void __init init_dma_coherent_pool_size(unsigned long size)
{
	/*
	 * Catch any attempt to set the pool size too late.
	 */
	BUG_ON(atomic_pool.vaddr);

	/*
	 * Set architecture specific coherent pool size only if
	 * it has not been changed by kernel command line parameter.
	 */
	if (atomic_pool.size == DEFAULT_DMA_COHERENT_POOL_SIZE)
		atomic_pool.size = size;
}
void __init init_dma_coherent_pool_size(unsigned long size)
{
	 
	BUG_ON(atomic_pool.vaddr);

	 
	if (atomic_pool.size == DEFAULT_DMA_COHERENT_POOL_SIZE)
		atomic_pool.size = size;
}