Merge branch 'master' into for-linus

5 files changed, 40 insertions, 14 deletions

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index d0351e31f474..cafdcee154e8 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2370,7 +2370,7 @@ void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed)
         long chg = region_truncate(&inode->i_mapping->private_list, offset);
 
         spin_lock(&inode->i_lock);
-        inode->i_blocks -= blocks_per_huge_page(h);
+        inode->i_blocks -= (blocks_per_huge_page(h) * freed);
         spin_unlock(&inode->i_lock);
 
         hugetlb_put_quota(inode->i_mapping, (chg - freed));
diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index 5aabd41ffb8f..487267310a84 100644
--- a/mm/kmemleak.c
+++ b/mm/kmemleak.c
@@ -1217,7 +1217,6 @@ static void *kmemleak_seq_start(struct seq_file *seq, loff_t *pos)
         }
         object = NULL;
 out:
-        rcu_read_unlock();
         return object;
 }
 
@@ -1233,13 +1232,11 @@ static void *kmemleak_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 
         ++(*pos);
 
-        rcu_read_lock();
         list_for_each_continue_rcu(n, &object_list) {
                 next_obj = list_entry(n, struct kmemleak_object, object_list);
                 if (get_object(next_obj))
                         break;
         }
-        rcu_read_unlock();
 
         put_object(prev_obj);
         return next_obj;
@@ -1255,6 +1252,7 @@ static void kmemleak_seq_stop(struct seq_file *seq, void *v)
                  * kmemleak_seq_start may return ERR_PTR if the scan_mutex
                  * waiting was interrupted, so only release it if !IS_ERR.
                  */
+                rcu_read_unlock();
                 mutex_unlock(&scan_mutex);
                 if (v)
                         put_object(v);
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index e717964cb5a0..fd4529d86de5 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1207,6 +1207,12 @@ static int mem_cgroup_move_account(struct page_cgroup *pc,
         ret = 0;
 out:
         unlock_page_cgroup(pc);
+        /*
+         * We charges against "to" which may not have any tasks. Then, "to"
+         * can be under rmdir(). But in current implementation, caller of
+         * this function is just force_empty() and it's garanteed that
+         * "to" is never removed. So, we don't check rmdir status here.
+         */
         return ret;
 }
 
@@ -1428,6 +1434,7 @@ __mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr,
                 return;
         if (!ptr)
                 return;
+        cgroup_exclude_rmdir(&ptr->css);
         pc = lookup_page_cgroup(page);
         mem_cgroup_lru_del_before_commit_swapcache(page);
         __mem_cgroup_commit_charge(ptr, pc, ctype);
@@ -1457,8 +1464,12 @@ __mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr,
                 }
                 rcu_read_unlock();
         }
-        /* add this page(page_cgroup) to the LRU we want. */
-
+        /*
+         * At swapin, we may charge account against cgroup which has no tasks.
+         * So, rmdir()->pre_destroy() can be called while we do this charge.
+         * In that case, we need to call pre_destroy() again. check it here.
+         */
+        cgroup_release_and_wakeup_rmdir(&ptr->css);
 }
 
 void mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr)
@@ -1664,7 +1675,7 @@ void mem_cgroup_end_migration(struct mem_cgroup *mem,
 
         if (!mem)
                 return;
-
+        cgroup_exclude_rmdir(&mem->css);
         /* at migration success, oldpage->mapping is NULL. */
         if (oldpage->mapping) {
                 target = oldpage;
@@ -1704,6 +1715,12 @@ void mem_cgroup_end_migration(struct mem_cgroup *mem,
          */
         if (ctype == MEM_CGROUP_CHARGE_TYPE_MAPPED)
                 mem_cgroup_uncharge_page(target);
+        /*
+         * At migration, we may charge account against cgroup which has no tasks
+         * So, rmdir()->pre_destroy() can be called while we do this charge.
+         * In that case, we need to call pre_destroy() again. check it here.
+         */
+        cgroup_release_and_wakeup_rmdir(&mem->css);
 }
 
 /*
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index caa92689aac9..d052abbe3063 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -882,7 +882,7 @@ retry_reserve:
  */
 static int rmqueue_bulk(struct zone *zone, unsigned int order, 
                         unsigned long count, struct list_head *list,
-                        int migratetype)
+                        int migratetype, int cold)
 {
         int i;
         
@@ -901,7 +901,10 @@ static int rmqueue_bulk(struct zone *zone, unsigned int order,
                  * merge IO requests if the physical pages are ordered
                  * properly.
                  */
-                list_add(&page->lru, list);
+                if (likely(cold == 0))
+                        list_add(&page->lru, list);
+                else
+                        list_add_tail(&page->lru, list);
                 set_page_private(page, migratetype);
                 list = &page->lru;
         }
@@ -1119,7 +1122,8 @@ again:
                 local_irq_save(flags);
                 if (!pcp->count) {
                         pcp->count = rmqueue_bulk(zone, 0,
-                                        pcp->batch, &pcp->list, migratetype);
+                                        pcp->batch, &pcp->list,
+                                        migratetype, cold);
                         if (unlikely(!pcp->count))
                                 goto failed;
                 }
@@ -1138,7 +1142,8 @@ again:
                 /* Allocate more to the pcp list if necessary */
                 if (unlikely(&page->lru == &pcp->list)) {
                         pcp->count += rmqueue_bulk(zone, 0,
-                                        pcp->batch, &pcp->list, migratetype);
+                                        pcp->batch, &pcp->list,
+                                        migratetype, cold);
                         page = list_entry(pcp->list.next, struct page, lru);
                 }
 
@@ -1740,8 +1745,10 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
          * be using allocators in order of preference for an area that is
          * too large.
          */
-        if (WARN_ON_ONCE(order >= MAX_ORDER))
+        if (order >= MAX_ORDER) {
+                WARN_ON_ONCE(!(gfp_mask & __GFP_NOWARN));
                 return NULL;
+        }
 
         /*
          * GFP_THISNODE (meaning __GFP_THISNODE, __GFP_NORETRY and
@@ -1789,6 +1796,10 @@ rebalance:
         if (p->flags & PF_MEMALLOC)
                 goto nopage;
 
+        /* Avoid allocations with no watermarks from looping endlessly */
+        if (test_thread_flag(TIF_MEMDIE) && !(gfp_mask & __GFP_NOFAIL))
+                goto nopage;
+
         /* Try direct reclaim and then allocating */
         page = __alloc_pages_direct_reclaim(gfp_mask, order,
                                         zonelist, high_zoneidx,
diff --git a/mm/swapfile.c b/mm/swapfile.c
index d1ade1a48ee7..8ffdc0d23c53 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -753,7 +753,7 @@ int swap_type_of(dev_t device, sector_t offset, struct block_device **bdev_p)
 
                 if (!bdev) {
                         if (bdev_p)
-                                *bdev_p = bdget(sis->bdev->bd_dev);
+                                *bdev_p = bdgrab(sis->bdev);
 
                         spin_unlock(&swap_lock);
                         return i;
@@ -765,7 +765,7 @@ int swap_type_of(dev_t device, sector_t offset, struct block_device **bdev_p)
                                         struct swap_extent, list);
                         if (se->start_block == offset) {
                                 if (bdev_p)
-                                        *bdev_p = bdget(sis->bdev->bd_dev);
+                                        *bdev_p = bdgrab(sis->bdev);
 
                                 spin_unlock(&swap_lock);
                                 bdput(bdev);