From: William Lee Irwin III <wli@holomorphy.com>
To: Dave Hansen <haveblue@us.ibm.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: Tue, 7 Jan 2003 15:37:13 -0800 [thread overview]
Message-ID: <20030107233713.GB23814@holomorphy.com> (raw)
In-Reply-To: <3E1B334E.8030807@us.ibm.com>
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.
I see the following:
$ grep -n TASK_SIZE include/asm-i386/*.h
include/asm-i386/a.out.h:22:#define STACK_TOP TASK_SIZE
include/asm-i386/elf.h:60:#define ELF_ET_DYN_BASE (TASK_SIZE / 3 * 2)
include/asm-i386/pgtable.h:68:#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
include/asm-i386/processor.h:277:#define TASK_SIZE (PAGE_OFFSET)
include/asm-i386/processor.h:282:#define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3))
... which sounds like you need to round up in an overflow-safe fashion
in the macro.
Bill
WARNING: multiple messages have this Message-ID (diff)
From: William Lee Irwin III <wli@holomorphy.com>
To: Dave Hansen <haveblue@us.ibm.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: Tue, 7 Jan 2003 15:37:13 -0800 [thread overview]
Message-ID: <20030107233713.GB23814@holomorphy.com> (raw)
In-Reply-To: <3E1B334E.8030807@us.ibm.com>
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.
I see the following:
$ grep -n TASK_SIZE include/asm-i386/*.h
include/asm-i386/a.out.h:22:#define STACK_TOP TASK_SIZE
include/asm-i386/elf.h:60:#define ELF_ET_DYN_BASE (TASK_SIZE / 3 * 2)
include/asm-i386/pgtable.h:68:#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
include/asm-i386/processor.h:277:#define TASK_SIZE (PAGE_OFFSET)
include/asm-i386/processor.h:282:#define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3))
... which sounds like you need to round up in an overflow-safe fashion
in the macro.
Bill
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next prev parent reply other threads:[~2003-01-07 23:28 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 [this message]
2003-01-07 23:37 ` William Lee Irwin III
2003-01-08 21:04 ` Dave Hansen
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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