Esempio n. 1
0
static int init(void * unused)
{
    lock_kernel();
    /*
     * init can run on any cpu.
     */
    set_cpus_allowed(current, CPU_MASK_ALL);
    /*
     * Tell the world that we're going to be the grim
     * reaper of innocent orphaned children.
     *
     * We don't want people to have to make incorrect
     * assumptions about where in the task array this
     * can be found.
     */
    child_reaper = current;

    smp_prepare_cpus(max_cpus);

    init_hardirqs();

    do_pre_smp_initcalls();

    smp_init();
    sched_init_smp();

    cpuset_init_smp();

    /*
     * Do this before initcalls, because some drivers want to access
     * firmware files.
     */
    populate_rootfs();

    do_basic_setup();

    /*
     * check if there is an early userspace init.  If yes, let it do all
     * the work
     */

    if (!ramdisk_execute_command)
        ramdisk_execute_command = "/init";

    if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) {
        ramdisk_execute_command = NULL;
        prepare_namespace();
    }
#ifdef CONFIG_PREEMPT_RT
    WARN_ON(irqs_disabled());
#endif

#define DEBUG_COUNT (defined(CONFIG_DEBUG_RT_MUTEXES) + defined(CONFIG_DEBUG_PREEMPT) + defined(CONFIG_CRITICAL_PREEMPT_TIMING) + defined(CONFIG_CRITICAL_IRQSOFF_TIMING) + defined(CONFIG_LATENCY_TRACE) + defined(CONFIG_DEBUG_SLAB) + defined(CONFIG_DEBUG_PAGEALLOC) + defined(CONFIG_LOCKDEP))

#if DEBUG_COUNT > 0
    printk(KERN_ERR "*****************************************************************************\n");
    printk(KERN_ERR "*                                                                           *\n");
#if DEBUG_COUNT == 1
    printk(KERN_ERR "*  REMINDER, the following debugging option is turned on in your .config:   *\n");
#else
    printk(KERN_ERR "*  REMINDER, the following debugging options are turned on in your .config: *\n");
#endif
    printk(KERN_ERR "*                                                                           *\n");
#ifdef CONFIG_DEBUG_RT_MUTEXES
    printk(KERN_ERR "*        CONFIG_DEBUG_RT_MUTEXES                                             *\n");
#endif
#ifdef CONFIG_DEBUG_PREEMPT
    printk(KERN_ERR "*        CONFIG_DEBUG_PREEMPT                                               *\n");
#endif
#ifdef CONFIG_CRITICAL_PREEMPT_TIMING
    printk(KERN_ERR "*        CONFIG_CRITICAL_PREEMPT_TIMING                                     *\n");
#endif
#ifdef CONFIG_CRITICAL_IRQSOFF_TIMING
    printk(KERN_ERR "*        CONFIG_CRITICAL_IRQSOFF_TIMING                                     *\n");
#endif
#ifdef CONFIG_LATENCY_TRACE
    printk(KERN_ERR "*        CONFIG_LATENCY_TRACE                                               *\n");
#endif
#ifdef CONFIG_DEBUG_SLAB
    printk(KERN_ERR "*        CONFIG_DEBUG_SLAB                                                  *\n");
#endif
#ifdef CONFIG_DEBUG_PAGEALLOC
    printk(KERN_ERR "*        CONFIG_DEBUG_PAGEALLOC                                             *\n");
#endif
#ifdef CONFIG_LOCKDEP
    printk(KERN_ERR "*        CONFIG_LOCKDEP                                                     *\n");
#endif
    printk(KERN_ERR "*                                                                           *\n");
#if DEBUG_COUNT == 1
    printk(KERN_ERR "*  it may increase runtime overhead and latencies.                          *\n");
#else
    printk(KERN_ERR "*  they may increase runtime overhead and latencies.                        *\n");
#endif
    printk(KERN_ERR "*                                                                           *\n");
    printk(KERN_ERR "*****************************************************************************\n");
#endif
    /*
     * Ok, we have completed the initial bootup, and
     * we're essentially up and running. Get rid of the
     * initmem segments and start the user-mode stuff..
     */
    free_initmem();
    unlock_kernel();
    mark_rodata_ro();
    system_state = SYSTEM_RUNNING;
    numa_default_policy();

    if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
        printk(KERN_WARNING "Warning: unable to open an initial console.\n");

    (void) sys_dup(0);
    (void) sys_dup(0);

    if (ramdisk_execute_command) {
        run_init_process(ramdisk_execute_command);
        printk(KERN_WARNING "Failed to execute %s\n",
               ramdisk_execute_command);
    }
#ifdef CONFIG_PREEMPT_RT
    WARN_ON(irqs_disabled());
#endif

    /*
     * We try each of these until one succeeds.
     *
     * The Bourne shell can be used instead of init if we are
     * trying to recover a really broken machine.
     */
    if (execute_command) {
        run_init_process(execute_command);
        printk(KERN_WARNING "Failed to execute %s.  Attempting "
               "defaults...\n", execute_command);
    }
    run_init_process("/sbin/init");
    run_init_process("/etc/init");
    run_init_process("/bin/init");
    run_init_process("/bin/sh");

    panic("No init found.  Try passing init= option to kernel.");
}
Esempio n. 2
0
static int init(void * unused)
{
	lock_kernel();
	/*
	 * Tell the world that we're going to be the grim
	 * reaper of innocent orphaned children.
	 *
	 * We don't want people to have to make incorrect
	 * assumptions about where in the task array this
	 * can be found.
	 */
	child_reaper = current;

	/* Sets up cpus_possible() */
	smp_prepare_cpus(max_cpus);

	init_hardirqs();

	do_pre_smp_initcalls();

	fixup_cpu_present_map();
	smp_init();
	sched_init_smp();

	/*
	 * Do this before initcalls, because some drivers want to access
	 * firmware files.
	 */
	populate_rootfs();

	do_basic_setup();

	/*
	 * check if there is an early userspace init.  If yes, let it do all
	 * the work
	 */
	if (sys_access((const char __user *) "/init", 0) == 0)
		execute_command = "/init";
	else
		prepare_namespace();

	/*
	 * Ok, we have completed the initial bootup, and
	 * we're essentially up and running. Get rid of the
	 * initmem segments and start the user-mode stuff..
	 */
	free_initmem();
	unlock_kernel();
	system_state = SYSTEM_RUNNING;
	numa_default_policy();

	if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
		printk("Warning: unable to open an initial console.\n");

	(void) sys_dup(0);
	(void) sys_dup(0);
	
	/*
	 * We try each of these until one succeeds.
	 *
	 * The Bourne shell can be used instead of init if we are 
	 * trying to recover a really broken machine.
	 */
#ifdef CONFIG_KFI_BOOT_TIMING
	to_userspace();
#endif

	if (execute_command)
		run_init_process(execute_command);

	run_init_process("/sbin/init");
	run_init_process("/etc/init");
	run_init_process("/bin/init");
	run_init_process("/bin/sh");

	panic("No init found.  Try passing init= option to kernel.");
}