slub: do not assert not having lock in removing freed partial

[GitHub/exynos8895/android_kernel_samsung_universal8895.git] / mm / slub.c

diff --git a/mm/slub.c b/mm/slub.c
index 3d3a8a7a0f8c24d19360602dbe08702b4f272bfb..25f14ad8f817443bda93901aa8ab0b626280f297 100644 (file)
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1518,11 +1518,9 @@ static void discard_slab(struct kmem_cache *s, struct page *page)
 /*
  * Management of partially allocated slabs.
  */
-static inline void add_partial(struct kmem_cache_node *n,
-                               struct page *page, int tail)
+static inline void
+__add_partial(struct kmem_cache_node *n, struct page *page, int tail)
 {
-       lockdep_assert_held(&n->list_lock);
-
        n->nr_partial++;
        if (tail == DEACTIVATE_TO_TAIL)
                list_add_tail(&page->lru, &n->partial);
@@ -1530,15 +1528,27 @@ static inline void add_partial(struct kmem_cache_node *n,
                list_add(&page->lru, &n->partial);
 }
 
-static inline void remove_partial(struct kmem_cache_node *n,
-                                       struct page *page)
+static inline void add_partial(struct kmem_cache_node *n,
+                               struct page *page, int tail)
 {
        lockdep_assert_held(&n->list_lock);
+       __add_partial(n, page, tail);
+}
 
+static inline void
+__remove_partial(struct kmem_cache_node *n, struct page *page)
+{
        list_del(&page->lru);
        n->nr_partial--;
 }
 
+static inline void remove_partial(struct kmem_cache_node *n,
+                                       struct page *page)
+{
+       lockdep_assert_held(&n->list_lock);
+       __remove_partial(n, page);
+}
+
 /*
  * Remove slab from the partial list, freeze it and
  * return the pointer to the freelist.
@@ -2904,12 +2914,10 @@ static void early_kmem_cache_node_alloc(int node)
        inc_slabs_node(kmem_cache_node, node, page->objects);
 
        /*
-        * the lock is for lockdep's sake, not for any actual
-        * race protection
+        * No locks need to be taken here as it has just been
+        * initialized and there is no concurrent access.
         */
-       spin_lock(&n->list_lock);
-       add_partial(n, page, DEACTIVATE_TO_HEAD);
-       spin_unlock(&n->list_lock);
+       __add_partial(n, page, DEACTIVATE_TO_HEAD);
 }
 
 static void free_kmem_cache_nodes(struct kmem_cache *s)
@@ -3195,7 +3203,7 @@ static void free_partial(struct kmem_cache *s, struct kmem_cache_node *n)
 
        list_for_each_entry_safe(page, h, &n->partial, lru) {
                if (!page->inuse) {
-                       remove_partial(n, page);
+                       __remove_partial(n, page);
                        discard_slab(s, page);
                } else {
                        list_slab_objects(s, page,