hwmon: (sis5595) Use pr_fmt and pr_<level>
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / init / main.c
blob00799c1d46288fb491e6eb07ccf17dc8406883cc
1 /*
2 * linux/init/main.c
4 * Copyright (C) 1991, 1992 Linus Torvalds
6 * GK 2/5/95 - Changed to support mounting root fs via NFS
7 * Added initrd & change_root: Werner Almesberger & Hans Lermen, Feb '96
8 * Moan early if gcc is old, avoiding bogus kernels - Paul Gortmaker, May '96
9 * Simplified starting of init: Michael A. Griffith <grif@acm.org>
12 #include <linux/types.h>
13 #include <linux/module.h>
14 #include <linux/proc_fs.h>
15 #include <linux/kernel.h>
16 #include <linux/syscalls.h>
17 #include <linux/stackprotector.h>
18 #include <linux/string.h>
19 #include <linux/ctype.h>
20 #include <linux/delay.h>
21 #include <linux/ioport.h>
22 #include <linux/init.h>
23 #include <linux/initrd.h>
24 #include <linux/bootmem.h>
25 #include <linux/acpi.h>
26 #include <linux/tty.h>
27 #include <linux/percpu.h>
28 #include <linux/kmod.h>
29 #include <linux/vmalloc.h>
30 #include <linux/kernel_stat.h>
31 #include <linux/start_kernel.h>
32 #include <linux/security.h>
33 #include <linux/smp.h>
34 #include <linux/profile.h>
35 #include <linux/rcupdate.h>
36 #include <linux/moduleparam.h>
37 #include <linux/kallsyms.h>
38 #include <linux/writeback.h>
39 #include <linux/cpu.h>
40 #include <linux/cpuset.h>
41 #include <linux/cgroup.h>
42 #include <linux/efi.h>
43 #include <linux/tick.h>
44 #include <linux/interrupt.h>
45 #include <linux/taskstats_kern.h>
46 #include <linux/delayacct.h>
47 #include <linux/unistd.h>
48 #include <linux/rmap.h>
49 #include <linux/mempolicy.h>
50 #include <linux/key.h>
51 #include <linux/buffer_head.h>
52 #include <linux/page_cgroup.h>
53 #include <linux/debug_locks.h>
54 #include <linux/debugobjects.h>
55 #include <linux/lockdep.h>
56 #include <linux/kmemleak.h>
57 #include <linux/pid_namespace.h>
58 #include <linux/device.h>
59 #include <linux/kthread.h>
60 #include <linux/sched.h>
61 #include <linux/signal.h>
62 #include <linux/idr.h>
63 #include <linux/kgdb.h>
64 #include <linux/ftrace.h>
65 #include <linux/async.h>
66 #include <linux/kmemcheck.h>
67 #include <linux/sfi.h>
68 #include <linux/shmem_fs.h>
69 #include <linux/slab.h>
70 #include <linux/perf_event.h>
72 #include <asm/io.h>
73 #include <asm/bugs.h>
74 #include <asm/setup.h>
75 #include <asm/sections.h>
76 #include <asm/cacheflush.h>
78 #ifdef CONFIG_X86_LOCAL_APIC
79 #include <asm/smp.h>
80 #endif
82 static int kernel_init(void *);
84 extern void init_IRQ(void);
85 extern void fork_init(unsigned long);
86 extern void mca_init(void);
87 extern void sbus_init(void);
88 extern void prio_tree_init(void);
89 extern void radix_tree_init(void);
90 extern void free_initmem(void);
91 #ifndef CONFIG_DEBUG_RODATA
92 static inline void mark_rodata_ro(void) { }
93 #endif
95 #ifdef CONFIG_TC
96 extern void tc_init(void);
97 #endif
99 enum system_states system_state __read_mostly;
100 EXPORT_SYMBOL(system_state);
103 * Boot command-line arguments
105 #define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT
106 #define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT
108 extern void time_init(void);
109 /* Default late time init is NULL. archs can override this later. */
110 void (*__initdata late_time_init)(void);
111 extern void softirq_init(void);
113 /* Untouched command line saved by arch-specific code. */
114 char __initdata boot_command_line[COMMAND_LINE_SIZE];
115 /* Untouched saved command line (eg. for /proc) */
116 char *saved_command_line;
117 /* Command line for parameter parsing */
118 static char *static_command_line;
120 static char *execute_command;
121 static char *ramdisk_execute_command;
123 #ifdef CONFIG_SMP
124 /* Setup configured maximum number of CPUs to activate */
125 unsigned int setup_max_cpus = NR_CPUS;
126 EXPORT_SYMBOL(setup_max_cpus);
130 * Setup routine for controlling SMP activation
132 * Command-line option of "nosmp" or "maxcpus=0" will disable SMP
133 * activation entirely (the MPS table probe still happens, though).
135 * Command-line option of "maxcpus=<NUM>", where <NUM> is an integer
136 * greater than 0, limits the maximum number of CPUs activated in
137 * SMP mode to <NUM>.
140 void __weak arch_disable_smp_support(void) { }
142 static int __init nosmp(char *str)
144 setup_max_cpus = 0;
145 arch_disable_smp_support();
147 return 0;
150 early_param("nosmp", nosmp);
152 /* this is hard limit */
153 static int __init nrcpus(char *str)
155 int nr_cpus;
157 get_option(&str, &nr_cpus);
158 if (nr_cpus > 0 && nr_cpus < nr_cpu_ids)
159 nr_cpu_ids = nr_cpus;
161 return 0;
164 early_param("nr_cpus", nrcpus);
166 static int __init maxcpus(char *str)
168 get_option(&str, &setup_max_cpus);
169 if (setup_max_cpus == 0)
170 arch_disable_smp_support();
172 return 0;
175 early_param("maxcpus", maxcpus);
176 #else
177 static const unsigned int setup_max_cpus = NR_CPUS;
178 #endif
181 * If set, this is an indication to the drivers that reset the underlying
182 * device before going ahead with the initialization otherwise driver might
183 * rely on the BIOS and skip the reset operation.
185 * This is useful if kernel is booting in an unreliable environment.
186 * For ex. kdump situaiton where previous kernel has crashed, BIOS has been
187 * skipped and devices will be in unknown state.
189 unsigned int reset_devices;
190 EXPORT_SYMBOL(reset_devices);
192 static int __init set_reset_devices(char *str)
194 reset_devices = 1;
195 return 1;
198 __setup("reset_devices", set_reset_devices);
200 static const char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
201 const char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };
202 static const char *panic_later, *panic_param;
204 extern const struct obs_kernel_param __setup_start[], __setup_end[];
206 static int __init obsolete_checksetup(char *line)
208 const struct obs_kernel_param *p;
209 int had_early_param = 0;
211 p = __setup_start;
212 do {
213 int n = strlen(p->str);
214 if (!strncmp(line, p->str, n)) {
215 if (p->early) {
216 /* Already done in parse_early_param?
217 * (Needs exact match on param part).
218 * Keep iterating, as we can have early
219 * params and __setups of same names 8( */
220 if (line[n] == '\0' || line[n] == '=')
221 had_early_param = 1;
222 } else if (!p->setup_func) {
223 printk(KERN_WARNING "Parameter %s is obsolete,"
224 " ignored\n", p->str);
225 return 1;
226 } else if (p->setup_func(line + n))
227 return 1;
229 p++;
230 } while (p < __setup_end);
232 return had_early_param;
236 * This should be approx 2 Bo*oMips to start (note initial shift), and will
237 * still work even if initially too large, it will just take slightly longer
239 unsigned long loops_per_jiffy = (1<<12);
241 EXPORT_SYMBOL(loops_per_jiffy);
243 static int __init debug_kernel(char *str)
245 console_loglevel = 10;
246 return 0;
249 static int __init quiet_kernel(char *str)
251 console_loglevel = 4;
252 return 0;
255 early_param("debug", debug_kernel);
256 early_param("quiet", quiet_kernel);
258 static int __init loglevel(char *str)
260 get_option(&str, &console_loglevel);
261 return 0;
264 early_param("loglevel", loglevel);
267 * Unknown boot options get handed to init, unless they look like
268 * unused parameters (modprobe will find them in /proc/cmdline).
270 static int __init unknown_bootoption(char *param, char *val)
272 /* Change NUL term back to "=", to make "param" the whole string. */
273 if (val) {
274 /* param=val or param="val"? */
275 if (val == param+strlen(param)+1)
276 val[-1] = '=';
277 else if (val == param+strlen(param)+2) {
278 val[-2] = '=';
279 memmove(val-1, val, strlen(val)+1);
280 val--;
281 } else
282 BUG();
285 /* Handle obsolete-style parameters */
286 if (obsolete_checksetup(param))
287 return 0;
289 /* Unused module parameter. */
290 if (strchr(param, '.') && (!val || strchr(param, '.') < val))
291 return 0;
293 if (panic_later)
294 return 0;
296 if (val) {
297 /* Environment option */
298 unsigned int i;
299 for (i = 0; envp_init[i]; i++) {
300 if (i == MAX_INIT_ENVS) {
301 panic_later = "Too many boot env vars at `%s'";
302 panic_param = param;
304 if (!strncmp(param, envp_init[i], val - param))
305 break;
307 envp_init[i] = param;
308 } else {
309 /* Command line option */
310 unsigned int i;
311 for (i = 0; argv_init[i]; i++) {
312 if (i == MAX_INIT_ARGS) {
313 panic_later = "Too many boot init vars at `%s'";
314 panic_param = param;
317 argv_init[i] = param;
319 return 0;
322 #ifdef CONFIG_DEBUG_PAGEALLOC
323 int __read_mostly debug_pagealloc_enabled = 0;
324 #endif
326 static int __init init_setup(char *str)
328 unsigned int i;
330 execute_command = str;
332 * In case LILO is going to boot us with default command line,
333 * it prepends "auto" before the whole cmdline which makes
334 * the shell think it should execute a script with such name.
335 * So we ignore all arguments entered _before_ init=... [MJ]
337 for (i = 1; i < MAX_INIT_ARGS; i++)
338 argv_init[i] = NULL;
339 return 1;
341 __setup("init=", init_setup);
343 static int __init rdinit_setup(char *str)
345 unsigned int i;
347 ramdisk_execute_command = str;
348 /* See "auto" comment in init_setup */
349 for (i = 1; i < MAX_INIT_ARGS; i++)
350 argv_init[i] = NULL;
351 return 1;
353 __setup("rdinit=", rdinit_setup);
355 #ifndef CONFIG_SMP
357 #ifdef CONFIG_X86_LOCAL_APIC
358 static void __init smp_init(void)
360 APIC_init_uniprocessor();
362 #else
363 #define smp_init() do { } while (0)
364 #endif
366 static inline void setup_nr_cpu_ids(void) { }
367 static inline void smp_prepare_cpus(unsigned int maxcpus) { }
369 #else
371 /* Setup number of possible processor ids */
372 int nr_cpu_ids __read_mostly = NR_CPUS;
373 EXPORT_SYMBOL(nr_cpu_ids);
375 /* An arch may set nr_cpu_ids earlier if needed, so this would be redundant */
376 static void __init setup_nr_cpu_ids(void)
378 nr_cpu_ids = find_last_bit(cpumask_bits(cpu_possible_mask),NR_CPUS) + 1;
381 /* Called by boot processor to activate the rest. */
382 static void __init smp_init(void)
384 unsigned int cpu;
386 /* FIXME: This should be done in userspace --RR */
387 for_each_present_cpu(cpu) {
388 if (num_online_cpus() >= setup_max_cpus)
389 break;
390 if (!cpu_online(cpu))
391 cpu_up(cpu);
394 /* Any cleanup work */
395 printk(KERN_INFO "Brought up %ld CPUs\n", (long)num_online_cpus());
396 smp_cpus_done(setup_max_cpus);
399 #endif
402 * We need to store the untouched command line for future reference.
403 * We also need to store the touched command line since the parameter
404 * parsing is performed in place, and we should allow a component to
405 * store reference of name/value for future reference.
407 static void __init setup_command_line(char *command_line)
409 saved_command_line = alloc_bootmem(strlen (boot_command_line)+1);
410 static_command_line = alloc_bootmem(strlen (command_line)+1);
411 strcpy (saved_command_line, boot_command_line);
412 strcpy (static_command_line, command_line);
416 * We need to finalize in a non-__init function or else race conditions
417 * between the root thread and the init thread may cause start_kernel to
418 * be reaped by free_initmem before the root thread has proceeded to
419 * cpu_idle.
421 * gcc-3.4 accidentally inlines this function, so use noinline.
424 static __initdata DECLARE_COMPLETION(kthreadd_done);
426 static noinline void __init_refok rest_init(void)
428 int pid;
430 rcu_scheduler_starting();
432 * We need to spawn init first so that it obtains pid 1, however
433 * the init task will end up wanting to create kthreads, which, if
434 * we schedule it before we create kthreadd, will OOPS.
436 kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND);
437 numa_default_policy();
438 pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES);
439 rcu_read_lock();
440 kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns);
441 rcu_read_unlock();
442 complete(&kthreadd_done);
445 * The boot idle thread must execute schedule()
446 * at least once to get things moving:
448 init_idle_bootup_task(current);
449 preempt_enable_no_resched();
450 schedule();
451 preempt_disable();
453 /* Call into cpu_idle with preempt disabled */
454 cpu_idle();
457 /* Check for early params. */
458 static int __init do_early_param(char *param, char *val)
460 const struct obs_kernel_param *p;
462 for (p = __setup_start; p < __setup_end; p++) {
463 if ((p->early && strcmp(param, p->str) == 0) ||
464 (strcmp(param, "console") == 0 &&
465 strcmp(p->str, "earlycon") == 0)
467 if (p->setup_func(val) != 0)
468 printk(KERN_WARNING
469 "Malformed early option '%s'\n", param);
472 /* We accept everything at this stage. */
473 return 0;
476 void __init parse_early_options(char *cmdline)
478 parse_args("early options", cmdline, NULL, 0, do_early_param);
481 /* Arch code calls this early on, or if not, just before other parsing. */
482 void __init parse_early_param(void)
484 static __initdata int done = 0;
485 static __initdata char tmp_cmdline[COMMAND_LINE_SIZE];
487 if (done)
488 return;
490 /* All fall through to do_early_param. */
491 strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
492 parse_early_options(tmp_cmdline);
493 done = 1;
497 * Activate the first processor.
500 static void __init boot_cpu_init(void)
502 int cpu = smp_processor_id();
503 /* Mark the boot cpu "present", "online" etc for SMP and UP case */
504 set_cpu_online(cpu, true);
505 set_cpu_active(cpu, true);
506 set_cpu_present(cpu, true);
507 set_cpu_possible(cpu, true);
510 void __init __weak smp_setup_processor_id(void)
514 void __init __weak thread_info_cache_init(void)
519 * Set up kernel memory allocators
521 static void __init mm_init(void)
524 * page_cgroup requires countinous pages as memmap
525 * and it's bigger than MAX_ORDER unless SPARSEMEM.
527 page_cgroup_init_flatmem();
528 mem_init();
529 kmem_cache_init();
530 percpu_init_late();
531 pgtable_cache_init();
532 vmalloc_init();
535 asmlinkage void __init start_kernel(void)
537 char * command_line;
538 extern const struct kernel_param __start___param[], __stop___param[];
540 smp_setup_processor_id();
543 * Need to run as early as possible, to initialize the
544 * lockdep hash:
546 lockdep_init();
547 debug_objects_early_init();
550 * Set up the the initial canary ASAP:
552 boot_init_stack_canary();
554 cgroup_init_early();
556 local_irq_disable();
557 early_boot_irqs_off();
560 * Interrupts are still disabled. Do necessary setups, then
561 * enable them
563 tick_init();
564 boot_cpu_init();
565 page_address_init();
566 printk(KERN_NOTICE "%s", linux_banner);
567 setup_arch(&command_line);
568 mm_init_owner(&init_mm, &init_task);
569 setup_command_line(command_line);
570 setup_nr_cpu_ids();
571 setup_per_cpu_areas();
572 smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */
574 build_all_zonelists(NULL);
575 page_alloc_init();
577 printk(KERN_NOTICE "Kernel command line: %s\n", boot_command_line);
578 parse_early_param();
579 parse_args("Booting kernel", static_command_line, __start___param,
580 __stop___param - __start___param,
581 &unknown_bootoption);
583 * These use large bootmem allocations and must precede
584 * kmem_cache_init()
586 pidhash_init();
587 vfs_caches_init_early();
588 sort_main_extable();
589 trap_init();
590 mm_init();
592 * Set up the scheduler prior starting any interrupts (such as the
593 * timer interrupt). Full topology setup happens at smp_init()
594 * time - but meanwhile we still have a functioning scheduler.
596 sched_init();
598 * Disable preemption - early bootup scheduling is extremely
599 * fragile until we cpu_idle() for the first time.
601 preempt_disable();
602 if (!irqs_disabled()) {
603 printk(KERN_WARNING "start_kernel(): bug: interrupts were "
604 "enabled *very* early, fixing it\n");
605 local_irq_disable();
607 idr_init_cache();
608 perf_event_init();
609 rcu_init();
610 radix_tree_init();
611 /* init some links before init_ISA_irqs() */
612 early_irq_init();
613 init_IRQ();
614 prio_tree_init();
615 init_timers();
616 hrtimers_init();
617 softirq_init();
618 timekeeping_init();
619 time_init();
620 profile_init();
621 if (!irqs_disabled())
622 printk(KERN_CRIT "start_kernel(): bug: interrupts were "
623 "enabled early\n");
624 early_boot_irqs_on();
625 local_irq_enable();
627 /* Interrupts are enabled now so all GFP allocations are safe. */
628 gfp_allowed_mask = __GFP_BITS_MASK;
630 kmem_cache_init_late();
633 * HACK ALERT! This is early. We're enabling the console before
634 * we've done PCI setups etc, and console_init() must be aware of
635 * this. But we do want output early, in case something goes wrong.
637 console_init();
638 if (panic_later)
639 panic(panic_later, panic_param);
641 lockdep_info();
644 * Need to run this when irqs are enabled, because it wants
645 * to self-test [hard/soft]-irqs on/off lock inversion bugs
646 * too:
648 locking_selftest();
650 #ifdef CONFIG_BLK_DEV_INITRD
651 if (initrd_start && !initrd_below_start_ok &&
652 page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) {
653 printk(KERN_CRIT "initrd overwritten (0x%08lx < 0x%08lx) - "
654 "disabling it.\n",
655 page_to_pfn(virt_to_page((void *)initrd_start)),
656 min_low_pfn);
657 initrd_start = 0;
659 #endif
660 page_cgroup_init();
661 enable_debug_pagealloc();
662 kmemleak_init();
663 debug_objects_mem_init();
664 setup_per_cpu_pageset();
665 numa_policy_init();
666 if (late_time_init)
667 late_time_init();
668 sched_clock_init();
669 calibrate_delay();
670 pidmap_init();
671 anon_vma_init();
672 #ifdef CONFIG_X86
673 if (efi_enabled)
674 efi_enter_virtual_mode();
675 #endif
676 thread_info_cache_init();
677 cred_init();
678 fork_init(totalram_pages);
679 proc_caches_init();
680 buffer_init();
681 key_init();
682 security_init();
683 dbg_late_init();
684 vfs_caches_init(totalram_pages);
685 signals_init();
686 /* rootfs populating might need page-writeback */
687 page_writeback_init();
688 #ifdef CONFIG_PROC_FS
689 proc_root_init();
690 #endif
691 cgroup_init();
692 cpuset_init();
693 taskstats_init_early();
694 delayacct_init();
696 check_bugs();
698 acpi_early_init(); /* before LAPIC and SMP init */
699 sfi_init_late();
701 ftrace_init();
703 /* Do the rest non-__init'ed, we're now alive */
704 rest_init();
707 /* Call all constructor functions linked into the kernel. */
708 static void __init do_ctors(void)
710 #ifdef CONFIG_CONSTRUCTORS
711 ctor_fn_t *fn = (ctor_fn_t *) __ctors_start;
713 for (; fn < (ctor_fn_t *) __ctors_end; fn++)
714 (*fn)();
715 #endif
718 int initcall_debug;
719 core_param(initcall_debug, initcall_debug, bool, 0644);
721 static char msgbuf[64];
723 static int __init_or_module do_one_initcall_debug(initcall_t fn)
725 ktime_t calltime, delta, rettime;
726 unsigned long long duration;
727 int ret;
729 printk(KERN_DEBUG "calling %pF @ %i\n", fn, task_pid_nr(current));
730 calltime = ktime_get();
731 ret = fn();
732 rettime = ktime_get();
733 delta = ktime_sub(rettime, calltime);
734 duration = (unsigned long long) ktime_to_ns(delta) >> 10;
735 printk(KERN_DEBUG "initcall %pF returned %d after %lld usecs\n", fn,
736 ret, duration);
738 return ret;
741 int __init_or_module do_one_initcall(initcall_t fn)
743 int count = preempt_count();
744 int ret;
746 if (initcall_debug)
747 ret = do_one_initcall_debug(fn);
748 else
749 ret = fn();
751 msgbuf[0] = 0;
753 if (ret && ret != -ENODEV && initcall_debug)
754 sprintf(msgbuf, "error code %d ", ret);
756 if (preempt_count() != count) {
757 strlcat(msgbuf, "preemption imbalance ", sizeof(msgbuf));
758 preempt_count() = count;
760 if (irqs_disabled()) {
761 strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf));
762 local_irq_enable();
764 if (msgbuf[0]) {
765 printk("initcall %pF returned with %s\n", fn, msgbuf);
768 return ret;
772 extern initcall_t __initcall_start[], __initcall_end[], __early_initcall_end[];
774 static void __init do_initcalls(void)
776 initcall_t *fn;
778 for (fn = __early_initcall_end; fn < __initcall_end; fn++)
779 do_one_initcall(*fn);
783 * Ok, the machine is now initialized. None of the devices
784 * have been touched yet, but the CPU subsystem is up and
785 * running, and memory and process management works.
787 * Now we can finally start doing some real work..
789 static void __init do_basic_setup(void)
791 cpuset_init_smp();
792 usermodehelper_init();
793 init_tmpfs();
794 driver_init();
795 init_irq_proc();
796 do_ctors();
797 do_initcalls();
800 static void __init do_pre_smp_initcalls(void)
802 initcall_t *fn;
804 for (fn = __initcall_start; fn < __early_initcall_end; fn++)
805 do_one_initcall(*fn);
808 static void run_init_process(const char *init_filename)
810 argv_init[0] = init_filename;
811 kernel_execve(init_filename, argv_init, envp_init);
814 /* This is a non __init function. Force it to be noinline otherwise gcc
815 * makes it inline to init() and it becomes part of init.text section
817 static noinline int init_post(void)
819 /* need to finish all async __init code before freeing the memory */
820 async_synchronize_full();
821 free_initmem();
822 mark_rodata_ro();
823 system_state = SYSTEM_RUNNING;
824 numa_default_policy();
827 current->signal->flags |= SIGNAL_UNKILLABLE;
829 if (ramdisk_execute_command) {
830 run_init_process(ramdisk_execute_command);
831 printk(KERN_WARNING "Failed to execute %s\n",
832 ramdisk_execute_command);
836 * We try each of these until one succeeds.
838 * The Bourne shell can be used instead of init if we are
839 * trying to recover a really broken machine.
841 if (execute_command) {
842 run_init_process(execute_command);
843 printk(KERN_WARNING "Failed to execute %s. Attempting "
844 "defaults...\n", execute_command);
846 run_init_process("/sbin/init");
847 run_init_process("/etc/init");
848 run_init_process("/bin/init");
849 run_init_process("/bin/sh");
851 panic("No init found. Try passing init= option to kernel. "
852 "See Linux Documentation/init.txt for guidance.");
855 static int __init kernel_init(void * unused)
858 * Wait until kthreadd is all set-up.
860 wait_for_completion(&kthreadd_done);
862 * init can allocate pages on any node
864 set_mems_allowed(node_states[N_HIGH_MEMORY]);
866 * init can run on any cpu.
868 set_cpus_allowed_ptr(current, cpu_all_mask);
870 * Tell the world that we're going to be the grim
871 * reaper of innocent orphaned children.
873 * We don't want people to have to make incorrect
874 * assumptions about where in the task array this
875 * can be found.
877 init_pid_ns.child_reaper = current;
879 cad_pid = task_pid(current);
881 smp_prepare_cpus(setup_max_cpus);
883 do_pre_smp_initcalls();
884 lockup_detector_init();
886 smp_init();
887 sched_init_smp();
889 do_basic_setup();
891 /* Open the /dev/console on the rootfs, this should never fail */
892 if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
893 printk(KERN_WARNING "Warning: unable to open an initial console.\n");
895 (void) sys_dup(0);
896 (void) sys_dup(0);
898 * check if there is an early userspace init. If yes, let it do all
899 * the work
902 if (!ramdisk_execute_command)
903 ramdisk_execute_command = "/init";
905 if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) {
906 ramdisk_execute_command = NULL;
907 prepare_namespace();
911 * Ok, we have completed the initial bootup, and
912 * we're essentially up and running. Get rid of the
913 * initmem segments and start the user-mode stuff..
916 init_post();
917 return 0;