[PATCH] LIB: add gen_pool_destroy()
Modules using the genpool allocator need to be able to destroy the data structure when unloading. Signed-off-by: Steve Wise <swise@opengridcomputing.com> Cc: Randy Dunlap <rdunlap@xenotime.net> Cc: Dean Nelson <dcn@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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2 changed files with 31 additions and 0 deletions
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@ -31,5 +31,6 @@ struct gen_pool_chunk {
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extern struct gen_pool *gen_pool_create(int, int);
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extern int gen_pool_add(struct gen_pool *, unsigned long, size_t, int);
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extern void gen_pool_destroy(struct gen_pool *);
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extern unsigned long gen_pool_alloc(struct gen_pool *, size_t);
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extern void gen_pool_free(struct gen_pool *, unsigned long, size_t);
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@ -70,6 +70,36 @@ int gen_pool_add(struct gen_pool *pool, unsigned long addr, size_t size,
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EXPORT_SYMBOL(gen_pool_add);
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/*
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* Destroy a memory pool. Verifies that there are no outstanding allocations.
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*
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* @pool: pool to destroy
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*/
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void gen_pool_destroy(struct gen_pool *pool)
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{
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struct list_head *_chunk, *_next_chunk;
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struct gen_pool_chunk *chunk;
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int order = pool->min_alloc_order;
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int bit, end_bit;
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write_lock(&pool->lock);
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list_for_each_safe(_chunk, _next_chunk, &pool->chunks) {
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chunk = list_entry(_chunk, struct gen_pool_chunk, next_chunk);
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list_del(&chunk->next_chunk);
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end_bit = (chunk->end_addr - chunk->start_addr) >> order;
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bit = find_next_bit(chunk->bits, end_bit, 0);
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BUG_ON(bit < end_bit);
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kfree(chunk);
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}
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kfree(pool);
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return;
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}
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EXPORT_SYMBOL(gen_pool_destroy);
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/*
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* Allocate the requested number of bytes from the specified pool.
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* Uses a first-fit algorithm.
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