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mm, slab: move kfence_shutdown_cache() outside slab_mutex

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kfence_shutdown_cache() is called under slab_mutex when the cache is
destroyed synchronously, and outside slab_mutex during the delayed
destruction of SLAB_TYPESAFE_BY_RCU caches.

It seems it should always be safe to call it outside of slab_mutex so we
can just move the call to kmem_cache_release(), which is called outside.

Reviewed-by: Jann Horn <jannh@google.com>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
This commit is contained in:
Vlastimil Babka 2024-08-07 12:31:16 +02:00
parent 4ec10268ed
commit f77d0cda4a
1 changed files with 2 additions and 6 deletions
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8
mm/slab_common.c
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@ -492,6 +492,7 @@ EXPORT_SYMBOL(kmem_buckets_create);
*/
static void kmem_cache_release(struct kmem_cache *s)
{
kfence_shutdown_cache(s);
if (__is_defined(SLAB_SUPPORTS_SYSFS) && slab_state >= FULL)
sysfs_slab_release(s);
else
@ -521,10 +522,8 @@ static void slab_caches_to_rcu_destroy_workfn(struct work_struct *work)
rcu_barrier();
list_for_each_entry_safe(s, s2, &to_destroy, list) {
kfence_shutdown_cache(s);
list_for_each_entry_safe(s, s2, &to_destroy, list)
kmem_cache_release(s);
}
}
void slab_kmem_cache_release(struct kmem_cache *s)
@ -563,9 +562,6 @@ void kmem_cache_destroy(struct kmem_cache *s)
list_del(&s->list);
if (!err && !rcu_set)
kfence_shutdown_cache(s);
mutex_unlock(&slab_mutex);
cpus_read_unlock();