diff options
| -rw-r--r-- | mm/hugetlb.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 3fc5a214f0b9..52475c4262e4 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -6604,8 +6604,17 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma, spinlock_t *ptl; ptep = huge_pte_offset(mm, address, psize); if (!ptep) { - address |= last_addr_mask; - continue; + if (!uffd_wp) { + address |= last_addr_mask; + continue; + } + /* + * Userfaultfd wr-protect requires pgtable + * pre-allocations to install pte markers. + */ + ptep = huge_pte_alloc(mm, vma, address, psize); + if (!ptep) + break; } ptl = huge_pte_lock(h, mm, ptep); if (huge_pmd_unshare(mm, vma, address, ptep)) { |