Merge git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable

[pandora-kernel.git] / mm / slab.c

diff --git a/mm/slab.c b/mm/slab.c
index 37961d1..46a9c16 100644 (file)
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -190,22 +190,6 @@ typedef unsigned int kmem_bufctl_t;
 #define        BUFCTL_ACTIVE   (((kmem_bufctl_t)(~0U))-2)
 #define        SLAB_LIMIT      (((kmem_bufctl_t)(~0U))-3)
 
-/*
- * struct slab
- *
- * Manages the objs in a slab. Placed either at the beginning of mem allocated
- * for a slab, or allocated from an general cache.
- * Slabs are chained into three list: fully used, partial, fully free slabs.
- */
-struct slab {
-       struct list_head list;
-       unsigned long colouroff;
-       void *s_mem;            /* including colour offset */
-       unsigned int inuse;     /* num of objs active in slab */
-       kmem_bufctl_t free;
-       unsigned short nodeid;
-};
-
 /*
  * struct slab_rcu
  *
@@ -219,8 +203,6 @@ struct slab {
  *
  * rcu_read_lock before reading the address, then rcu_read_unlock after
  * taking the spinlock within the structure expected at that address.
- *
- * We assume struct slab_rcu can overlay struct slab when destroying.
  */
 struct slab_rcu {
        struct rcu_head head;
@@ -228,6 +210,27 @@ struct slab_rcu {
        void *addr;
 };
 
+/*
+ * struct slab
+ *
+ * Manages the objs in a slab. Placed either at the beginning of mem allocated
+ * for a slab, or allocated from an general cache.
+ * Slabs are chained into three list: fully used, partial, fully free slabs.
+ */
+struct slab {
+       union {
+               struct {
+                       struct list_head list;
+                       unsigned long colouroff;
+                       void *s_mem;            /* including colour offset */
+                       unsigned int inuse;     /* num of objs active in slab */
+                       kmem_bufctl_t free;
+                       unsigned short nodeid;
+               };
+               struct slab_rcu __slab_cover_slab_rcu;
+       };
+};
+
 /*
  * struct array_cache
  *
@@ -875,7 +878,7 @@ static struct array_cache *alloc_arraycache(int node, int entries,
        nc = kmalloc_node(memsize, gfp, node);
        /*
         * The array_cache structures contain pointers to free object.
-        * However, when such objects are allocated or transfered to another
+        * However, when such objects are allocated or transferred to another
         * cache the pointers are not cleared and they could be counted as
         * valid references during a kmemleak scan. Therefore, kmemleak must
         * not scan such objects.
@@ -1387,7 +1390,7 @@ static int __meminit slab_memory_callback(struct notifier_block *self,
                break;
        }
 out:
-       return ret ? notifier_from_errno(ret) : NOTIFY_OK;
+       return notifier_from_errno(ret);
 }
 #endif /* CONFIG_NUMA && CONFIG_MEMORY_HOTPLUG */
 
@@ -2147,8 +2150,6 @@ static int __init_refok setup_cpu_cache(struct kmem_cache *cachep, gfp_t gfp)
  *
  * @name must be valid until the cache is destroyed. This implies that
  * the module calling this has to destroy the cache before getting unloaded.
- * Note that kmem_cache_name() is not guaranteed to return the same pointer,
- * therefore applications must manage it themselves.
  *
  * The flags are
  *
@@ -2288,8 +2289,8 @@ kmem_cache_create (const char *name, size_t size, size_t align,
        if (ralign < align) {
                ralign = align;
        }
-       /* disable debug if not aligning with REDZONE_ALIGN */
-       if (ralign & (__alignof__(unsigned long long) - 1))
+       /* disable debug if necessary */
+       if (ralign > __alignof__(unsigned long long))
                flags &= ~(SLAB_RED_ZONE | SLAB_STORE_USER);
        /*
         * 4) Store it.
@@ -2315,8 +2316,8 @@ kmem_cache_create (const char *name, size_t size, size_t align,
         */
        if (flags & SLAB_RED_ZONE) {
                /* add space for red zone words */
-               cachep->obj_offset += align;
-               size += align + sizeof(unsigned long long);
+               cachep->obj_offset += sizeof(unsigned long long);
+               size += 2 * sizeof(unsigned long long);
        }
        if (flags & SLAB_STORE_USER) {
                /* user store requires one word storage behind the end of
@@ -2605,7 +2606,7 @@ EXPORT_SYMBOL(kmem_cache_shrink);
  *
  * The cache must be empty before calling this function.
  *
- * The caller must guarantee that noone will allocate memory from the cache
+ * The caller must guarantee that no one will allocate memory from the cache
  * during the kmem_cache_destroy().
  */
 void kmem_cache_destroy(struct kmem_cache *cachep)
@@ -3840,12 +3841,6 @@ unsigned int kmem_cache_size(struct kmem_cache *cachep)
 }
 EXPORT_SYMBOL(kmem_cache_size);
 
-const char *kmem_cache_name(struct kmem_cache *cachep)
-{
-       return cachep->name;
-}
-EXPORT_SYMBOL_GPL(kmem_cache_name);
-
 /*
  * This initializes kmem_list3 or resizes various caches for all nodes.
  */