From: Ian Molton <spyro@f2s.com>
To: Anton Blanchard <anton@samba.org>
Cc: akpm@osdl.org, nickpiggin@yahoo.com.au, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Use MM_VM_SIZE in exit_mmap
Date: Tue, 25 Jan 2005 23:02:10 +0000 [thread overview]
Message-ID: <41F6CFF2.7010907@f2s.com> (raw)
In-Reply-To: <20050125142210.GI5920@krispykreme.ozlabs.ibm.com>
Anton Blanchard wrote:
> As an aside, all architectures except one define FIRST_USER_PGD_NR as 0:
>
> include/asm-arm26/pgtable.h:#define FIRST_USER_PGD_NR 1
All processes on arm26 must map the same page 0 as its where the SWI
vector table goes. The vector table is located at address 0, and as such
becomes virtual address space once the MMU is switched on. This is
unavoidable, unlike later ARMs which can remap it elsewhere.
The only way this could work is if you do the zeroing with all
interrupts off and restore page 0 afterwards, which seems rather silly
to me.
next prev parent reply other threads:[~2005-01-25 23:07 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-01-25 14:22 [PATCH] Use MM_VM_SIZE in exit_mmap Anton Blanchard
2005-01-25 16:46 ` Chris Wedgwood
2005-01-25 16:57 ` Anton Blanchard
2005-01-25 17:13 ` Chris Wedgwood
2005-01-27 20:46 ` [PATCH RFC] Change (some) TASK_SIZE to task_vtop(current) Chris Wedgwood
2005-01-25 23:02 ` Ian Molton [this message]
2005-01-25 23:39 ` [PATCH] Use MM_VM_SIZE in exit_mmap Russell King
2005-01-26 0:01 ` Anton Blanchard
2005-01-26 0:17 ` Nick Piggin
2005-01-26 6:44 ` Andi Kleen
2005-01-26 7:39 ` William Lee Irwin III
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