Benjamin Herrenschmidt [off-list ref] writes:

On Mon, 2016-05-30 at 14:12 +0530, Aneesh Kumar K.V wrote:

quoted

=C2=A0/* Encode and de-code a swap entry */

@@ -516,10 +533,12 @@ static inline pte_t pte_swp_mksoft_dirty(pte_t

pte)
=C2=A0{
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0return __pte(pte_val(pte=

) | _PAGE_SWP_SOFT_DIRTY);

quoted

=C2=A0}

These kind of setters (and mkspecial etc...) could also just OR
the byteswapped constant to the raw PTE..

We seems to be doing the right thing w.r.t setters


static inline pte_t pte_mkdirty(pte_t pte)
{
        return __pte(pte_val(pte) | _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
     9d8:       ff ff 40 39     li      r10,-1
     9dc:       04 00 4a 79     rldicr  r10,r10,0,0
     9e0:       78 53 2a 7d     or      r10,r9,r10
}

-aneesh