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);