Merge branch 'master'

5 files changed, 56 insertions, 5 deletions

diff --git a/mm/filemap.c b/mm/filemap.c
index 1120338a5d0..82c448898d0 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -697,6 +697,38 @@ unsigned find_get_pages(struct address_space *mapping, pgoff_t start,
 	return ret;
 }
 
+/**
+ * find_get_pages_contig - gang contiguous pagecache lookup
+ * @mapping:	The address_space to search
+ * @index:	The starting page index
+ * @nr_pages:	The maximum number of pages
+ * @pages:	Where the resulting pages are placed
+ *
+ * find_get_pages_contig() works exactly like find_get_pages(), except
+ * that the returned number of pages are guaranteed to be contiguous.
+ *
+ * find_get_pages_contig() returns the number of pages which were found.
+ */
+unsigned find_get_pages_contig(struct address_space *mapping, pgoff_t index,
+			       unsigned int nr_pages, struct page **pages)
+{
+	unsigned int i;
+	unsigned int ret;
+
+	read_lock_irq(&mapping->tree_lock);
+	ret = radix_tree_gang_lookup(&mapping->page_tree,
+				(void **)pages, index, nr_pages);
+	for (i = 0; i < ret; i++) {
+		if (pages[i]->mapping == NULL || pages[i]->index != index)
+			break;
+
+		page_cache_get(pages[i]);
+		index++;
+	}
+	read_unlock_irq(&mapping->tree_lock);
+	return i;
+}
+
 /*
  * Like find_get_pages, except we only return pages which are tagged with
  * `tag'.   We update *index to index the next page for the traversal.
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 1fe76d963ac..1ae2b2cc3a5 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -69,12 +69,16 @@ int __add_pages(struct zone *zone, unsigned long phys_start_pfn,
 	for (i = 0; i < nr_pages; i += PAGES_PER_SECTION) {
 		err = __add_section(zone, phys_start_pfn + i);
 
-		if (err)
+		/* We want to keep adding the rest of the
+		 * sections if the first ones already exist
+		 */
+		if (err && (err != -EEXIST))
 			break;
 	}
 
 	return err;
 }
+EXPORT_SYMBOL_GPL(__add_pages);
 
 static void grow_zone_span(struct zone *zone,
 		unsigned long start_pfn, unsigned long end_pfn)
diff --git a/mm/migrate.c b/mm/migrate.c
index d444229f259..1c25040693d 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -439,6 +439,17 @@ redo:
 			goto unlock_both;
                 }
 
+		/* Make sure the dirty bit is up to date */
+		if (try_to_unmap(page, 1) == SWAP_FAIL) {
+			rc = -EPERM;
+			goto unlock_both;
+		}
+
+		if (page_mapcount(page)) {
+			rc = -EAGAIN;
+			goto unlock_both;
+		}
+
 		/*
 		 * Default handling if a filesystem does not provide
 		 * a migration function. We can only migrate clean
diff --git a/mm/slab.c b/mm/slab.c
index af5c5237e11..c32af7e7581 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -979,7 +979,8 @@ static void __drain_alien_cache(struct kmem_cache *cachep,
 		 * That way we could avoid the overhead of putting the objects
 		 * into the free lists and getting them back later.
 		 */
-		transfer_objects(rl3->shared, ac, ac->limit);
+		if (rl3->shared)
+			transfer_objects(rl3->shared, ac, ac->limit);
 
 		free_block(cachep, ac->entry, ac->avail, node);
 		ac->avail = 0;
diff --git a/mm/sparse.c b/mm/sparse.c
index 0a51f36ba3a..d7c32de99ee 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -32,7 +32,10 @@ static struct mem_section *sparse_index_alloc(int nid)
 	unsigned long array_size = SECTIONS_PER_ROOT *
 				   sizeof(struct mem_section);
 
-	section = alloc_bootmem_node(NODE_DATA(nid), array_size);
+	if (system_state == SYSTEM_RUNNING)
+		section = kmalloc_node(array_size, GFP_KERNEL, nid);
+	else
+		section = alloc_bootmem_node(NODE_DATA(nid), array_size);
 
 	if (section)
 		memset(section, 0, array_size);
@@ -281,9 +284,9 @@ int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
 
 	ret = sparse_init_one_section(ms, section_nr, memmap);
 
-	if (ret <= 0)
-		__kfree_section_memmap(memmap, nr_pages);
 out:
 	pgdat_resize_unlock(pgdat, &flags);
+	if (ret <= 0)
+		__kfree_section_memmap(memmap, nr_pages);
 	return ret;
 }