123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384 |
- // SPDX-License-Identifier: GPL-2.0
- /* Copyright (C) 2006-2020 B.A.T.M.A.N. contributors:
- *
- * Simon Wunderlich, Marek Lindner
- */
- #include "hash.h"
- #include "main.h"
- #include <linux/gfp.h>
- #include <linux/lockdep.h>
- #include <linux/slab.h>
- /* clears the hash */
- static void batadv_hash_init(struct batadv_hashtable *hash)
- {
- u32 i;
- for (i = 0; i < hash->size; i++) {
- INIT_HLIST_HEAD(&hash->table[i]);
- spin_lock_init(&hash->list_locks[i]);
- }
- atomic_set(&hash->generation, 0);
- }
- /**
- * batadv_hash_destroy() - Free only the hashtable and the hash itself
- * @hash: hash object to destroy
- */
- void batadv_hash_destroy(struct batadv_hashtable *hash)
- {
- kfree(hash->list_locks);
- kfree(hash->table);
- kfree(hash);
- }
- /**
- * batadv_hash_new() - Allocates and clears the hashtable
- * @size: number of hash buckets to allocate
- *
- * Return: newly allocated hashtable, NULL on errors
- */
- struct batadv_hashtable *batadv_hash_new(u32 size)
- {
- struct batadv_hashtable *hash;
- hash = kmalloc(sizeof(*hash), GFP_ATOMIC);
- if (!hash)
- return NULL;
- hash->table = kmalloc_array(size, sizeof(*hash->table), GFP_ATOMIC);
- if (!hash->table)
- goto free_hash;
- hash->list_locks = kmalloc_array(size, sizeof(*hash->list_locks),
- GFP_ATOMIC);
- if (!hash->list_locks)
- goto free_table;
- hash->size = size;
- batadv_hash_init(hash);
- return hash;
- free_table:
- kfree(hash->table);
- free_hash:
- kfree(hash);
- return NULL;
- }
- /**
- * batadv_hash_set_lock_class() - Set specific lockdep class for hash spinlocks
- * @hash: hash object to modify
- * @key: lockdep class key address
- */
- void batadv_hash_set_lock_class(struct batadv_hashtable *hash,
- struct lock_class_key *key)
- {
- u32 i;
- for (i = 0; i < hash->size; i++)
- lockdep_set_class(&hash->list_locks[i], key);
- }
|