to 52 bits of physical address in a pte.
>>
>> The 32-bit kernel uses a 32-bit unsigned long to represent a pfn. This
>> means that it can only represent physical addresses up to 32+12=44
>> bits wide. Rather than widening pfns everywhere, just set 2^44 as the
>> Linux x86_32-PAE architectural limit for physical address size.
>>
>
> applied to tip/x86/cleanups - thanks Jeremy. No urgency for v2.6.26,
> right?
Not urgent, but it would be nice to have.
J
next prev parent reply other threads:[~2008-06-10 13:07 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-05 15:21 [PATCH] x86: set PAE PHYSICAL_MASK_SHIFT to match 64-bit Jeremy Fitzhardinge
2008-06-05 15:34 ` Jan Beulich
2008-06-05 15:42 ` Jeremy Fitzhardinge
2008-06-05 16:45 ` H. Peter Anvin
2008-06-05 21:14 ` Jeremy Fitzhardinge
2008-06-07 18:35 ` H. Peter Anvin
2008-06-06 9:21 ` [PATCH UPDATED] x86: set PAE PHYSICAL_MASK_SHIFT to 44 bits Jeremy Fitzhardinge
2008-06-06 9:58 ` Jan Beulich
2008-06-06 13:15 ` Andi Kleen
2008-06-06 13:50 ` Jeremy Fitzhardinge
2008-06-10 10:31 ` Ingo Molnar
2008-06-10 13:06 ` Jeremy Fitzhardinge [this message]
2008-06-13 7:24 ` Ingo Molnar
2008-06-06 1:40 ` [PATCH] x86: set PAE PHYSICAL_MASK_SHIFT to match 64-bit Andi Kleen
2008-06-06 7:14 ` Jan Beulich
2008-06-06 7:59 ` Jeremy Fitzhardinge
2008-06-06 8:14 ` Jan Beulich
2008-06-06 8:15 ` Jeremy Fitzhardinge
2008-06-07 18:39 ` H. Peter Anvin
2008-06-06 4:45 ` Arjan van de Ven
2008-06-06 8:08 ` Jeremy Fitzhardinge
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