blob: f6204f712e7c639652d06cbefb70bba4df2ae7a1 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/init/main.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 *
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>
10 */
11
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/types.h>
13#include <linux/module.h>
14#include <linux/proc_fs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/kernel.h>
16#include <linux/syscalls.h>
Ingo Molnar9b5609fd2008-02-14 09:41:09 +010017#include <linux/stackprotector.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/string.h>
19#include <linux/ctype.h>
20#include <linux/delay.h>
21#include <linux/utsname.h>
22#include <linux/ioport.h>
23#include <linux/init.h>
24#include <linux/smp_lock.h>
25#include <linux/initrd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <linux/bootmem.h>
27#include <linux/tty.h>
28#include <linux/gfp.h>
29#include <linux/percpu.h>
30#include <linux/kmod.h>
Nick Piggindb64fe02008-10-18 20:27:03 -070031#include <linux/vmalloc.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include <linux/kernel_stat.h>
Rusty Russelld7cd5612006-12-07 02:14:08 +010033#include <linux/start_kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <linux/security.h>
Jens Axboe3d442232008-06-26 11:21:34 +020035#include <linux/smp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <linux/workqueue.h>
37#include <linux/profile.h>
38#include <linux/rcupdate.h>
39#include <linux/moduleparam.h>
40#include <linux/kallsyms.h>
41#include <linux/writeback.h>
42#include <linux/cpu.h>
43#include <linux/cpuset.h>
Paul Menageddbcc7e2007-10-18 23:39:30 -070044#include <linux/cgroup.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include <linux/efi.h>
Thomas Gleixner906568c2007-02-16 01:28:01 -080046#include <linux/tick.h>
Andrew Morton6168a702007-02-17 21:22:39 -080047#include <linux/interrupt.h>
Shailabh Nagarc7572492006-07-14 00:24:40 -070048#include <linux/taskstats_kern.h>
Shailabh Nagarca74e922006-07-14 00:24:36 -070049#include <linux/delayacct.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#include <linux/unistd.h>
51#include <linux/rmap.h>
52#include <linux/mempolicy.h>
53#include <linux/key.h>
Adrian Bunkb6cd0b72006-06-27 02:53:54 -070054#include <linux/buffer_head.h>
KAMEZAWA Hiroyuki94b6da52008-10-22 14:15:05 -070055#include <linux/page_cgroup.h>
Ingo Molnar9a11b49a2006-07-03 00:24:33 -070056#include <linux/debug_locks.h>
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -070057#include <linux/debugobjects.h>
Ingo Molnarfbb9ce92006-07-03 00:24:50 -070058#include <linux/lockdep.h>
Catalin Marinas3c7b4e62009-06-11 13:22:39 +010059#include <linux/kmemleak.h>
Sukadev Bhattiprolu84d73782006-12-08 02:38:01 -080060#include <linux/pid_namespace.h>
Adrian Bunk1f217822006-12-19 13:01:28 -080061#include <linux/device.h>
Eric W. Biederman73c27992007-05-09 02:34:32 -070062#include <linux/kthread.h>
Adrian Bunke6fe6642007-11-09 22:39:39 +010063#include <linux/sched.h>
Adrian Bunka1c9eea2008-02-06 01:36:44 -080064#include <linux/signal.h>
Akinobu Mita199f0ca2008-04-29 01:03:13 -070065#include <linux/idr.h>
Steven Rostedt68bf21a2008-08-14 15:45:08 -040066#include <linux/ftrace.h>
Arjan van de Ven22a9d642009-01-07 08:45:46 -080067#include <linux/async.h>
Zhaolei02af61b2009-04-10 14:26:18 +080068#include <linux/kmemtrace.h>
Frederic Weisbecker3f5ec132008-11-11 23:21:31 +010069#include <trace/boot.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070070
71#include <asm/io.h>
72#include <asm/bugs.h>
73#include <asm/setup.h>
Andi Kleena9401992005-07-28 21:15:30 -070074#include <asm/sections.h>
Arjan van de Ven37b73c82006-01-06 00:12:01 -080075#include <asm/cacheflush.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
Linus Torvalds1da177e2005-04-16 15:20:36 -070077#ifdef CONFIG_X86_LOCAL_APIC
78#include <asm/smp.h>
79#endif
80
Sam Ravnborgaae5f662007-02-26 16:45:41 +010081static int kernel_init(void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070082
83extern void init_IRQ(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -070084extern void fork_init(unsigned long);
85extern void mca_init(void);
86extern void sbus_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -070087extern void prio_tree_init(void);
88extern void radix_tree_init(void);
89extern void free_initmem(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -070090#ifdef CONFIG_ACPI
91extern void acpi_early_init(void);
92#else
93static inline void acpi_early_init(void) { }
94#endif
Arjan van de Ven37b73c82006-01-06 00:12:01 -080095#ifndef CONFIG_DEBUG_RODATA
96static inline void mark_rodata_ro(void) { }
97#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
99#ifdef CONFIG_TC
100extern void tc_init(void);
101#endif
102
Paul E. McKenneya6826042009-02-25 18:03:42 -0800103enum system_states system_state __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104EXPORT_SYMBOL(system_state);
105
106/*
107 * Boot command-line arguments
108 */
109#define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT
110#define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT
111
112extern void time_init(void);
113/* Default late time init is NULL. archs can override this later. */
Jan Beulichd2e31922009-01-06 14:41:10 -0800114void (*__initdata late_time_init)(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115extern void softirq_init(void);
116
Alon Bar-Lev30d7e0d2007-02-12 00:53:52 -0800117/* Untouched command line saved by arch-specific code. */
118char __initdata boot_command_line[COMMAND_LINE_SIZE];
119/* Untouched saved command line (eg. for /proc) */
120char *saved_command_line;
121/* Command line for parameter parsing */
122static char *static_command_line;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123
124static char *execute_command;
Olof Johanssonffdfc402005-09-06 15:17:19 -0700125static char *ramdisk_execute_command;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126
Jan Beulich8b3b2952007-07-15 23:41:07 -0700127#ifdef CONFIG_SMP
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128/* Setup configured maximum number of CPUs to activate */
Andi Kleenca74a6f2008-01-30 13:33:17 +0100129unsigned int __initdata setup_max_cpus = NR_CPUS;
Vivek Goyal7e962872006-09-27 01:50:44 -0700130
131/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 * Setup routine for controlling SMP activation
133 *
134 * Command-line option of "nosmp" or "maxcpus=0" will disable SMP
135 * activation entirely (the MPS table probe still happens, though).
136 *
137 * Command-line option of "maxcpus=<NUM>", where <NUM> is an integer
138 * greater than 0, limits the maximum number of CPUs activated in
139 * SMP mode to <NUM>.
140 */
Ingo Molnar65a4e572009-01-31 03:36:17 +0100141
142void __weak arch_disable_smp_support(void) { }
Len Brown61ec7562007-08-16 03:34:22 -0400143
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144static int __init nosmp(char *str)
145{
Andi Kleenca74a6f2008-01-30 13:33:17 +0100146 setup_max_cpus = 0;
Ingo Molnar65a4e572009-01-31 03:36:17 +0100147 arch_disable_smp_support();
148
Jan Beulich8b3b2952007-07-15 23:41:07 -0700149 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150}
151
Jan Beulich8b3b2952007-07-15 23:41:07 -0700152early_param("nosmp", nosmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
154static int __init maxcpus(char *str)
155{
Andi Kleenca74a6f2008-01-30 13:33:17 +0100156 get_option(&str, &setup_max_cpus);
157 if (setup_max_cpus == 0)
Ingo Molnar65a4e572009-01-31 03:36:17 +0100158 arch_disable_smp_support();
Len Brown61ec7562007-08-16 03:34:22 -0400159
160 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161}
162
Hugh Dickins81340972007-08-27 16:02:12 +0100163early_param("maxcpus", maxcpus);
Jan Beulich8b3b2952007-07-15 23:41:07 -0700164#else
Ingo Molnar65a4e572009-01-31 03:36:17 +0100165const unsigned int setup_max_cpus = NR_CPUS;
Jan Beulich8b3b2952007-07-15 23:41:07 -0700166#endif
167
168/*
169 * If set, this is an indication to the drivers that reset the underlying
170 * device before going ahead with the initialization otherwise driver might
171 * rely on the BIOS and skip the reset operation.
172 *
173 * This is useful if kernel is booting in an unreliable environment.
174 * For ex. kdump situaiton where previous kernel has crashed, BIOS has been
175 * skipped and devices will be in unknown state.
176 */
177unsigned int reset_devices;
178EXPORT_SYMBOL(reset_devices);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
Vivek Goyal7e962872006-09-27 01:50:44 -0700180static int __init set_reset_devices(char *str)
181{
182 reset_devices = 1;
183 return 1;
184}
185
186__setup("reset_devices", set_reset_devices);
187
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188static char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
189char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };
190static const char *panic_later, *panic_param;
191
192extern struct obs_kernel_param __setup_start[], __setup_end[];
193
194static int __init obsolete_checksetup(char *line)
195{
196 struct obs_kernel_param *p;
Rusty Russell33df0d12006-09-26 10:52:32 +0200197 int had_early_param = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198
199 p = __setup_start;
200 do {
201 int n = strlen(p->str);
202 if (!strncmp(line, p->str, n)) {
203 if (p->early) {
Rusty Russell33df0d12006-09-26 10:52:32 +0200204 /* Already done in parse_early_param?
205 * (Needs exact match on param part).
206 * Keep iterating, as we can have early
207 * params and __setups of same names 8( */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 if (line[n] == '\0' || line[n] == '=')
Rusty Russell33df0d12006-09-26 10:52:32 +0200209 had_early_param = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 } else if (!p->setup_func) {
211 printk(KERN_WARNING "Parameter %s is obsolete,"
212 " ignored\n", p->str);
213 return 1;
214 } else if (p->setup_func(line + n))
215 return 1;
216 }
217 p++;
218 } while (p < __setup_end);
Rusty Russell33df0d12006-09-26 10:52:32 +0200219
220 return had_early_param;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221}
222
223/*
224 * This should be approx 2 Bo*oMips to start (note initial shift), and will
225 * still work even if initially too large, it will just take slightly longer
226 */
227unsigned long loops_per_jiffy = (1<<12);
228
229EXPORT_SYMBOL(loops_per_jiffy);
230
231static int __init debug_kernel(char *str)
232{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 console_loglevel = 10;
Yinghai Luf6f21c812008-02-08 04:21:58 -0800234 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235}
236
237static int __init quiet_kernel(char *str)
238{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 console_loglevel = 4;
Yinghai Luf6f21c812008-02-08 04:21:58 -0800240 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241}
242
Yinghai Luf6f21c812008-02-08 04:21:58 -0800243early_param("debug", debug_kernel);
244early_param("quiet", quiet_kernel);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245
246static int __init loglevel(char *str)
247{
248 get_option(&str, &console_loglevel);
Alex Riesend9d4fcf2008-03-04 14:28:31 -0800249 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250}
251
Yinghai Luf6f21c812008-02-08 04:21:58 -0800252early_param("loglevel", loglevel);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253
254/*
255 * Unknown boot options get handed to init, unless they look like
256 * failed parameters
257 */
258static int __init unknown_bootoption(char *param, char *val)
259{
260 /* Change NUL term back to "=", to make "param" the whole string. */
261 if (val) {
262 /* param=val or param="val"? */
263 if (val == param+strlen(param)+1)
264 val[-1] = '=';
265 else if (val == param+strlen(param)+2) {
266 val[-2] = '=';
267 memmove(val-1, val, strlen(val)+1);
268 val--;
269 } else
270 BUG();
271 }
272
273 /* Handle obsolete-style parameters */
274 if (obsolete_checksetup(param))
275 return 0;
276
277 /*
Simon Arlott211fee82007-10-20 01:28:29 +0200278 * Preemptive maintenance for "why didn't my misspelled command
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 * line work?"
280 */
281 if (strchr(param, '.') && (!val || strchr(param, '.') < val)) {
282 printk(KERN_ERR "Unknown boot option `%s': ignoring\n", param);
283 return 0;
284 }
285
286 if (panic_later)
287 return 0;
288
289 if (val) {
290 /* Environment option */
291 unsigned int i;
292 for (i = 0; envp_init[i]; i++) {
293 if (i == MAX_INIT_ENVS) {
294 panic_later = "Too many boot env vars at `%s'";
295 panic_param = param;
296 }
297 if (!strncmp(param, envp_init[i], val - param))
298 break;
299 }
300 envp_init[i] = param;
301 } else {
302 /* Command line option */
303 unsigned int i;
304 for (i = 0; argv_init[i]; i++) {
305 if (i == MAX_INIT_ARGS) {
306 panic_later = "Too many boot init vars at `%s'";
307 panic_param = param;
308 }
309 }
310 argv_init[i] = param;
311 }
312 return 0;
313}
314
Ingo Molnar12d6f212008-01-30 13:33:58 +0100315#ifdef CONFIG_DEBUG_PAGEALLOC
316int __read_mostly debug_pagealloc_enabled = 0;
317#endif
318
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319static int __init init_setup(char *str)
320{
321 unsigned int i;
322
323 execute_command = str;
324 /*
325 * In case LILO is going to boot us with default command line,
326 * it prepends "auto" before the whole cmdline which makes
327 * the shell think it should execute a script with such name.
328 * So we ignore all arguments entered _before_ init=... [MJ]
329 */
330 for (i = 1; i < MAX_INIT_ARGS; i++)
331 argv_init[i] = NULL;
332 return 1;
333}
334__setup("init=", init_setup);
335
Olof Johanssonffdfc402005-09-06 15:17:19 -0700336static int __init rdinit_setup(char *str)
337{
338 unsigned int i;
339
340 ramdisk_execute_command = str;
341 /* See "auto" comment in init_setup */
342 for (i = 1; i < MAX_INIT_ARGS; i++)
343 argv_init[i] = NULL;
344 return 1;
345}
346__setup("rdinit=", rdinit_setup);
347
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348#ifndef CONFIG_SMP
349
350#ifdef CONFIG_X86_LOCAL_APIC
351static void __init smp_init(void)
352{
353 APIC_init_uniprocessor();
354}
355#else
356#define smp_init() do { } while (0)
357#endif
358
359static inline void setup_per_cpu_areas(void) { }
Mike Travise0982e92008-03-26 14:23:48 -0700360static inline void setup_nr_cpu_ids(void) { }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361static inline void smp_prepare_cpus(unsigned int maxcpus) { }
362
363#else
364
Mike Travis321a8e92008-04-04 18:11:02 -0700365#if NR_CPUS > BITS_PER_LONG
366cpumask_t cpu_mask_all __read_mostly = CPU_MASK_ALL;
367EXPORT_SYMBOL(cpu_mask_all);
368#endif
369
Mike Travise0982e92008-03-26 14:23:48 -0700370/* Setup number of possible processor ids */
371int nr_cpu_ids __read_mostly = NR_CPUS;
372EXPORT_SYMBOL(nr_cpu_ids);
373
374/* An arch may set nr_cpu_ids earlier if needed, so this would be redundant */
375static void __init setup_nr_cpu_ids(void)
376{
Rusty Russelle0c0ba72009-01-01 10:12:19 +1030377 nr_cpu_ids = find_last_bit(cpumask_bits(cpu_possible_mask),NR_CPUS) + 1;
Mike Travise0982e92008-03-26 14:23:48 -0700378}
379
Mike Travisdd5af902008-01-30 13:33:32 +0100380#ifndef CONFIG_HAVE_SETUP_PER_CPU_AREA
Eric Dumazetb73b4592006-03-23 03:01:07 -0800381unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382
383EXPORT_SYMBOL(__per_cpu_offset);
384
385static void __init setup_per_cpu_areas(void)
386{
387 unsigned long size, i;
388 char *ptr;
Eric Dumazet63872f82006-03-23 03:01:04 -0800389 unsigned long nr_possible_cpus = num_possible_cpus();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390
391 /* Copy section for each CPU (we discard the original) */
Jeremy Fitzhardingeb6e35902007-05-02 19:27:12 +0200392 size = ALIGN(PERCPU_ENOUGH_ROOM, PAGE_SIZE);
393 ptr = alloc_bootmem_pages(size * nr_possible_cpus);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394
KAMEZAWA Hiroyuki0a945022006-03-28 01:56:37 -0800395 for_each_possible_cpu(i) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 __per_cpu_offset[i] = ptr - __per_cpu_start;
397 memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
Eric Dumazet63872f82006-03-23 03:01:04 -0800398 ptr += size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 }
400}
Mike Travisdd5af902008-01-30 13:33:32 +0100401#endif /* CONFIG_HAVE_SETUP_PER_CPU_AREA */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402
403/* Called by boot processor to activate the rest. */
404static void __init smp_init(void)
405{
Christoph Lameter53b8a312007-02-20 13:57:51 -0800406 unsigned int cpu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407
Max Krasnyanskye761b772008-07-15 04:43:49 -0700408 /*
409 * Set up the current CPU as possible to migrate to.
410 * The other ones will be done by cpu_up/cpu_down()
411 */
Rusty Russell2b17fa52009-03-30 22:05:12 -0600412 set_cpu_active(smp_processor_id(), true);
Max Krasnyanskye761b772008-07-15 04:43:49 -0700413
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 /* FIXME: This should be done in userspace --RR */
Christoph Lameter53b8a312007-02-20 13:57:51 -0800415 for_each_present_cpu(cpu) {
Andi Kleenca74a6f2008-01-30 13:33:17 +0100416 if (num_online_cpus() >= setup_max_cpus)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 break;
Christoph Lameter53b8a312007-02-20 13:57:51 -0800418 if (!cpu_online(cpu))
419 cpu_up(cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 }
421
422 /* Any cleanup work */
423 printk(KERN_INFO "Brought up %ld CPUs\n", (long)num_online_cpus());
Andi Kleenca74a6f2008-01-30 13:33:17 +0100424 smp_cpus_done(setup_max_cpus);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425}
426
427#endif
428
429/*
Alon Bar-Lev30d7e0d2007-02-12 00:53:52 -0800430 * We need to store the untouched command line for future reference.
431 * We also need to store the touched command line since the parameter
432 * parsing is performed in place, and we should allow a component to
433 * store reference of name/value for future reference.
434 */
435static void __init setup_command_line(char *command_line)
436{
437 saved_command_line = alloc_bootmem(strlen (boot_command_line)+1);
438 static_command_line = alloc_bootmem(strlen (command_line)+1);
439 strcpy (saved_command_line, boot_command_line);
440 strcpy (static_command_line, command_line);
441}
442
443/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 * We need to finalize in a non-__init function or else race conditions
445 * between the root thread and the init thread may cause start_kernel to
446 * be reaped by free_initmem before the root thread has proceeded to
447 * cpu_idle.
448 *
449 * gcc-3.4 accidentally inlines this function, so use noinline.
450 */
451
Rakib Mullickf99ebf02009-01-06 14:40:38 -0800452static noinline void __init_refok rest_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 __releases(kernel_lock)
454{
Eric W. Biederman73c27992007-05-09 02:34:32 -0700455 int pid;
456
Sam Ravnborgaae5f662007-02-26 16:45:41 +0100457 kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 numa_default_policy();
Eric W. Biederman73c27992007-05-09 02:34:32 -0700459 pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES);
Pavel Emelyanov5cd20452008-04-30 00:54:24 -0700460 kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 unlock_kernel();
Ingo Molnarf340c0d2005-06-28 16:40:42 +0200462
463 /*
464 * The boot idle thread must execute schedule()
Ingo Molnar1df21052007-07-09 18:51:58 +0200465 * at least once to get things moving:
Ingo Molnarf340c0d2005-06-28 16:40:42 +0200466 */
Ingo Molnar1df21052007-07-09 18:51:58 +0200467 init_idle_bootup_task(current);
Paul E. McKenneya6826042009-02-25 18:03:42 -0800468 rcu_scheduler_starting();
Nick Piggin5bfb5d62005-11-08 21:39:01 -0800469 preempt_enable_no_resched();
Ingo Molnarf340c0d2005-06-28 16:40:42 +0200470 schedule();
Nick Piggin5bfb5d62005-11-08 21:39:01 -0800471 preempt_disable();
Ingo Molnarf340c0d2005-06-28 16:40:42 +0200472
Nick Piggin5bfb5d62005-11-08 21:39:01 -0800473 /* Call into cpu_idle with preempt disabled */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 cpu_idle();
Ingo Molnar1df21052007-07-09 18:51:58 +0200475}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476
477/* Check for early params. */
478static int __init do_early_param(char *param, char *val)
479{
480 struct obs_kernel_param *p;
481
482 for (p = __setup_start; p < __setup_end; p++) {
Yinghai Lu18a8bd92007-07-15 23:37:59 -0700483 if ((p->early && strcmp(param, p->str) == 0) ||
484 (strcmp(param, "console") == 0 &&
485 strcmp(p->str, "earlycon") == 0)
486 ) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 if (p->setup_func(val) != 0)
488 printk(KERN_WARNING
489 "Malformed early option '%s'\n", param);
490 }
491 }
492 /* We accept everything at this stage. */
493 return 0;
494}
495
Magnus Damm13977092009-03-30 14:37:25 -0700496void __init parse_early_options(char *cmdline)
497{
498 parse_args("early options", cmdline, NULL, 0, do_early_param);
499}
500
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501/* Arch code calls this early on, or if not, just before other parsing. */
502void __init parse_early_param(void)
503{
504 static __initdata int done = 0;
505 static __initdata char tmp_cmdline[COMMAND_LINE_SIZE];
506
507 if (done)
508 return;
509
510 /* All fall through to do_early_param. */
Alon Bar-Lev30d7e0d2007-02-12 00:53:52 -0800511 strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
Magnus Damm13977092009-03-30 14:37:25 -0700512 parse_early_options(tmp_cmdline);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 done = 1;
514}
515
516/*
517 * Activate the first processor.
518 */
519
Stas Sergeev44fd2292006-03-23 02:59:44 -0800520static void __init boot_cpu_init(void)
521{
522 int cpu = smp_processor_id();
523 /* Mark the boot cpu "present", "online" etc for SMP and UP case */
Rusty Russell915441b2009-01-01 10:12:15 +1030524 set_cpu_online(cpu, true);
525 set_cpu_present(cpu, true);
526 set_cpu_possible(cpu, true);
Stas Sergeev44fd2292006-03-23 02:59:44 -0800527}
528
Benjamin Herrenschmidt839ad622008-04-18 16:56:18 +1000529void __init __weak smp_setup_processor_id(void)
Andrew Morton033ab7f2006-06-30 01:55:50 -0700530{
531}
532
Benjamin Herrenschmidt8c9843e2008-04-18 16:56:15 +1000533void __init __weak thread_info_cache_init(void)
534{
535}
536
Pekka Enberg444f4782009-06-11 18:29:06 +0300537/*
538 * Set up kernel memory allocators
539 */
540static void __init mm_init(void)
541{
KAMEZAWA Hiroyukica371c02009-06-12 10:33:53 +0300542 /*
543 * page_cgroup requires countinous pages as memmap
544 * and it's bigger than MAX_ORDER unless SPARSEMEM.
545 */
546 page_cgroup_init_flatmem();
Pekka Enberg444f4782009-06-11 18:29:06 +0300547 mem_init();
548 kmem_cache_init();
549 vmalloc_init();
550}
551
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552asmlinkage void __init start_kernel(void)
553{
554 char * command_line;
555 extern struct kernel_param __start___param[], __stop___param[];
Andrew Morton033ab7f2006-06-30 01:55:50 -0700556
557 smp_setup_processor_id();
558
Ingo Molnarfbb9ce92006-07-03 00:24:50 -0700559 /*
560 * Need to run as early as possible, to initialize the
561 * lockdep hash:
562 */
563 lockdep_init();
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700564 debug_objects_early_init();
Ingo Molnar42059422008-02-14 09:44:08 +0100565
566 /*
567 * Set up the the initial canary ASAP:
568 */
569 boot_init_stack_canary();
570
Paul Menageddbcc7e2007-10-18 23:39:30 -0700571 cgroup_init_early();
Ingo Molnarfbb9ce92006-07-03 00:24:50 -0700572
573 local_irq_disable();
574 early_boot_irqs_off();
Ingo Molnar243c7622006-07-03 00:25:06 -0700575 early_init_irq_lock_class();
Ingo Molnarfbb9ce92006-07-03 00:24:50 -0700576
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577/*
578 * Interrupts are still disabled. Do necessary setups, then
579 * enable them
580 */
581 lock_kernel();
Thomas Gleixner906568c2007-02-16 01:28:01 -0800582 tick_init();
Stas Sergeev44fd2292006-03-23 02:59:44 -0800583 boot_cpu_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 page_address_init();
Alex Riesen657cafa2009-05-24 15:30:48 +0200585 printk(KERN_NOTICE "%s", linux_banner);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 setup_arch(&command_line);
Balbir Singhcf475ad2008-04-29 01:00:16 -0700587 mm_init_owner(&init_mm, &init_task);
Alon Bar-Lev30d7e0d2007-02-12 00:53:52 -0800588 setup_command_line(command_line);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 setup_per_cpu_areas();
Mike Travise0982e92008-03-26 14:23:48 -0700590 setup_nr_cpu_ids();
Stas Sergeev44fd2292006-03-23 02:59:44 -0800591 smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592
Pekka Enberg83b519e2009-06-10 19:40:04 +0300593 build_all_zonelists();
594 page_alloc_init();
595
596 printk(KERN_NOTICE "Kernel command line: %s\n", boot_command_line);
597 parse_early_param();
598 parse_args("Booting kernel", static_command_line, __start___param,
599 __stop___param - __start___param,
600 &unknown_bootoption);
601 /*
602 * These use large bootmem allocations and must precede
603 * kmem_cache_init()
604 */
605 pidhash_init();
Pekka Enberg83b519e2009-06-10 19:40:04 +0300606 vfs_caches_init_early();
607 sort_main_extable();
608 trap_init();
Pekka Enberg444f4782009-06-11 18:29:06 +0300609 mm_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 /*
611 * Set up the scheduler prior starting any interrupts (such as the
612 * timer interrupt). Full topology setup happens at smp_init()
613 * time - but meanwhile we still have a functioning scheduler.
614 */
615 sched_init();
616 /*
617 * Disable preemption - early bootup scheduling is extremely
618 * fragile until we cpu_idle() for the first time.
619 */
620 preempt_disable();
Ard van Breemenc4a68302007-01-05 16:36:19 -0800621 if (!irqs_disabled()) {
622 printk(KERN_WARNING "start_kernel(): bug: interrupts were "
623 "enabled *very* early, fixing it\n");
624 local_irq_disable();
625 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 rcu_init();
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800627 /* init some links before init_ISA_irqs() */
628 early_irq_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629 init_IRQ();
Catalin Marinas3c7b4e62009-06-11 13:22:39 +0100630 prio_tree_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631 init_timers();
Thomas Gleixnerc0a31322006-01-09 20:52:32 -0800632 hrtimers_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 softirq_init();
john stultzad596172006-06-26 00:25:06 -0700634 timekeeping_init();
john stultz88fecaa2006-07-03 00:24:04 -0700635 time_init();
Peter Zijlstra3e51f332008-05-03 18:29:28 +0200636 sched_clock_init();
Heiko Carstens93e02812006-07-03 00:24:24 -0700637 profile_init();
638 if (!irqs_disabled())
Ron Lee24d431d2008-11-27 02:31:57 +1030639 printk(KERN_CRIT "start_kernel(): bug: interrupts were "
640 "enabled early\n");
Ingo Molnarfbb9ce92006-07-03 00:24:50 -0700641 early_boot_irqs_on();
Heiko Carstens93e02812006-07-03 00:24:24 -0700642 local_irq_enable();
Pekka Enberg7e85ee02009-06-12 14:03:06 +0300643 kmem_cache_init_late();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644
645 /*
646 * HACK ALERT! This is early. We're enabling the console before
647 * we've done PCI setups etc, and console_init() must be aware of
648 * this. But we do want output early, in case something goes wrong.
649 */
650 console_init();
651 if (panic_later)
652 panic(panic_later, panic_param);
Ingo Molnarfbb9ce92006-07-03 00:24:50 -0700653
654 lockdep_info();
655
Ingo Molnar9a11b49a2006-07-03 00:24:33 -0700656 /*
657 * Need to run this when irqs are enabled, because it wants
658 * to self-test [hard/soft]-irqs on/off lock inversion bugs
659 * too:
660 */
661 locking_selftest();
662
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663#ifdef CONFIG_BLK_DEV_INITRD
664 if (initrd_start && !initrd_below_start_ok &&
Geert Uytterhoevenbd673c72008-07-29 22:33:36 -0700665 page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 printk(KERN_CRIT "initrd overwritten (0x%08lx < 0x%08lx) - "
Geert Uytterhoevenfb6624e2008-07-17 21:16:36 +0200667 "disabling it.\n",
Geert Uytterhoevenbd673c72008-07-29 22:33:36 -0700668 page_to_pfn(virt_to_page((void *)initrd_start)),
669 min_low_pfn);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670 initrd_start = 0;
671 }
672#endif
Paul Jacksonc417f022006-01-08 01:02:01 -0800673 cpuset_init_early();
KAMEZAWA Hiroyuki94b6da52008-10-22 14:15:05 -0700674 page_cgroup_init();
Thomas Gleixnera03c2a42008-02-09 23:24:09 +0100675 enable_debug_pagealloc();
Gautham R Shenoyd2219382008-01-25 21:08:01 +0100676 cpu_hotplug_init();
Eduard - Gabriel Munteanub9ce08c2008-08-10 20:14:03 +0300677 kmemtrace_init();
Catalin Marinas3c7b4e62009-06-11 13:22:39 +0100678 kmemleak_init();
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700679 debug_objects_mem_init();
Akinobu Mita199f0ca2008-04-29 01:03:13 -0700680 idr_init_cache();
Christoph Lametere7c8d5c2005-06-21 17:14:47 -0700681 setup_per_cpu_pageset();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 numa_policy_init();
683 if (late_time_init)
684 late_time_init();
685 calibrate_delay();
686 pidmap_init();
687 pgtable_cache_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688 anon_vma_init();
689#ifdef CONFIG_X86
690 if (efi_enabled)
691 efi_enter_virtual_mode();
692#endif
Benjamin Herrenschmidt8c9843e2008-04-18 16:56:15 +1000693 thread_info_cache_init();
David Howellsd84f4f92008-11-14 10:39:23 +1100694 cred_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695 fork_init(num_physpages);
696 proc_caches_init();
697 buffer_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 key_init();
699 security_init();
700 vfs_caches_init(num_physpages);
701 radix_tree_init();
702 signals_init();
703 /* rootfs populating might need page-writeback */
704 page_writeback_init();
705#ifdef CONFIG_PROC_FS
706 proc_root_init();
707#endif
Paul Menageddbcc7e2007-10-18 23:39:30 -0700708 cgroup_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 cpuset_init();
Shailabh Nagarc7572492006-07-14 00:24:40 -0700710 taskstats_init_early();
Shailabh Nagarca74e922006-07-14 00:24:36 -0700711 delayacct_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712
713 check_bugs();
714
715 acpi_early_init(); /* before LAPIC and SMP init */
716
Steven Rostedt68bf21a2008-08-14 15:45:08 -0400717 ftrace_init();
718
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 /* Do the rest non-__init'ed, we're now alive */
720 rest_init();
721}
722
Arjan van de Ven22a9d642009-01-07 08:45:46 -0800723int initcall_debug;
Rusty Russelld0ea3d72008-10-22 10:00:23 -0500724core_param(initcall_debug, initcall_debug, bool, 0644);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725
Arjan van de Ven59f94152008-07-30 12:49:02 -0700726int do_one_initcall(initcall_t fn)
Linus Torvaldse0df1542008-05-15 18:14:01 -0700727{
728 int count = preempt_count();
Frederic Weisbecker74239072008-11-11 23:24:42 +0100729 ktime_t calltime, delta, rettime;
Cyrill Gorcunova76bfd02008-05-15 13:52:41 -0700730 char msgbuf[64];
Frederic Weisbecker74239072008-11-11 23:24:42 +0100731 struct boot_trace_call call;
732 struct boot_trace_ret ret;
Linus Torvaldse0df1542008-05-15 18:14:01 -0700733
734 if (initcall_debug) {
Frederic Weisbecker74239072008-11-11 23:24:42 +0100735 call.caller = task_pid_nr(current);
736 printk("calling %pF @ %i\n", fn, call.caller);
737 calltime = ktime_get();
738 trace_boot_call(&call, fn);
Frederic Weisbecker71566a02008-10-31 12:57:20 +0100739 enable_boot_trace();
Linus Torvaldse0df1542008-05-15 18:14:01 -0700740 }
741
Frederic Weisbecker74239072008-11-11 23:24:42 +0100742 ret.result = fn();
Linus Torvaldse0df1542008-05-15 18:14:01 -0700743
744 if (initcall_debug) {
Frederic Weisbecker71566a02008-10-31 12:57:20 +0100745 disable_boot_trace();
Frederic Weisbecker74239072008-11-11 23:24:42 +0100746 rettime = ktime_get();
747 delta = ktime_sub(rettime, calltime);
Will Newton1d926f22008-11-21 14:08:59 -0800748 ret.duration = (unsigned long long) ktime_to_ns(delta) >> 10;
Frederic Weisbecker74239072008-11-11 23:24:42 +0100749 trace_boot_ret(&ret, fn);
Tim Birdca538f62008-10-09 15:23:05 -0700750 printk("initcall %pF returned %d after %Ld usecs\n", fn,
Frederic Weisbecker74239072008-11-11 23:24:42 +0100751 ret.result, ret.duration);
Linus Torvaldse0df1542008-05-15 18:14:01 -0700752 }
753
754 msgbuf[0] = 0;
755
Frederic Weisbecker74239072008-11-11 23:24:42 +0100756 if (ret.result && ret.result != -ENODEV && initcall_debug)
757 sprintf(msgbuf, "error code %d ", ret.result);
Linus Torvaldse0df1542008-05-15 18:14:01 -0700758
759 if (preempt_count() != count) {
Cyrill Gorcunova76bfd02008-05-15 13:52:41 -0700760 strlcat(msgbuf, "preemption imbalance ", sizeof(msgbuf));
Linus Torvaldse0df1542008-05-15 18:14:01 -0700761 preempt_count() = count;
762 }
763 if (irqs_disabled()) {
Cyrill Gorcunova76bfd02008-05-15 13:52:41 -0700764 strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf));
Linus Torvaldse0df1542008-05-15 18:14:01 -0700765 local_irq_enable();
766 }
767 if (msgbuf[0]) {
Linus Torvalds96d746c2008-10-03 13:38:07 -0700768 printk("initcall %pF returned with %s\n", fn, msgbuf);
Linus Torvaldse0df1542008-05-15 18:14:01 -0700769 }
Arjan van de Ven59f94152008-07-30 12:49:02 -0700770
Frederic Weisbecker74239072008-11-11 23:24:42 +0100771 return ret.result;
Linus Torvaldse0df1542008-05-15 18:14:01 -0700772}
773
774
Eduard - Gabriel Munteanuc2147a52008-07-25 19:45:11 -0700775extern initcall_t __initcall_start[], __initcall_end[], __early_initcall_end[];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776
777static void __init do_initcalls(void)
778{
779 initcall_t *call;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780
Eduard - Gabriel Munteanuc2147a52008-07-25 19:45:11 -0700781 for (call = __early_initcall_end; call < __initcall_end; call++)
Linus Torvaldse0df1542008-05-15 18:14:01 -0700782 do_one_initcall(*call);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783
784 /* Make sure there is no pending stuff from the initcall sequence */
785 flush_scheduled_work();
786}
787
788/*
789 * Ok, the machine is now initialized. None of the devices
790 * have been touched yet, but the CPU subsystem is up and
791 * running, and memory and process management works.
792 *
793 * Now we can finally start doing some real work..
794 */
795static void __init do_basic_setup(void)
796{
Paul E. McKenney4446a362008-05-12 21:21:05 +0200797 rcu_init_sched(); /* needed by module_init stage. */
Linus Torvalds4403b402008-10-25 19:53:38 -0700798 init_workqueues();
Lai Jiangshan759ee092009-03-25 17:06:30 +0800799 cpuset_init_smp();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 usermodehelper_init();
801 driver_init();
Eric W. Biedermanb04c3af2007-02-14 00:33:57 -0800802 init_irq_proc();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803 do_initcalls();
804}
805
Eduard - Gabriel Munteanu7babe8d2008-07-25 19:45:11 -0700806static void __init do_pre_smp_initcalls(void)
Eduard - Gabriel Munteanuc2147a52008-07-25 19:45:11 -0700807{
808 initcall_t *call;
809
810 for (call = __initcall_start; call < __early_initcall_end; call++)
811 do_one_initcall(*call);
812}
813
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814static void run_init_process(char *init_filename)
815{
816 argv_init[0] = init_filename;
Arnd Bergmann67608562006-10-02 02:18:26 -0700817 kernel_execve(init_filename, argv_init, envp_init);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818}
819
Vivek Goyalee5bfa62007-02-13 13:26:22 +0100820/* This is a non __init function. Force it to be noinline otherwise gcc
821 * makes it inline to init() and it becomes part of init.text section
822 */
Rakib Mullickf99ebf02009-01-06 14:40:38 -0800823static noinline int init_post(void)
Hannes Ederacdd0522009-03-31 15:23:50 -0700824 __releases(kernel_lock)
Vivek Goyalee5bfa62007-02-13 13:26:22 +0100825{
Arjan van de Ven22a9d642009-01-07 08:45:46 -0800826 /* need to finish all async __init code before freeing the memory */
827 async_synchronize_full();
Vivek Goyalee5bfa62007-02-13 13:26:22 +0100828 free_initmem();
829 unlock_kernel();
830 mark_rodata_ro();
831 system_state = SYSTEM_RUNNING;
832 numa_default_policy();
833
834 if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
835 printk(KERN_WARNING "Warning: unable to open an initial console.\n");
836
837 (void) sys_dup(0);
838 (void) sys_dup(0);
839
Oleg Nesterovfae5fa42008-04-30 00:53:03 -0700840 current->signal->flags |= SIGNAL_UNKILLABLE;
841
Vivek Goyalee5bfa62007-02-13 13:26:22 +0100842 if (ramdisk_execute_command) {
843 run_init_process(ramdisk_execute_command);
844 printk(KERN_WARNING "Failed to execute %s\n",
845 ramdisk_execute_command);
846 }
847
848 /*
849 * We try each of these until one succeeds.
850 *
851 * The Bourne shell can be used instead of init if we are
852 * trying to recover a really broken machine.
853 */
854 if (execute_command) {
855 run_init_process(execute_command);
856 printk(KERN_WARNING "Failed to execute %s. Attempting "
857 "defaults...\n", execute_command);
858 }
859 run_init_process("/sbin/init");
860 run_init_process("/etc/init");
861 run_init_process("/bin/init");
862 run_init_process("/bin/sh");
863
864 panic("No init found. Try passing init= option to kernel.");
865}
866
Sam Ravnborgaae5f662007-02-26 16:45:41 +0100867static int __init kernel_init(void * unused)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868{
869 lock_kernel();
870 /*
871 * init can run on any cpu.
872 */
Rusty Russell1a2142a2009-03-30 22:05:10 -0600873 set_cpus_allowed_ptr(current, cpu_all_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 /*
875 * Tell the world that we're going to be the grim
876 * reaper of innocent orphaned children.
877 *
878 * We don't want people to have to make incorrect
879 * assumptions about where in the task array this
880 * can be found.
881 */
Sukadev Bhattiprolu84d73782006-12-08 02:38:01 -0800882 init_pid_ns.child_reaper = current;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883
Cedric Le Goater9ec52092006-10-02 02:19:00 -0700884 cad_pid = task_pid(current);
885
Andi Kleenca74a6f2008-01-30 13:33:17 +0100886 smp_prepare_cpus(setup_max_cpus);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887
888 do_pre_smp_initcalls();
Frédéric Weisbecker3bf77af2008-09-23 11:38:18 +0100889 start_boot_trace();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 smp_init();
892 sched_init_smp();
893
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894 do_basic_setup();
895
896 /*
897 * check if there is an early userspace init. If yes, let it do all
898 * the work
899 */
Olof Johanssonffdfc402005-09-06 15:17:19 -0700900
901 if (!ramdisk_execute_command)
902 ramdisk_execute_command = "/init";
903
904 if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) {
905 ramdisk_execute_command = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906 prepare_namespace();
Olof Johanssonffdfc402005-09-06 15:17:19 -0700907 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908
909 /*
910 * Ok, we have completed the initial bootup, and
911 * we're essentially up and running. Get rid of the
912 * initmem segments and start the user-mode stuff..
913 */
Frederic Weisbecker71566a02008-10-31 12:57:20 +0100914
Vivek Goyalee5bfa62007-02-13 13:26:22 +0100915 init_post();
916 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917}