Unhandled fault or spinlock lockup suspected ?

[Fabio Estevam]

On Tue, Sep 29, 2015 at 2:50 PM, Jean-Christian de Rivaz <jc at eclis.ch> wrote:
> Le 29. 09. 15 18:22, Russell King - ARM Linux a écrit :
>>
>> On Tue, Sep 29, 2015 at 06:02:33PM +0200, Jean-Christian de Rivaz wrote:
>>>
>>> I tried the last git linux master on a embedded system that worked with a
>>> 3.19.0 kernel before. I solved most of the problems caused by the kernel
>>> upgrade, but every 15 to 20 minutes I get this type of kernel report:
>>
>> Yes, it's because of the user access changes.  The uaccess_with_memcpy()
>> code got broken, and despite trying to fix it, it seems that it's still
>> broken.  I'll try again to fix it in the next few days.
>>
>> In any case, unless you have a Marvell platform, you should have this
>> disabled - it provides a performance boost for Marvell platforms, but
>> degrades performance everywhere else.  Please ensure that you disable
>> CONFIG_UACCESS_WITH_MEMCPY.
>>
>
> Hi Russell, many thanks for your fast help. Work well when
> CONFIG_UACCESS_WITH_MEMCPY is disabled.

Cool, maybe you could send a patch removing CONFIG_UACCESS_WITH_MEMCPY from
arch/arm/configs/at91_dt_defconfig and sama5_defconfig ?