From: Dave Hansen <haveblue@us.ibm.com>
To: William Lee Irwin III <wli@holomorphy.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-mm@kvack.org
Subject: Re: [RFC][PATCH] allow bigger PAGE_OFFSET with PAE
Date: Wed, 08 Jan 2003 13:04:23 -0800 [thread overview]
Message-ID: <3E1C9257.2040907@us.ibm.com> (raw)
In-Reply-To: 20030107233713.GB23814@holomorphy.com
William Lee Irwin III wrote:
> On Tue, Jan 07, 2003 at 12:06:38PM -0800, Dave Hansen wrote:
>
>>Also, this gets the kernel's pagetables right, but neglects
>>userspace's for now. pgd_alloc() needs to be fixed to allocate
>>another PMD, if the split isn't PMD-alighed.
>
> Um, that should be automatic when USER_PTRS_PER_PGD is increased.
Nope, you need a little bit more. pgd_alloc() relies on its memcpy()
to provide the kernel mappings. After the last user PMD is allocated,
you still need to copy the kernel-shared part of it in.
--
Dave Hansen
haveblue@us.ibm.com
WARNING: multiple messages have this Message-ID (diff)
From: Dave Hansen <haveblue@us.ibm.com>
To: William Lee Irwin III <wli@holomorphy.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-mm@kvack.org
Subject: Re: [RFC][PATCH] allow bigger PAGE_OFFSET with PAE
Date: Wed, 08 Jan 2003 13:04:23 -0800 [thread overview]
Message-ID: <3E1C9257.2040907@us.ibm.com> (raw)
In-Reply-To: 20030107233713.GB23814@holomorphy.com
William Lee Irwin III wrote:
> On Tue, Jan 07, 2003 at 12:06:38PM -0800, Dave Hansen wrote:
>
>>Also, this gets the kernel's pagetables right, but neglects
>>userspace's for now. pgd_alloc() needs to be fixed to allocate
>>another PMD, if the split isn't PMD-alighed.
>
> Um, that should be automatic when USER_PTRS_PER_PGD is increased.
Nope, you need a little bit more. pgd_alloc() relies on its memcpy()
to provide the kernel mappings. After the last user PMD is allocated,
you still need to copy the kernel-shared part of it in.
--
Dave Hansen
haveblue@us.ibm.com
--
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next prev parent reply other threads:[~2003-01-08 20:56 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-01-07 20:06 [RFC][PATCH] allow bigger PAGE_OFFSET with PAE Dave Hansen
2003-01-07 23:37 ` William Lee Irwin III
2003-01-07 23:37 ` William Lee Irwin III
2003-01-08 21:04 ` Dave Hansen [this message]
2003-01-08 21:04 ` Dave Hansen
2003-01-08 22:05 ` William Lee Irwin III
2003-01-08 22:05 ` William Lee Irwin III
2003-01-08 22:44 ` William Lee Irwin III
2003-01-08 22:44 ` William Lee Irwin III
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