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lib/bucket_locks.c
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#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. */ |
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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) |
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{ 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) { |
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tlocks = kvmalloc_array(size, sizeof(spinlock_t), gfp); |
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if (!tlocks) return -ENOMEM; |
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for (i = 0; i < size; i++) { |
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spin_lock_init(&tlocks[i]); |
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lockdep_init_map(&tlocks[i].dep_map, name, key, 0); } |
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} *locks = tlocks; *locks_mask = size - 1; return 0; } |
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EXPORT_SYMBOL(__alloc_bucket_spinlocks); |
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void free_bucket_spinlocks(spinlock_t *locks) { kvfree(locks); } EXPORT_SYMBOL(free_bucket_spinlocks); |