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Date: Mon, 2 Dec 2013 19:41:15 +0000
From: Christoph Lameter <cl@...ux.com>
To: Greg KH <greg@...ah.com>
cc: Thomas Gleixner <tglx@...utronix.de>,
Russell King - ARM Linux <linux@....linux.org.uk>,
Pablo Neira Ayuso <pablo@...filter.org>,
Sasha Levin <sasha.levin@...cle.com>,
Patrick McHardy <kaber@...sh.net>, kadlec@...ckhole.kfki.hu,
"David S. Miller" <davem@...emloft.net>,
netfilter-devel@...r.kernel.org, coreteam@...filter.org,
netdev@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: netfilter: active obj WARN when cleaning up
On Mon, 2 Dec 2013, Greg KH wrote:
> No, the release callback is in the kobj_type, not the kobject itself.
Ahh... Ok. Patch follows:
Subject: slub: use sysfs'es release mechanism for kmem_cache
Sysfs has a release mechanism. Use that to release the
kmem_cache structure if CONFIG_SYSFS is enabled.
Signed-off-by: Christoph Lameter <cl@...ux.com>
Index: linux/include/linux/slub_def.h
===================================================================
--- linux.orig/include/linux/slub_def.h 2013-12-02 13:31:07.395905824 -0600
+++ linux/include/linux/slub_def.h 2013-12-02 13:31:07.385906101 -0600
@@ -98,4 +98,8 @@ struct kmem_cache {
struct kmem_cache_node *node[MAX_NUMNODES];
};
+#ifdef CONFIG_SYSFS
+#define SLAB_SUPPORTS_SYSFS
+#endif
+
#endif /* _LINUX_SLUB_DEF_H */
Index: linux/mm/slab.h
===================================================================
--- linux.orig/mm/slab.h 2013-12-02 13:31:07.395905824 -0600
+++ linux/mm/slab.h 2013-12-02 13:39:46.671476284 -0600
@@ -57,6 +57,7 @@ struct mem_cgroup;
struct kmem_cache *
__kmem_cache_alias(struct mem_cgroup *memcg, const char *name, size_t size,
size_t align, unsigned long flags, void (*ctor)(void *));
+void sysfs_slab_remove(struct kmem_cache *);
#else
static inline struct kmem_cache *
__kmem_cache_alias(struct mem_cgroup *memcg, const char *name, size_t size,
@@ -91,6 +92,7 @@ __kmem_cache_alias(struct mem_cgroup *me
#define CACHE_CREATE_MASK (SLAB_CORE_FLAGS | SLAB_DEBUG_FLAGS | SLAB_CACHE_FLAGS)
int __kmem_cache_shutdown(struct kmem_cache *);
+void slab_kmem_cache_release(struct kmem_cache *);
struct seq_file;
struct file;
Index: linux/mm/slab_common.c
===================================================================
--- linux.orig/mm/slab_common.c 2013-12-02 13:31:07.395905824 -0600
+++ linux/mm/slab_common.c 2013-12-02 13:33:57.221186749 -0600
@@ -251,6 +251,12 @@ kmem_cache_create(const char *name, size
}
EXPORT_SYMBOL(kmem_cache_create);
+void slab_kmem_cache_release(struct kmem_cache *s)
+{
+ kfree(s->name);
+ kmem_cache_free(kmem_cache, s);
+}
+
void kmem_cache_destroy(struct kmem_cache *s)
{
/* Destroy all the children caches if we aren't a memcg cache */
@@ -268,8 +274,12 @@ void kmem_cache_destroy(struct kmem_cach
rcu_barrier();
memcg_release_cache(s);
- kfree(s->name);
- kmem_cache_free(kmem_cache, s);
+#ifdef SLAB_SUPPORTS_SYSFS
+ sysfs_slab_remove(s);
+#else
+ slab_kmem_cache_release();
+
+#endif
} else {
list_add(&s->list, &slab_caches);
mutex_unlock(&slab_mutex);
Index: linux/mm/slub.c
===================================================================
--- linux.orig/mm/slub.c 2013-12-02 13:31:07.395905824 -0600
+++ linux/mm/slub.c 2013-12-02 13:35:44.208213810 -0600
@@ -210,7 +210,6 @@ enum track_item { TRACK_ALLOC, TRACK_FRE
#ifdef CONFIG_SYSFS
static int sysfs_slab_add(struct kmem_cache *);
static int sysfs_slab_alias(struct kmem_cache *, const char *);
-static void sysfs_slab_remove(struct kmem_cache *);
static void memcg_propagate_slab_attrs(struct kmem_cache *s);
#else
static inline int sysfs_slab_add(struct kmem_cache *s) { return 0; }
@@ -3208,23 +3207,7 @@ static inline int kmem_cache_close(struc
int __kmem_cache_shutdown(struct kmem_cache *s)
{
- int rc = kmem_cache_close(s);
-
- if (!rc) {
- /*
- * We do the same lock strategy around sysfs_slab_add, see
- * __kmem_cache_create. Because this is pretty much the last
- * operation we do and the lock will be released shortly after
- * that in slab_common.c, we could just move sysfs_slab_remove
- * to a later point in common code. We should do that when we
- * have a common sysfs framework for all allocators.
- */
- mutex_unlock(&slab_mutex);
- sysfs_slab_remove(s);
- mutex_lock(&slab_mutex);
- }
-
- return rc;
+ return kmem_cache_close(s);
}
/********************************************************************
@@ -5073,6 +5056,11 @@ static void memcg_propagate_slab_attrs(s
#endif
}
+static void kmem_cache_release(struct kobject *k)
+{
+ slab_kmem_cache_release(to_slab(k));
+}
+
static const struct sysfs_ops slab_sysfs_ops = {
.show = slab_attr_show,
.store = slab_attr_store,
@@ -5080,6 +5068,7 @@ static const struct sysfs_ops slab_sysfs
static struct kobj_type slab_ktype = {
.sysfs_ops = &slab_sysfs_ops,
+ .release = kmem_cache_release,
};
static int uevent_filter(struct kset *kset, struct kobject *kobj)
@@ -5184,7 +5173,7 @@ static int sysfs_slab_add(struct kmem_ca
return 0;
}
-static void sysfs_slab_remove(struct kmem_cache *s)
+void sysfs_slab_remove(struct kmem_cache *s)
{
if (slab_state < FULL)
/*
--
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