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-rw-r--r--mm/hugetlb.c16
1 files changed, 13 insertions, 3 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 2d2ff5e8bf2b..681b300185c0 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -3256,9 +3256,14 @@ int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
set_huge_swap_pte_at(dst, addr, dst_pte, entry, sz);
} else {
if (cow) {
+ /*
+ * No need to notify as we are downgrading page
+ * table protection not changing it to point
+ * to a new page.
+ *
+ * See Documentation/vm/mmu_notifier.txt
+ */
huge_ptep_set_wrprotect(src, addr, src_pte);
- mmu_notifier_invalidate_range(src, mmun_start,
- mmun_end);
}
entry = huge_ptep_get(src_pte);
ptepage = pte_page(entry);
@@ -4318,7 +4323,12 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
* and that page table be reused and filled with junk.
*/
flush_hugetlb_tlb_range(vma, start, end);
- mmu_notifier_invalidate_range(mm, start, end);
+ /*
+ * No need to call mmu_notifier_invalidate_range() we are downgrading
+ * page table protection not changing it to point to a new page.
+ *
+ * See Documentation/vm/mmu_notifier.txt
+ */
i_mmap_unlock_write(vma->vm_file->f_mapping);
mmu_notifier_invalidate_range_end(mm, start, end);