void __init paging_init()

in mm/init.c [53:90]

• 20 lines of code
• 2 McCabe index (conditional complexity)

void __init paging_init(void)
{
	/*
	 * Make sure start_mem is page aligned,  otherwise bootmem and
	 * page_alloc get different views og the world.
	 */
	unsigned long start_mem = PAGE_ALIGN(memory_start);
	unsigned long end_mem   = memory_end & PAGE_MASK;

	pr_debug("start_mem is %#lx\nvirtual_end is %#lx\n",
		 start_mem, end_mem);

	/*
	 * Initialize the bad page table and bad page to point
	 * to a couple of allocated pages.
	 */
	empty_zero_page = (unsigned long)memblock_alloc(PAGE_SIZE, PAGE_SIZE);
	if (!empty_zero_page)
		panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
		      __func__, PAGE_SIZE, PAGE_SIZE);

	/*
	 * Set up SFC/DFC registers (user data space).
	 */
	set_fs(USER_DS);

	pr_debug("before free_area_init\n");

	pr_debug("free_area_init -> start_mem is %#lx\nvirtual_end is %#lx\n",
		 start_mem, end_mem);

	{
		unsigned long max_zone_pfn[MAX_NR_ZONES] = {0, };

		max_zone_pfn[ZONE_NORMAL] = end_mem >> PAGE_SHIFT;
		free_area_init(max_zone_pfn);
	}
}