From mboxrd@z Thu Jan  1 00:00:00 1970
From: linux@arm.linux.org.uk (Russell King - ARM Linux)
Date: Tue, 11 Jan 2011 09:06:15 +0000
Subject: [PATCH] arm: mm: Poison freed init memory
In-Reply-To: <4D2BE3E1.5060706@codeaurora.org>
References: <1294256845-29517-1-git-send-email-sboyd@codeaurora.org>
	<20110105202645.GL8638@n2100.arm.linux.org.uk>
	<4D255263.7040106@codeaurora.org>
	<20110106090741.GQ8638@n2100.arm.linux.org.uk>
	<4D2BE3E1.5060706@codeaurora.org>
Message-ID: <20110111090615.GH12552@n2100.arm.linux.org.uk>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Mon, Jan 10, 2011 at 09:00:17PM -0800, Stephen Boyd wrote:
> Ok it seems that 0xcc was chosen by Pavel since it's a breakpoint
> instruction (sorry for not noticing that earlier [1]).

It may be on x86, but on ARM:

   0:   cccccccc        stclgt  12, cr12, [ip], {204}

That's a co-processor #12 instruction which will only be executed of
the processor condition codes satisfy 'gt'.

> There was some discussion about handling initdata with Pavel's patch
> but it seems that nothing came of it?

I'm not sure who this Pavel is who you keep referring to - the message
you link to is a discussion between William Irvin and hpa.

> How about we use 0xe7fddef0? This seems to satisfy at least your first
> point for both ARM and Thumb mode (Thumb will branch to the 0xdef0
> instruction).

Yup.