linux-kernel - Re: [PATCH v2] arm: cmpxchg syscall should data abort if page not write

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Message-ID: <AANLkTimESa1haKLtS6YmJwK3r=R0=gV4C_eOxSCs0dfa@mail.gmail.com>
Date:	Tue, 22 Mar 2011 10:40:23 +0800
From:	Po-Yu Chuang <ratbert.chuang@...il.com>
To:	Nicolas Pitre <nicolas.pitre@...aro.org>
Cc:	Ashwin Chaugule <ashbertslists@...il.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Po-Yu Chuang <ratbert@...aday-tech.com>, tony@...mide.com,
	lkml <linux-kernel@...r.kernel.org>, joe@...ches.com,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2] arm: cmpxchg syscall should data abort if page not write

Dear Nicolas Pitre,

On Tue, Mar 22, 2011 at 4:41 AM, Nicolas Pitre <nicolas.pitre@...aro.org> wrote:
> On Fri, 18 Mar 2011, Po-Yu Chuang wrote:
>> On Fri, Mar 18, 2011 at 1:57 AM, Nicolas Pitre <nicolas.pitre@...aro.org> wrote:
>> > Nope.  The code being fixed here was suptly broken so it needs fixing.
>> > However this code is almost never used, if at all, as it is a fall-back
>> > solution for when all the better alternatives are not available for some
>> > reasons (and I'm still wondering what those reasons are for Po-Yu Chuang
>> > to actually use that code).  In practice this bug should have affected
>> > no one.
>>
>> We met this problem while porting an v5 SMP processor because kernel
>> selects NEEDS_SYSCALL_FOR_CMPXCHG by default if CPU_32v5.
>>
>> After we added our own implementation of __kuser_cmpxchg, this code
>> is not needed anymore. But since this is actually a bug, it is still a good
>> idea to submit a patch. :-)
>
> Yes.  Please send to RMK's patch system with my ACK.

I thought that Russell King would apply this patch after you ACKed it.
Doesn't it work like this here? How should I do next?

Best regards,
Po-Yu Chuang
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