[PATCH v2] arm: cmpxchg syscall should data abort if page not write

[Po-Yu Chuang]

Dear Nicolas Pitre,

On Tue, Mar 22, 2011 at 4:41 AM, Nicolas Pitre <nicolas.pitre at linaro.org> wrote:
> On Fri, 18 Mar 2011, Po-Yu Chuang wrote:
>> On Fri, Mar 18, 2011 at 1:57 AM, Nicolas Pitre <nicolas.pitre at linaro.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