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slab: pass struct kmem_cache_args to do_kmem_cache_create()

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and initialize most things in do_kmem_cache_create(). In a follow-up
patch we'll remove rcu_freeptr_offset from struct kmem_cache.

Reviewed-by: Kees Cook <kees@kernel.org>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Reviewed-by: Roman Gushchin <roman.gushchin@linux.dev>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
This commit is contained in:
Christian Brauner 2024-09-05 09:56:51 +02:00 committed by Vlastimil Babka
parent fc0eac57d0
commit 3dbe2bad57
3 changed files with 25 additions and 23 deletions
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4
mm/slab.h
View File

@ -424,7 +424,9 @@ kmalloc_slab(size_t size, kmem_buckets *b, gfp_t flags, unsigned long caller)
gfp_t kmalloc_fix_flags(gfp_t flags);
/* Functions provided by the slab allocators */
int do_kmem_cache_create(struct kmem_cache *, slab_flags_t flags);
int do_kmem_cache_create(struct kmem_cache *s, const char *name,
unsigned int size, struct kmem_cache_args *args,
slab_flags_t flags);
void __init kmem_cache_init(void);
extern void create_boot_cache(struct kmem_cache *, const char *name,

27
mm/slab_common.c
View File

@ -224,20 +224,7 @@ static struct kmem_cache *create_cache(const char *name,
s = kmem_cache_zalloc(kmem_cache, GFP_KERNEL);
if (!s)
goto out;
s->name = name;
s->size = s->object_size = object_size;
if (args->use_freeptr_offset)
s->rcu_freeptr_offset = args->freeptr_offset;
else
s->rcu_freeptr_offset = UINT_MAX;
s->align = args->align;
s->ctor = args->ctor;
#ifdef CONFIG_HARDENED_USERCOPY
s->useroffset = args->useroffset;
s->usersize = args->usersize;
#endif
err = do_kmem_cache_create(s, flags);
err = do_kmem_cache_create(s, name, object_size, args, flags);
if (err)
goto out_free_cache;
@ -788,9 +775,7 @@ void __init create_boot_cache(struct kmem_cache *s, const char *name,
{
int err;
unsigned int align = ARCH_KMALLOC_MINALIGN;
s->name = name;
s->size = s->object_size = size;
struct kmem_cache_args kmem_args = {};
/*
* kmalloc caches guarantee alignment of at least the largest
@ -799,14 +784,14 @@ void __init create_boot_cache(struct kmem_cache *s, const char *name,
*/
if (flags & SLAB_KMALLOC)
align = max(align, 1U << (ffs(size) - 1));
s->align = calculate_alignment(flags, align, size);
kmem_args.align = calculate_alignment(flags, align, size);
#ifdef CONFIG_HARDENED_USERCOPY
s->useroffset = useroffset;
s->usersize = usersize;
kmem_args.useroffset = useroffset;
kmem_args.usersize = usersize;
#endif
err = do_kmem_cache_create(s, flags);
err = do_kmem_cache_create(s, name, size, &kmem_args, flags);
if (err)
panic("Creation of kmalloc slab %s size=%u failed. Reason %d\n",

17
mm/slub.c
View File

@ -5843,14 +5843,29 @@ __kmem_cache_alias(const char *name, unsigned int size, unsigned int align,
return s;
}
int do_kmem_cache_create(struct kmem_cache *s, slab_flags_t flags)
int do_kmem_cache_create(struct kmem_cache *s, const char *name,
unsigned int size, struct kmem_cache_args *args,
slab_flags_t flags)
{
int err = -EINVAL;
s->name = name;
s->size = s->object_size = size;
s->flags = kmem_cache_flags(flags, s->name);
#ifdef CONFIG_SLAB_FREELIST_HARDENED
s->random = get_random_long();
#endif
if (args->use_freeptr_offset)
s->rcu_freeptr_offset = args->freeptr_offset;
else
s->rcu_freeptr_offset = UINT_MAX;
s->align = args->align;
s->ctor = args->ctor;
#ifdef CONFIG_HARDENED_USERCOPY
s->useroffset = args->useroffset;
s->usersize = args->usersize;
#endif
if (!calculate_sizes(s))
goto out;