Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6:
  slub: Allow removal of slab caches during boot
  Revert "slub: Allow removal of slab caches during boot"
  slub numa: Fix rare allocation from unexpected node
  slab: use deferable timers for its periodic housekeeping
  slub: Use kmem_cache flags to detect if slab is in debugging mode.
  slub: Allow removal of slab caches during boot
  slub: Check kasprintf results in kmem_cache_init()
  SLUB: Constants need UL
  slub: Use a constant for a unspecified node.
  SLOB: Free objects to their own list
  slab: fix caller tracking on !CONFIG_DEBUG_SLAB && CONFIG_TRACING

3 files changed, 52 insertions, 45 deletions

diff --git a/mm/slab.c b/mm/slab.c
index 47360c3e5abd..736e497733d6 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -860,7 +860,7 @@ static void __cpuinit start_cpu_timer(int cpu)
          */
         if (keventd_up() && reap_work->work.func == NULL) {
                 init_reap_node(cpu);
-                INIT_DELAYED_WORK(reap_work, cache_reap);
+                INIT_DELAYED_WORK_DEFERRABLE(reap_work, cache_reap);
                 schedule_delayed_work_on(cpu, reap_work,
                                         __round_jiffies_relative(HZ, cpu));
         }
diff --git a/mm/slob.c b/mm/slob.c
index 3f19a347dabf..d582171c8101 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -396,6 +396,7 @@ static void slob_free(void *block, int size)
         slob_t *prev, *next, *b = (slob_t *)block;
         slobidx_t units;
         unsigned long flags;
+        struct list_head *slob_list;
 
         if (unlikely(ZERO_OR_NULL_PTR(block)))
                 return;
@@ -424,7 +425,13 @@ static void slob_free(void *block, int size)
                 set_slob(b, units,
                         (void *)((unsigned long)(b +
                                         SLOB_UNITS(PAGE_SIZE)) & PAGE_MASK));
-                set_slob_page_free(sp, &free_slob_small);
+                if (size < SLOB_BREAK1)
+                        slob_list = &free_slob_small;
+                else if (size < SLOB_BREAK2)
+                        slob_list = &free_slob_medium;
+                else
+                        slob_list = &free_slob_large;
+                set_slob_page_free(sp, slob_list);
                 goto out;
         }
 
diff --git a/mm/slub.c b/mm/slub.c
index 7bb7940f4eee..13fffe1f0f3d 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -106,11 +106,17 @@
  *                      the fast path and disables lockless freelists.
  */
 
+#define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \
+                SLAB_TRACE | SLAB_DEBUG_FREE)
+
+static inline int kmem_cache_debug(struct kmem_cache *s)
+{
 #ifdef CONFIG_SLUB_DEBUG
-#define SLABDEBUG 1
+        return unlikely(s->flags & SLAB_DEBUG_FLAGS);
 #else
-#define SLABDEBUG 0
+        return 0;
 #endif
+}
 
 /*
  * Issues still to be resolved:
@@ -161,8 +167,8 @@
 #define MAX_OBJS_PER_PAGE       65535 /* since page.objects is u16 */
 
 /* Internal SLUB flags */
-#define __OBJECT_POISON         0x80000000 /* Poison object */
-#define __SYSFS_ADD_DEFERRED    0x40000000 /* Not yet visible via sysfs */
+#define __OBJECT_POISON         0x80000000UL /* Poison object */
+#define __SYSFS_ADD_DEFERRED    0x40000000UL /* Not yet visible via sysfs */
 
 static int kmem_size = sizeof(struct kmem_cache);
 
@@ -1072,7 +1078,7 @@ static inline struct page *alloc_slab_page(gfp_t flags, int node,
 
         flags |= __GFP_NOTRACK;
 
-        if (node == -1)
+        if (node == NUMA_NO_NODE)
                 return alloc_pages(flags, order);
         else
                 return alloc_pages_exact_node(node, flags, order);
@@ -1156,9 +1162,6 @@ static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node)
         inc_slabs_node(s, page_to_nid(page), page->objects);
         page->slab = s;
         page->flags |= 1 << PG_slab;
-        if (s->flags & (SLAB_DEBUG_FREE | SLAB_RED_ZONE | SLAB_POISON |
-                        SLAB_STORE_USER | SLAB_TRACE))
-                __SetPageSlubDebug(page);
 
         start = page_address(page);
 
@@ -1185,14 +1188,13 @@ static void __free_slab(struct kmem_cache *s, struct page *page)
         int order = compound_order(page);
         int pages = 1 << order;
 
-        if (unlikely(SLABDEBUG && PageSlubDebug(page))) {
+        if (kmem_cache_debug(s)) {
                 void *p;
 
                 slab_pad_check(s, page);
                 for_each_object(p, s, page_address(page),
                                                 page->objects)
                         check_object(s, page, p, 0);
-                __ClearPageSlubDebug(page);
         }
 
         kmemcheck_free_shadow(page, compound_order(page));
@@ -1386,10 +1388,10 @@ static struct page *get_any_partial(struct kmem_cache *s, gfp_t flags)
 static struct page *get_partial(struct kmem_cache *s, gfp_t flags, int node)
 {
         struct page *page;
-        int searchnode = (node == -1) ? numa_node_id() : node;
+        int searchnode = (node == NUMA_NO_NODE) ? numa_node_id() : node;
 
         page = get_partial_node(get_node(s, searchnode));
-        if (page || (flags & __GFP_THISNODE))
+        if (page || node != -1)
                 return page;
 
         return get_any_partial(s, flags);
@@ -1414,8 +1416,7 @@ static void unfreeze_slab(struct kmem_cache *s, struct page *page, int tail)
                         stat(s, tail ? DEACTIVATE_TO_TAIL : DEACTIVATE_TO_HEAD);
                 } else {
                         stat(s, DEACTIVATE_FULL);
-                        if (SLABDEBUG && PageSlubDebug(page) &&
-                                                (s->flags & SLAB_STORE_USER))
+                        if (kmem_cache_debug(s) && (s->flags & SLAB_STORE_USER))
                                 add_full(n, page);
                 }
                 slab_unlock(page);
@@ -1514,7 +1515,7 @@ static void flush_all(struct kmem_cache *s)
 static inline int node_match(struct kmem_cache_cpu *c, int node)
 {
 #ifdef CONFIG_NUMA
-        if (node != -1 && c->node != node)
+        if (node != NUMA_NO_NODE && c->node != node)
                 return 0;
 #endif
         return 1;
@@ -1623,7 +1624,7 @@ load_freelist:
         object = c->page->freelist;
         if (unlikely(!object))
                 goto another_slab;
-        if (unlikely(SLABDEBUG && PageSlubDebug(c->page)))
+        if (kmem_cache_debug(s))
                 goto debug;
 
         c->freelist = get_freepointer(s, object);
@@ -1726,7 +1727,7 @@ static __always_inline void *slab_alloc(struct kmem_cache *s,
 
 void *kmem_cache_alloc(struct kmem_cache *s, gfp_t gfpflags)
 {
-        void *ret = slab_alloc(s, gfpflags, -1, _RET_IP_);
+        void *ret = slab_alloc(s, gfpflags, NUMA_NO_NODE, _RET_IP_);
 
         trace_kmem_cache_alloc(_RET_IP_, ret, s->objsize, s->size, gfpflags);
 
@@ -1737,7 +1738,7 @@ EXPORT_SYMBOL(kmem_cache_alloc);
 #ifdef CONFIG_TRACING
 void *kmem_cache_alloc_notrace(struct kmem_cache *s, gfp_t gfpflags)
 {
-        return slab_alloc(s, gfpflags, -1, _RET_IP_);
+        return slab_alloc(s, gfpflags, NUMA_NO_NODE, _RET_IP_);
 }
 EXPORT_SYMBOL(kmem_cache_alloc_notrace);
 #endif
@@ -1782,7 +1783,7 @@ static void __slab_free(struct kmem_cache *s, struct page *page,
         stat(s, FREE_SLOWPATH);
         slab_lock(page);
 
-        if (unlikely(SLABDEBUG && PageSlubDebug(page)))
+        if (kmem_cache_debug(s))
                 goto debug;
 
 checks_ok:
@@ -2489,7 +2490,6 @@ void kmem_cache_destroy(struct kmem_cache *s)
         s->refcount--;
         if (!s->refcount) {
                 list_del(&s->list);
-                up_write(&slub_lock);
                 if (kmem_cache_close(s)) {
                         printk(KERN_ERR "SLUB %s: %s called for cache that "
                                 "still has objects.\n", s->name, __func__);
@@ -2498,8 +2498,8 @@ void kmem_cache_destroy(struct kmem_cache *s)
                 if (s->flags & SLAB_DESTROY_BY_RCU)
                         rcu_barrier();
                 sysfs_slab_remove(s);
-        } else
-                up_write(&slub_lock);
+        }
+        up_write(&slub_lock);
 }
 EXPORT_SYMBOL(kmem_cache_destroy);
 
@@ -2727,7 +2727,7 @@ void *__kmalloc(size_t size, gfp_t flags)
         if (unlikely(ZERO_OR_NULL_PTR(s)))
                 return s;
 
-        ret = slab_alloc(s, flags, -1, _RET_IP_);
+        ret = slab_alloc(s, flags, NUMA_NO_NODE, _RET_IP_);
 
         trace_kmalloc(_RET_IP_, ret, size, s->size, flags);
 
@@ -3117,9 +3117,12 @@ void __init kmem_cache_init(void)
         slab_state = UP;
 
         /* Provide the correct kmalloc names now that the caches are up */
-        for (i = KMALLOC_SHIFT_LOW; i < SLUB_PAGE_SHIFT; i++)
-                kmalloc_caches[i]. name =
-                        kasprintf(GFP_NOWAIT, "kmalloc-%d", 1 << i);
+        for (i = KMALLOC_SHIFT_LOW; i < SLUB_PAGE_SHIFT; i++) {
+                char *s = kasprintf(GFP_NOWAIT, "kmalloc-%d", 1 << i);
+
+                BUG_ON(!s);
+                kmalloc_caches[i].name = s;
+        }
 
 #ifdef CONFIG_SMP
         register_cpu_notifier(&slab_notifier);
@@ -3222,14 +3225,12 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size,
                  */
                 s->objsize = max(s->objsize, (int)size);
                 s->inuse = max_t(int, s->inuse, ALIGN(size, sizeof(void *)));
-                up_write(&slub_lock);
 
                 if (sysfs_slab_alias(s, name)) {
-                        down_write(&slub_lock);
                         s->refcount--;
-                        up_write(&slub_lock);
                         goto err;
                 }
+                up_write(&slub_lock);
                 return s;
         }
 
@@ -3238,14 +3239,12 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size,
                 if (kmem_cache_open(s, GFP_KERNEL, name,
                                 size, align, flags, ctor)) {
                         list_add(&s->list, &slab_caches);
-                        up_write(&slub_lock);
                         if (sysfs_slab_add(s)) {
-                                down_write(&slub_lock);
                                 list_del(&s->list);
-                                up_write(&slub_lock);
                                 kfree(s);
                                 goto err;
                         }
+                        up_write(&slub_lock);
                         return s;
                 }
                 kfree(s);
@@ -3311,7 +3310,7 @@ void *__kmalloc_track_caller(size_t size, gfp_t gfpflags, unsigned long caller)
         if (unlikely(ZERO_OR_NULL_PTR(s)))
                 return s;
 
-        ret = slab_alloc(s, gfpflags, -1, caller);
+        ret = slab_alloc(s, gfpflags, NUMA_NO_NODE, caller);
 
         /* Honor the call site pointer we recieved. */
         trace_kmalloc(caller, ret, size, s->size, gfpflags);
@@ -3394,16 +3393,6 @@ static void validate_slab_slab(struct kmem_cache *s, struct page *page,
         } else
                 printk(KERN_INFO "SLUB %s: Skipped busy slab 0x%p\n",
                         s->name, page);
-
-        if (s->flags & DEBUG_DEFAULT_FLAGS) {
-                if (!PageSlubDebug(page))
-                        printk(KERN_ERR "SLUB %s: SlubDebug not set "
-                                "on slab 0x%p\n", s->name, page);
-        } else {
-                if (PageSlubDebug(page))
-                        printk(KERN_ERR "SLUB %s: SlubDebug set on "
-                                "slab 0x%p\n", s->name, page);
-        }
 }
 
 static int validate_slab_node(struct kmem_cache *s,
@@ -4503,6 +4492,13 @@ static int sysfs_slab_add(struct kmem_cache *s)
 
 static void sysfs_slab_remove(struct kmem_cache *s)
 {
+        if (slab_state < SYSFS)
+                /*
+                 * Sysfs has not been setup yet so no need to remove the
+                 * cache from sysfs.
+                 */
+                return;
+
         kobject_uevent(&s->kobj, KOBJ_REMOVE);
         kobject_del(&s->kobj);
         kobject_put(&s->kobj);
@@ -4548,8 +4544,11 @@ static int __init slab_sysfs_init(void)
         struct kmem_cache *s;
         int err;
 
+        down_write(&slub_lock);
+
         slab_kset = kset_create_and_add("slab", &slab_uevent_ops, kernel_kobj);
         if (!slab_kset) {
+                up_write(&slub_lock);
                 printk(KERN_ERR "Cannot register slab subsystem.\n");
                 return -ENOSYS;
         }
@@ -4574,6 +4573,7 @@ static int __init slab_sysfs_init(void)
                 kfree(al);
         }
 
+        up_write(&slub_lock);
         resiliency_test();
         return 0;
 }