1#include <linux/export.h>
2#include <linux/kernel.h>
3#include <linux/mm.h>
4#include <linux/slab.h>
5#include <linux/vmalloc.h>
6
7/* Allocate an array of spinlocks to be accessed by a hash. Two arguments
8 * indicate the number of elements to allocate in the array. max_size
9 * gives the maximum number of elements to allocate. cpu_mult gives
10 * the number of locks per CPU to allocate. The size is rounded up
11 * to a power of 2 to be suitable as a hash table.
12 */
13
14int __alloc_bucket_spinlocks(spinlock_t **locks, unsigned int *locks_mask,
15			     size_t max_size, unsigned int cpu_mult, gfp_t gfp,
16			     const char *name, struct lock_class_key *key)
17{
18	spinlock_t *tlocks = NULL;
19	unsigned int i, size;
20#if defined(CONFIG_PROVE_LOCKING)
21	unsigned int nr_pcpus = 2;
22#else
23	unsigned int nr_pcpus = num_possible_cpus();
24#endif
25
26	if (cpu_mult) {
27		nr_pcpus = min_t(unsigned int, nr_pcpus, 64UL);
28		size = min_t(unsigned int, nr_pcpus * cpu_mult, max_size);
29	} else {
30		size = max_size;
31	}
32
33	if (sizeof(spinlock_t) != 0) {
34		tlocks = kvmalloc_array(size, sizeof(spinlock_t), gfp);
35		if (!tlocks)
36			return -ENOMEM;
37		for (i = 0; i < size; i++) {
38			spin_lock_init(&tlocks[i]);
39			lockdep_init_map(&tlocks[i].dep_map, name, key, 0);
40		}
41	}
42
43	*locks = tlocks;
44	*locks_mask = size - 1;
45
46	return 0;
47}
48EXPORT_SYMBOL(__alloc_bucket_spinlocks);
49
50void free_bucket_spinlocks(spinlock_t *locks)
51{
52	kvfree(locks);
53}
54EXPORT_SYMBOL(free_bucket_spinlocks);
55