[BISECTED] kexec regression on PowerBook G4

[Christophe Leroy]

Le 24/05/2019 à 15:29, Aaro Koskinen a écrit :
> Hi,
> 
> On Fri, May 24, 2019 at 09:40:30AM +0200, Christophe Leroy wrote:
>> Le 24/05/2019 à 09:36, Aaro Koskinen a écrit :
>>> On Fri, May 24, 2019 at 08:08:36AM +0200, Christophe Leroy wrote:
>>>>> Le 24/05/2019 à 00:23, Aaro Koskinen a écrit :
>>>>>> Unfortunately still no luck... The crash is pretty much the same with
>>>>>> both
>>>>>> changes.
>>>>>
>>>>> Right. In fact change_page_attr() does nothing because this part of RAM is
>>>>> mapped by DBATs so v_block_mapped() returns not NULL.
>>>>>
>>>>> So, we have to set an IBAT for this area. I'll try and send you a new
>>>>> patch for that before noon (CET).
>>>>>
>>>>
>>>> patch sent out. In the patch I have also added a printk to print the buffer
>>>> address, so if the problem still occurs, we'll know if the problem is really
>>>> at the address of the buffer or if we are wrong from the beginning.
>>>
>>> Reboot code buffer at ef0c3000
>>> Bye!
>>> BUG: Unable to handle kernel instruction fetch
>>> Faulting instruction address: 0xef0c3000
>>>
>>
>> Oops, I forgot to call update_bats() after setibat().
>>
>> Can you add it and retry ?
> 
> Thanks, that was it, now it finally works!
> 

Thanks for reporting the issue and testing.

I'll work on a clean fix patch in the begining of June.

Christophe