#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,			     const char *name, struct lock_class_key *key){	spinlock_t *tlocks = NULL;	unsigned int i, size;#if defined(CONFIG_PROVE_LOCKING)	unsigned int nr_pcpus = 2;#else	unsigned int nr_pcpus = num_possible_cpus();#endif 	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) {		tlocks = kvmalloc_objs(spinlock_t, size, gfp);		if (!tlocks)			return -ENOMEM;		for (i = 0; i < size; i++) {			spin_lock_init(&tlocks[i]);			lockdep_init_map(&tlocks[i].dep_map, name, key, 0);		}	} 	*locks = tlocks;	*locks_mask = size - 1; 	return 0;}EXPORT_SYMBOL(__alloc_bucket_spinlocks); void free_bucket_spinlocks(spinlock_t *locks){	kvfree(locks);}EXPORT_SYMBOL(free_bucket_spinlocks);