ppc32 panic on boot on linux-next

[Christophe Leroy]

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 ?

Christophe