linux-kernel - Re: [PATCH] arm: cmpxchg syscall should data abort if page not write or not young

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Message-ID: <20110314104038.GB26085@n2100.arm.linux.org.uk>
Date:	Mon, 14 Mar 2011 10:40:38 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Po-Yu Chuang <ratbert.chuang@...il.com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	tony@...mide.com, nicolas.pitre@...aro.org, joe@...ches.com,
	Po-Yu Chuang <ratbert@...aday-tech.com>
Subject: Re: [PATCH] arm: cmpxchg syscall should data abort if page not
	write or not young

On Mon, Mar 14, 2011 at 06:28:36PM +0800, Po-Yu Chuang wrote:
> From: Po-Yu Chuang <ratbert@...aday-tech.com>
> 
> If the page to cmpxchg is user mode read only (not write)
> or invalid (not young), we should simulate a data abort first.

No.  If it is not young then it should be made young.  Age is an effect
of accesses.  It's not a permission.
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