noinline static int handle_kernel_vaddr_fault()

in mm/fault.c [25:70]

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

noinline static int handle_kernel_vaddr_fault(unsigned long address)
{
	/*
	 * Synchronize this task's top level page-table
	 * with the 'reference' page table.
	 */
	pgd_t *pgd, *pgd_k;
	p4d_t *p4d, *p4d_k;
	pud_t *pud, *pud_k;
	pmd_t *pmd, *pmd_k;

	pgd = pgd_offset(current->active_mm, address);
	pgd_k = pgd_offset_k(address);

	if (pgd_none (*pgd_k))
		goto bad_area;
	if (!pgd_present(*pgd))
		set_pgd(pgd, *pgd_k);

	p4d = p4d_offset(pgd, address);
	p4d_k = p4d_offset(pgd_k, address);
	if (p4d_none(*p4d_k))
		goto bad_area;
	if (!p4d_present(*p4d))
		set_p4d(p4d, *p4d_k);

	pud = pud_offset(p4d, address);
	pud_k = pud_offset(p4d_k, address);
	if (pud_none(*pud_k))
		goto bad_area;
	if (!pud_present(*pud))
		set_pud(pud, *pud_k);

	pmd = pmd_offset(pud, address);
	pmd_k = pmd_offset(pud_k, address);
	if (pmd_none(*pmd_k))
		goto bad_area;
	if (!pmd_present(*pmd))
		set_pmd(pmd, *pmd_k);

	/* XXX: create the TLB entry here */
	return 0;

bad_area:
	return 1;
}