static int remap_area_pages()

in mm/ioremap.c [76:112]

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

static int remap_area_pages(unsigned long address, unsigned long phys_addr,
				unsigned long size, unsigned long flags)
{
	int error;
	pgd_t *dir;
	unsigned long end = address + size;

	phys_addr -= address;
	dir = pgd_offset(&init_mm, address);
	flush_cache_all();
	if (address >= end)
		BUG();
	do {
		p4d_t *p4d;
		pud_t *pud;
		pmd_t *pmd;

		error = -ENOMEM;
		p4d = p4d_alloc(&init_mm, dir, address);
		if (!p4d)
			break;
		pud = pud_alloc(&init_mm, p4d, address);
		if (!pud)
			break;
		pmd = pmd_alloc(&init_mm, pud, address);
		if (!pmd)
			break;
		if (remap_area_pmd(pmd, address, end - address,
			phys_addr + address, flags))
			break;
		error = 0;
		address = (address + PGDIR_SIZE) & PGDIR_MASK;
		dir++;
	} while (address && (address < end));
	flush_tlb_all();
	return error;
}