Mac Mini G4 hang on boot with git master

[christophe leroy]

Le 17/03/2019 à 15:15, Mark Cave-Ayland a écrit :
> On 15/03/2019 13:37, Mark Cave-Ayland wrote:
> 
>> Hi all,
>>
>> I've just done a git pull and rebuilt master on my Mac Mini G4 in order to test
>> Michael's merge of my KVM PR fix, and unfortunately my kernel now hangs on boot :(
>>
>> My last working git checkout was somewhere around the 5.0-rc stage, so I suspect it's
>> something that's been merged for 5.1.
>>
>> The hang occurs just after the boot console is disabled which makes me wonder if
>> something is going wrong during PCI bus enumeration. Does anyone have an idea as to
>> what may be causing this? I can obviously bisect it down, but on slow hardware it can
>> take some time...
> 
> This was a weird one: bisecting directly from git master gave a nonsense result,
> however by manually rebasing Michael's PR onto my last known good commit from master
> I was able to finally pin it down to this commit:
> 
> 
> 7a0d6955f3f7a4250da63d528bfff7a9c91b5725 is the first bad commit
> commit 7a0d6955f3f7a4250da63d528bfff7a9c91b5725
> Author: Christophe Leroy <christophe.leroy at c-s.fr>
> Date:   Thu Feb 21 10:37:55 2019 +0000
> 
>      powerpc/6xx: Store PGDIR physical address in a SPRG
> 
>      Use SPRN_SPRG2 to store the current thread PGDIR and
>      avoid reading thread_struct.pgdir at every TLB miss.
> 
>      Signed-off-by: Christophe Leroy <christophe.leroy at c-s.fr>
>      Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
> 
> 

Hi,

The fix is there:

https://patchwork.ozlabs.org/patch/1053385/

Christophe

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