1 files changed, 4 insertions, 15 deletions
diff --git a/mm/gup.c b/mm/gup.c
index 598e8c98367b..838db6c0bfc2 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -682,21 +682,10 @@ static struct page *follow_pmd_mask(struct vm_area_struct *vma,
 		return follow_page_pte(vma, address, pmd, flags, &ctx->pgmap);
 	}
 	if (flags & FOLL_SPLIT_PMD) {
-		int ret;
-		page = pmd_page(*pmd);
-		if (is_huge_zero_page(page)) {
-			spin_unlock(ptl);
-			ret = 0;
-			split_huge_pmd(vma, pmd, address);
-			if (pmd_trans_unstable(pmd))
-				ret = -EBUSY;
-		} else {
-			spin_unlock(ptl);
-			split_huge_pmd(vma, pmd, address);
-			ret = pte_alloc(mm, pmd) ? -ENOMEM : 0;
-		}
-
-		return ret ? ERR_PTR(ret) :
+		spin_unlock(ptl);
+		split_huge_pmd(vma, pmd, address);
+		/* If pmd was left empty, stuff a page table in there quickly */
+		return pte_alloc(mm, pmd) ? ERR_PTR(-ENOMEM) :
 			follow_page_pte(vma, address, pmd, flags, &ctx->pgmap);
 	}
 	page = follow_trans_huge_pmd(vma, address, pmd, flags);