4 files changed, 24 insertions, 5 deletions

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;
 }