Re: [PATCH] [RFC] fix kernel crash (protection id trap) when

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On Fri, Dec 19, 2008 at 11:13 AM, John David Anglin
<dave@xxxxxxxxxxxxxxxxxx> wrote:
>> > For future reference, in mmu_context.h. Bloody tricky mtctl() macro
>> > doesn't take a prefix, just the numeric cr #.
>>
>> Evil.
>
> If this is a problem with the WD bit, the problem is likely here:
>
>        mtctl(context >> (SPACEID_SHIFT - 1),8);
>
> It's possible this might set the WD bit depending on the alignment
> of context and the value of SPACEID_SHIFT on your machine.  If you
> can duplicate, maybe add a BUG_ON.  On hppa64, all structs are passed
> by value, so the alignment of context  may only be BIGGEST_ALIGNMENT.

The value of context is a space id (the value returned by alloc_sid())
and is not related to any alignment?

Cheers,
Carlos.
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