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

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KMALLOC_MAX_CACHE_SIZE is 32-bit so is the largest kmalloc cache size.

Christoph said:
:
: Ok SLABs maximum allocation size is limited to 32M (see
: include/linux/slab.h:
:
: #define KMALLOC_SHIFT_HIGH      ((MAX_ORDER + PAGE_SHIFT - 1) <= 25 ? \
:                                 (MAX_ORDER + PAGE_SHIFT - 1) : 25)
:
: And SLUB/SLOB pass all larger requests to the page allocator anyways.

Link: http://lkml.kernel.org/r/20180305200730.15812-4-adobriyan@gmail.com
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Acked-by: 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 16:20:29 -07:00
committed by Linus Torvalds
parent 0be70327ec
commit 55de8b9c60
2 changed files with 7 additions and 7 deletions
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8
mm/slab.h
View File

@@ -77,7 +77,7 @@ extern struct kmem_cache *kmem_cache;
/* A table of kmalloc cache names and sizes */ /* A table of kmalloc cache names and sizes */
extern const struct kmalloc_info_struct { extern const struct kmalloc_info_struct {
const char *name; const char *name;
unsigned long size; unsigned int size;
} kmalloc_info[]; } kmalloc_info[];
#ifndef CONFIG_SLOB #ifndef CONFIG_SLOB
@@ -93,9 +93,9 @@ struct kmem_cache *kmalloc_slab(size_t, gfp_t);
/* Functions provided by the slab allocators */ /* Functions provided by the slab allocators */
int __kmem_cache_create(struct kmem_cache *, slab_flags_t flags); int __kmem_cache_create(struct kmem_cache *, slab_flags_t flags);
extern struct kmem_cache *create_kmalloc_cache(const char *name, size_t size, struct kmem_cache *create_kmalloc_cache(const char *name, unsigned int size,
slab_flags_t flags, size_t useroffset, slab_flags_t flags, unsigned int useroffset,
size_t usersize); unsigned int usersize);
extern void create_boot_cache(struct kmem_cache *, const char *name, extern void create_boot_cache(struct kmem_cache *, const char *name,
size_t size, slab_flags_t flags, size_t useroffset, size_t size, slab_flags_t flags, size_t useroffset,
size_t usersize); size_t usersize);

6
mm/slab_common.c
View File

@@ -939,9 +939,9 @@ void __init create_boot_cache(struct kmem_cache *s, const char *name, size_t siz
s->refcount = -1; /* Exempt from merging for now */ s->refcount = -1; /* Exempt from merging for now */
} }
struct kmem_cache *__init create_kmalloc_cache(const char *name, size_t size, struct kmem_cache *__init create_kmalloc_cache(const char *name,
slab_flags_t flags, size_t useroffset, unsigned int size, slab_flags_t flags,
size_t usersize) unsigned int useroffset, unsigned int usersize)
{ {
struct kmem_cache *s = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT); struct kmem_cache *s = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT);