From: "Aneesh Kumar K.V" <aneesh.ku...@linux.vnet.ibm.com>
We need to handle numa pte via the slow path
Signed-off-by: Aneesh Kumar K.V <aneesh.ku...@linux.vnet.ibm.com>
---
arch/powerpc/mm/gup.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/arch/powerpc/mm/gup.c b/arch/powerpc/mm/gup.c
index c5f734e20b0f..d8746684f606 100644
--- a/arch/powerpc/mm/gup.c
+++ b/arch/powerpc/mm/gup.c
@@ -36,6 +36,11 @@ static noinline int gup_pte_range(pmd_t pmd, unsigned long
addr,
do {
pte_t pte = ACCESS_ONCE(*ptep);
struct page *page;
+ /*
+ * Similar to the PMD case, NUMA hinting must take slow path
+ */
+ if (pte_numa(pte))
+ return 0;
if ((pte_val(pte) & mask) != result)
return 0;
@@ -75,6 +80,14 @@ static int gup_pmd_range(pud_t pud, unsigned long addr,
unsigned long end,
if (pmd_none(pmd) || pmd_trans_splitting(pmd))
return 0;
if (pmd_huge(pmd) || pmd_large(pmd)) {
+ /*
+ * NUMA hinting faults need to be handled in the GUP
+ * slowpath for accounting purposes and so that they
+ * can be serialised against THP migration.
+ */
+ if (pmd_numa(pmd))
+ return 0;
+
if (!gup_hugepte((pte_t *)pmdp, PMD_SIZE, addr, next,
write, pages, nr))
return 0;
--
1.8.3.2
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