linux-kernel - Re: [PATCH] [30/30] x86_64: Add missing !X86

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Message-ID: <4637A5EA.80206@cosmosbay.com>
Date:	Tue, 01 May 2007 22:41:14 +0200
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Bill Irwin <bill.irwin@...cle.com>
CC:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andi Kleen <ak@...e.de>, patches@...-64.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [30/30] x86_64: Add missing !X86_PAE dependincy to the
 2G/2G split.

Eric W. Biederman a écrit :
> Bill Irwin <bill.irwin@...cle.com> writes:
> 
>> Only 1GB-aligned kernel/user splits are now handled for PAE. The
>> 2GB/2GB split attempts to avoid aliasing vmallocspace with the 1:1
>> mapping for physical memory by using an actual split of 1.875/2.125
>> to accommodate 128MB of vmallocspace out of what would otherwise
>> be a full 2GB for userspace. That attempt disturbs the alignment
>> required by PAE for 2GB/2GB splits, and furthermore does not provide
>> a 2GB/2GB split as advertised.
>>
>> This patch resolves the issues here in two manners. The first is
>> by providing a true 2GB/2GB split in addition to the 1.875/2.125
>> split. The second is by renaming the 1.875/2.125 split to
>> CONFIG_VMSPLIT_2G_OPT analogously to CONFIG_VMSPLIT_3G_OPT, which
>> performs a similar manuever to avoid aliasing vmallocspace with
>> the 1:1 mapping for physical memory around the 3GB boundary. With
>> the 1.875/2.125 split properly-named, its config option is then
>> tagged as depending on !HIGHMEM to express the PAE implementation's
>> current inability to deal with such unaligned splits.
>>
>> This patch is essentially a combination of two patches, one written
>> by Eric Biederman and the other by Eric Dumazet. If they could add
>> their Signed-off-by: to this, I'd be much obliged.
>>
>> Signed-off-by: William Irwin <wli@...omorphy.com>
>> Cc: Eric Dumazet <dada1@...mosbay.com>
>> Cc: Mark Lord <lkml@....ca>
>> Cc: Eric W. Biederman <ebiederm@...ssion.com>
>> Cc: Andi Kleen <ak@...e.de>
> 
> Acked-by: "Eric W. Biederman" <ebiederm@...ssion.com>

Acked-by: Eric Dumazet <dada1@...mosbay.com>
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