static int __init __reserved_mem_reserve_reg()

in fdt.c [501:545]

• 39 lines of code
• 9 McCabe index (conditional complexity)

static int __init __reserved_mem_reserve_reg(unsigned long node,
					     const char *uname)
{
	int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32);
	phys_addr_t base, size;
	int len;
	const __be32 *prop;
	int first = 1;
	bool nomap;

	prop = of_get_flat_dt_prop(node, "reg", &len);
	if (!prop)
		return -ENOENT;

	if (len && len % t_len != 0) {
		pr_err("Reserved memory: invalid reg property in '%s', skipping node.\n",
		       uname);
		return -EINVAL;
	}

	nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL;

	while (len >= t_len) {
		base = dt_mem_next_cell(dt_root_addr_cells, &prop);
		size = dt_mem_next_cell(dt_root_size_cells, &prop);

		if (size &&
		    early_init_dt_reserve_memory_arch(base, size, nomap) == 0) {
			pr_debug("Reserved memory: reserved region for node '%s': base %pa, size %lu MiB\n",
				uname, &base, (unsigned long)(size / SZ_1M));
			if (!nomap)
				kmemleak_alloc_phys(base, size, 0, 0);
		}
		else
			pr_info("Reserved memory: failed to reserve memory for node '%s': base %pa, size %lu MiB\n",
				uname, &base, (unsigned long)(size / SZ_1M));

		len -= t_len;
		if (first) {
			fdt_reserved_mem_save_node(node, uname, base, size);
			first = 0;
		}
	}
	return 0;
}