unsigned long uncached_alloc_page()

in kernel/uncached.c [177:206]

• 25 lines of code
• 8 McCabe index (conditional complexity)

unsigned long uncached_alloc_page(int starting_nid, int n_pages)
{
	unsigned long uc_addr;
	struct uncached_pool *uc_pool;
	int nid;

	if (unlikely(starting_nid >= MAX_NUMNODES))
		return 0;

	if (starting_nid < 0)
		starting_nid = numa_node_id();
	nid = starting_nid;

	do {
		if (!node_state(nid, N_HIGH_MEMORY))
			continue;
		uc_pool = &uncached_pools[nid];
		if (uc_pool->pool == NULL)
			continue;
		do {
			uc_addr = gen_pool_alloc(uc_pool->pool,
						 n_pages * PAGE_SIZE);
			if (uc_addr != 0)
				return uc_addr;
		} while (uncached_add_chunk(uc_pool, nid) == 0);

	} while ((nid = (nid + 1) % MAX_NUMNODES) != starting_nid);

	return 0;
}