static inline int update_pte_range()

in kernel/tlb.c [217:249]

• 31 lines of code
• 13 McCabe index (conditional complexity)

static inline int update_pte_range(pmd_t *pmd, unsigned long addr,
				   unsigned long end,
				   struct host_vm_change *hvc)
{
	pte_t *pte;
	int r, w, x, prot, ret = 0;

	pte = pte_offset_kernel(pmd, addr);
	do {
		r = pte_read(*pte);
		w = pte_write(*pte);
		x = pte_exec(*pte);
		if (!pte_young(*pte)) {
			r = 0;
			w = 0;
		} else if (!pte_dirty(*pte))
			w = 0;

		prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
			(x ? UM_PROT_EXEC : 0));
		if (hvc->force || pte_newpage(*pte)) {
			if (pte_present(*pte)) {
				if (pte_newpage(*pte))
					ret = add_mmap(addr, pte_val(*pte) & PAGE_MASK,
						       PAGE_SIZE, prot, hvc);
			} else
				ret = add_munmap(addr, PAGE_SIZE, hvc);
		} else if (pte_newprot(*pte))
			ret = add_mprotect(addr, PAGE_SIZE, prot, hvc);
		*pte = pte_mkuptodate(*pte);
	} while (pte++, addr += PAGE_SIZE, ((addr < end) && !ret));
	return ret;
}