void __init setup_arch()

in kernel/setup.c [949:1059]

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

void __init setup_arch(char **cmdline_p)
{
        /*
         * print what head.S has found out about the machine
         */
	if (MACHINE_IS_VM)
		pr_info("Linux is running as a z/VM "
			"guest operating system in 64-bit mode\n");
	else if (MACHINE_IS_KVM)
		pr_info("Linux is running under KVM in 64-bit mode\n");
	else if (MACHINE_IS_LPAR)
		pr_info("Linux is running natively in 64-bit mode\n");
	else
		pr_info("Linux is running as a guest in 64-bit mode\n");

	log_component_list();

	/* Have one command line that is parsed and saved in /proc/cmdline */
	/* boot_command_line has been already set up in early.c */
	*cmdline_p = boot_command_line;

        ROOT_DEV = Root_RAM0;

	setup_initial_init_mm(_text, _etext, _edata, _end);

	if (IS_ENABLED(CONFIG_EXPOLINE_AUTO))
		nospec_auto_detect();

	jump_label_init();
	parse_early_param();
#ifdef CONFIG_CRASH_DUMP
	/* Deactivate elfcorehdr= kernel parameter */
	elfcorehdr_addr = ELFCORE_ADDR_MAX;
#endif

	os_info_init();
	setup_ipl();
	setup_task_size();
	setup_control_program_code();

	/* Do some memory reservations *before* memory is added to memblock */
	reserve_kernel();
	reserve_initrd();
	reserve_certificate_list();
	reserve_mem_detect_info();
	memblock_set_current_limit(ident_map_size);
	memblock_allow_resize();

	/* Get information about *all* installed memory */
	memblock_add_mem_detect_info();

	free_mem_detect_info();
	setup_memory_end();
	memblock_dump_all();
	setup_memory();

	relocate_amode31_section();
	setup_cr();
	setup_uv();
	dma_contiguous_reserve(ident_map_size);
	vmcp_cma_reserve();
	if (MACHINE_HAS_EDAT2)
		hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);

	check_initrd();
	reserve_crashkernel();
#ifdef CONFIG_CRASH_DUMP
	/*
	 * Be aware that smp_save_dump_cpus() triggers a system reset.
	 * Therefore CPU and device initialization should be done afterwards.
	 */
	smp_save_dump_cpus();
#endif

	setup_resources();
	setup_lowcore_dat_off();
	smp_fill_possible_mask();
	cpu_detect_mhz_feature();
        cpu_init();
	numa_setup();
	smp_detect_cpus();
	topology_init_early();

	if (test_facility(193))
		static_branch_enable(&cpu_has_bear);

	/*
	 * Create kernel page tables and switch to virtual addressing.
	 */
        paging_init();

	/*
	 * After paging_init created the kernel page table, the new PSWs
	 * in lowcore can now run with DAT enabled.
	 */
	setup_lowcore_dat_on();

        /* Setup default console */
	conmode_default();
	set_preferred_console();

	apply_alternative_instructions();
	if (IS_ENABLED(CONFIG_EXPOLINE))
		nospec_init_branches();

	/* Setup zfcp/nvme dump support */
	setup_zfcpdump();

	/* Add system specific data to the random pool */
	setup_randomness();
}