500asmlinkage __visible void __init start_kernel(void)

    {

     char *command_line;

     char *after_dashes;

     /*

    506  * Need to run as early as possible, to initialize the

    507  * lockdep hash:

    508  */

     lockdep_init();

     set_task_stack_end_magic(&init_task);

     smp_setup_processor_id();

     debug_objects_early_init();

     /*

    515  * Set up the the initial canary ASAP:

    516  */

     boot_init_stack_canary();

     cgroup_init_early();

     local_irq_disable();

     early_boot_irqs_disabled = true;

    /*

    525 * Interrupts are still disabled. Do necessary setups, then

    526 * enable them

    527 */

     boot_cpu_init();

     page_address_init();

     pr_notice("%s", linux_banner);

     setup_arch(&command_line);

     mm_init_cpumask(&init_mm);

     setup_command_line(command_line);

     setup_nr_cpu_ids();

     setup_per_cpu_areas();

     smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */

     build_all_zonelists(NULL, NULL);

     page_alloc_init();

     pr_notice("Kernel command line: %s\n", boot_command_line);

     parse_early_param();

     after_dashes = parse_args("Booting kernel",

                   static_command_line, __start___param,

                   __stop___param - __start___param,

                   -, -, &unknown_bootoption);

     if (!IS_ERR_OR_NULL(after_dashes))

         parse_args("Setting init args", after_dashes, NULL, , -, -,

                set_init_arg);

     jump_label_init();

     /*

    554  * These use large bootmem allocations and must precede

    555  * kmem_cache_init()

    556  */

     setup_log_buf();

     pidhash_init();

     vfs_caches_init_early();

     sort_main_extable();

     trap_init();  //中断向量初始化

     mm_init();  //内存管理模块初始化

     /*

    565  * Set up the scheduler prior starting any interrupts (such as the

    566  * timer interrupt). Full topology setup happens at smp_init()

    567  * time - but meanwhile we still have a functioning scheduler.

    568  */

     sched_init();  //调度模块初始化

     /*

    571  * Disable preemption - early bootup scheduling is extremely

    572  * fragile until we cpu_idle() for the first time.

    573  */

     preempt_disable();

     if (WARN(!irqs_disabled(),

          "Interrupts were enabled *very* early, fixing it\n"))

         local_irq_disable();

     idr_init_cache();

     rcu_init();

     context_tracking_init();

     radix_tree_init();

     /* init some links before init_ISA_irqs() */

     early_irq_init();

     init_IRQ();

     tick_init();

     rcu_init_nohz();

     init_timers();

     hrtimers_init();

     softirq_init();

     timekeeping_init();

     time_init();

     sched_clock_postinit();

     perf_event_init();

     profile_init();

     call_function_init();

     WARN(!irqs_disabled(), "Interrupts were enabled early\n");

     early_boot_irqs_disabled = false;

     local_irq_enable();

     kmem_cache_init_late();

     /*

    603  * HACK ALERT! This is early. We're enabling the console before

    604  * we've done PCI setups etc, and console_init() must be aware of

    605  * this. But we do want output early, in case something goes wrong.

    606  */

     console_init();

     if (panic_later)

         panic("Too many boot %s vars at `%s'", panic_later,

               panic_param);

     lockdep_info();

     /*

    615  * Need to run this when irqs are enabled, because it wants

    616  * to self-test [hard/soft]-irqs on/off lock inversion bugs

    617  * too:

    618  */

     locking_selftest();

    #ifdef CONFIG_BLK_DEV_INITRD

     if (initrd_start && !initrd_below_start_ok &&

         page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) {

         pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n",

             page_to_pfn(virt_to_page((void *)initrd_start)),

             min_low_pfn);

         initrd_start = ;

     }

    #endif

     page_cgroup_init();

     debug_objects_mem_init();

     kmemleak_init();

     setup_per_cpu_pageset();

     numa_policy_init();

     if (late_time_init)

         late_time_init();

     sched_clock_init();

     calibrate_delay();

     pidmap_init();

     anon_vma_init();

     acpi_early_init();

    #ifdef CONFIG_X86

     if (efi_enabled(EFI_RUNTIME_SERVICES))

         efi_enter_virtual_mode();

    #endif

    #ifdef CONFIG_X86_ESPFIX64

     /* Should be run before the first non-init thread is created */

     init_espfix_bsp();

    #endif

     thread_info_cache_init();

     cred_init();

     fork_init(totalram_pages);

     proc_caches_init();

     buffer_init();

     key_init();

     security_init();

     dbg_late_init();

     vfs_caches_init(totalram_pages);

     signals_init();

     /* rootfs populating might need page-writeback */

     page_writeback_init();

     proc_root_init();

     cgroup_init();

     cpuset_init();

     taskstats_init_early();

     delayacct_init();

     check_bugs();

     sfi_init_late();

     if (efi_enabled(EFI_RUNTIME_SERVICES)) {

         efi_late_init();

         efi_free_boot_services();

     }

     ftrace_init();

     /* Do the rest non-__init'ed, we're now alive */

     rest_init();  //其他模块初始化

    }