[PATCH 25/40] autonuma: follow_page check for pte_numa/pmd_numa

[Andrea Arcangeli]

Without this, follow_page wouldn't trigger the NUMA hinting faults.

Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
---
 mm/memory.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index 2e9cab2..78b6acc 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1491,7 +1491,7 @@ struct page *follow_page(struct vm_area_struct *vma, unsigned long address,
 		goto no_page_table;
 
 	pmd = pmd_offset(pud, address);
-	if (pmd_none(*pmd))
+	if (pmd_none(*pmd) || pmd_numa(*pmd))
 		goto no_page_table;
 	if (pmd_huge(*pmd) && vma->vm_flags & VM_HUGETLB) {
 		BUG_ON(flags & FOLL_GET);
@@ -1525,7 +1525,7 @@ split_fallthrough:
 	ptep = pte_offset_map_lock(mm, pmd, address, &ptl);
 
 	pte = *ptep;
-	if (!pte_present(pte))
+	if (!pte_present(pte) || pte_numa(pte))
 		goto no_page;
 	if ((flags & FOLL_WRITE) && !pte_write(pte))
 		goto unlock;
--
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