Re: [PATCH -V2 4/5] powerpc: mm: Only check for _PAGE_PRESENT in set_pte/pmd functions

On Mon, Nov 18, 2013 at 02:58:12PM +0530, Aneesh Kumar K.V wrote:

From: "Aneesh Kumar K.V" <redacted>

We want to make sure we don't use these function when updating a pte
or pmd entry that have a valid hpte entry, because these functions
don't invalidate them. So limit the check to _PAGE_PRESENT bit.
Numafault core changes use these functions for updating _PAGE_NUMA bits.
That should be ok because when _PAGE_NUMA is set we can be sure that
hpte entries are not present.

Signed-off-by: Aneesh Kumar K.V <redacted>

Acked-by: Paul Mackerras <redacted>