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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455#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);