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slab: make kmem_cache_create() work with 32-bit sizes

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struct kmem_cache::size and ::align were always 32-bit.

Out of curiosity I created 4GB kmem_cache, it oopsed with division by 0.
kmem_cache_create(1UL<<32+1) created 1-byte cache as expected.

size_t doesn't work and never did.

Link: http://lkml.kernel.org/r/20180305200730.15812-6-adobriyan@gmail.com
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexey Dobriyan 2018-04-05 16:20:37 -07:00 committed by Linus Torvalds
parent 361d575e5c
commit f4957d5bd0
5 changed files with 19 additions and 17 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

7
include/linux/slab.h
View file

@ -137,11 +137,12 @@ bool slab_is_available(void);
extern bool usercopy_fallback;
struct kmem_cache *kmem_cache_create(const char *name, size_t size,
size_t align, slab_flags_t flags,
struct kmem_cache *kmem_cache_create(const char *name, unsigned int size,
unsigned int align, slab_flags_t flags,
void (*ctor)(void *));
struct kmem_cache *kmem_cache_create_usercopy(const char *name,
size_t size, size_t align, slab_flags_t flags,
unsigned int size, unsigned int align,
slab_flags_t flags,
size_t useroffset, size_t usersize,
void (*ctor)(void *));
void kmem_cache_destroy(struct kmem_cache *);

2
mm/slab.c
View file

@ -1877,7 +1877,7 @@ slab_flags_t kmem_cache_flags(unsigned long object_size,
}
struct kmem_cache *
__kmem_cache_alias(const char *name, size_t size, size_t align,
__kmem_cache_alias(const char *name, unsigned int size, unsigned int align,
slab_flags_t flags, void (*ctor)(void *))
{
struct kmem_cache *cachep;

6
mm/slab.h
View file

@ -101,11 +101,11 @@ extern void create_boot_cache(struct kmem_cache *, const char *name,
unsigned int useroffset, unsigned int usersize);
int slab_unmergeable(struct kmem_cache *s);
struct kmem_cache *find_mergeable(size_t size, size_t align,
struct kmem_cache *find_mergeable(unsigned size, unsigned align,
slab_flags_t flags, const char *name, void (*ctor)(void *));
#ifndef CONFIG_SLOB
struct kmem_cache *
__kmem_cache_alias(const char *name, size_t size, size_t align,
__kmem_cache_alias(const char *name, unsigned int size, unsigned int align,
slab_flags_t flags, void (*ctor)(void *));
slab_flags_t kmem_cache_flags(unsigned long object_size,
@ -113,7 +113,7 @@ slab_flags_t kmem_cache_flags(unsigned long object_size,
void (*ctor)(void *));
#else
static inline struct kmem_cache *
__kmem_cache_alias(const char *name, size_t size, size_t align,
__kmem_cache_alias(const char *name, unsigned int size, unsigned int align,
slab_flags_t flags, void (*ctor)(void *))
{ return NULL; }

19
mm/slab_common.c
View file

@ -82,7 +82,7 @@ unsigned int kmem_cache_size(struct kmem_cache *s)
EXPORT_SYMBOL(kmem_cache_size);
#ifdef CONFIG_DEBUG_VM
static int kmem_cache_sanity_check(const char *name, size_t size)
static int kmem_cache_sanity_check(const char *name, unsigned int size)
{
struct kmem_cache *s = NULL;
@ -113,7 +113,7 @@ static int kmem_cache_sanity_check(const char *name, size_t size)
return 0;
}
#else
static inline int kmem_cache_sanity_check(const char *name, size_t size)
static inline int kmem_cache_sanity_check(const char *name, unsigned int size)
{
return 0;
}
@ -280,8 +280,8 @@ static inline void memcg_unlink_cache(struct kmem_cache *s)
* Figure out what the alignment of the objects will be given a set of
* flags, a user specified alignment and the size of the objects.
*/
static unsigned long calculate_alignment(slab_flags_t flags,
unsigned long align, unsigned long size)
static unsigned int calculate_alignment(slab_flags_t flags,
unsigned int align, unsigned int size)
{
/*
* If the user wants hardware cache aligned objects then follow that
@ -291,7 +291,7 @@ static unsigned long calculate_alignment(slab_flags_t flags,
* alignment though. If that is greater then use it.
*/
if (flags & SLAB_HWCACHE_ALIGN) {
unsigned long ralign;
unsigned int ralign;
ralign = cache_line_size();
while (size <= ralign / 2)
@ -331,7 +331,7 @@ int slab_unmergeable(struct kmem_cache *s)
return 0;
}
struct kmem_cache *find_mergeable(size_t size, size_t align,
struct kmem_cache *find_mergeable(unsigned int size, unsigned int align,
slab_flags_t flags, const char *name, void (*ctor)(void *))
{
struct kmem_cache *s;
@ -379,7 +379,7 @@ struct kmem_cache *find_mergeable(size_t size, size_t align,
}
static struct kmem_cache *create_cache(const char *name,
size_t object_size, size_t size, size_t align,
unsigned int object_size, unsigned int size, unsigned int align,
slab_flags_t flags, size_t useroffset,
size_t usersize, void (*ctor)(void *),
struct mem_cgroup *memcg, struct kmem_cache *root_cache)
@ -452,7 +452,8 @@ static struct kmem_cache *create_cache(const char *name,
* as davem.
*/
struct kmem_cache *
kmem_cache_create_usercopy(const char *name, size_t size, size_t align,
kmem_cache_create_usercopy(const char *name,
unsigned int size, unsigned int align,
slab_flags_t flags, size_t useroffset, size_t usersize,
void (*ctor)(void *))
{
@ -532,7 +533,7 @@ kmem_cache_create_usercopy(const char *name, size_t size, size_t align,
EXPORT_SYMBOL(kmem_cache_create_usercopy);
struct kmem_cache *
kmem_cache_create(const char *name, size_t size, size_t align,
kmem_cache_create(const char *name, unsigned int size, unsigned int align,
slab_flags_t flags, void (*ctor)(void *))
{
return kmem_cache_create_usercopy(name, size, align, flags, 0, 0,

2
mm/slub.c
View file

@ -4242,7 +4242,7 @@ void __init kmem_cache_init_late(void)
}
struct kmem_cache *
__kmem_cache_alias(const char *name, size_t size, size_t align,
__kmem_cache_alias(const char *name, unsigned int size, unsigned int align,
slab_flags_t flags, void (*ctor)(void *))
{
struct kmem_cache *s, *c;