From 7c9adf5a5471647f392169ef19d3e81dcfa76045 Mon Sep 17 00:00:00 2001
From: Christoph Lameter
Date: Tue, 4 Sep 2012 23:38:33 +0000
Subject: mm/sl[aou]b: Move list_add() to slab_common.c

Move the code to append the new kmem_cache to the list of slab caches to
the kmem_cache_create code in the shared code.

This is possible now since the acquisition of the mutex was moved into
kmem_cache_create().

Acked-by: David Rientjes <rientjes@google.com>
Reviewed-by: Glauber Costa <glommer@parallels.com>
Reviewed-by: Joonsoo Kim <js1304@gmail.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
---
 mm/slob.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'mm/slob.c')

diff --git a/mm/slob.c b/mm/slob.c
index 45d4ca79933a..5225d28f2694 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -540,6 +540,10 @@ struct kmem_cache *__kmem_cache_create(const char *name, size_t size,
 
 void kmem_cache_destroy(struct kmem_cache *c)
 {
+	mutex_lock(&slab_mutex);
+	list_del(&c->list);
+	mutex_unlock(&slab_mutex);
+
 	kmemleak_free(c);
 	if (c->flags & SLAB_DESTROY_BY_RCU)
 		rcu_barrier();
-- 
cgit v1.2.3-55-g7522


From 945cf2b6199be70ff03102b9e642c3bb05d01de9 Mon Sep 17 00:00:00 2001
From: Christoph Lameter
Date: Tue, 4 Sep 2012 23:18:33 +0000
Subject: mm/sl[aou]b: Extract a common function for kmem_cache_destroy

kmem_cache_destroy does basically the same in all allocators.

Extract common code which is easy since we already have common mutex
handling.

Reviewed-by: Glauber Costa <glommer@parallels.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
---
 mm/slab.c        | 45 +++------------------------------------------
 mm/slab.h        |  3 +++
 mm/slab_common.c | 25 +++++++++++++++++++++++++
 mm/slob.c        | 15 +++++++--------
 mm/slub.c        | 36 +++++++++++-------------------------
 5 files changed, 49 insertions(+), 75 deletions(-)

(limited to 'mm/slob.c')

diff --git a/mm/slab.c b/mm/slab.c
index a69903168497..49a74b349e39 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2206,7 +2206,7 @@ static void slab_destroy(struct kmem_cache *cachep, struct slab *slabp)
 	}
 }
 
-static void __kmem_cache_destroy(struct kmem_cache *cachep)
+void __kmem_cache_destroy(struct kmem_cache *cachep)
 {
 	int i;
 	struct kmem_list3 *l3;
@@ -2763,49 +2763,10 @@ int kmem_cache_shrink(struct kmem_cache *cachep)
 }
 EXPORT_SYMBOL(kmem_cache_shrink);
 
-/**
- * kmem_cache_destroy - delete a cache
- * @cachep: the cache to destroy
- *
- * Remove a &struct kmem_cache object from the slab cache.
- *
- * It is expected this function will be called by a module when it is
- * unloaded.  This will remove the cache completely, and avoid a duplicate
- * cache being allocated each time a module is loaded and unloaded, if the
- * module doesn't have persistent in-kernel storage across loads and unloads.
- *
- * The cache must be empty before calling this function.
- *
- * 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)
+int __kmem_cache_shutdown(struct kmem_cache *cachep)
 {
-	BUG_ON(!cachep || in_interrupt());
-
-	/* Find the cache in the chain of caches. */
-	get_online_cpus();
-	mutex_lock(&slab_mutex);
-	/*
-	 * the chain is never empty, cache_cache is never destroyed
-	 */
-	list_del(&cachep->list);
-	if (__cache_shrink(cachep)) {
-		slab_error(cachep, "Can't free all objects");
-		list_add(&cachep->list, &slab_caches);
-		mutex_unlock(&slab_mutex);
-		put_online_cpus();
-		return;
-	}
-
-	if (unlikely(cachep->flags & SLAB_DESTROY_BY_RCU))
-		rcu_barrier();
-
-	__kmem_cache_destroy(cachep);
-	mutex_unlock(&slab_mutex);
-	put_online_cpus();
+	return __cache_shrink(cachep);
 }
-EXPORT_SYMBOL(kmem_cache_destroy);
 
 /*
  * Get the memory for a slab management obj.
diff --git a/mm/slab.h b/mm/slab.h
index db7848caaa25..07a537ed5da3 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -30,4 +30,7 @@ extern struct list_head slab_caches;
 struct kmem_cache *__kmem_cache_create(const char *name, size_t size,
 	size_t align, unsigned long flags, void (*ctor)(void *));
 
+int __kmem_cache_shutdown(struct kmem_cache *);
+void __kmem_cache_destroy(struct kmem_cache *);
+
 #endif
diff --git a/mm/slab_common.c b/mm/slab_common.c
index 5190a7cd02bd..a1c4f0b5aaed 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -140,6 +140,31 @@ out_locked:
 }
 EXPORT_SYMBOL(kmem_cache_create);
 
+void kmem_cache_destroy(struct kmem_cache *s)
+{
+	get_online_cpus();
+	mutex_lock(&slab_mutex);
+	s->refcount--;
+	if (!s->refcount) {
+		list_del(&s->list);
+
+		if (!__kmem_cache_shutdown(s)) {
+			if (s->flags & SLAB_DESTROY_BY_RCU)
+				rcu_barrier();
+
+			__kmem_cache_destroy(s);
+		} else {
+			list_add(&s->list, &slab_caches);
+			printk(KERN_ERR "kmem_cache_destroy %s: Slab cache still has objects\n",
+				s->name);
+			dump_stack();
+		}
+	}
+	mutex_unlock(&slab_mutex);
+	put_online_cpus();
+}
+EXPORT_SYMBOL(kmem_cache_destroy);
+
 int slab_is_available(void)
 {
 	return slab_state >= UP;
diff --git a/mm/slob.c b/mm/slob.c
index 5225d28f2694..289be4f4681a 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -538,18 +538,11 @@ struct kmem_cache *__kmem_cache_create(const char *name, size_t size,
 	return c;
 }
 
-void kmem_cache_destroy(struct kmem_cache *c)
+void __kmem_cache_destroy(struct kmem_cache *c)
 {
-	mutex_lock(&slab_mutex);
-	list_del(&c->list);
-	mutex_unlock(&slab_mutex);
-
 	kmemleak_free(c);
-	if (c->flags & SLAB_DESTROY_BY_RCU)
-		rcu_barrier();
 	slob_free(c, sizeof(struct kmem_cache));
 }
-EXPORT_SYMBOL(kmem_cache_destroy);
 
 void *kmem_cache_alloc_node(struct kmem_cache *c, gfp_t flags, int node)
 {
@@ -617,6 +610,12 @@ unsigned int kmem_cache_size(struct kmem_cache *c)
 }
 EXPORT_SYMBOL(kmem_cache_size);
 
+int __kmem_cache_shutdown(struct kmem_cache *c)
+{
+	/* No way to check for remaining objects */
+	return 0;
+}
+
 int kmem_cache_shrink(struct kmem_cache *d)
 {
 	return 0;
diff --git a/mm/slub.c b/mm/slub.c
index 24aa362edef7..724adea34384 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -624,7 +624,7 @@ static void object_err(struct kmem_cache *s, struct page *page,
 	print_trailer(s, page, object);
 }
 
-static void slab_err(struct kmem_cache *s, struct page *page, char *fmt, ...)
+static void slab_err(struct kmem_cache *s, struct page *page, const char *fmt, ...)
 {
 	va_list args;
 	char buf[100];
@@ -3146,7 +3146,7 @@ static void list_slab_objects(struct kmem_cache *s, struct page *page,
 				     sizeof(long), GFP_ATOMIC);
 	if (!map)
 		return;
-	slab_err(s, page, "%s", text);
+	slab_err(s, page, text, s->name);
 	slab_lock(page);
 
 	get_map(s, page, map);
@@ -3178,7 +3178,7 @@ static void free_partial(struct kmem_cache *s, struct kmem_cache_node *n)
 			discard_slab(s, page);
 		} else {
 			list_slab_objects(s, page,
-				"Objects remaining on kmem_cache_close()");
+			"Objects remaining in %s on kmem_cache_close()");
 		}
 	}
 }
@@ -3191,7 +3191,6 @@ static inline int kmem_cache_close(struct kmem_cache *s)
 	int node;
 
 	flush_all(s);
-	free_percpu(s->cpu_slab);
 	/* Attempt to free all objects */
 	for_each_node_state(node, N_NORMAL_MEMORY) {
 		struct kmem_cache_node *n = get_node(s, node);
@@ -3200,33 +3199,20 @@ static inline int kmem_cache_close(struct kmem_cache *s)
 		if (n->nr_partial || slabs_node(s, node))
 			return 1;
 	}
+	free_percpu(s->cpu_slab);
 	free_kmem_cache_nodes(s);
 	return 0;
 }
 
-/*
- * Close a cache and release the kmem_cache structure
- * (must be used for caches created using kmem_cache_create)
- */
-void kmem_cache_destroy(struct kmem_cache *s)
+int __kmem_cache_shutdown(struct kmem_cache *s)
 {
-	mutex_lock(&slab_mutex);
-	s->refcount--;
-	if (!s->refcount) {
-		list_del(&s->list);
-		mutex_unlock(&slab_mutex);
-		if (kmem_cache_close(s)) {
-			printk(KERN_ERR "SLUB %s: %s called for cache that "
-				"still has objects.\n", s->name, __func__);
-			dump_stack();
-		}
-		if (s->flags & SLAB_DESTROY_BY_RCU)
-			rcu_barrier();
-		sysfs_slab_remove(s);
-	} else
-		mutex_unlock(&slab_mutex);
+	return kmem_cache_close(s);
+}
+
+void __kmem_cache_destroy(struct kmem_cache *s)
+{
+	sysfs_slab_remove(s);
 }
-EXPORT_SYMBOL(kmem_cache_destroy);
 
 /********************************************************************
  *		Kmalloc subsystem
-- 
cgit v1.2.3-55-g7522


From 9b030cb865f137e1574596983face2a07e41e8b2 Mon Sep 17 00:00:00 2001
From: Christoph Lameter
Date: Wed, 5 Sep 2012 00:20:33 +0000
Subject: mm/sl[aou]b: Use "kmem_cache" name for slab cache with kmem_cache
 struct

Make all allocators use the "kmem_cache" slabname for the "kmem_cache"
structure.

Reviewed-by: Glauber Costa <glommer@parallels.com>
Reviewed-by: Joonsoo Kim <js1304@gmail.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
---
 mm/slab.c        | 72 +++++++++++++++++++++++++++++---------------------------
 mm/slab.h        |  6 +++++
 mm/slab_common.c |  1 +
 mm/slob.c        |  8 +++++++
 mm/slub.c        |  2 --
 5 files changed, 52 insertions(+), 37 deletions(-)

(limited to 'mm/slob.c')

diff --git a/mm/slab.c b/mm/slab.c
index 49a74b349e39..ef94799a1aa5 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -578,9 +578,9 @@ static struct arraycache_init initarray_generic =
     { {0, BOOT_CPUCACHE_ENTRIES, 1, 0} };
 
 /* internal cache of cache description objs */
-static struct kmem_list3 *cache_cache_nodelists[MAX_NUMNODES];
-static struct kmem_cache cache_cache = {
-	.nodelists = cache_cache_nodelists,
+static struct kmem_list3 *kmem_cache_nodelists[MAX_NUMNODES];
+static struct kmem_cache kmem_cache_boot = {
+	.nodelists = kmem_cache_nodelists,
 	.batchcount = 1,
 	.limit = BOOT_CPUCACHE_ENTRIES,
 	.shared = 1,
@@ -1594,15 +1594,17 @@ void __init kmem_cache_init(void)
 	int order;
 	int node;
 
+	kmem_cache = &kmem_cache_boot;
+
 	if (num_possible_nodes() == 1)
 		use_alien_caches = 0;
 
 	for (i = 0; i < NUM_INIT_LISTS; i++) {
 		kmem_list3_init(&initkmem_list3[i]);
 		if (i < MAX_NUMNODES)
-			cache_cache.nodelists[i] = NULL;
+			kmem_cache->nodelists[i] = NULL;
 	}
-	set_up_list3s(&cache_cache, CACHE_CACHE);
+	set_up_list3s(kmem_cache, CACHE_CACHE);
 
 	/*
 	 * Fragmentation resistance on low memory - only use bigger
@@ -1614,9 +1616,9 @@ void __init kmem_cache_init(void)
 
 	/* Bootstrap is tricky, because several objects are allocated
 	 * from caches that do not exist yet:
-	 * 1) initialize the cache_cache cache: it contains the struct
-	 *    kmem_cache structures of all caches, except cache_cache itself:
-	 *    cache_cache is statically allocated.
+	 * 1) initialize the kmem_cache cache: it contains the struct
+	 *    kmem_cache structures of all caches, except kmem_cache itself:
+	 *    kmem_cache is statically allocated.
 	 *    Initially an __init data area is used for the head array and the
 	 *    kmem_list3 structures, it's replaced with a kmalloc allocated
 	 *    array at the end of the bootstrap.
@@ -1625,43 +1627,43 @@ void __init kmem_cache_init(void)
 	 *    An __init data area is used for the head array.
 	 * 3) Create the remaining kmalloc caches, with minimally sized
 	 *    head arrays.
-	 * 4) Replace the __init data head arrays for cache_cache and the first
+	 * 4) Replace the __init data head arrays for kmem_cache and the first
 	 *    kmalloc cache with kmalloc allocated arrays.
-	 * 5) Replace the __init data for kmem_list3 for cache_cache and
+	 * 5) Replace the __init data for kmem_list3 for kmem_cache and
 	 *    the other cache's with kmalloc allocated memory.
 	 * 6) Resize the head arrays of the kmalloc caches to their final sizes.
 	 */
 
 	node = numa_mem_id();
 
-	/* 1) create the cache_cache */
+	/* 1) create the kmem_cache */
 	INIT_LIST_HEAD(&slab_caches);
-	list_add(&cache_cache.list, &slab_caches);
-	cache_cache.colour_off = cache_line_size();
-	cache_cache.array[smp_processor_id()] = &initarray_cache.cache;
-	cache_cache.nodelists[node] = &initkmem_list3[CACHE_CACHE + node];
+	list_add(&kmem_cache->list, &slab_caches);
+	kmem_cache->colour_off = cache_line_size();
+	kmem_cache->array[smp_processor_id()] = &initarray_cache.cache;
+	kmem_cache->nodelists[node] = &initkmem_list3[CACHE_CACHE + node];
 
 	/*
 	 * struct kmem_cache size depends on nr_node_ids & nr_cpu_ids
 	 */
-	cache_cache.size = offsetof(struct kmem_cache, array[nr_cpu_ids]) +
+	kmem_cache->size = offsetof(struct kmem_cache, array[nr_cpu_ids]) +
 				  nr_node_ids * sizeof(struct kmem_list3 *);
-	cache_cache.object_size = cache_cache.size;
-	cache_cache.size = ALIGN(cache_cache.size,
+	kmem_cache->object_size = kmem_cache->size;
+	kmem_cache->size = ALIGN(kmem_cache->object_size,
 					cache_line_size());
-	cache_cache.reciprocal_buffer_size =
-		reciprocal_value(cache_cache.size);
+	kmem_cache->reciprocal_buffer_size =
+		reciprocal_value(kmem_cache->size);
 
 	for (order = 0; order < MAX_ORDER; order++) {
-		cache_estimate(order, cache_cache.size,
-			cache_line_size(), 0, &left_over, &cache_cache.num);
-		if (cache_cache.num)
+		cache_estimate(order, kmem_cache->size,
+			cache_line_size(), 0, &left_over, &kmem_cache->num);
+		if (kmem_cache->num)
 			break;
 	}
-	BUG_ON(!cache_cache.num);
-	cache_cache.gfporder = order;
-	cache_cache.colour = left_over / cache_cache.colour_off;
-	cache_cache.slab_size = ALIGN(cache_cache.num * sizeof(kmem_bufctl_t) +
+	BUG_ON(!kmem_cache->num);
+	kmem_cache->gfporder = order;
+	kmem_cache->colour = left_over / kmem_cache->colour_off;
+	kmem_cache->slab_size = ALIGN(kmem_cache->num * sizeof(kmem_bufctl_t) +
 				      sizeof(struct slab), cache_line_size());
 
 	/* 2+3) create the kmalloc caches */
@@ -1728,15 +1730,15 @@ void __init kmem_cache_init(void)
 
 		ptr = kmalloc(sizeof(struct arraycache_init), GFP_NOWAIT);
 
-		BUG_ON(cpu_cache_get(&cache_cache) != &initarray_cache.cache);
-		memcpy(ptr, cpu_cache_get(&cache_cache),
+		BUG_ON(cpu_cache_get(kmem_cache) != &initarray_cache.cache);
+		memcpy(ptr, cpu_cache_get(kmem_cache),
 		       sizeof(struct arraycache_init));
 		/*
 		 * Do not assume that spinlocks can be initialized via memcpy:
 		 */
 		spin_lock_init(&ptr->lock);
 
-		cache_cache.array[smp_processor_id()] = ptr;
+		kmem_cache->array[smp_processor_id()] = ptr;
 
 		ptr = kmalloc(sizeof(struct arraycache_init), GFP_NOWAIT);
 
@@ -1757,7 +1759,7 @@ void __init kmem_cache_init(void)
 		int nid;
 
 		for_each_online_node(nid) {
-			init_list(&cache_cache, &initkmem_list3[CACHE_CACHE + nid], nid);
+			init_list(kmem_cache, &initkmem_list3[CACHE_CACHE + nid], nid);
 
 			init_list(malloc_sizes[INDEX_AC].cs_cachep,
 				  &initkmem_list3[SIZE_AC + nid], nid);
@@ -2223,7 +2225,7 @@ void __kmem_cache_destroy(struct kmem_cache *cachep)
 			kfree(l3);
 		}
 	}
-	kmem_cache_free(&cache_cache, cachep);
+	kmem_cache_free(kmem_cache, cachep);
 }
 
 
@@ -2473,7 +2475,7 @@ __kmem_cache_create (const char *name, size_t size, size_t align,
 		gfp = GFP_NOWAIT;
 
 	/* Get cache's description obj. */
-	cachep = kmem_cache_zalloc(&cache_cache, gfp);
+	cachep = kmem_cache_zalloc(kmem_cache, gfp);
 	if (!cachep)
 		return NULL;
 
@@ -2531,7 +2533,7 @@ __kmem_cache_create (const char *name, size_t size, size_t align,
 	if (!cachep->num) {
 		printk(KERN_ERR
 		       "kmem_cache_create: couldn't create cache %s.\n", name);
-		kmem_cache_free(&cache_cache, cachep);
+		kmem_cache_free(kmem_cache, cachep);
 		return NULL;
 	}
 	slab_size = ALIGN(cachep->num * sizeof(kmem_bufctl_t)
@@ -3299,7 +3301,7 @@ static void *cache_alloc_debugcheck_after(struct kmem_cache *cachep,
 
 static bool slab_should_failslab(struct kmem_cache *cachep, gfp_t flags)
 {
-	if (cachep == &cache_cache)
+	if (cachep == kmem_cache)
 		return false;
 
 	return should_failslab(cachep->object_size, flags, cachep->flags);
diff --git a/mm/slab.h b/mm/slab.h
index 07a537ed5da3..6724aa6f662f 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -25,8 +25,14 @@ extern enum slab_state slab_state;
 
 /* The slab cache mutex protects the management structures during changes */
 extern struct mutex slab_mutex;
+
+/* The list of all slab caches on the system */
 extern struct list_head slab_caches;
 
+/* The slab cache that manages slab cache information */
+extern struct kmem_cache *kmem_cache;
+
+/* Functions provided by the slab allocators */
 struct kmem_cache *__kmem_cache_create(const char *name, size_t size,
 	size_t align, unsigned long flags, void (*ctor)(void *));
 
diff --git a/mm/slab_common.c b/mm/slab_common.c
index a1c4f0b5aaed..5374150f5486 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -22,6 +22,7 @@
 enum slab_state slab_state;
 LIST_HEAD(slab_caches);
 DEFINE_MUTEX(slab_mutex);
+struct kmem_cache *kmem_cache;
 
 #ifdef CONFIG_DEBUG_VM
 static int kmem_cache_sanity_check(const char *name, size_t size)
diff --git a/mm/slob.c b/mm/slob.c
index 289be4f4681a..7d272c3dcc08 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -622,8 +622,16 @@ int kmem_cache_shrink(struct kmem_cache *d)
 }
 EXPORT_SYMBOL(kmem_cache_shrink);
 
+struct kmem_cache kmem_cache_boot = {
+	.name = "kmem_cache",
+	.size = sizeof(struct kmem_cache),
+	.flags = SLAB_PANIC,
+	.align = ARCH_KMALLOC_MINALIGN,
+};
+
 void __init kmem_cache_init(void)
 {
+	kmem_cache = &kmem_cache_boot;
 	slab_state = UP;
 }
 
diff --git a/mm/slub.c b/mm/slub.c
index 724adea34384..e0d1e0470309 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3221,8 +3221,6 @@ void __kmem_cache_destroy(struct kmem_cache *s)
 struct kmem_cache *kmalloc_caches[SLUB_PAGE_SHIFT];
 EXPORT_SYMBOL(kmalloc_caches);
 
-static struct kmem_cache *kmem_cache;
-
 #ifdef CONFIG_ZONE_DMA
 static struct kmem_cache *kmalloc_dma_caches[SLUB_PAGE_SHIFT];
 #endif
-- 
cgit v1.2.3-55-g7522


From 8f4c765c22deee766319ae9a1db68325f14816e6 Mon Sep 17 00:00:00 2001
From: Christoph Lameter
Date: Wed, 5 Sep 2012 00:18:32 +0000
Subject: mm/sl[aou]b: Move freeing of kmem_cache structure to common code

The freeing action is basically the same in all slab allocators.
Move to the common kmem_cache_destroy() function.

Reviewed-by: Glauber Costa <glommer@parallels.com>
Reviewed-by: Joonsoo Kim <js1304@gmail.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
---
 mm/slab.c        | 1 -
 mm/slab_common.c | 1 +
 mm/slob.c        | 2 --
 mm/slub.c        | 2 --
 4 files changed, 1 insertion(+), 5 deletions(-)

(limited to 'mm/slob.c')

diff --git a/mm/slab.c b/mm/slab.c
index ef94799a1aa5..8ca6ec6301fa 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2225,7 +2225,6 @@ void __kmem_cache_destroy(struct kmem_cache *cachep)
 			kfree(l3);
 		}
 	}
-	kmem_cache_free(kmem_cache, cachep);
 }
 
 
diff --git a/mm/slab_common.c b/mm/slab_common.c
index 5374150f5486..d6deae9108cd 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -154,6 +154,7 @@ void kmem_cache_destroy(struct kmem_cache *s)
 				rcu_barrier();
 
 			__kmem_cache_destroy(s);
+			kmem_cache_free(kmem_cache, s);
 		} else {
 			list_add(&s->list, &slab_caches);
 			printk(KERN_ERR "kmem_cache_destroy %s: Slab cache still has objects\n",
diff --git a/mm/slob.c b/mm/slob.c
index 7d272c3dcc08..cb4ab9675293 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -540,8 +540,6 @@ struct kmem_cache *__kmem_cache_create(const char *name, size_t size,
 
 void __kmem_cache_destroy(struct kmem_cache *c)
 {
-	kmemleak_free(c);
-	slob_free(c, sizeof(struct kmem_cache));
 }
 
 void *kmem_cache_alloc_node(struct kmem_cache *c, gfp_t flags, int node)
diff --git a/mm/slub.c b/mm/slub.c
index e0d1e0470309..6f932f7a8219 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -213,7 +213,6 @@ static inline int sysfs_slab_alias(struct kmem_cache *s, const char *p)
 static inline void sysfs_slab_remove(struct kmem_cache *s)
 {
 	kfree(s->name);
-	kmem_cache_free(kmem_cache, s);
 }
 
 #endif
@@ -5206,7 +5205,6 @@ static void kmem_cache_release(struct kobject *kobj)
 	struct kmem_cache *s = to_slab(kobj);
 
 	kfree(s->name);
-	kmem_cache_free(kmem_cache, s);
 }
 
 static const struct sysfs_ops slab_sysfs_ops = {
-- 
cgit v1.2.3-55-g7522


From 12c3667fb780e20360ad0bde32dfb3591ef609ad Mon Sep 17 00:00:00 2001
From: Christoph Lameter
Date: Tue, 4 Sep 2012 23:38:33 +0000
Subject: mm/sl[aou]b: Get rid of __kmem_cache_destroy

What is done there can be done in __kmem_cache_shutdown.

This affects RCU handling somewhat. On rcu free all slab allocators do
not refer to other management structures than the kmem_cache structure.
Therefore these other structures can be freed before the rcu deferred
free to the page allocator occurs.

Reviewed-by: Joonsoo Kim <js1304@gmail.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
---
 mm/slab.c        | 46 +++++++++++++++++++++-------------------------
 mm/slab.h        |  1 -
 mm/slab_common.c |  1 -
 mm/slob.c        |  4 ----
 mm/slub.c        | 10 +++++-----
 5 files changed, 26 insertions(+), 36 deletions(-)

(limited to 'mm/slob.c')

diff --git a/mm/slab.c b/mm/slab.c
index 8ca6ec6301fa..de961b48a6a4 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2208,26 +2208,6 @@ static void slab_destroy(struct kmem_cache *cachep, struct slab *slabp)
 	}
 }
 
-void __kmem_cache_destroy(struct kmem_cache *cachep)
-{
-	int i;
-	struct kmem_list3 *l3;
-
-	for_each_online_cpu(i)
-	    kfree(cachep->array[i]);
-
-	/* NUMA: free the list3 structures */
-	for_each_online_node(i) {
-		l3 = cachep->nodelists[i];
-		if (l3) {
-			kfree(l3->shared);
-			free_alien_cache(l3->alien);
-			kfree(l3);
-		}
-	}
-}
-
-
 /**
  * calculate_slab_order - calculate size (page order) of slabs
  * @cachep: pointer to the cache that is being created
@@ -2364,9 +2344,6 @@ static int __init_refok setup_cpu_cache(struct kmem_cache *cachep, gfp_t gfp)
  * Cannot be called within a int, but can be interrupted.
  * The @ctor is run when new pages are allocated by the cache.
  *
- * @name must be valid until the cache is destroyed. This implies that
- * the module calling this has to destroy the cache before getting unloaded.
- *
  * The flags are
  *
  * %SLAB_POISON - Poison the slab with a known test pattern (a5a5a5a5)
@@ -2591,7 +2568,7 @@ __kmem_cache_create (const char *name, size_t size, size_t align,
 	cachep->refcount = 1;
 
 	if (setup_cpu_cache(cachep, gfp)) {
-		__kmem_cache_destroy(cachep);
+		__kmem_cache_shutdown(cachep);
 		return NULL;
 	}
 
@@ -2766,7 +2743,26 @@ EXPORT_SYMBOL(kmem_cache_shrink);
 
 int __kmem_cache_shutdown(struct kmem_cache *cachep)
 {
-	return __cache_shrink(cachep);
+	int i;
+	struct kmem_list3 *l3;
+	int rc = __cache_shrink(cachep);
+
+	if (rc)
+		return rc;
+
+	for_each_online_cpu(i)
+	    kfree(cachep->array[i]);
+
+	/* NUMA: free the list3 structures */
+	for_each_online_node(i) {
+		l3 = cachep->nodelists[i];
+		if (l3) {
+			kfree(l3->shared);
+			free_alien_cache(l3->alien);
+			kfree(l3);
+		}
+	}
+	return 0;
 }
 
 /*
diff --git a/mm/slab.h b/mm/slab.h
index 6724aa6f662f..c4f9a361bd18 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -37,6 +37,5 @@ struct kmem_cache *__kmem_cache_create(const char *name, size_t size,
 	size_t align, unsigned long flags, void (*ctor)(void *));
 
 int __kmem_cache_shutdown(struct kmem_cache *);
-void __kmem_cache_destroy(struct kmem_cache *);
 
 #endif
diff --git a/mm/slab_common.c b/mm/slab_common.c
index d6deae9108cd..7df814e8fbea 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -153,7 +153,6 @@ void kmem_cache_destroy(struct kmem_cache *s)
 			if (s->flags & SLAB_DESTROY_BY_RCU)
 				rcu_barrier();
 
-			__kmem_cache_destroy(s);
 			kmem_cache_free(kmem_cache, s);
 		} else {
 			list_add(&s->list, &slab_caches);
diff --git a/mm/slob.c b/mm/slob.c
index cb4ab9675293..50f605322700 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -538,10 +538,6 @@ struct kmem_cache *__kmem_cache_create(const char *name, size_t size,
 	return c;
 }
 
-void __kmem_cache_destroy(struct kmem_cache *c)
-{
-}
-
 void *kmem_cache_alloc_node(struct kmem_cache *c, gfp_t flags, int node)
 {
 	void *b;
diff --git a/mm/slub.c b/mm/slub.c
index 6f932f7a8219..e5e09873f5ec 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3205,12 +3205,12 @@ static inline int kmem_cache_close(struct kmem_cache *s)
 
 int __kmem_cache_shutdown(struct kmem_cache *s)
 {
-	return kmem_cache_close(s);
-}
+	int rc = kmem_cache_close(s);
 
-void __kmem_cache_destroy(struct kmem_cache *s)
-{
-	sysfs_slab_remove(s);
+	if (!rc)
+		sysfs_slab_remove(s);
+
+	return rc;
 }
 
 /********************************************************************
-- 
cgit v1.2.3-55-g7522


From 278b1bb1313664d4999a7f7d47a8a8d964862d02 Mon Sep 17 00:00:00 2001
From: Christoph Lameter
Date: Wed, 5 Sep 2012 00:20:34 +0000
Subject: mm/sl[aou]b: Move kmem_cache allocations into common code

Shift the allocations to common code. That way the allocation and
freeing of the kmem_cache structures is handled by common code.

Reviewed-by: Glauber Costa <glommer@parallels.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
---
 mm/slab.c        | 34 ++++++++++++++++------------------
 mm/slab.h        |  4 ++--
 mm/slab_common.c | 18 ++++++++++--------
 mm/slob.c        | 42 +++++++++++++++++-------------------------
 mm/slub.c        | 24 +++++++-----------------
 5 files changed, 52 insertions(+), 70 deletions(-)

(limited to 'mm/slob.c')

diff --git a/mm/slab.c b/mm/slab.c
index de961b48a6a4..abc83334e5fb 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1676,7 +1676,8 @@ void __init kmem_cache_init(void)
 	 * bug.
 	 */
 
-	sizes[INDEX_AC].cs_cachep = __kmem_cache_create(names[INDEX_AC].name,
+	sizes[INDEX_AC].cs_cachep = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT);
+	__kmem_cache_create(sizes[INDEX_AC].cs_cachep, names[INDEX_AC].name,
 					sizes[INDEX_AC].cs_size,
 					ARCH_KMALLOC_MINALIGN,
 					ARCH_KMALLOC_FLAGS|SLAB_PANIC,
@@ -1684,8 +1685,8 @@ void __init kmem_cache_init(void)
 
 	list_add(&sizes[INDEX_AC].cs_cachep->list, &slab_caches);
 	if (INDEX_AC != INDEX_L3) {
-		sizes[INDEX_L3].cs_cachep =
-			__kmem_cache_create(names[INDEX_L3].name,
+		sizes[INDEX_L3].cs_cachep = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT);
+		__kmem_cache_create(sizes[INDEX_L3].cs_cachep, names[INDEX_L3].name,
 				sizes[INDEX_L3].cs_size,
 				ARCH_KMALLOC_MINALIGN,
 				ARCH_KMALLOC_FLAGS|SLAB_PANIC,
@@ -1704,7 +1705,8 @@ void __init kmem_cache_init(void)
 		 * allow tighter packing of the smaller caches.
 		 */
 		if (!sizes->cs_cachep) {
-			sizes->cs_cachep = __kmem_cache_create(names->name,
+			sizes->cs_cachep = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT);
+			__kmem_cache_create(sizes->cs_cachep, names->name,
 					sizes->cs_size,
 					ARCH_KMALLOC_MINALIGN,
 					ARCH_KMALLOC_FLAGS|SLAB_PANIC,
@@ -1712,7 +1714,8 @@ void __init kmem_cache_init(void)
 			list_add(&sizes->cs_cachep->list, &slab_caches);
 		}
 #ifdef CONFIG_ZONE_DMA
-		sizes->cs_dmacachep = __kmem_cache_create(
+		sizes->cs_dmacachep = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT);
+		__kmem_cache_create(sizes->cs_dmacachep,
 					names->name_dma,
 					sizes->cs_size,
 					ARCH_KMALLOC_MINALIGN,
@@ -2356,13 +2359,13 @@ static int __init_refok setup_cpu_cache(struct kmem_cache *cachep, gfp_t gfp)
  * cacheline.  This can be beneficial if you're counting cycles as closely
  * as davem.
  */
-struct kmem_cache *
-__kmem_cache_create (const char *name, size_t size, size_t align,
+int
+__kmem_cache_create (struct kmem_cache *cachep, const char *name, size_t size, size_t align,
 	unsigned long flags, void (*ctor)(void *))
 {
 	size_t left_over, slab_size, ralign;
-	struct kmem_cache *cachep = NULL;
 	gfp_t gfp;
+	int err;
 
 #if DEBUG
 #if FORCED_DEBUG
@@ -2450,11 +2453,6 @@ __kmem_cache_create (const char *name, size_t size, size_t align,
 	else
 		gfp = GFP_NOWAIT;
 
-	/* Get cache's description obj. */
-	cachep = kmem_cache_zalloc(kmem_cache, gfp);
-	if (!cachep)
-		return NULL;
-
 	cachep->nodelists = (struct kmem_list3 **)&cachep->array[nr_cpu_ids];
 	cachep->object_size = size;
 	cachep->align = align;
@@ -2509,8 +2507,7 @@ __kmem_cache_create (const char *name, size_t size, size_t align,
 	if (!cachep->num) {
 		printk(KERN_ERR
 		       "kmem_cache_create: couldn't create cache %s.\n", name);
-		kmem_cache_free(kmem_cache, cachep);
-		return NULL;
+		return -E2BIG;
 	}
 	slab_size = ALIGN(cachep->num * sizeof(kmem_bufctl_t)
 			  + sizeof(struct slab), align);
@@ -2567,9 +2564,10 @@ __kmem_cache_create (const char *name, size_t size, size_t align,
 	cachep->name = name;
 	cachep->refcount = 1;
 
-	if (setup_cpu_cache(cachep, gfp)) {
+	err = setup_cpu_cache(cachep, gfp);
+	if (err) {
 		__kmem_cache_shutdown(cachep);
-		return NULL;
+		return err;
 	}
 
 	if (flags & SLAB_DEBUG_OBJECTS) {
@@ -2582,7 +2580,7 @@ __kmem_cache_create (const char *name, size_t size, size_t align,
 		slab_set_debugobj_lock_classes(cachep);
 	}
 
-	return cachep;
+	return 0;
 }
 
 #if DEBUG
diff --git a/mm/slab.h b/mm/slab.h
index ec7b94429b99..077b07a24efe 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -33,8 +33,8 @@ extern struct list_head slab_caches;
 extern struct kmem_cache *kmem_cache;
 
 /* Functions provided by the slab allocators */
-struct kmem_cache *__kmem_cache_create(const char *name, size_t size,
-	size_t align, unsigned long flags, void (*ctor)(void *));
+extern int __kmem_cache_create(struct kmem_cache *, const char *name,
+	size_t size, size_t align, unsigned long flags, void (*ctor)(void *));
 
 #ifdef CONFIG_SLUB
 struct kmem_cache *__kmem_cache_alias(const char *name, size_t size,
diff --git a/mm/slab_common.c b/mm/slab_common.c
index 4f722084baed..f50d2ed4fbf1 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -119,19 +119,21 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size, size_t align
 	if (s)
 		goto out_locked;
 
-	s = __kmem_cache_create(n, size, align, flags, ctor);
-
+	s = kmem_cache_zalloc(kmem_cache, GFP_KERNEL);
 	if (s) {
-		/*
-		 * Check if the slab has actually been created and if it was a
-		 * real instatiation. Aliases do not belong on the list
-		 */
-		if (s->refcount == 1)
+		err = __kmem_cache_create(s, n, size, align, flags, ctor);
+		if (!err)
+
 			list_add(&s->list, &slab_caches);
 
+		else {
+			kfree(n);
+			kmem_cache_free(kmem_cache, s);
+		}
+
 	} else {
 		kfree(n);
-		err = -ENOSYS; /* Until __kmem_cache_create returns code */
+		err = -ENOMEM;
 	}
 
 out_locked:
diff --git a/mm/slob.c b/mm/slob.c
index 50f605322700..9b0cee1e8475 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -508,34 +508,26 @@ size_t ksize(const void *block)
 }
 EXPORT_SYMBOL(ksize);
 
-struct kmem_cache *__kmem_cache_create(const char *name, size_t size,
+int __kmem_cache_create(struct kmem_cache *c, const char *name, size_t size,
 	size_t align, unsigned long flags, void (*ctor)(void *))
 {
-	struct kmem_cache *c;
-
-	c = slob_alloc(sizeof(struct kmem_cache),
-		GFP_KERNEL, ARCH_KMALLOC_MINALIGN, -1);
-
-	if (c) {
-		c->name = name;
-		c->size = size;
-		if (flags & SLAB_DESTROY_BY_RCU) {
-			/* leave room for rcu footer at the end of object */
-			c->size += sizeof(struct slob_rcu);
-		}
-		c->flags = flags;
-		c->ctor = ctor;
-		/* ignore alignment unless it's forced */
-		c->align = (flags & SLAB_HWCACHE_ALIGN) ? SLOB_ALIGN : 0;
-		if (c->align < ARCH_SLAB_MINALIGN)
-			c->align = ARCH_SLAB_MINALIGN;
-		if (c->align < align)
-			c->align = align;
-
-		kmemleak_alloc(c, sizeof(struct kmem_cache), 1, GFP_KERNEL);
-		c->refcount = 1;
+	c->name = name;
+	c->size = size;
+	if (flags & SLAB_DESTROY_BY_RCU) {
+		/* leave room for rcu footer at the end of object */
+		c->size += sizeof(struct slob_rcu);
 	}
-	return c;
+	c->flags = flags;
+	c->ctor = ctor;
+	/* ignore alignment unless it's forced */
+	c->align = (flags & SLAB_HWCACHE_ALIGN) ? SLOB_ALIGN : 0;
+	if (c->align < ARCH_SLAB_MINALIGN)
+		c->align = ARCH_SLAB_MINALIGN;
+	if (c->align < align)
+		c->align = align;
+
+	c->refcount = 1;
+	return 0;
 }
 
 void *kmem_cache_alloc_node(struct kmem_cache *c, gfp_t flags, int node)
diff --git a/mm/slub.c b/mm/slub.c
index 8d00fd78df23..0ad3fffc7d23 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3034,7 +3034,6 @@ static int kmem_cache_open(struct kmem_cache *s,
 		size_t align, unsigned long flags,
 		void (*ctor)(void *))
 {
-	memset(s, 0, kmem_size);
 	s->name = name;
 	s->ctor = ctor;
 	s->object_size = size;
@@ -3109,7 +3108,7 @@ static int kmem_cache_open(struct kmem_cache *s,
 		goto error;
 
 	if (alloc_kmem_cache_cpus(s))
-		return 1;
+		return 0;
 
 	free_kmem_cache_nodes(s);
 error:
@@ -3118,7 +3117,7 @@ error:
 			"order=%u offset=%u flags=%lx\n",
 			s->name, (unsigned long)size, s->size, oo_order(s->oo),
 			s->offset, flags);
-	return 0;
+	return -EINVAL;
 }
 
 /*
@@ -3260,13 +3259,13 @@ static struct kmem_cache *__init create_kmalloc_cache(const char *name,
 {
 	struct kmem_cache *s;
 
-	s = kmem_cache_alloc(kmem_cache, GFP_NOWAIT);
+	s = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT);
 
 	/*
 	 * This function is called with IRQs disabled during early-boot on
 	 * single CPU so there's no need to take slab_mutex here.
 	 */
-	if (!kmem_cache_open(s, name, size, ARCH_KMALLOC_MINALIGN,
+	if (kmem_cache_open(s, name, size, ARCH_KMALLOC_MINALIGN,
 								flags, NULL))
 		goto panic;
 
@@ -3944,20 +3943,11 @@ struct kmem_cache *__kmem_cache_alias(const char *name, size_t size,
 	return s;
 }
 
-struct kmem_cache *__kmem_cache_create(const char *name, size_t size,
+int __kmem_cache_create(struct kmem_cache *s,
+		const char *name, size_t size,
 		size_t align, unsigned long flags, void (*ctor)(void *))
 {
-	struct kmem_cache *s;
-
-	s = kmem_cache_alloc(kmem_cache, GFP_KERNEL);
-	if (s) {
-		if (kmem_cache_open(s, name,
-				size, align, flags, ctor)) {
-			return s;
-		}
-		kmem_cache_free(kmem_cache, s);
-	}
-	return NULL;
+	return kmem_cache_open(s, name, size, align, flags, ctor);
 }
 
 #ifdef CONFIG_SMP
-- 
cgit v1.2.3-55-g7522


From 8a13a4cc80bb25c9eab2e7e56bab724fcfa55fce Mon Sep 17 00:00:00 2001
From: Christoph Lameter
Date: Tue, 4 Sep 2012 23:18:33 +0000
Subject: mm/sl[aou]b: Shrink __kmem_cache_create() parameter lists

Do the initial settings of the fields in common code. This will allow us
to push more processing into common code later and improve readability.

Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
---
 mm/slab.c        | 73 +++++++++++++++++++++++++-------------------------------
 mm/slab.h        |  3 +--
 mm/slab_common.c | 26 ++++++++++----------
 mm/slob.c        |  8 +++----
 mm/slub.c        | 39 ++++++++++++++----------------
 5 files changed, 68 insertions(+), 81 deletions(-)

(limited to 'mm/slob.c')

diff --git a/mm/slab.c b/mm/slab.c
index abc83334e5fb..f1f6d54e129a 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1677,20 +1677,20 @@ void __init kmem_cache_init(void)
 	 */
 
 	sizes[INDEX_AC].cs_cachep = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT);
-	__kmem_cache_create(sizes[INDEX_AC].cs_cachep, names[INDEX_AC].name,
-					sizes[INDEX_AC].cs_size,
-					ARCH_KMALLOC_MINALIGN,
-					ARCH_KMALLOC_FLAGS|SLAB_PANIC,
-					NULL);
-
+	sizes[INDEX_AC].cs_cachep->name = names[INDEX_AC].name;
+	sizes[INDEX_AC].cs_cachep->size = sizes[INDEX_AC].cs_size;
+	sizes[INDEX_AC].cs_cachep->object_size = sizes[INDEX_AC].cs_size;
+	sizes[INDEX_AC].cs_cachep->align = ARCH_KMALLOC_MINALIGN;
+	__kmem_cache_create(sizes[INDEX_AC].cs_cachep, ARCH_KMALLOC_FLAGS|SLAB_PANIC);
 	list_add(&sizes[INDEX_AC].cs_cachep->list, &slab_caches);
+
 	if (INDEX_AC != INDEX_L3) {
 		sizes[INDEX_L3].cs_cachep = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT);
-		__kmem_cache_create(sizes[INDEX_L3].cs_cachep, names[INDEX_L3].name,
-				sizes[INDEX_L3].cs_size,
-				ARCH_KMALLOC_MINALIGN,
-				ARCH_KMALLOC_FLAGS|SLAB_PANIC,
-				NULL);
+		sizes[INDEX_L3].cs_cachep->name = names[INDEX_L3].name;
+		sizes[INDEX_L3].cs_cachep->size = sizes[INDEX_L3].cs_size;
+		sizes[INDEX_L3].cs_cachep->object_size = sizes[INDEX_L3].cs_size;
+		sizes[INDEX_L3].cs_cachep->align = ARCH_KMALLOC_MINALIGN;
+		__kmem_cache_create(sizes[INDEX_L3].cs_cachep, ARCH_KMALLOC_FLAGS|SLAB_PANIC);
 		list_add(&sizes[INDEX_L3].cs_cachep->list, &slab_caches);
 	}
 
@@ -1706,22 +1706,21 @@ void __init kmem_cache_init(void)
 		 */
 		if (!sizes->cs_cachep) {
 			sizes->cs_cachep = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT);
-			__kmem_cache_create(sizes->cs_cachep, names->name,
-					sizes->cs_size,
-					ARCH_KMALLOC_MINALIGN,
-					ARCH_KMALLOC_FLAGS|SLAB_PANIC,
-					NULL);
+			sizes->cs_cachep->name = names->name;
+			sizes->cs_cachep->size = sizes->cs_size;
+			sizes->cs_cachep->object_size = sizes->cs_size;
+			sizes->cs_cachep->align = ARCH_KMALLOC_MINALIGN;
+			__kmem_cache_create(sizes->cs_cachep, ARCH_KMALLOC_FLAGS|SLAB_PANIC);
 			list_add(&sizes->cs_cachep->list, &slab_caches);
 		}
 #ifdef CONFIG_ZONE_DMA
 		sizes->cs_dmacachep = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT);
+		sizes->cs_dmacachep->name = names->name_dma;
+		sizes->cs_dmacachep->size = sizes->cs_size;
+		sizes->cs_dmacachep->object_size = sizes->cs_size;
+		sizes->cs_dmacachep->align = ARCH_KMALLOC_MINALIGN;
 		__kmem_cache_create(sizes->cs_dmacachep,
-					names->name_dma,
-					sizes->cs_size,
-					ARCH_KMALLOC_MINALIGN,
-					ARCH_KMALLOC_FLAGS|SLAB_CACHE_DMA|
-						SLAB_PANIC,
-					NULL);
+			       ARCH_KMALLOC_FLAGS|SLAB_CACHE_DMA| SLAB_PANIC);
 		list_add(&sizes->cs_dmacachep->list, &slab_caches);
 #endif
 		sizes++;
@@ -2360,12 +2359,12 @@ static int __init_refok setup_cpu_cache(struct kmem_cache *cachep, gfp_t gfp)
  * as davem.
  */
 int
-__kmem_cache_create (struct kmem_cache *cachep, const char *name, size_t size, size_t align,
-	unsigned long flags, void (*ctor)(void *))
+__kmem_cache_create (struct kmem_cache *cachep, unsigned long flags)
 {
 	size_t left_over, slab_size, ralign;
 	gfp_t gfp;
 	int err;
+	size_t size = cachep->size;
 
 #if DEBUG
 #if FORCED_DEBUG
@@ -2437,8 +2436,8 @@ __kmem_cache_create (struct kmem_cache *cachep, const char *name, size_t size, s
 		ralign = ARCH_SLAB_MINALIGN;
 	}
 	/* 3) caller mandated alignment */
-	if (ralign < align) {
-		ralign = align;
+	if (ralign < cachep->align) {
+		ralign = cachep->align;
 	}
 	/* disable debug if necessary */
 	if (ralign > __alignof__(unsigned long long))
@@ -2446,7 +2445,7 @@ __kmem_cache_create (struct kmem_cache *cachep, const char *name, size_t size, s
 	/*
 	 * 4) Store it.
 	 */
-	align = ralign;
+	cachep->align = ralign;
 
 	if (slab_is_available())
 		gfp = GFP_KERNEL;
@@ -2454,8 +2453,6 @@ __kmem_cache_create (struct kmem_cache *cachep, const char *name, size_t size, s
 		gfp = GFP_NOWAIT;
 
 	cachep->nodelists = (struct kmem_list3 **)&cachep->array[nr_cpu_ids];
-	cachep->object_size = size;
-	cachep->align = align;
 #if DEBUG
 
 	/*
@@ -2500,17 +2497,15 @@ __kmem_cache_create (struct kmem_cache *cachep, const char *name, size_t size, s
 		 */
 		flags |= CFLGS_OFF_SLAB;
 
-	size = ALIGN(size, align);
+	size = ALIGN(size, cachep->align);
 
-	left_over = calculate_slab_order(cachep, size, align, flags);
+	left_over = calculate_slab_order(cachep, size, cachep->align, flags);
 
-	if (!cachep->num) {
-		printk(KERN_ERR
-		       "kmem_cache_create: couldn't create cache %s.\n", name);
+	if (!cachep->num)
 		return -E2BIG;
-	}
+
 	slab_size = ALIGN(cachep->num * sizeof(kmem_bufctl_t)
-			  + sizeof(struct slab), align);
+			  + sizeof(struct slab), cachep->align);
 
 	/*
 	 * If the slab has been placed off-slab, and we have enough space then
@@ -2538,8 +2533,8 @@ __kmem_cache_create (struct kmem_cache *cachep, const char *name, size_t size, s
 
 	cachep->colour_off = cache_line_size();
 	/* Offset must be a multiple of the alignment. */
-	if (cachep->colour_off < align)
-		cachep->colour_off = align;
+	if (cachep->colour_off < cachep->align)
+		cachep->colour_off = cachep->align;
 	cachep->colour = left_over / cachep->colour_off;
 	cachep->slab_size = slab_size;
 	cachep->flags = flags;
@@ -2560,8 +2555,6 @@ __kmem_cache_create (struct kmem_cache *cachep, const char *name, size_t size, s
 		 */
 		BUG_ON(ZERO_OR_NULL_PTR(cachep->slabp_cache));
 	}
-	cachep->ctor = ctor;
-	cachep->name = name;
 	cachep->refcount = 1;
 
 	err = setup_cpu_cache(cachep, gfp);
diff --git a/mm/slab.h b/mm/slab.h
index 077b07a24efe..67aeaa2d39cc 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -33,8 +33,7 @@ extern struct list_head slab_caches;
 extern struct kmem_cache *kmem_cache;
 
 /* Functions provided by the slab allocators */
-extern int __kmem_cache_create(struct kmem_cache *, const char *name,
-	size_t size, size_t align, unsigned long flags, void (*ctor)(void *));
+extern int __kmem_cache_create(struct kmem_cache *, unsigned long flags);
 
 #ifdef CONFIG_SLUB
 struct kmem_cache *__kmem_cache_alias(const char *name, size_t size,
diff --git a/mm/slab_common.c b/mm/slab_common.c
index f50d2ed4fbf1..8a85a19d90ef 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -100,7 +100,6 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size, size_t align
 {
 	struct kmem_cache *s = NULL;
 	int err = 0;
-	char *n;
 
 	get_online_cpus();
 	mutex_lock(&slab_mutex);
@@ -109,32 +108,33 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size, size_t align
 		goto out_locked;
 
 
-	n = kstrdup(name, GFP_KERNEL);
-	if (!n) {
-		err = -ENOMEM;
-		goto out_locked;
-	}
-
 	s = __kmem_cache_alias(name, size, align, flags, ctor);
 	if (s)
 		goto out_locked;
 
 	s = kmem_cache_zalloc(kmem_cache, GFP_KERNEL);
 	if (s) {
-		err = __kmem_cache_create(s, n, size, align, flags, ctor);
+		s->object_size = s->size = size;
+		s->align = align;
+		s->ctor = ctor;
+		s->name = kstrdup(name, GFP_KERNEL);
+		if (!s->name) {
+			kmem_cache_free(kmem_cache, s);
+			err = -ENOMEM;
+			goto out_locked;
+		}
+
+		err = __kmem_cache_create(s, flags);
 		if (!err)
 
 			list_add(&s->list, &slab_caches);
 
 		else {
-			kfree(n);
+			kfree(s->name);
 			kmem_cache_free(kmem_cache, s);
 		}
-
-	} else {
-		kfree(n);
+	} else
 		err = -ENOMEM;
-	}
 
 out_locked:
 	mutex_unlock(&slab_mutex);
diff --git a/mm/slob.c b/mm/slob.c
index 9b0cee1e8475..cac05d92f329 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -508,17 +508,15 @@ size_t ksize(const void *block)
 }
 EXPORT_SYMBOL(ksize);
 
-int __kmem_cache_create(struct kmem_cache *c, const char *name, size_t size,
-	size_t align, unsigned long flags, void (*ctor)(void *))
+int __kmem_cache_create(struct kmem_cache *c, unsigned long flags)
 {
-	c->name = name;
-	c->size = size;
+	size_t align = c->size;
+
 	if (flags & SLAB_DESTROY_BY_RCU) {
 		/* leave room for rcu footer at the end of object */
 		c->size += sizeof(struct slob_rcu);
 	}
 	c->flags = flags;
-	c->ctor = ctor;
 	/* ignore alignment unless it's forced */
 	c->align = (flags & SLAB_HWCACHE_ALIGN) ? SLOB_ALIGN : 0;
 	if (c->align < ARCH_SLAB_MINALIGN)
diff --git a/mm/slub.c b/mm/slub.c
index 0ad3fffc7d23..d8ee419d5a15 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3029,16 +3029,9 @@ static int calculate_sizes(struct kmem_cache *s, int forced_order)
 
 }
 
-static int kmem_cache_open(struct kmem_cache *s,
-		const char *name, size_t size,
-		size_t align, unsigned long flags,
-		void (*ctor)(void *))
+static int kmem_cache_open(struct kmem_cache *s, unsigned long flags)
 {
-	s->name = name;
-	s->ctor = ctor;
-	s->object_size = size;
-	s->align = align;
-	s->flags = kmem_cache_flags(size, flags, name, ctor);
+	s->flags = kmem_cache_flags(s->size, flags, s->name, s->ctor);
 	s->reserved = 0;
 
 	if (need_reserve_slab_rcu && (s->flags & SLAB_DESTROY_BY_RCU))
@@ -3115,7 +3108,7 @@ error:
 	if (flags & SLAB_PANIC)
 		panic("Cannot create slab %s size=%lu realsize=%u "
 			"order=%u offset=%u flags=%lx\n",
-			s->name, (unsigned long)size, s->size, oo_order(s->oo),
+			s->name, (unsigned long)s->size, s->size, oo_order(s->oo),
 			s->offset, flags);
 	return -EINVAL;
 }
@@ -3261,12 +3254,15 @@ static struct kmem_cache *__init create_kmalloc_cache(const char *name,
 
 	s = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT);
 
+	s->name = name;
+	s->size = s->object_size = size;
+	s->align = ARCH_KMALLOC_MINALIGN;
+
 	/*
 	 * This function is called with IRQs disabled during early-boot on
 	 * single CPU so there's no need to take slab_mutex here.
 	 */
-	if (kmem_cache_open(s, name, size, ARCH_KMALLOC_MINALIGN,
-								flags, NULL))
+	if (kmem_cache_open(s, flags))
 		goto panic;
 
 	list_add(&s->list, &slab_caches);
@@ -3719,9 +3715,10 @@ void __init kmem_cache_init(void)
 	 */
 	kmem_cache_node = (void *)kmem_cache + kmalloc_size;
 
-	kmem_cache_open(kmem_cache_node, "kmem_cache_node",
-		sizeof(struct kmem_cache_node),
-		0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL);
+	kmem_cache_node->name = "kmem_cache_node";
+	kmem_cache_node->size = kmem_cache_node->object_size =
+		sizeof(struct kmem_cache_node);
+	kmem_cache_open(kmem_cache_node, SLAB_HWCACHE_ALIGN | SLAB_PANIC);
 
 	hotplug_memory_notifier(slab_memory_callback, SLAB_CALLBACK_PRI);
 
@@ -3729,8 +3726,10 @@ void __init kmem_cache_init(void)
 	slab_state = PARTIAL;
 
 	temp_kmem_cache = kmem_cache;
-	kmem_cache_open(kmem_cache, "kmem_cache", kmem_size,
-		0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL);
+	kmem_cache->name = "kmem_cache";
+	kmem_cache->size = kmem_cache->object_size = kmem_size;
+	kmem_cache_open(kmem_cache, SLAB_HWCACHE_ALIGN | SLAB_PANIC);
+
 	kmem_cache = kmem_cache_alloc(kmem_cache, GFP_NOWAIT);
 	memcpy(kmem_cache, temp_kmem_cache, kmem_size);
 
@@ -3943,11 +3942,9 @@ struct kmem_cache *__kmem_cache_alias(const char *name, size_t size,
 	return s;
 }
 
-int __kmem_cache_create(struct kmem_cache *s,
-		const char *name, size_t size,
-		size_t align, unsigned long flags, void (*ctor)(void *))
+int __kmem_cache_create(struct kmem_cache *s, unsigned long flags)
 {
-	return kmem_cache_open(s, name, size, align, flags, ctor);
+	return kmem_cache_open(s, flags);
 }
 
 #ifdef CONFIG_SMP
-- 
cgit v1.2.3-55-g7522


From cce89f4f6911286500cf7be0363f46c9b0a12ce0 Mon Sep 17 00:00:00 2001
From: Christoph Lameter
Date: Tue, 4 Sep 2012 23:38:33 +0000
Subject: mm/sl[aou]b: Move kmem_cache refcounting to common code

Get rid of the refcount stuff in the allocators and do that part of
kmem_cache management in the common code.

Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
---
 mm/slab.c        | 1 -
 mm/slab_common.c | 5 +++--
 mm/slob.c        | 1 -
 mm/slub.c        | 1 -
 4 files changed, 3 insertions(+), 5 deletions(-)

(limited to 'mm/slob.c')

diff --git a/mm/slab.c b/mm/slab.c
index f1f6d54e129a..11d9af5f9d2e 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2555,7 +2555,6 @@ __kmem_cache_create (struct kmem_cache *cachep, unsigned long flags)
 		 */
 		BUG_ON(ZERO_OR_NULL_PTR(cachep->slabp_cache));
 	}
-	cachep->refcount = 1;
 
 	err = setup_cpu_cache(cachep, gfp);
 	if (err) {
diff --git a/mm/slab_common.c b/mm/slab_common.c
index 8a85a19d90ef..651a3c60847a 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -125,11 +125,12 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size, size_t align
 		}
 
 		err = __kmem_cache_create(s, flags);
-		if (!err)
+		if (!err) {
 
+			s->refcount = 1;
 			list_add(&s->list, &slab_caches);
 
-		else {
+		} else {
 			kfree(s->name);
 			kmem_cache_free(kmem_cache, s);
 		}
diff --git a/mm/slob.c b/mm/slob.c
index cac05d92f329..3edfeaac3208 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -524,7 +524,6 @@ int __kmem_cache_create(struct kmem_cache *c, unsigned long flags)
 	if (c->align < align)
 		c->align = align;
 
-	c->refcount = 1;
 	return 0;
 }
 
diff --git a/mm/slub.c b/mm/slub.c
index d8ee419d5a15..0b122d8ec216 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3093,7 +3093,6 @@ static int kmem_cache_open(struct kmem_cache *s, unsigned long flags)
 	else
 		s->cpu_partial = 30;
 
-	s->refcount = 1;
 #ifdef CONFIG_NUMA
 	s->remote_node_defrag_ratio = 1000;
 #endif
-- 
cgit v1.2.3-55-g7522