Alexander Graf <[email protected]> writes:
> On 06.05.14 02:41, Paul Mackerras wrote:
>> On Mon, May 05, 2014 at 01:19:30PM +0200, Alexander Graf wrote:
>>> On 05/04/2014 07:21 PM, Aneesh Kumar K.V wrote:
>>>> +#ifdef CONFIG_PPC_BOOK3S_64
>>>> + return vcpu->arch.fault_dar;
>>> How about PA6T and G5s?
>> G5 sets DAR on an alignment interrupt.
>>
>> As for PA6T, I don't know for sure, but if it doesn't, ordinary
>> alignment interrupts wouldn't be handled properly, since the code in
>> arch/powerpc/kernel/align.c assumes DAR contains the address being
>> accessed on all PowerPC CPUs.
>
> Now that's a good point. If we simply behave like Linux, I'm fine. This
> definitely deserves a comment on the #ifdef in the code.
How about ?
#ifdef CONFIG_PPC_BOOK3S_64
/*
* Linux always expect a valid dar as per alignment
* interrupt handling code (fix_alignment()). Don't compute the dar
* value here, instead used the saved dar value. Right now we restrict
* this only for BOOK3S-64.
*/
return vcpu->arch.fault_dar;
#else
-aneesh
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