1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) 2006-2019 B.A.T.M.A.N. contributors:
4 * Simon Wunderlich, Marek Lindner
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of version 2 of the GNU General Public
8 * License as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, see <http://www.gnu.org/licenses/>.
22 #include <linux/gfp.h>
23 #include <linux/lockdep.h>
24 #include <linux/slab.h>
27 static void batadv_hash_init(struct batadv_hashtable *hash)
31 for (i = 0; i < hash->size; i++) {
32 INIT_HLIST_HEAD(&hash->table[i]);
33 spin_lock_init(&hash->list_locks[i]);
36 atomic_set(&hash->generation, 0);
40 * batadv_hash_destroy() - Free only the hashtable and the hash itself
41 * @hash: hash object to destroy
43 void batadv_hash_destroy(struct batadv_hashtable *hash)
45 kfree(hash->list_locks);
51 * batadv_hash_new() - Allocates and clears the hashtable
52 * @size: number of hash buckets to allocate
54 * Return: newly allocated hashtable, NULL on errors
56 struct batadv_hashtable *batadv_hash_new(u32 size)
58 struct batadv_hashtable *hash;
60 hash = kmalloc(sizeof(*hash), GFP_ATOMIC);
64 hash->table = kmalloc_array(size, sizeof(*hash->table), GFP_ATOMIC);
68 hash->list_locks = kmalloc_array(size, sizeof(*hash->list_locks),
70 if (!hash->list_locks)
74 batadv_hash_init(hash);
85 * batadv_hash_set_lock_class() - Set specific lockdep class for hash spinlocks
86 * @hash: hash object to modify
87 * @key: lockdep class key address
89 void batadv_hash_set_lock_class(struct batadv_hashtable *hash,
90 struct lock_class_key *key)
94 for (i = 0; i < hash->size; i++)
95 lockdep_set_class(&hash->list_locks[i], key);