blob: a9d4e176f4deefc7ecb734f73a3f4c3c810aecd4 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
|
// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2006-2019 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);
}
|
