500asmlinkage __visible void __init start_kernel(void)
    501{
    502 char *command_line;
    503 char *after_dashes;
    504
    505 /*
    506  * Need to run as early as possible, to initialize the
    507  * lockdep hash:
    508  */
    509 lockdep_init();
    510 set_task_stack_end_magic(&init_task);
    511 smp_setup_processor_id();
    512 debug_objects_early_init();
    513
    514 /*
    515  * Set up the the initial canary ASAP:
    516  */
    517 boot_init_stack_canary();
    518
    519 cgroup_init_early();
    520
    521 local_irq_disable();
    522 early_boot_irqs_disabled = true;
    523
    524/*
    525 * Interrupts are still disabled. Do necessary setups, then
    526 * enable them
    527 */
    528 boot_cpu_init();
    529 page_address_init();
    530 pr_notice("%s", linux_banner);
    531 setup_arch(&command_line);
    532 mm_init_cpumask(&init_mm);
    533 setup_command_line(command_line);
    534 setup_nr_cpu_ids();
    535 setup_per_cpu_areas();
    536 smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */
    537
    538 build_all_zonelists(NULL, NULL);
    539 page_alloc_init();
    540
    541 pr_notice("Kernel command line: %s\n", boot_command_line);
    542 parse_early_param();
    543 after_dashes = parse_args("Booting kernel",
    544               static_command_line, __start___param,
    545               __stop___param - __start___param,
    546               -1, -1, &unknown_bootoption);
    547 if (!IS_ERR_OR_NULL(after_dashes))
    548     parse_args("Setting init args", after_dashes, NULL, 0, -1, -1,
    549            set_init_arg);
    550
    551 jump_label_init();
    552
    553 /*
    554  * These use large bootmem allocations and must precede
    555  * kmem_cache_init()
    556  */
    557 setup_log_buf(0);
    558 pidhash_init();
    559 vfs_caches_init_early();
    560 sort_main_extable();
    561 trap_init();
    562 mm_init();
    563
    564 /*
    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  */
    569 sched_init();
    570 /*
    571  * Disable preemption - early bootup scheduling is extremely
    572  * fragile until we cpu_idle() for the first time.
    573  */
    574 preempt_disable();
    575 if (WARN(!irqs_disabled(),
    576      "Interrupts were enabled *very* early, fixing it\n"))
    577     local_irq_disable();
    578 idr_init_cache();
    579 rcu_init();
    580 context_tracking_init();
    581 radix_tree_init();
    582 /* init some links before init_ISA_irqs() */
    583 early_irq_init();
    584 init_IRQ();
    585 tick_init();
    586 rcu_init_nohz();
    587 init_timers();
    588 hrtimers_init();
    589 softirq_init();
    590 timekeeping_init();
    591 time_init();
    592 sched_clock_postinit();
    593 perf_event_init();
    594 profile_init();
    595 call_function_init();
    596 WARN(!irqs_disabled(), "Interrupts were enabled early\n");
    597 early_boot_irqs_disabled = false;
    598 local_irq_enable();
    599
    600 kmem_cache_init_late();
    601
    602 /*
    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  */
    607 console_init();
    608 if (panic_later)
    609     panic("Too many boot %s vars at `%s‘", panic_later,
    610           panic_param);
    611
    612 lockdep_info();
    613
    614 /*
    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  */
    619 locking_selftest();
    620
    621#ifdef CONFIG_BLK_DEV_INITRD
    622 if (initrd_start && !initrd_below_start_ok &&
    623     page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) {
    624     pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n",
    625         page_to_pfn(virt_to_page((void *)initrd_start)),
    626         min_low_pfn);
    627     initrd_start = 0;
    628 }
    629#endif
    630 page_cgroup_init();
    631 debug_objects_mem_init();
    632 kmemleak_init();
    633 setup_per_cpu_pageset();
    634 numa_policy_init();
    635 if (late_time_init)
    636     late_time_init();
    637 sched_clock_init();
    638 calibrate_delay();
    639 pidmap_init();
    640 anon_vma_init();
    641 acpi_early_init();
    642#ifdef CONFIG_X86
    643 if (efi_enabled(EFI_RUNTIME_SERVICES))
    644     efi_enter_virtual_mode();
    645#endif
    646#ifdef CONFIG_X86_ESPFIX64
    647 /* Should be run before the first non-init thread is created */
    648 init_espfix_bsp();
    649#endif
    650 thread_info_cache_init();
    651 cred_init();
    652 fork_init(totalram_pages);
    653 proc_caches_init();
    654 buffer_init();
    655 key_init();
    656 security_init();
    657 dbg_late_init();
    658 vfs_caches_init(totalram_pages);
    659 signals_init();
    660 /* rootfs populating might need page-writeback */
    661 page_writeback_init();
    662 proc_root_init();
    663 cgroup_init();
    664 cpuset_init();
    665 taskstats_init_early();
    666 delayacct_init();
    667
    668 check_bugs();
    669
    670 sfi_init_late();
    671
    672 if (efi_enabled(EFI_RUNTIME_SERVICES)) {
    673     efi_late_init();
    674     efi_free_boot_services();
    675 }
    676
    677 ftrace_init();
    678
    679 /* Do the rest non-__init‘ed, we‘re now alive */
    680 rest_init();
    681}