btree_free         56 include/linux/btree.h void btree_free(void *element, void *pool_data);
btree_free         91 lib/btree.c    EXPORT_SYMBOL_GPL(btree_free);
btree_free        192 lib/btree.c    	head->mempool = mempool_create(0, btree_alloc, btree_free, NULL);