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powerpc/mm: Add devmap support for ppc64

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Add support for the devmap bit on PTEs and PMDs for PPC64 Book3S.  This
is used to differentiate device backed memory from transparent huge
pages since they are handled in more or less the same manner by the core
mm code.

Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Oliver O'Halloran
2017-06-28 11:32:34 +10:00
committed by Michael Ellerman
parent b584c25440
commit ebd3119793
7 changed files with 55 additions and 7 deletions
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arch/powerpc/mm/hugetlbpage.c
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@@ -964,7 +964,7 @@ pte_t *__find_linux_pte_or_hugepte(pgd_t *pgdir, unsigned long ea,
if (pmd_none(pmd))
return NULL;
if (pmd_trans_huge(pmd)) {
if (pmd_trans_huge(pmd) || pmd_devmap(pmd)) {
if (is_thp)
*is_thp = true;
ret_pte = (pte_t *) pmdp;