ppc32 panic on boot on linux-next

[Michael Ellerman]

Christophe Leroy <christophe.leroy at c-s.fr> writes:
> Le 07/03/2020 à 09:42, Christophe Leroy a écrit :
>> Le 06/03/2020 à 20:05, Nick Desaulniers a écrit :
>>> As a heads up, our CI went red last night, seems like a panic from
>>> free_initmem?  Is this a known issue?
>> 
>> Thanks for the heads up.
>> 
>> No such issue with either 8xx or book3s/32.
>> 
>> I've now been able to reproduce it with bamboo QEMU.
>> 
>> Reverting 2efc7c085f05 makes it disappear. I'll investigate.
>> 
>
> Ok, I found the problem. virt_to_kpte() lacks a NULL pmd check. I'll 
> send a patch for that.
>
> However, if there is no PMD I guess this area is mapped through some 
> kind of block mapping. Therefore it should bail out of the function through:
>
> 	if (v_block_mapped(address))
> 		return 0;
>
>
> Can someone who knows BOOKE investigate that ?

Not sure we have anyone left?

cheers