Date: Wed, 26 Jan 2005 11:01:36 +1100
From: Anton Blanchard <anton@samba.org>
To: Ian Molton <spyro@f2s.com>, akpm@osdl.org, nickpiggin@yahoo.com.au,
       linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Use MM_VM_SIZE in exit_mmap
Message-ID: <20050126000136.GB27433@krispykreme.ozlabs.ibm.com>
References: <20050125142210.GI5920@krispykreme.ozlabs.ibm.com> <41F6CFF2.7010907@f2s.com> <20050125233949.C30094@flint.arm.linux.org.uk>
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Hi,

> I don't think Anton can count.  (and for some reason I seem to be missing
> his mail at the moment.)
> 
> include/asm-arm/pgtable.h:#define FIRST_USER_PGD_NR     1
> 
> there's two.  FIRST_USER_PGD_NR was created specifically for ARM because
> many of our CPUs place their hardware vector tables at *virtual* address
> zero.  Unmapping this virtual page would be rather bad for the system -
> consider the effect of unmapping the code for *all* CPU exceptions.

It does look like I have trouble counting past 1 :) Lets forget that
proposal, it was just a minor cleanup anyway.

Anton
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