drm/udl: take reference to device struct for dma-bufs

[~andy/linux] / mm / slub.c

diff --git a/mm/slub.c b/mm/slub.c
index 432bddf484bbf943da517f364f759ea5f448ef29..25f14ad8f817443bda93901aa8ab0b626280f297 100644 (file)
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -355,6 +355,21 @@ static __always_inline void slab_unlock(struct page *page)
        __bit_spin_unlock(PG_locked, &page->flags);
 }
 
+static inline void set_page_slub_counters(struct page *page, unsigned long counters_new)
+{
+       struct page tmp;
+       tmp.counters = counters_new;
+       /*
+        * page->counters can cover frozen/inuse/objects as well
+        * as page->_count.  If we assign to ->counters directly
+        * we run the risk of losing updates to page->_count, so
+        * be careful and only assign to the fields we need.
+        */
+       page->frozen  = tmp.frozen;
+       page->inuse   = tmp.inuse;
+       page->objects = tmp.objects;
+}
+
 /* Interrupts must be disabled (for the fallback code to work right) */
 static inline bool __cmpxchg_double_slab(struct kmem_cache *s, struct page *page,
                void *freelist_old, unsigned long counters_old,
@@ -376,7 +391,7 @@ static inline bool __cmpxchg_double_slab(struct kmem_cache *s, struct page *page
                if (page->freelist == freelist_old &&
                                        page->counters == counters_old) {
                        page->freelist = freelist_new;
-                       page->counters = counters_new;
+                       set_page_slub_counters(page, counters_new);
                        slab_unlock(page);
                        return 1;
                }
@@ -415,7 +430,7 @@ static inline bool cmpxchg_double_slab(struct kmem_cache *s, struct page *page,
                if (page->freelist == freelist_old &&
                                        page->counters == counters_old) {
                        page->freelist = freelist_new;
-                       page->counters = counters_new;
+                       set_page_slub_counters(page, counters_new);
                        slab_unlock(page);
                        local_irq_restore(flags);
                        return 1;
@@ -989,21 +1004,19 @@ static inline void slab_free_hook(struct kmem_cache *s, void *x)
 static void add_full(struct kmem_cache *s,
        struct kmem_cache_node *n, struct page *page)
 {
-       lockdep_assert_held(&n->list_lock);
-
        if (!(s->flags & SLAB_STORE_USER))
                return;
 
+       lockdep_assert_held(&n->list_lock);
        list_add(&page->lru, &n->full);
 }
 
 static void remove_full(struct kmem_cache *s, struct kmem_cache_node *n, struct page *page)
 {
-       lockdep_assert_held(&n->list_lock);
-
        if (!(s->flags & SLAB_STORE_USER))
                return;
 
+       lockdep_assert_held(&n->list_lock);
        list_del(&page->lru);
 }
 
@@ -1505,11 +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);
@@ -1517,15 +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.
@@ -2891,12 +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)
@@ -3182,7 +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,