Merge branch 'master'

3 files changed, 17 insertions, 5 deletions

diff --git a/mm/memory.c b/mm/memory.c
index 9abc6008544b..85e80a57db29 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -623,11 +623,12 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb,
 			(*zap_work)--;
 			continue;
 		}
+
+		(*zap_work) -= PAGE_SIZE;
+
 		if (pte_present(ptent)) {
 			struct page *page;
 
-			(*zap_work) -= PAGE_SIZE;
-
 			page = vm_normal_page(vma, addr, ptent);
 			if (unlikely(details) && page) {
 				/*
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 2a8206009422..b21869a39f0b 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -330,9 +330,19 @@ check_range(struct mm_struct *mm, unsigned long start, unsigned long end,
 	int err;
 	struct vm_area_struct *first, *vma, *prev;
 
-	/* Clear the LRU lists so pages can be isolated */
-	if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL))
+	if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) {
+		/* Must have swap device for migration */
+		if (nr_swap_pages <= 0)
+			return ERR_PTR(-ENODEV);
+
+		/*
+		 * Clear the LRU lists so pages can be isolated.
+		 * Note that pages may be moved off the LRU after we have
+		 * drained them. Those pages will fail to migrate like other
+		 * pages that may be busy.
+		 */
 		lru_add_drain_all();
+	}
 
 	first = find_vma(mm, start);
 	if (!first)
diff --git a/mm/swap.c b/mm/swap.c
index e9ec06d845e8..b524ea90bddb 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -393,7 +393,8 @@ void pagevec_strip(struct pagevec *pvec)
 		struct page *page = pvec->pages[i];
 
 		if (PagePrivate(page) && !TestSetPageLocked(page)) {
-			try_to_release_page(page, 0);
+			if (PagePrivate(page))
+				try_to_release_page(page, 0);
 			unlock_page(page);
 		}
 	}