From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- net/batman-adv/hash.c | 84 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 84 insertions(+) create mode 100644 net/batman-adv/hash.c (limited to 'net/batman-adv/hash.c') diff --git a/net/batman-adv/hash.c b/net/batman-adv/hash.c new file mode 100644 index 000000000..8016e6197 --- /dev/null +++ b/net/batman-adv/hash.c @@ -0,0 +1,84 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Simon Wunderlich, Marek Lindner + */ + +#include "hash.h" +#include "main.h" + +#include +#include +#include + +/* 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); +} -- cgit v1.2.3