---

yaml --- r: 362595 b: refs/heads/master c: 9cc3a5b h: refs/heads/master i: 362593: 451ee88 362591: 9272f78 v: v3
git-mirror · Apr 17, 2013 · dd0bd6a · dd0bd6a
1 parent 87eca9c
commit dd0bd6a
Show file tree

Hide file tree

Showing 2 changed files with 12 additions and 2 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 23d9e482136e31c9d287633a6e473daa172767c4
+refs/heads/master: 9cc3a5bd40067b9a0fbd49199d0780463fc2140f
diff --git a/trunk/mm/hugetlb.c b/trunk/mm/hugetlb.c
@@ -2961,7 +2961,17 @@ long follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
 			break;
 		}
 
-		if (absent ||
+		/*
+		 * We need call hugetlb_fault for both hugepages under migration
+		 * (in which case hugetlb_fault waits for the migration,) and
+		 * hwpoisoned hugepages (in which case we need to prevent the
+		 * caller from accessing to them.) In order to do this, we use
+		 * here is_swap_pte instead of is_hugetlb_entry_migration and
+		 * is_hugetlb_entry_hwpoisoned. This is because it simply covers
+		 * both cases, and because we can't follow correct pages
+		 * directly from any kind of swap entries.
+		 */
+		if (absent || is_swap_pte(huge_ptep_get(pte)) ||
 		    ((flags & FOLL_WRITE) && !pte_write(huge_ptep_get(pte)))) {
 			int ret;