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Diffstat (limited to 'mm/slub.c')
-rw-r--r--mm/slub.c45
1 files changed, 14 insertions, 31 deletions
diff --git a/mm/slub.c b/mm/slub.c
index 5e3e8bc9838f..022c1b4d74d4 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -891,13 +891,13 @@ static void kmem_cache_open_debug_check(struct kmem_cache *s)
* On 32 bit platforms the limit is 256k. On 64bit platforms
* the limit is 512k.
*
- * Debugging or ctor/dtors may create a need to move the free
+ * Debugging or ctor may create a need to move the free
* pointer. Fail if this happens.
*/
if (s->size >= 65535 * sizeof(void *)) {
BUG_ON(s->flags & (SLAB_RED_ZONE | SLAB_POISON |
SLAB_STORE_USER | SLAB_DESTROY_BY_RCU));
- BUG_ON(s->ctor || s->dtor);
+ BUG_ON(s->ctor);
}
else
/*
@@ -1030,15 +1030,12 @@ static void __free_slab(struct kmem_cache *s, struct page *page)
{
int pages = 1 << s->order;
- if (unlikely(SlabDebug(page) || s->dtor)) {
+ if (unlikely(SlabDebug(page))) {
void *p;
slab_pad_check(s, page);
- for_each_object(p, s, page_address(page)) {
- if (s->dtor)
- s->dtor(p, s, 0);
+ for_each_object(p, s, page_address(page))
check_object(s, page, p, 0);
- }
}
mod_zone_page_state(page_zone(page),
@@ -1871,7 +1868,7 @@ static int calculate_sizes(struct kmem_cache *s)
* then we should never poison the object itself.
*/
if ((flags & SLAB_POISON) && !(flags & SLAB_DESTROY_BY_RCU) &&
- !s->ctor && !s->dtor)
+ !s->ctor)
s->flags |= __OBJECT_POISON;
else
s->flags &= ~__OBJECT_POISON;
@@ -1901,7 +1898,7 @@ static int calculate_sizes(struct kmem_cache *s)
#ifdef CONFIG_SLUB_DEBUG
if (((flags & (SLAB_DESTROY_BY_RCU | SLAB_POISON)) ||
- s->ctor || s->dtor)) {
+ s->ctor)) {
/*
* Relocate free pointer after the object if it is not
* permitted to overwrite the first word of the object on
@@ -1970,13 +1967,11 @@ static int calculate_sizes(struct kmem_cache *s)
static int kmem_cache_open(struct kmem_cache *s, gfp_t gfpflags,
const char *name, size_t size,
size_t align, unsigned long flags,
- void (*ctor)(void *, struct kmem_cache *, unsigned long),
- void (*dtor)(void *, struct kmem_cache *, unsigned long))
+ void (*ctor)(void *, struct kmem_cache *, unsigned long))
{
memset(s, 0, kmem_size);
s->name = name;
s->ctor = ctor;
- s->dtor = dtor;
s->objsize = size;
s->flags = flags;
s->align = align;
@@ -2161,7 +2156,7 @@ static struct kmem_cache *create_kmalloc_cache(struct kmem_cache *s,
down_write(&slub_lock);
if (!kmem_cache_open(s, gfp_flags, name, size, ARCH_KMALLOC_MINALIGN,
- flags, NULL, NULL))
+ flags, NULL))
goto panic;
list_add(&s->list, &slab_caches);
@@ -2463,7 +2458,7 @@ static int slab_unmergeable(struct kmem_cache *s)
if (slub_nomerge || (s->flags & SLUB_NEVER_MERGE))
return 1;
- if (s->ctor || s->dtor)
+ if (s->ctor)
return 1;
return 0;
@@ -2471,15 +2466,14 @@ static int slab_unmergeable(struct kmem_cache *s)
static struct kmem_cache *find_mergeable(size_t size,
size_t align, unsigned long flags,
- void (*ctor)(void *, struct kmem_cache *, unsigned long),
- void (*dtor)(void *, struct kmem_cache *, unsigned long))
+ void (*ctor)(void *, struct kmem_cache *, unsigned long))
{
struct list_head *h;
if (slub_nomerge || (flags & SLUB_NEVER_MERGE))
return NULL;
- if (ctor || dtor)
+ if (ctor)
return NULL;
size = ALIGN(size, sizeof(void *));
@@ -2521,8 +2515,9 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size,
{
struct kmem_cache *s;
+ BUG_ON(dtor);
down_write(&slub_lock);
- s = find_mergeable(size, align, flags, ctor, dtor);
+ s = find_mergeable(size, align, flags, ctor);
if (s) {
s->refcount++;
/*
@@ -2536,7 +2531,7 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size,
} else {
s = kmalloc(kmem_size, GFP_KERNEL);
if (s && kmem_cache_open(s, GFP_KERNEL, name,
- size, align, flags, ctor, dtor)) {
+ size, align, flags, ctor)) {
if (sysfs_slab_add(s)) {
kfree(s);
goto err;
@@ -3177,17 +3172,6 @@ static ssize_t ctor_show(struct kmem_cache *s, char *buf)
}
SLAB_ATTR_RO(ctor);
-static ssize_t dtor_show(struct kmem_cache *s, char *buf)
-{
- if (s->dtor) {
- int n = sprint_symbol(buf, (unsigned long)s->dtor);
-
- return n + sprintf(buf + n, "\n");
- }
- return 0;
-}
-SLAB_ATTR_RO(dtor);
-
static ssize_t aliases_show(struct kmem_cache *s, char *buf)
{
return sprintf(buf, "%d\n", s->refcount - 1);
@@ -3419,7 +3403,6 @@ static struct attribute * slab_attrs[] = {
&partial_attr.attr,
&cpu_slabs_attr.attr,
&ctor_attr.attr,
- &dtor_attr.attr,
&aliases_attr.attr,
&align_attr.attr,
&sanity_checks_attr.attr,