diff --git a/mm/hugetlb.c b/mm/hugetlb.c index c0719ece2b7f..8268943e05eb 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -4341,16 +4341,11 @@ int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src, break; } - /* - * If the pagetables are shared don't copy or take references. - * - * dst_pte == src_pte is the common case of src/dest sharing. - * However, src could have 'unshared' and dst shares with - * another vma. So page_count of ptep page is checked instead - * to reliably determine whether pte is shared. - */ - if (page_count(virt_to_page(dst_pte)) > 1) +#ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE + /* If the pagetables are shared, there is nothing to do */ + if (atomic_read(&virt_to_page(dst_pte)->pt_share_count)) continue; +#endif dst_ptl = huge_pte_lock(h, dst, dst_pte); src_ptl = huge_pte_lockptr(h, src, src_pte);