slab, lockdep: Annotate slab -> rcu -> debug_object -> slab

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

diff --git a/mm/slab.c b/mm/slab.c
index 1e523ed..0703578 100644 (file)
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -622,6 +622,51 @@ int slab_is_available(void)
 static struct lock_class_key on_slab_l3_key;
 static struct lock_class_key on_slab_alc_key;
 
+static struct lock_class_key debugobj_l3_key;
+static struct lock_class_key debugobj_alc_key;
+
+static void slab_set_lock_classes(struct kmem_cache *cachep,
+               struct lock_class_key *l3_key, struct lock_class_key *alc_key,
+               int q)
+{
+       struct array_cache **alc;
+       struct kmem_list3 *l3;
+       int r;
+
+       l3 = cachep->nodelists[q];
+       if (!l3)
+               return;
+
+       lockdep_set_class(&l3->list_lock, l3_key);
+       alc = l3->alien;
+       /*
+        * FIXME: This check for BAD_ALIEN_MAGIC
+        * should go away when common slab code is taught to
+        * work even without alien caches.
+        * Currently, non NUMA code returns BAD_ALIEN_MAGIC
+        * for alloc_alien_cache,
+        */
+       if (!alc || (unsigned long)alc == BAD_ALIEN_MAGIC)
+               return;
+       for_each_node(r) {
+               if (alc[r])
+                       lockdep_set_class(&alc[r]->lock, alc_key);
+       }
+}
+
+static void slab_set_debugobj_lock_classes_node(struct kmem_cache *cachep, int node)
+{
+       slab_set_lock_classes(cachep, &debugobj_l3_key, &debugobj_alc_key, node);
+}
+
+static void slab_set_debugobj_lock_classes(struct kmem_cache *cachep)
+{
+       int node;
+
+       for_each_online_node(node)
+               slab_set_debugobj_lock_classes_node(cachep, node);
+}
+
 static void init_node_lock_keys(int q)
 {
        struct cache_sizes *s = malloc_sizes;
@@ -630,29 +675,14 @@ static void init_node_lock_keys(int q)
                return;
 
        for (s = malloc_sizes; s->cs_size != ULONG_MAX; s++) {
-               struct array_cache **alc;
                struct kmem_list3 *l3;
-               int r;
 
                l3 = s->cs_cachep->nodelists[q];
                if (!l3 || OFF_SLAB(s->cs_cachep))
                        continue;
-               lockdep_set_class(&l3->list_lock, &on_slab_l3_key);
-               alc = l3->alien;
-               /*
-                * FIXME: This check for BAD_ALIEN_MAGIC
-                * should go away when common slab code is taught to
-                * work even without alien caches.
-                * Currently, non NUMA code returns BAD_ALIEN_MAGIC
-                * for alloc_alien_cache,
-                */
-               if (!alc || (unsigned long)alc == BAD_ALIEN_MAGIC)
-                       continue;
-               for_each_node(r) {
-                       if (alc[r])
-                               lockdep_set_class(&alc[r]->lock,
-                                       &on_slab_alc_key);
-               }
+
+               slab_set_lock_classes(s->cs_cachep, &on_slab_l3_key,
+                               &on_slab_alc_key, q);
        }
 }
 
@@ -671,6 +701,14 @@ static void init_node_lock_keys(int q)
 static inline void init_lock_keys(void)
 {
 }
+
+static void slab_set_debugobj_lock_classes_node(struct kmem_cache *cachep, int node)
+{
+}
+
+static void slab_set_debugobj_lock_classes(struct kmem_cache *cachep)
+{
+}
 #endif
 
 /*
@@ -1264,6 +1302,8 @@ static int __cpuinit cpuup_prepare(long cpu)
                spin_unlock_irq(&l3->list_lock);
                kfree(shared);
                free_alien_cache(alien);
+               if (cachep->flags & SLAB_DEBUG_OBJECTS)
+                       slab_set_debugobj_lock_classes_node(cachep, node);
        }
        init_node_lock_keys(node);
 
@@ -2426,6 +2466,16 @@ kmem_cache_create (const char *name, size_t size, size_t align,
                goto oops;
        }
 
+       if (flags & SLAB_DEBUG_OBJECTS) {
+               /*
+                * Would deadlock through slab_destroy()->call_rcu()->
+                * debug_object_activate()->kmem_cache_alloc().
+                */
+               WARN_ON_ONCE(flags & SLAB_DESTROY_BY_RCU);
+
+               slab_set_debugobj_lock_classes(cachep);
+       }
+
        /* cache setup completed, link it into the list */
        list_add(&cachep->next, &cache_chain);
 oops:
@@ -3403,7 +3453,7 @@ __cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid,
        cache_alloc_debugcheck_before(cachep, flags);
        local_irq_save(save_flags);
 
-       if (nodeid == -1)
+       if (nodeid == NUMA_NO_NODE)
                nodeid = slab_node;
 
        if (unlikely(!cachep->nodelists[nodeid])) {
@@ -3934,7 +3984,7 @@ fail:
 
 struct ccupdate_struct {
        struct kmem_cache *cachep;
-       struct array_cache *new[NR_CPUS];
+       struct array_cache *new[0];
 };
 
 static void do_ccupdate_local(void *info)
@@ -3956,7 +4006,8 @@ static int do_tune_cpucache(struct kmem_cache *cachep, int limit,
        struct ccupdate_struct *new;
        int i;
 
-       new = kzalloc(sizeof(*new), gfp);
+       new = kzalloc(sizeof(*new) + nr_cpu_ids * sizeof(struct array_cache *),
+                     gfp);
        if (!new)
                return -ENOMEM;