On 6/6/16, Michael Ellerman <m...@ellerman.id.au> wrote:
> On Mon, 2016-06-06 at 10:52 +0300, Denis Kirjanov wrote:
>
>> Update: now with the proper mailing address.
>>
>> Hi,
>>
>> Posting if anyone knows how to quickly fix it :)
>
> Sorry but no.
>
>> Enabling CONFIG_PPC_EARLY_DEBUG on my quad G5 causes kernel to die
>> with the unrecoverable exception 4100.
>
> That means you took a SLB miss when MSR_RI was off.
>
> What's at c000000000ace328 ?
>
>> I haven't bisected this yet. Photo attached.
>
> A bisect would be awesome.
Ok, the issue was introduced by the commit
caca285e5ab4a7a19fede51688106ceed6fc45dd (powerpc/mm/radix: Use
STD_MMU_64 to properly isolate hash related code) and 970mp dies on
the following condition:
+BEGIN_MMU_FTR_SECTION
bl slb_allocate_realmode
-
+END_MMU_FTR_SECTION_IFCLR(MMU_FTR_RADIX)
In my config I've enabled radix MMU lookup but in my understanding
only recent IBM machines support this feature and we have to call SLB
entry through slb_allocate_realmode on HPTE machine?
Thanks!
>
> cheers
>
>
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