linux-kernel - Re: [PATCH] Make LIST

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Message-ID: <20080519132250.GA20793@elte.hu>
Date:	Mon, 19 May 2008 15:22:50 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Avi Kivity <avi@...ranet.com>
Cc:	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Make LIST_POISON less deadly


* Avi Kivity <avi@...ranet.com> wrote:

>> i'd suggest to add an ARCH_ILLEGAL_POINTER define instead, which 
>> defaults to zero and gets added to pointer-ish poison values. That 
>> makes it both simpler and also it does not need any include/asm 
>> changes because ARCH_ILLEGAL_POINTER can be set from the Kconfig 
>> space.
>
> Right.
>
> How much unmapped space do we have on i386 or other archs?  The deltas 
> added to ARCH_ILLEGAL_POINTER will have to be limited to that.

can we get away with having the offset default to zero, and all poison 
values remain unchanged if that? Then 64-bit x86 could just set the 
offset to 2^63 and we wont have to worry about 32-bit x86 at all ...

i.e. start small with this and only have an effect on 64-bit x86.

	Ingo
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