diff options
Diffstat (limited to 'lib/genalloc.c')
| -rw-r--r-- | lib/genalloc.c | 63 |
1 files changed, 48 insertions, 15 deletions
diff --git a/lib/genalloc.c b/lib/genalloc.c index 71338b48e8891..75ae68ce03e10 100644 --- a/lib/genalloc.c +++ b/lib/genalloc.c @@ -14,11 +14,13 @@ #include <linux/genalloc.h> -/* - * Create a new special memory pool. - * +/** + * gen_pool_create - create a new special memory pool * @min_alloc_order: log base 2 of number of bytes each bitmap bit represents * @nid: node id of the node the pool structure should be allocated on, or -1 + * + * Create a new special memory pool that can be used to manage special purpose + * memory not managed by the regular kmalloc/kfree interface. */ struct gen_pool *gen_pool_create(int min_alloc_order, int nid) { @@ -34,15 +36,15 @@ struct gen_pool *gen_pool_create(int min_alloc_order, int nid) } EXPORT_SYMBOL(gen_pool_create); - -/* - * Add a new chunk of memory to the specified pool. - * +/** + * gen_pool_add - add a new chunk of special memory to the pool * @pool: pool to add new memory chunk to * @addr: starting address of memory chunk to add to pool * @size: size in bytes of the memory chunk to add to pool * @nid: node id of the node the chunk structure and bitmap should be * allocated on, or -1 + * + * Add a new chunk of special memory to the specified pool. */ int gen_pool_add(struct gen_pool *pool, unsigned long addr, size_t size, int nid) @@ -69,13 +71,44 @@ int gen_pool_add(struct gen_pool *pool, unsigned long addr, size_t size, } EXPORT_SYMBOL(gen_pool_add); - -/* - * Allocate the requested number of bytes from the specified pool. - * Uses a first-fit algorithm. +/** + * gen_pool_destroy - destroy a special memory pool + * @pool: pool to destroy * + * Destroy the specified special memory pool. Verifies that there are no + * outstanding allocations. + */ +void gen_pool_destroy(struct gen_pool *pool) +{ + struct list_head *_chunk, *_next_chunk; + struct gen_pool_chunk *chunk; + int order = pool->min_alloc_order; + int bit, end_bit; + + + write_lock(&pool->lock); + list_for_each_safe(_chunk, _next_chunk, &pool->chunks) { + chunk = list_entry(_chunk, struct gen_pool_chunk, next_chunk); + list_del(&chunk->next_chunk); + + end_bit = (chunk->end_addr - chunk->start_addr) >> order; + bit = find_next_bit(chunk->bits, end_bit, 0); + BUG_ON(bit < end_bit); + + kfree(chunk); + } + kfree(pool); + return; +} +EXPORT_SYMBOL(gen_pool_destroy); + +/** + * gen_pool_alloc - allocate special memory from the pool * @pool: pool to allocate from * @size: number of bytes to allocate from the pool + * + * Allocate the requested number of bytes from the specified pool. + * Uses a first-fit algorithm. */ unsigned long gen_pool_alloc(struct gen_pool *pool, size_t size) { @@ -127,13 +160,13 @@ unsigned long gen_pool_alloc(struct gen_pool *pool, size_t size) } EXPORT_SYMBOL(gen_pool_alloc); - -/* - * Free the specified memory back to the specified pool. - * +/** + * gen_pool_free - free allocated special memory back to the pool * @pool: pool to free to * @addr: starting address of memory to free back to pool * @size: size in bytes of memory to free + * + * Free previously allocated special memory back to the specified pool. */ void gen_pool_free(struct gen_pool *pool, unsigned long addr, size_t size) { |