blob: 266a97c5708ba3ad6f35e94ff4c952c1450a2a15 [file] [log] [blame]
#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
/* Allocate an array of spinlocks to be accessed by a hash. Two arguments
* indicate the number of elements to allocate in the array. max_size
* gives the maximum number of elements to allocate. cpu_mult gives
* the number of locks per CPU to allocate. The size is rounded up
* to a power of 2 to be suitable as a hash table.
int alloc_bucket_spinlocks(spinlock_t **locks, unsigned int *locks_mask,
size_t max_size, unsigned int cpu_mult, gfp_t gfp)
spinlock_t *tlocks = NULL;
unsigned int i, size;
unsigned int nr_pcpus = 2;
unsigned int nr_pcpus = num_possible_cpus();
if (cpu_mult) {
nr_pcpus = min_t(unsigned int, nr_pcpus, 64UL);
size = min_t(unsigned int, nr_pcpus * cpu_mult, max_size);
} else {
size = max_size;
if (sizeof(spinlock_t) != 0) {
if (gfpflags_allow_blocking(gfp))
tlocks = kvmalloc(size * sizeof(spinlock_t), gfp);
tlocks = kmalloc_array(size, sizeof(spinlock_t), gfp);
if (!tlocks)
return -ENOMEM;
for (i = 0; i < size; i++)
*locks = tlocks;
*locks_mask = size - 1;
return 0;
void free_bucket_spinlocks(spinlock_t *locks)