lib/genalloc.c: add genpool range check function

		int min_alloc_order, int nid);

extern struct gen_pool *dev_get_gen_pool(struct device *dev);

bool addr_in_gen_pool(struct gen_pool *pool, unsigned long start,

			size_t size);

#ifdef CONFIG_OF

extern struct gen_pool *of_get_named_gen_pool(struct device_node *np,

	const char *propname, int index);

}

EXPORT_SYMBOL(gen_pool_for_each_chunk);

/**

 * addr_in_gen_pool - checks if an address falls within the range of a pool

 * @pool:	the generic memory pool

 * @start:	start address

 * @size:	size of the region

 *

 * Check if the range of addresses falls within the specified pool. Returns

 * true if the entire range is contained in the pool and false otherwise.

 */

bool addr_in_gen_pool(struct gen_pool *pool, unsigned long start,

			size_t size)

{

	bool found = false;

	unsigned long end = start + size;

	struct gen_pool_chunk *chunk;

	rcu_read_lock();

	list_for_each_entry_rcu(chunk, &(pool)->chunks, next_chunk) {

		if (start >= chunk->start_addr && start <= chunk->end_addr) {

			if (end <= chunk->end_addr) {

				found = true;

				break;

			}

		}

	}

	rcu_read_unlock();

	return found;

}

/**

 * gen_pool_avail - get available free space of the pool

 * @pool: pool to get available free space