[PATCH 1/2] powerpc/mm: fix up pgtable dump flags

[Michael Ellerman]

Oliver O'Halloran <oohall at gmail.com> writes:

> On Wed, Apr 12, 2017 at 4:52 PM, Michael Ellerman <mpe at ellerman.id.au> wrote:
>> Rashmica Gupta <rashmica.g at gmail.com> writes:
>>
>>> On 31/03/17 12:37, Oliver O'Halloran wrote:
>>>> On Book3s we have two PTE flags used to mark cache-inhibited mappings:
>>>> _PAGE_TOLERANT and _PAGE_NON_IDEMPOTENT. Currently the kernel page
>>>> table dumper only looks at the generic _PAGE_NO_CACHE which is
>>>> defined to be _PAGE_TOLERANT. This patch modifies the dumper so
>>>> both flags are shown in the dump.
>>>>
>>>> Cc: Rashmica Gupta <rashmica.g at gmail.com>
>>>> Signed-off-by: Oliver O'Halloran <oohall at gmail.com>
>>
>>> Should we also add in _PAGE_SAO  that is in Book3s?
>>
>> I don't think we ever expect to see it in the kernel page tables. But if
>> we did that would be "interesting".
>>
>> I've forgotten what the code does with unknown bits, does it already
>> print them in some way?
>
> Currently it just traverses the list of known bits and prints out a
> message for each. Printing any unknown bits is probably a good idea.
> I'll send another patch to add that though and leave this one as-is.

Thanks.

cheers