Re: [PATCH/RFC] powerpc: Better handle "error" type page faults on book3s64

On Fri, 2017-07-14 at 18:31 +1000, Benjamin Herrenschmidt wrote:

There are a number of conditions in the DSISR that represent
conditions for which there is no point looking for a VMA or
trying to update a PTE. In fact, POWER9 adds a few with bad
AMOs, bad "paste" instruction etc...

This improve our existing code to use symbolic constants for
all DSISR bits, properly avoid hash_page() for the new bits,
and handle both the old and new bits early in do_page_fault()

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
--

Looks reasonable

Acked-by: Balbir Singh <bsingharora@gmail.com>