Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 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 | |
Andrew Morton | ea676e8 | 2013-04-29 16:18:20 -0700 | [diff] [blame] | 12 | #define DEBUG /* Enable initcall_debug */ |
| 13 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/types.h> |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/proc_fs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/kernel.h> |
| 18 | #include <linux/syscalls.h> |
Ingo Molnar | 9b5609f | 2008-02-14 09:41:09 +0100 | [diff] [blame] | 19 | #include <linux/stackprotector.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/string.h> |
| 21 | #include <linux/ctype.h> |
| 22 | #include <linux/delay.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/ioport.h> |
| 24 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/initrd.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/bootmem.h> |
Len Brown | 4a7a16d | 2009-06-12 20:42:08 -0400 | [diff] [blame] | 27 | #include <linux/acpi.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/tty.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <linux/percpu.h> |
| 30 | #include <linux/kmod.h> |
Nick Piggin | db64fe0 | 2008-10-18 20:27:03 -0700 | [diff] [blame] | 31 | #include <linux/vmalloc.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <linux/kernel_stat.h> |
Rusty Russell | d7cd561 | 2006-12-07 02:14:08 +0100 | [diff] [blame] | 33 | #include <linux/start_kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <linux/security.h> |
Jens Axboe | 3d44223 | 2008-06-26 11:21:34 +0200 | [diff] [blame] | 35 | #include <linux/smp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #include <linux/profile.h> |
| 37 | #include <linux/rcupdate.h> |
| 38 | #include <linux/moduleparam.h> |
| 39 | #include <linux/kallsyms.h> |
| 40 | #include <linux/writeback.h> |
| 41 | #include <linux/cpu.h> |
| 42 | #include <linux/cpuset.h> |
Paul Menage | ddbcc7e | 2007-10-18 23:39:30 -0700 | [diff] [blame] | 43 | #include <linux/cgroup.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #include <linux/efi.h> |
Thomas Gleixner | 906568c | 2007-02-16 01:28:01 -0800 | [diff] [blame] | 45 | #include <linux/tick.h> |
Andrew Morton | 6168a70 | 2007-02-17 21:22:39 -0800 | [diff] [blame] | 46 | #include <linux/interrupt.h> |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 47 | #include <linux/taskstats_kern.h> |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 48 | #include <linux/delayacct.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | #include <linux/unistd.h> |
| 50 | #include <linux/rmap.h> |
| 51 | #include <linux/mempolicy.h> |
| 52 | #include <linux/key.h> |
Adrian Bunk | b6cd0b7 | 2006-06-27 02:53:54 -0700 | [diff] [blame] | 53 | #include <linux/buffer_head.h> |
KAMEZAWA Hiroyuki | 94b6da5 | 2008-10-22 14:15:05 -0700 | [diff] [blame] | 54 | #include <linux/page_cgroup.h> |
Ingo Molnar | 9a11b49a | 2006-07-03 00:24:33 -0700 | [diff] [blame] | 55 | #include <linux/debug_locks.h> |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 56 | #include <linux/debugobjects.h> |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 57 | #include <linux/lockdep.h> |
Catalin Marinas | 3c7b4e6 | 2009-06-11 13:22:39 +0100 | [diff] [blame] | 58 | #include <linux/kmemleak.h> |
Sukadev Bhattiprolu | 84d7378 | 2006-12-08 02:38:01 -0800 | [diff] [blame] | 59 | #include <linux/pid_namespace.h> |
Adrian Bunk | 1f21782 | 2006-12-19 13:01:28 -0800 | [diff] [blame] | 60 | #include <linux/device.h> |
Eric W. Biederman | 73c2799 | 2007-05-09 02:34:32 -0700 | [diff] [blame] | 61 | #include <linux/kthread.h> |
Adrian Bunk | e6fe664 | 2007-11-09 22:39:39 +0100 | [diff] [blame] | 62 | #include <linux/sched.h> |
Adrian Bunk | a1c9eea | 2008-02-06 01:36:44 -0800 | [diff] [blame] | 63 | #include <linux/signal.h> |
Akinobu Mita | 199f0ca | 2008-04-29 01:03:13 -0700 | [diff] [blame] | 64 | #include <linux/idr.h> |
Jason Wessel | 0b4b382 | 2010-05-20 21:04:29 -0500 | [diff] [blame] | 65 | #include <linux/kgdb.h> |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 66 | #include <linux/ftrace.h> |
Arjan van de Ven | 22a9d64 | 2009-01-07 08:45:46 -0800 | [diff] [blame] | 67 | #include <linux/async.h> |
Vegard Nossum | dfec072 | 2008-04-04 00:51:41 +0200 | [diff] [blame] | 68 | #include <linux/kmemcheck.h> |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 69 | #include <linux/sfi.h> |
Kay Sievers | 2b2af54 | 2009-04-30 15:23:42 +0200 | [diff] [blame] | 70 | #include <linux/shmem_fs.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 71 | #include <linux/slab.h> |
Peter Zijlstra | 24a24bb | 2010-11-17 23:17:33 +0100 | [diff] [blame] | 72 | #include <linux/perf_event.h> |
Al Viro | 4a9d4b0 | 2012-06-24 09:56:45 +0400 | [diff] [blame] | 73 | #include <linux/file.h> |
Al Viro | a74fb73 | 2012-10-10 21:28:25 -0400 | [diff] [blame] | 74 | #include <linux/ptrace.h> |
Tejun Heo | bb813f4 | 2013-01-18 14:05:56 -0800 | [diff] [blame] | 75 | #include <linux/blkdev.h> |
| 76 | #include <linux/elevator.h> |
Stephen Boyd | 38ff87f | 2013-06-01 23:39:40 -0700 | [diff] [blame] | 77 | #include <linux/sched_clock.h> |
Frederic Weisbecker | 65f382f | 2013-07-11 19:12:32 +0200 | [diff] [blame] | 78 | #include <linux/context_tracking.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | |
| 80 | #include <asm/io.h> |
| 81 | #include <asm/bugs.h> |
| 82 | #include <asm/setup.h> |
Andi Kleen | a940199 | 2005-07-28 21:15:30 -0700 | [diff] [blame] | 83 | #include <asm/sections.h> |
Arjan van de Ven | 37b73c8 | 2006-01-06 00:12:01 -0800 | [diff] [blame] | 84 | #include <asm/cacheflush.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | #ifdef CONFIG_X86_LOCAL_APIC |
| 87 | #include <asm/smp.h> |
| 88 | #endif |
| 89 | |
Sam Ravnborg | aae5f66 | 2007-02-26 16:45:41 +0100 | [diff] [blame] | 90 | static int kernel_init(void *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | |
| 92 | extern void init_IRQ(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | extern void fork_init(unsigned long); |
| 94 | extern void mca_init(void); |
| 95 | extern void sbus_init(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | extern void radix_tree_init(void); |
Arjan van de Ven | 37b73c8 | 2006-01-06 00:12:01 -0800 | [diff] [blame] | 97 | #ifndef CONFIG_DEBUG_RODATA |
| 98 | static inline void mark_rodata_ro(void) { } |
| 99 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | |
| 101 | #ifdef CONFIG_TC |
| 102 | extern void tc_init(void); |
| 103 | #endif |
| 104 | |
Tejun Heo | 2ce802f | 2011-01-20 12:06:35 +0100 | [diff] [blame] | 105 | /* |
| 106 | * Debug helper: via this flag we know that we are in 'early bootup code' |
| 107 | * where only the boot processor is running with IRQ disabled. This means |
| 108 | * two things - IRQ must not be enabled before the flag is cleared and some |
| 109 | * operations which are not allowed with IRQ disabled are allowed while the |
| 110 | * flag is set. |
| 111 | */ |
| 112 | bool early_boot_irqs_disabled __read_mostly; |
| 113 | |
Paul E. McKenney | a682604 | 2009-02-25 18:03:42 -0800 | [diff] [blame] | 114 | enum system_states system_state __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | EXPORT_SYMBOL(system_state); |
| 116 | |
| 117 | /* |
| 118 | * Boot command-line arguments |
| 119 | */ |
| 120 | #define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT |
| 121 | #define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT |
| 122 | |
| 123 | extern void time_init(void); |
| 124 | /* Default late time init is NULL. archs can override this later. */ |
Jan Beulich | d2e3192 | 2009-01-06 14:41:10 -0800 | [diff] [blame] | 125 | void (*__initdata late_time_init)(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | extern void softirq_init(void); |
| 127 | |
Alon Bar-Lev | 30d7e0d | 2007-02-12 00:53:52 -0800 | [diff] [blame] | 128 | /* Untouched command line saved by arch-specific code. */ |
| 129 | char __initdata boot_command_line[COMMAND_LINE_SIZE]; |
| 130 | /* Untouched saved command line (eg. for /proc) */ |
| 131 | char *saved_command_line; |
| 132 | /* Command line for parameter parsing */ |
| 133 | static char *static_command_line; |
Krzysztof Mazur | 08746a6 | 2013-10-31 13:45:39 +1030 | [diff] [blame^] | 134 | /* Command line for per-initcall parameter parsing */ |
| 135 | static char *initcall_command_line; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | |
| 137 | static char *execute_command; |
Olof Johansson | ffdfc40 | 2005-09-06 15:17:19 -0700 | [diff] [blame] | 138 | static char *ramdisk_execute_command; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | |
Jan Beulich | 8b3b295 | 2007-07-15 23:41:07 -0700 | [diff] [blame] | 140 | /* |
| 141 | * If set, this is an indication to the drivers that reset the underlying |
| 142 | * device before going ahead with the initialization otherwise driver might |
| 143 | * rely on the BIOS and skip the reset operation. |
| 144 | * |
| 145 | * This is useful if kernel is booting in an unreliable environment. |
| 146 | * For ex. kdump situaiton where previous kernel has crashed, BIOS has been |
| 147 | * skipped and devices will be in unknown state. |
| 148 | */ |
| 149 | unsigned int reset_devices; |
| 150 | EXPORT_SYMBOL(reset_devices); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | |
Vivek Goyal | 7e96287 | 2006-09-27 01:50:44 -0700 | [diff] [blame] | 152 | static int __init set_reset_devices(char *str) |
| 153 | { |
| 154 | reset_devices = 1; |
| 155 | return 1; |
| 156 | } |
| 157 | |
| 158 | __setup("reset_devices", set_reset_devices); |
| 159 | |
David Howells | d762746 | 2010-08-17 23:52:56 +0100 | [diff] [blame] | 160 | static const char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; |
| 161 | const char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | static const char *panic_later, *panic_param; |
| 163 | |
Rusty Russell | 914dcaa | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 164 | extern const struct obs_kernel_param __setup_start[], __setup_end[]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | |
| 166 | static int __init obsolete_checksetup(char *line) |
| 167 | { |
Rusty Russell | 914dcaa | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 168 | const struct obs_kernel_param *p; |
Rusty Russell | 33df0d1 | 2006-09-26 10:52:32 +0200 | [diff] [blame] | 169 | int had_early_param = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | |
| 171 | p = __setup_start; |
| 172 | do { |
| 173 | int n = strlen(p->str); |
Michal Schmidt | b1e4d20 | 2011-10-10 00:03:37 +0200 | [diff] [blame] | 174 | if (parameqn(line, p->str, n)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | if (p->early) { |
Rusty Russell | 33df0d1 | 2006-09-26 10:52:32 +0200 | [diff] [blame] | 176 | /* Already done in parse_early_param? |
| 177 | * (Needs exact match on param part). |
| 178 | * Keep iterating, as we can have early |
| 179 | * params and __setups of same names 8( */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | if (line[n] == '\0' || line[n] == '=') |
Rusty Russell | 33df0d1 | 2006-09-26 10:52:32 +0200 | [diff] [blame] | 181 | had_early_param = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | } else if (!p->setup_func) { |
Andrew Morton | ea676e8 | 2013-04-29 16:18:20 -0700 | [diff] [blame] | 183 | pr_warn("Parameter %s is obsolete, ignored\n", |
| 184 | p->str); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | return 1; |
| 186 | } else if (p->setup_func(line + n)) |
| 187 | return 1; |
| 188 | } |
| 189 | p++; |
| 190 | } while (p < __setup_end); |
Rusty Russell | 33df0d1 | 2006-09-26 10:52:32 +0200 | [diff] [blame] | 191 | |
| 192 | return had_early_param; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | } |
| 194 | |
| 195 | /* |
| 196 | * This should be approx 2 Bo*oMips to start (note initial shift), and will |
| 197 | * still work even if initially too large, it will just take slightly longer |
| 198 | */ |
| 199 | unsigned long loops_per_jiffy = (1<<12); |
| 200 | |
| 201 | EXPORT_SYMBOL(loops_per_jiffy); |
| 202 | |
| 203 | static int __init debug_kernel(char *str) |
| 204 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | console_loglevel = 10; |
Yinghai Lu | f6f21c81 | 2008-02-08 04:21:58 -0800 | [diff] [blame] | 206 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | } |
| 208 | |
| 209 | static int __init quiet_kernel(char *str) |
| 210 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | console_loglevel = 4; |
Yinghai Lu | f6f21c81 | 2008-02-08 04:21:58 -0800 | [diff] [blame] | 212 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | } |
| 214 | |
Yinghai Lu | f6f21c81 | 2008-02-08 04:21:58 -0800 | [diff] [blame] | 215 | early_param("debug", debug_kernel); |
| 216 | early_param("quiet", quiet_kernel); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | |
| 218 | static int __init loglevel(char *str) |
| 219 | { |
Alexander Sverdlin | 808bf29 | 2011-09-21 09:51:40 +0200 | [diff] [blame] | 220 | int newlevel; |
| 221 | |
| 222 | /* |
| 223 | * Only update loglevel value when a correct setting was passed, |
| 224 | * to prevent blind crashes (when loglevel being set to 0) that |
| 225 | * are quite hard to debug |
| 226 | */ |
| 227 | if (get_option(&str, &newlevel)) { |
| 228 | console_loglevel = newlevel; |
| 229 | return 0; |
| 230 | } |
| 231 | |
| 232 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | } |
| 234 | |
Yinghai Lu | f6f21c81 | 2008-02-08 04:21:58 -0800 | [diff] [blame] | 235 | early_param("loglevel", loglevel); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | |
Chris Metcalf | a99cd11 | 2012-04-06 12:53:50 -0400 | [diff] [blame] | 237 | /* Change NUL term back to "=", to make "param" the whole string. */ |
Greg Kroah-Hartman | eb15742 | 2012-05-02 14:33:37 -0700 | [diff] [blame] | 238 | static int __init repair_env_string(char *param, char *val, const char *unused) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | if (val) { |
| 241 | /* param=val or param="val"? */ |
| 242 | if (val == param+strlen(param)+1) |
| 243 | val[-1] = '='; |
| 244 | else if (val == param+strlen(param)+2) { |
| 245 | val[-2] = '='; |
| 246 | memmove(val-1, val, strlen(val)+1); |
| 247 | val--; |
| 248 | } else |
| 249 | BUG(); |
| 250 | } |
Chris Metcalf | a99cd11 | 2012-04-06 12:53:50 -0400 | [diff] [blame] | 251 | return 0; |
| 252 | } |
| 253 | |
| 254 | /* |
| 255 | * Unknown boot options get handed to init, unless they look like |
| 256 | * unused parameters (modprobe will find them in /proc/cmdline). |
| 257 | */ |
Greg Kroah-Hartman | eb15742 | 2012-05-02 14:33:37 -0700 | [diff] [blame] | 258 | static int __init unknown_bootoption(char *param, char *val, const char *unused) |
Chris Metcalf | a99cd11 | 2012-04-06 12:53:50 -0400 | [diff] [blame] | 259 | { |
Greg Kroah-Hartman | eb15742 | 2012-05-02 14:33:37 -0700 | [diff] [blame] | 260 | repair_env_string(param, val, unused); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | |
| 262 | /* Handle obsolete-style parameters */ |
| 263 | if (obsolete_checksetup(param)) |
| 264 | return 0; |
| 265 | |
Rusty Russell | f066a4f | 2009-12-01 14:56:44 +1030 | [diff] [blame] | 266 | /* Unused module parameter. */ |
| 267 | if (strchr(param, '.') && (!val || strchr(param, '.') < val)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | |
| 270 | if (panic_later) |
| 271 | return 0; |
| 272 | |
| 273 | if (val) { |
| 274 | /* Environment option */ |
| 275 | unsigned int i; |
| 276 | for (i = 0; envp_init[i]; i++) { |
| 277 | if (i == MAX_INIT_ENVS) { |
| 278 | panic_later = "Too many boot env vars at `%s'"; |
| 279 | panic_param = param; |
| 280 | } |
| 281 | if (!strncmp(param, envp_init[i], val - param)) |
| 282 | break; |
| 283 | } |
| 284 | envp_init[i] = param; |
| 285 | } else { |
| 286 | /* Command line option */ |
| 287 | unsigned int i; |
| 288 | for (i = 0; argv_init[i]; i++) { |
| 289 | if (i == MAX_INIT_ARGS) { |
| 290 | panic_later = "Too many boot init vars at `%s'"; |
| 291 | panic_param = param; |
| 292 | } |
| 293 | } |
| 294 | argv_init[i] = param; |
| 295 | } |
| 296 | return 0; |
| 297 | } |
| 298 | |
| 299 | static int __init init_setup(char *str) |
| 300 | { |
| 301 | unsigned int i; |
| 302 | |
| 303 | execute_command = str; |
| 304 | /* |
| 305 | * In case LILO is going to boot us with default command line, |
| 306 | * it prepends "auto" before the whole cmdline which makes |
| 307 | * the shell think it should execute a script with such name. |
| 308 | * So we ignore all arguments entered _before_ init=... [MJ] |
| 309 | */ |
| 310 | for (i = 1; i < MAX_INIT_ARGS; i++) |
| 311 | argv_init[i] = NULL; |
| 312 | return 1; |
| 313 | } |
| 314 | __setup("init=", init_setup); |
| 315 | |
Olof Johansson | ffdfc40 | 2005-09-06 15:17:19 -0700 | [diff] [blame] | 316 | static int __init rdinit_setup(char *str) |
| 317 | { |
| 318 | unsigned int i; |
| 319 | |
| 320 | ramdisk_execute_command = str; |
| 321 | /* See "auto" comment in init_setup */ |
| 322 | for (i = 1; i < MAX_INIT_ARGS; i++) |
| 323 | argv_init[i] = NULL; |
| 324 | return 1; |
| 325 | } |
| 326 | __setup("rdinit=", rdinit_setup); |
| 327 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | #ifndef CONFIG_SMP |
Amerigo Wang | 34db18a0 | 2011-03-22 16:34:06 -0700 | [diff] [blame] | 329 | static const unsigned int setup_max_cpus = NR_CPUS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | #ifdef CONFIG_X86_LOCAL_APIC |
| 331 | static void __init smp_init(void) |
| 332 | { |
| 333 | APIC_init_uniprocessor(); |
| 334 | } |
| 335 | #else |
| 336 | #define smp_init() do { } while (0) |
| 337 | #endif |
| 338 | |
Mike Travis | e0982e9 | 2008-03-26 14:23:48 -0700 | [diff] [blame] | 339 | static inline void setup_nr_cpu_ids(void) { } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | static inline void smp_prepare_cpus(unsigned int maxcpus) { } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | #endif |
| 342 | |
| 343 | /* |
Alon Bar-Lev | 30d7e0d | 2007-02-12 00:53:52 -0800 | [diff] [blame] | 344 | * We need to store the untouched command line for future reference. |
| 345 | * We also need to store the touched command line since the parameter |
| 346 | * parsing is performed in place, and we should allow a component to |
| 347 | * store reference of name/value for future reference. |
| 348 | */ |
| 349 | static void __init setup_command_line(char *command_line) |
| 350 | { |
| 351 | saved_command_line = alloc_bootmem(strlen (boot_command_line)+1); |
Krzysztof Mazur | 08746a6 | 2013-10-31 13:45:39 +1030 | [diff] [blame^] | 352 | initcall_command_line = alloc_bootmem(strlen (boot_command_line)+1); |
Alon Bar-Lev | 30d7e0d | 2007-02-12 00:53:52 -0800 | [diff] [blame] | 353 | static_command_line = alloc_bootmem(strlen (command_line)+1); |
| 354 | strcpy (saved_command_line, boot_command_line); |
| 355 | strcpy (static_command_line, command_line); |
| 356 | } |
| 357 | |
| 358 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | * We need to finalize in a non-__init function or else race conditions |
| 360 | * between the root thread and the init thread may cause start_kernel to |
| 361 | * be reaped by free_initmem before the root thread has proceeded to |
| 362 | * cpu_idle. |
| 363 | * |
| 364 | * gcc-3.4 accidentally inlines this function, so use noinline. |
| 365 | */ |
| 366 | |
Peter Zijlstra | b433c3d | 2010-06-28 16:51:01 +0200 | [diff] [blame] | 367 | static __initdata DECLARE_COMPLETION(kthreadd_done); |
| 368 | |
Rakib Mullick | f99ebf0 | 2009-01-06 14:40:38 -0800 | [diff] [blame] | 369 | static noinline void __init_refok rest_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | { |
Eric W. Biederman | 73c2799 | 2007-05-09 02:34:32 -0700 | [diff] [blame] | 371 | int pid; |
| 372 | |
Paul E. McKenney | 7db905e | 2009-09-02 14:01:24 -0700 | [diff] [blame] | 373 | rcu_scheduler_starting(); |
Peter Zijlstra | b433c3d | 2010-06-28 16:51:01 +0200 | [diff] [blame] | 374 | /* |
Peter Zijlstra | 9715856 | 2010-06-30 10:37:11 +0200 | [diff] [blame] | 375 | * We need to spawn init first so that it obtains pid 1, however |
Peter Zijlstra | b433c3d | 2010-06-28 16:51:01 +0200 | [diff] [blame] | 376 | * the init task will end up wanting to create kthreads, which, if |
| 377 | * we schedule it before we create kthreadd, will OOPS. |
| 378 | */ |
Sam Ravnborg | aae5f66 | 2007-02-26 16:45:41 +0100 | [diff] [blame] | 379 | kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | numa_default_policy(); |
Eric W. Biederman | 73c2799 | 2007-05-09 02:34:32 -0700 | [diff] [blame] | 381 | pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); |
Paul E. McKenney | d11c563 | 2010-02-22 17:04:50 -0800 | [diff] [blame] | 382 | rcu_read_lock(); |
Pavel Emelyanov | 5cd2045 | 2008-04-30 00:54:24 -0700 | [diff] [blame] | 383 | kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); |
Paul E. McKenney | d11c563 | 2010-02-22 17:04:50 -0800 | [diff] [blame] | 384 | rcu_read_unlock(); |
Peter Zijlstra | b433c3d | 2010-06-28 16:51:01 +0200 | [diff] [blame] | 385 | complete(&kthreadd_done); |
Ingo Molnar | f340c0d | 2005-06-28 16:40:42 +0200 | [diff] [blame] | 386 | |
| 387 | /* |
| 388 | * The boot idle thread must execute schedule() |
Ingo Molnar | 1df2105 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 389 | * at least once to get things moving: |
Ingo Molnar | f340c0d | 2005-06-28 16:40:42 +0200 | [diff] [blame] | 390 | */ |
Ingo Molnar | 1df2105 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 391 | init_idle_bootup_task(current); |
Thomas Gleixner | bd2f553 | 2011-03-21 12:33:18 +0100 | [diff] [blame] | 392 | schedule_preempt_disabled(); |
Nick Piggin | 5bfb5d6 | 2005-11-08 21:39:01 -0800 | [diff] [blame] | 393 | /* Call into cpu_idle with preempt disabled */ |
Thomas Gleixner | a1a04ec | 2013-03-21 22:49:34 +0100 | [diff] [blame] | 394 | cpu_startup_entry(CPUHP_ONLINE); |
Ingo Molnar | 1df2105 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 395 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | |
| 397 | /* Check for early params. */ |
Jim Cromie | 9fb48c7 | 2012-04-27 14:30:34 -0600 | [diff] [blame] | 398 | static int __init do_early_param(char *param, char *val, const char *unused) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | { |
Rusty Russell | 914dcaa | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 400 | const struct obs_kernel_param *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | |
| 402 | for (p = __setup_start; p < __setup_end; p++) { |
Michal Schmidt | b1e4d20 | 2011-10-10 00:03:37 +0200 | [diff] [blame] | 403 | if ((p->early && parameq(param, p->str)) || |
Yinghai Lu | 18a8bd9 | 2007-07-15 23:37:59 -0700 | [diff] [blame] | 404 | (strcmp(param, "console") == 0 && |
| 405 | strcmp(p->str, "earlycon") == 0) |
| 406 | ) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | if (p->setup_func(val) != 0) |
Andrew Morton | ea676e8 | 2013-04-29 16:18:20 -0700 | [diff] [blame] | 408 | pr_warn("Malformed early option '%s'\n", param); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | } |
| 410 | } |
| 411 | /* We accept everything at this stage. */ |
| 412 | return 0; |
| 413 | } |
| 414 | |
Magnus Damm | 1397709 | 2009-03-30 14:37:25 -0700 | [diff] [blame] | 415 | void __init parse_early_options(char *cmdline) |
| 416 | { |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 417 | parse_args("early options", cmdline, NULL, 0, 0, 0, do_early_param); |
Magnus Damm | 1397709 | 2009-03-30 14:37:25 -0700 | [diff] [blame] | 418 | } |
| 419 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | /* Arch code calls this early on, or if not, just before other parsing. */ |
| 421 | void __init parse_early_param(void) |
| 422 | { |
| 423 | static __initdata int done = 0; |
| 424 | static __initdata char tmp_cmdline[COMMAND_LINE_SIZE]; |
| 425 | |
| 426 | if (done) |
| 427 | return; |
| 428 | |
| 429 | /* All fall through to do_early_param. */ |
Alon Bar-Lev | 30d7e0d | 2007-02-12 00:53:52 -0800 | [diff] [blame] | 430 | strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); |
Magnus Damm | 1397709 | 2009-03-30 14:37:25 -0700 | [diff] [blame] | 431 | parse_early_options(tmp_cmdline); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | done = 1; |
| 433 | } |
| 434 | |
| 435 | /* |
| 436 | * Activate the first processor. |
| 437 | */ |
| 438 | |
Stas Sergeev | 44fd229 | 2006-03-23 02:59:44 -0800 | [diff] [blame] | 439 | static void __init boot_cpu_init(void) |
| 440 | { |
| 441 | int cpu = smp_processor_id(); |
| 442 | /* Mark the boot cpu "present", "online" etc for SMP and UP case */ |
Rusty Russell | 915441b | 2009-01-01 10:12:15 +1030 | [diff] [blame] | 443 | set_cpu_online(cpu, true); |
Peter Zijlstra | 933b061 | 2009-12-16 18:04:31 +0100 | [diff] [blame] | 444 | set_cpu_active(cpu, true); |
Rusty Russell | 915441b | 2009-01-01 10:12:15 +1030 | [diff] [blame] | 445 | set_cpu_present(cpu, true); |
| 446 | set_cpu_possible(cpu, true); |
Stas Sergeev | 44fd229 | 2006-03-23 02:59:44 -0800 | [diff] [blame] | 447 | } |
| 448 | |
Benjamin Herrenschmidt | 839ad62 | 2008-04-18 16:56:18 +1000 | [diff] [blame] | 449 | void __init __weak smp_setup_processor_id(void) |
Andrew Morton | 033ab7f | 2006-06-30 01:55:50 -0700 | [diff] [blame] | 450 | { |
| 451 | } |
| 452 | |
David Howells | eded09c | 2012-11-02 13:20:42 +0000 | [diff] [blame] | 453 | # if THREAD_SIZE >= PAGE_SIZE |
Benjamin Herrenschmidt | 8c9843e | 2008-04-18 16:56:15 +1000 | [diff] [blame] | 454 | void __init __weak thread_info_cache_init(void) |
| 455 | { |
| 456 | } |
David Howells | eded09c | 2012-11-02 13:20:42 +0000 | [diff] [blame] | 457 | #endif |
Benjamin Herrenschmidt | 8c9843e | 2008-04-18 16:56:15 +1000 | [diff] [blame] | 458 | |
Pekka Enberg | 444f478 | 2009-06-11 18:29:06 +0300 | [diff] [blame] | 459 | /* |
| 460 | * Set up kernel memory allocators |
| 461 | */ |
| 462 | static void __init mm_init(void) |
| 463 | { |
KAMEZAWA Hiroyuki | ca371c0 | 2009-06-12 10:33:53 +0300 | [diff] [blame] | 464 | /* |
Jim Cromie | 7fa87ce | 2012-03-14 19:12:22 -0600 | [diff] [blame] | 465 | * page_cgroup requires contiguous pages, |
| 466 | * bigger than MAX_ORDER unless SPARSEMEM. |
KAMEZAWA Hiroyuki | ca371c0 | 2009-06-12 10:33:53 +0300 | [diff] [blame] | 467 | */ |
| 468 | page_cgroup_init_flatmem(); |
Pekka Enberg | 444f478 | 2009-06-11 18:29:06 +0300 | [diff] [blame] | 469 | mem_init(); |
| 470 | kmem_cache_init(); |
Tejun Heo | 099a19d | 2010-06-27 18:50:00 +0200 | [diff] [blame] | 471 | percpu_init_late(); |
Benjamin Herrenschmidt | c868d55 | 2009-06-17 13:48:39 +1000 | [diff] [blame] | 472 | pgtable_cache_init(); |
Pekka Enberg | 444f478 | 2009-06-11 18:29:06 +0300 | [diff] [blame] | 473 | vmalloc_init(); |
| 474 | } |
| 475 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | asmlinkage void __init start_kernel(void) |
| 477 | { |
| 478 | char * command_line; |
Rusty Russell | 914dcaa | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 479 | extern const struct kernel_param __start___param[], __stop___param[]; |
Andrew Morton | 033ab7f | 2006-06-30 01:55:50 -0700 | [diff] [blame] | 480 | |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 481 | /* |
| 482 | * Need to run as early as possible, to initialize the |
| 483 | * lockdep hash: |
| 484 | */ |
| 485 | lockdep_init(); |
Ming Lei | 73839c5 | 2011-11-17 13:34:31 +0800 | [diff] [blame] | 486 | smp_setup_processor_id(); |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 487 | debug_objects_early_init(); |
Ingo Molnar | 4205942 | 2008-02-14 09:44:08 +0100 | [diff] [blame] | 488 | |
| 489 | /* |
| 490 | * Set up the the initial canary ASAP: |
| 491 | */ |
| 492 | boot_init_stack_canary(); |
| 493 | |
Paul Menage | ddbcc7e | 2007-10-18 23:39:30 -0700 | [diff] [blame] | 494 | cgroup_init_early(); |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 495 | |
| 496 | local_irq_disable(); |
Tejun Heo | 2ce802f | 2011-01-20 12:06:35 +0100 | [diff] [blame] | 497 | early_boot_irqs_disabled = true; |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 498 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | /* |
| 500 | * Interrupts are still disabled. Do necessary setups, then |
| 501 | * enable them |
| 502 | */ |
Stas Sergeev | 44fd229 | 2006-03-23 02:59:44 -0800 | [diff] [blame] | 503 | boot_cpu_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | page_address_init(); |
Andrew Morton | ea676e8 | 2013-04-29 16:18:20 -0700 | [diff] [blame] | 505 | pr_notice("%s", linux_banner); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | setup_arch(&command_line); |
Balbir Singh | cf475ad | 2008-04-29 01:00:16 -0700 | [diff] [blame] | 507 | mm_init_owner(&init_mm, &init_task); |
Linus Torvalds | 6345d24 | 2011-05-29 11:32:28 -0700 | [diff] [blame] | 508 | mm_init_cpumask(&init_mm); |
Alon Bar-Lev | 30d7e0d | 2007-02-12 00:53:52 -0800 | [diff] [blame] | 509 | setup_command_line(command_line); |
Mike Travis | e0982e9 | 2008-03-26 14:23:48 -0700 | [diff] [blame] | 510 | setup_nr_cpu_ids(); |
Tejun Heo | d6647bd | 2009-07-21 17:11:50 +0900 | [diff] [blame] | 511 | setup_per_cpu_areas(); |
Stas Sergeev | 44fd229 | 2006-03-23 02:59:44 -0800 | [diff] [blame] | 512 | smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | |
Jiang Liu | 9adb62a | 2012-07-31 16:43:28 -0700 | [diff] [blame] | 514 | build_all_zonelists(NULL, NULL); |
Pekka Enberg | 83b519e | 2009-06-10 19:40:04 +0300 | [diff] [blame] | 515 | page_alloc_init(); |
| 516 | |
Andrew Morton | ea676e8 | 2013-04-29 16:18:20 -0700 | [diff] [blame] | 517 | pr_notice("Kernel command line: %s\n", boot_command_line); |
Pekka Enberg | 83b519e | 2009-06-10 19:40:04 +0300 | [diff] [blame] | 518 | parse_early_param(); |
| 519 | parse_args("Booting kernel", static_command_line, __start___param, |
| 520 | __stop___param - __start___param, |
Rusty Russell | ae82fdb | 2012-06-08 14:58:13 +0930 | [diff] [blame] | 521 | -1, -1, &unknown_bootoption); |
Jeremy Fitzhardinge | 97ce2c8 | 2011-10-12 16:17:54 -0700 | [diff] [blame] | 522 | |
| 523 | jump_label_init(); |
| 524 | |
Pekka Enberg | 83b519e | 2009-06-10 19:40:04 +0300 | [diff] [blame] | 525 | /* |
| 526 | * These use large bootmem allocations and must precede |
| 527 | * kmem_cache_init() |
| 528 | */ |
Mike Travis | 162a7e7 | 2011-05-24 17:13:20 -0700 | [diff] [blame] | 529 | setup_log_buf(0); |
Pekka Enberg | 83b519e | 2009-06-10 19:40:04 +0300 | [diff] [blame] | 530 | pidhash_init(); |
Pekka Enberg | 83b519e | 2009-06-10 19:40:04 +0300 | [diff] [blame] | 531 | vfs_caches_init_early(); |
| 532 | sort_main_extable(); |
| 533 | trap_init(); |
Pekka Enberg | 444f478 | 2009-06-11 18:29:06 +0300 | [diff] [blame] | 534 | mm_init(); |
KOSAKI Motohiro | de03c72 | 2011-05-24 17:12:15 -0700 | [diff] [blame] | 535 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | /* |
| 537 | * Set up the scheduler prior starting any interrupts (such as the |
| 538 | * timer interrupt). Full topology setup happens at smp_init() |
| 539 | * time - but meanwhile we still have a functioning scheduler. |
| 540 | */ |
| 541 | sched_init(); |
| 542 | /* |
| 543 | * Disable preemption - early bootup scheduling is extremely |
| 544 | * fragile until we cpu_idle() for the first time. |
| 545 | */ |
| 546 | preempt_disable(); |
Steven Rostedt | f91eb62 | 2013-04-29 16:18:18 -0700 | [diff] [blame] | 547 | if (WARN(!irqs_disabled(), "Interrupts were enabled *very* early, fixing it\n")) |
Ard van Breemen | c4a6830 | 2007-01-05 16:36:19 -0800 | [diff] [blame] | 548 | local_irq_disable(); |
Peter Zijlstra | 9f58a20 | 2010-11-17 23:17:35 +0100 | [diff] [blame] | 549 | idr_init_cache(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | rcu_init(); |
Frederic Weisbecker | d1e43fa | 2013-03-26 23:47:24 +0100 | [diff] [blame] | 551 | tick_nohz_init(); |
Frederic Weisbecker | 65f382f | 2013-07-11 19:12:32 +0200 | [diff] [blame] | 552 | context_tracking_init(); |
Yinghai Lu | 773e3eb | 2010-02-10 01:20:33 -0800 | [diff] [blame] | 553 | radix_tree_init(); |
Yinghai Lu | 0b8f1ef | 2008-12-05 18:58:31 -0800 | [diff] [blame] | 554 | /* init some links before init_ISA_irqs() */ |
| 555 | early_irq_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | init_IRQ(); |
Thomas Gleixner | ad2b135 | 2013-03-05 15:14:05 +0100 | [diff] [blame] | 557 | tick_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | init_timers(); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 559 | hrtimers_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | softirq_init(); |
john stultz | ad59617 | 2006-06-26 00:25:06 -0700 | [diff] [blame] | 561 | timekeeping_init(); |
john stultz | 88fecaa | 2006-07-03 00:24:04 -0700 | [diff] [blame] | 562 | time_init(); |
Stephen Boyd | 38ff87f | 2013-06-01 23:39:40 -0700 | [diff] [blame] | 563 | sched_clock_postinit(); |
Stephane Eranian | 9e63020 | 2013-04-03 14:21:33 +0200 | [diff] [blame] | 564 | perf_event_init(); |
Heiko Carstens | 93e0281 | 2006-07-03 00:24:24 -0700 | [diff] [blame] | 565 | profile_init(); |
Takao Indoh | d8ad7d1 | 2011-03-29 12:35:04 -0400 | [diff] [blame] | 566 | call_function_init(); |
Steven Rostedt | f91eb62 | 2013-04-29 16:18:18 -0700 | [diff] [blame] | 567 | WARN(!irqs_disabled(), "Interrupts were enabled early\n"); |
Tejun Heo | 2ce802f | 2011-01-20 12:06:35 +0100 | [diff] [blame] | 568 | early_boot_irqs_disabled = false; |
Heiko Carstens | 93e0281 | 2006-07-03 00:24:24 -0700 | [diff] [blame] | 569 | local_irq_enable(); |
Benjamin Herrenschmidt | dcce284 | 2009-06-18 13:24:12 +1000 | [diff] [blame] | 570 | |
Pekka Enberg | 7e85ee0 | 2009-06-12 14:03:06 +0300 | [diff] [blame] | 571 | kmem_cache_init_late(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | |
| 573 | /* |
| 574 | * HACK ALERT! This is early. We're enabling the console before |
| 575 | * we've done PCI setups etc, and console_init() must be aware of |
| 576 | * this. But we do want output early, in case something goes wrong. |
| 577 | */ |
| 578 | console_init(); |
| 579 | if (panic_later) |
| 580 | panic(panic_later, panic_param); |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 581 | |
| 582 | lockdep_info(); |
| 583 | |
Ingo Molnar | 9a11b49a | 2006-07-03 00:24:33 -0700 | [diff] [blame] | 584 | /* |
| 585 | * Need to run this when irqs are enabled, because it wants |
| 586 | * to self-test [hard/soft]-irqs on/off lock inversion bugs |
| 587 | * too: |
| 588 | */ |
| 589 | locking_selftest(); |
| 590 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | #ifdef CONFIG_BLK_DEV_INITRD |
| 592 | if (initrd_start && !initrd_below_start_ok && |
Geert Uytterhoeven | bd673c7 | 2008-07-29 22:33:36 -0700 | [diff] [blame] | 593 | page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { |
Andrew Morton | ea676e8 | 2013-04-29 16:18:20 -0700 | [diff] [blame] | 594 | pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n", |
Geert Uytterhoeven | bd673c7 | 2008-07-29 22:33:36 -0700 | [diff] [blame] | 595 | page_to_pfn(virt_to_page((void *)initrd_start)), |
| 596 | min_low_pfn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | initrd_start = 0; |
| 598 | } |
| 599 | #endif |
KAMEZAWA Hiroyuki | 94b6da5 | 2008-10-22 14:15:05 -0700 | [diff] [blame] | 600 | page_cgroup_init(); |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 601 | debug_objects_mem_init(); |
Catalin Marinas | 9b090f2 | 2011-05-19 16:25:30 +0100 | [diff] [blame] | 602 | kmemleak_init(); |
Christoph Lameter | e7c8d5c | 2005-06-21 17:14:47 -0700 | [diff] [blame] | 603 | setup_per_cpu_pageset(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | numa_policy_init(); |
| 605 | if (late_time_init) |
| 606 | late_time_init(); |
Thomas Gleixner | fa84e9e | 2009-08-21 22:01:12 +0200 | [diff] [blame] | 607 | sched_clock_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | calibrate_delay(); |
| 609 | pidmap_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | anon_vma_init(); |
Linus Torvalds | 11520e5 | 2012-12-15 15:15:24 -0800 | [diff] [blame] | 611 | #ifdef CONFIG_X86 |
Matt Fleming | 83e6818 | 2012-11-14 09:42:35 +0000 | [diff] [blame] | 612 | if (efi_enabled(EFI_RUNTIME_SERVICES)) |
Linus Torvalds | 11520e5 | 2012-12-15 15:15:24 -0800 | [diff] [blame] | 613 | efi_enter_virtual_mode(); |
| 614 | #endif |
Benjamin Herrenschmidt | 8c9843e | 2008-04-18 16:56:15 +1000 | [diff] [blame] | 615 | thread_info_cache_init(); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 616 | cred_init(); |
Jan Beulich | 4481374 | 2009-09-21 17:03:05 -0700 | [diff] [blame] | 617 | fork_init(totalram_pages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | proc_caches_init(); |
| 619 | buffer_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | key_init(); |
| 621 | security_init(); |
Jason Wessel | 0b4b382 | 2010-05-20 21:04:29 -0500 | [diff] [blame] | 622 | dbg_late_init(); |
Jan Beulich | 4481374 | 2009-09-21 17:03:05 -0700 | [diff] [blame] | 623 | vfs_caches_init(totalram_pages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | signals_init(); |
| 625 | /* rootfs populating might need page-writeback */ |
| 626 | page_writeback_init(); |
| 627 | #ifdef CONFIG_PROC_FS |
| 628 | proc_root_init(); |
| 629 | #endif |
Paul Menage | ddbcc7e | 2007-10-18 23:39:30 -0700 | [diff] [blame] | 630 | cgroup_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | cpuset_init(); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 632 | taskstats_init_early(); |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 633 | delayacct_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | |
| 635 | check_bugs(); |
| 636 | |
| 637 | acpi_early_init(); /* before LAPIC and SMP init */ |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 638 | sfi_init_late(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | |
Matt Fleming | 83e6818 | 2012-11-14 09:42:35 +0000 | [diff] [blame] | 640 | if (efi_enabled(EFI_RUNTIME_SERVICES)) { |
Josh Triplett | 2223af3 | 2012-09-28 17:57:05 -0700 | [diff] [blame] | 641 | efi_late_init(); |
Josh Triplett | 7851079 | 2012-09-28 17:55:44 -0700 | [diff] [blame] | 642 | efi_free_boot_services(); |
Josh Triplett | 2223af3 | 2012-09-28 17:57:05 -0700 | [diff] [blame] | 643 | } |
Josh Triplett | 7851079 | 2012-09-28 17:55:44 -0700 | [diff] [blame] | 644 | |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 645 | ftrace_init(); |
| 646 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | /* Do the rest non-__init'ed, we're now alive */ |
| 648 | rest_init(); |
| 649 | } |
| 650 | |
Peter Oberparleiter | b99b87f | 2009-06-17 16:28:03 -0700 | [diff] [blame] | 651 | /* Call all constructor functions linked into the kernel. */ |
| 652 | static void __init do_ctors(void) |
| 653 | { |
| 654 | #ifdef CONFIG_CONSTRUCTORS |
H Hartley Sweeten | 196a15b | 2009-12-14 18:00:18 -0800 | [diff] [blame] | 655 | ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; |
Peter Oberparleiter | b99b87f | 2009-06-17 16:28:03 -0700 | [diff] [blame] | 656 | |
H Hartley Sweeten | 196a15b | 2009-12-14 18:00:18 -0800 | [diff] [blame] | 657 | for (; fn < (ctor_fn_t *) __ctors_end; fn++) |
| 658 | (*fn)(); |
Peter Oberparleiter | b99b87f | 2009-06-17 16:28:03 -0700 | [diff] [blame] | 659 | #endif |
| 660 | } |
| 661 | |
Rusty Russell | 2329abf | 2012-01-13 09:32:18 +1030 | [diff] [blame] | 662 | bool initcall_debug; |
Rusty Russell | d0ea3d7 | 2008-10-22 10:00:23 -0500 | [diff] [blame] | 663 | core_param(initcall_debug, initcall_debug, bool, 0644); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | |
Kevin Winchester | e446127 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 665 | static int __init_or_module do_one_initcall_debug(initcall_t fn) |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 666 | { |
Frederic Weisbecker | 7423907 | 2008-11-11 23:24:42 +0100 | [diff] [blame] | 667 | ktime_t calltime, delta, rettime; |
Américo Wang | 30dbb20e | 2010-05-26 18:57:53 +0800 | [diff] [blame] | 668 | unsigned long long duration; |
| 669 | int ret; |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 670 | |
Andrew Morton | ea676e8 | 2013-04-29 16:18:20 -0700 | [diff] [blame] | 671 | pr_debug("calling %pF @ %i\n", fn, task_pid_nr(current)); |
Kevin Winchester | 22c5c03 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 672 | calltime = ktime_get(); |
Américo Wang | 30dbb20e | 2010-05-26 18:57:53 +0800 | [diff] [blame] | 673 | ret = fn(); |
Kevin Winchester | 22c5c03 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 674 | rettime = ktime_get(); |
| 675 | delta = ktime_sub(rettime, calltime); |
| 676 | duration = (unsigned long long) ktime_to_ns(delta) >> 10; |
Andrew Morton | ea676e8 | 2013-04-29 16:18:20 -0700 | [diff] [blame] | 677 | pr_debug("initcall %pF returned %d after %lld usecs\n", |
| 678 | fn, ret, duration); |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 679 | |
Kevin Winchester | 22c5c03 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 680 | return ret; |
| 681 | } |
| 682 | |
Kevin Winchester | e446127 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 683 | int __init_or_module do_one_initcall(initcall_t fn) |
Kevin Winchester | 22c5c03 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 684 | { |
| 685 | int count = preempt_count(); |
| 686 | int ret; |
Steven Rostedt | ff1c8fa | 2013-07-03 15:05:37 -0700 | [diff] [blame] | 687 | char msgbuf[64]; |
Kevin Winchester | 22c5c03 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 688 | |
| 689 | if (initcall_debug) |
| 690 | ret = do_one_initcall_debug(fn); |
| 691 | else |
| 692 | ret = fn(); |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 693 | |
| 694 | msgbuf[0] = 0; |
| 695 | |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 696 | if (preempt_count() != count) { |
Steven Rostedt | bf5d770 | 2013-05-01 13:35:51 -0400 | [diff] [blame] | 697 | sprintf(msgbuf, "preemption imbalance "); |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 698 | preempt_count() = count; |
| 699 | } |
| 700 | if (irqs_disabled()) { |
Cyrill Gorcunov | a76bfd0 | 2008-05-15 13:52:41 -0700 | [diff] [blame] | 701 | strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 702 | local_irq_enable(); |
| 703 | } |
Steven Rostedt | f91eb62 | 2013-04-29 16:18:18 -0700 | [diff] [blame] | 704 | WARN(msgbuf[0], "initcall %pF returned with %s\n", fn, msgbuf); |
Arjan van de Ven | 59f9415 | 2008-07-30 12:49:02 -0700 | [diff] [blame] | 705 | |
Américo Wang | 30dbb20e | 2010-05-26 18:57:53 +0800 | [diff] [blame] | 706 | return ret; |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 707 | } |
| 708 | |
| 709 | |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 710 | extern initcall_t __initcall_start[]; |
| 711 | extern initcall_t __initcall0_start[]; |
| 712 | extern initcall_t __initcall1_start[]; |
| 713 | extern initcall_t __initcall2_start[]; |
| 714 | extern initcall_t __initcall3_start[]; |
| 715 | extern initcall_t __initcall4_start[]; |
| 716 | extern initcall_t __initcall5_start[]; |
| 717 | extern initcall_t __initcall6_start[]; |
| 718 | extern initcall_t __initcall7_start[]; |
| 719 | extern initcall_t __initcall_end[]; |
| 720 | |
| 721 | static initcall_t *initcall_levels[] __initdata = { |
| 722 | __initcall0_start, |
| 723 | __initcall1_start, |
| 724 | __initcall2_start, |
| 725 | __initcall3_start, |
| 726 | __initcall4_start, |
| 727 | __initcall5_start, |
| 728 | __initcall6_start, |
| 729 | __initcall7_start, |
| 730 | __initcall_end, |
| 731 | }; |
| 732 | |
Jim Cromie | 96263d2 | 2012-06-14 16:00:59 -0600 | [diff] [blame] | 733 | /* Keep these in sync with initcalls in include/linux/init.h */ |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 734 | static char *initcall_level_names[] __initdata = { |
Jim Cromie | 9fb48c7 | 2012-04-27 14:30:34 -0600 | [diff] [blame] | 735 | "early", |
| 736 | "core", |
| 737 | "postcore", |
| 738 | "arch", |
| 739 | "subsys", |
| 740 | "fs", |
| 741 | "device", |
| 742 | "late", |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 743 | }; |
| 744 | |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 745 | static void __init do_initcall_level(int level) |
| 746 | { |
| 747 | extern const struct kernel_param __start___param[], __stop___param[]; |
| 748 | initcall_t *fn; |
| 749 | |
Krzysztof Mazur | 08746a6 | 2013-10-31 13:45:39 +1030 | [diff] [blame^] | 750 | strcpy(initcall_command_line, saved_command_line); |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 751 | parse_args(initcall_level_names[level], |
Krzysztof Mazur | 08746a6 | 2013-10-31 13:45:39 +1030 | [diff] [blame^] | 752 | initcall_command_line, __start___param, |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 753 | __stop___param - __start___param, |
| 754 | level, level, |
Greg Kroah-Hartman | eb15742 | 2012-05-02 14:33:37 -0700 | [diff] [blame] | 755 | &repair_env_string); |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 756 | |
| 757 | for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++) |
| 758 | do_one_initcall(*fn); |
| 759 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | |
| 761 | static void __init do_initcalls(void) |
| 762 | { |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 763 | int level; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | |
Borislav Petkov | 19efb72 | 2012-06-01 18:56:00 +0200 | [diff] [blame] | 765 | for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 766 | do_initcall_level(level); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | } |
| 768 | |
| 769 | /* |
| 770 | * Ok, the machine is now initialized. None of the devices |
| 771 | * have been touched yet, but the CPU subsystem is up and |
| 772 | * running, and memory and process management works. |
| 773 | * |
| 774 | * Now we can finally start doing some real work.. |
| 775 | */ |
| 776 | static void __init do_basic_setup(void) |
| 777 | { |
Lai Jiangshan | 759ee09 | 2009-03-25 17:06:30 +0800 | [diff] [blame] | 778 | cpuset_init_smp(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | usermodehelper_init(); |
Hugh Dickins | 41ffe5d | 2011-08-03 16:21:21 -0700 | [diff] [blame] | 780 | shmem_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | driver_init(); |
Eric W. Biederman | b04c3af | 2007-02-14 00:33:57 -0800 | [diff] [blame] | 782 | init_irq_proc(); |
Peter Oberparleiter | b99b87f | 2009-06-17 16:28:03 -0700 | [diff] [blame] | 783 | do_ctors(); |
Linus Torvalds | d5767c5 | 2011-09-28 10:23:44 -0700 | [diff] [blame] | 784 | usermodehelper_enable(); |
wangyanqing | b0f8437 | 2011-09-29 15:09:40 +0800 | [diff] [blame] | 785 | do_initcalls(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | } |
| 787 | |
Eduard - Gabriel Munteanu | 7babe8d | 2008-07-25 19:45:11 -0700 | [diff] [blame] | 788 | static void __init do_pre_smp_initcalls(void) |
Eduard - Gabriel Munteanu | c2147a5 | 2008-07-25 19:45:11 -0700 | [diff] [blame] | 789 | { |
H Hartley Sweeten | 196a15b | 2009-12-14 18:00:18 -0800 | [diff] [blame] | 790 | initcall_t *fn; |
Eduard - Gabriel Munteanu | c2147a5 | 2008-07-25 19:45:11 -0700 | [diff] [blame] | 791 | |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 792 | for (fn = __initcall_start; fn < __initcall0_start; fn++) |
H Hartley Sweeten | 196a15b | 2009-12-14 18:00:18 -0800 | [diff] [blame] | 793 | do_one_initcall(*fn); |
Eduard - Gabriel Munteanu | c2147a5 | 2008-07-25 19:45:11 -0700 | [diff] [blame] | 794 | } |
| 795 | |
Tejun Heo | bb813f4 | 2013-01-18 14:05:56 -0800 | [diff] [blame] | 796 | /* |
| 797 | * This function requests modules which should be loaded by default and is |
| 798 | * called twice right after initrd is mounted and right before init is |
| 799 | * exec'd. If such modules are on either initrd or rootfs, they will be |
| 800 | * loaded before control is passed to userland. |
| 801 | */ |
| 802 | void __init load_default_modules(void) |
| 803 | { |
| 804 | load_default_elevator_module(); |
| 805 | } |
| 806 | |
Al Viro | a74fb73 | 2012-10-10 21:28:25 -0400 | [diff] [blame] | 807 | static int run_init_process(const char *init_filename) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | { |
| 809 | argv_init[0] = init_filename; |
Al Viro | ae903ca | 2012-12-14 12:44:11 -0500 | [diff] [blame] | 810 | return do_execve(init_filename, |
| 811 | (const char __user *const __user *)argv_init, |
| 812 | (const char __user *const __user *)envp_init); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | } |
| 814 | |
Vineet Gupta | f80b0c9 | 2012-12-21 12:25:44 +0530 | [diff] [blame] | 815 | static noinline void __init kernel_init_freeable(void); |
Al Viro | d6b2123 | 2012-10-10 19:57:26 -0400 | [diff] [blame] | 816 | |
| 817 | static int __ref kernel_init(void *unused) |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 818 | { |
Al Viro | d6b2123 | 2012-10-10 19:57:26 -0400 | [diff] [blame] | 819 | kernel_init_freeable(); |
Arjan van de Ven | 22a9d64 | 2009-01-07 08:45:46 -0800 | [diff] [blame] | 820 | /* need to finish all async __init code before freeing the memory */ |
| 821 | async_synchronize_full(); |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 822 | free_initmem(); |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 823 | mark_rodata_ro(); |
| 824 | system_state = SYSTEM_RUNNING; |
| 825 | numa_default_policy(); |
| 826 | |
Al Viro | 4a9d4b0 | 2012-06-24 09:56:45 +0400 | [diff] [blame] | 827 | flush_delayed_fput(); |
Oleg Nesterov | fae5fa4 | 2008-04-30 00:53:03 -0700 | [diff] [blame] | 828 | |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 829 | if (ramdisk_execute_command) { |
Al Viro | a74fb73 | 2012-10-10 21:28:25 -0400 | [diff] [blame] | 830 | if (!run_init_process(ramdisk_execute_command)) |
| 831 | return 0; |
Andrew Morton | ea676e8 | 2013-04-29 16:18:20 -0700 | [diff] [blame] | 832 | pr_err("Failed to execute %s\n", ramdisk_execute_command); |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 833 | } |
| 834 | |
| 835 | /* |
| 836 | * We try each of these until one succeeds. |
| 837 | * |
| 838 | * The Bourne shell can be used instead of init if we are |
| 839 | * trying to recover a really broken machine. |
| 840 | */ |
| 841 | if (execute_command) { |
Al Viro | a74fb73 | 2012-10-10 21:28:25 -0400 | [diff] [blame] | 842 | if (!run_init_process(execute_command)) |
| 843 | return 0; |
Andrew Morton | ea676e8 | 2013-04-29 16:18:20 -0700 | [diff] [blame] | 844 | pr_err("Failed to execute %s. Attempting defaults...\n", |
| 845 | execute_command); |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 846 | } |
Al Viro | a74fb73 | 2012-10-10 21:28:25 -0400 | [diff] [blame] | 847 | if (!run_init_process("/sbin/init") || |
| 848 | !run_init_process("/etc/init") || |
| 849 | !run_init_process("/bin/init") || |
| 850 | !run_init_process("/bin/sh")) |
| 851 | return 0; |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 852 | |
Andreas Mohr | 9a85b8d | 2010-03-05 13:42:39 -0800 | [diff] [blame] | 853 | panic("No init found. Try passing init= option to kernel. " |
| 854 | "See Linux Documentation/init.txt for guidance."); |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 855 | } |
| 856 | |
Vineet Gupta | f80b0c9 | 2012-12-21 12:25:44 +0530 | [diff] [blame] | 857 | static noinline void __init kernel_init_freeable(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | { |
Peter Zijlstra | b433c3d | 2010-06-28 16:51:01 +0200 | [diff] [blame] | 859 | /* |
| 860 | * Wait until kthreadd is all set-up. |
| 861 | */ |
| 862 | wait_for_completion(&kthreadd_done); |
Linus Torvalds | 31a6710 | 2012-05-21 12:52:42 -0700 | [diff] [blame] | 863 | |
| 864 | /* Now the scheduler is fully set up and can do blocking allocations */ |
| 865 | gfp_allowed_mask = __GFP_BITS_MASK; |
| 866 | |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 867 | /* |
| 868 | * init can allocate pages on any node |
| 869 | */ |
Lai Jiangshan | 3c466d4 | 2012-12-12 13:51:40 -0800 | [diff] [blame] | 870 | set_mems_allowed(node_states[N_MEMORY]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | /* |
| 872 | * init can run on any cpu. |
| 873 | */ |
Rusty Russell | 1a2142a | 2009-03-30 22:05:10 -0600 | [diff] [blame] | 874 | set_cpus_allowed_ptr(current, cpu_all_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | |
Cedric Le Goater | 9ec5209 | 2006-10-02 02:19:00 -0700 | [diff] [blame] | 876 | cad_pid = task_pid(current); |
| 877 | |
Andi Kleen | ca74a6f | 2008-01-30 13:33:17 +0100 | [diff] [blame] | 878 | smp_prepare_cpus(setup_max_cpus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | |
| 880 | do_pre_smp_initcalls(); |
Peter Zijlstra | 004417a | 2010-11-25 18:38:29 +0100 | [diff] [blame] | 881 | lockup_detector_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | smp_init(); |
| 884 | sched_init_smp(); |
| 885 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | do_basic_setup(); |
| 887 | |
Eric W. Biederman | 2bd3a997 | 2010-03-02 23:53:19 -0800 | [diff] [blame] | 888 | /* Open the /dev/console on the rootfs, this should never fail */ |
| 889 | if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0) |
Andrew Morton | ea676e8 | 2013-04-29 16:18:20 -0700 | [diff] [blame] | 890 | pr_err("Warning: unable to open an initial console.\n"); |
Eric W. Biederman | 2bd3a997 | 2010-03-02 23:53:19 -0800 | [diff] [blame] | 891 | |
| 892 | (void) sys_dup(0); |
| 893 | (void) sys_dup(0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | /* |
| 895 | * check if there is an early userspace init. If yes, let it do all |
| 896 | * the work |
| 897 | */ |
Olof Johansson | ffdfc40 | 2005-09-06 15:17:19 -0700 | [diff] [blame] | 898 | |
| 899 | if (!ramdisk_execute_command) |
| 900 | ramdisk_execute_command = "/init"; |
| 901 | |
| 902 | if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) { |
| 903 | ramdisk_execute_command = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | prepare_namespace(); |
Olof Johansson | ffdfc40 | 2005-09-06 15:17:19 -0700 | [diff] [blame] | 905 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | |
| 907 | /* |
| 908 | * Ok, we have completed the initial bootup, and |
| 909 | * we're essentially up and running. Get rid of the |
| 910 | * initmem segments and start the user-mode stuff.. |
| 911 | */ |
Tejun Heo | bb813f4 | 2013-01-18 14:05:56 -0800 | [diff] [blame] | 912 | |
| 913 | /* rootfs is available now, try loading default modules */ |
| 914 | load_default_modules(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | } |