static void __init populate()

in mm/kasan_init.c [37:73]

• 29 lines of code
• 6 McCabe index (conditional complexity)

static void __init populate(void *start, void *end)
{
	unsigned long n_pages = (end - start) / PAGE_SIZE;
	unsigned long n_pmds = n_pages / PTRS_PER_PTE;
	unsigned long i, j;
	unsigned long vaddr = (unsigned long)start;
	pmd_t *pmd = pmd_off_k(vaddr);
	pte_t *pte = memblock_alloc(n_pages * sizeof(pte_t), PAGE_SIZE);

	if (!pte)
		panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
		      __func__, n_pages * sizeof(pte_t), PAGE_SIZE);

	pr_debug("%s: %p - %p\n", __func__, start, end);

	for (i = j = 0; i < n_pmds; ++i) {
		int k;

		for (k = 0; k < PTRS_PER_PTE; ++k, ++j) {
			phys_addr_t phys =
				memblock_phys_alloc_range(PAGE_SIZE, PAGE_SIZE,
							  0,
							  MEMBLOCK_ALLOC_ANYWHERE);

			if (!phys)
				panic("Failed to allocate page table page\n");

			set_pte(pte + j, pfn_pte(PHYS_PFN(phys), PAGE_KERNEL));
		}
	}

	for (i = 0; i < n_pmds ; ++i, pte += PTRS_PER_PTE)
		set_pmd(pmd + i, __pmd((unsigned long)pte));

	local_flush_tlb_all();
	memset(start, 0, end - start);
}