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

[Oliver O'Halloran]

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.

> If not we should either add that or add _PAGE_SAO and everything else
> that could possibly ever be there.

ok