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 |
Fabian Frederick | dd4d9fe | 2014-08-08 14:23:44 -0700 | [diff] [blame] | 9 | * Simplified starting of init: Michael A. Griffith <grif@acm.org> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Joonsoo Kim | eefa864b | 2014-12-12 16:55:46 -0800 | [diff] [blame] | 54 | #include <linux/page_ext.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> |
Theodore Ts'o | 47d06e5 | 2013-09-10 10:52:35 -0400 | [diff] [blame] | 79 | #include <linux/random.h> |
Prarit Bhargava | 7b0b73d | 2014-06-04 16:12:17 -0700 | [diff] [blame] | 80 | #include <linux/list.h> |
Dmitry Kasatkin | c9cd2ce | 2014-11-05 17:01:15 +0200 | [diff] [blame] | 81 | #include <linux/integrity.h> |
Al Viro | e149ed2 | 2014-11-01 10:57:28 -0400 | [diff] [blame] | 82 | #include <linux/proc_ns.h> |
Toshi Kani | 0ddab1d | 2015-04-14 15:47:20 -0700 | [diff] [blame] | 83 | #include <linux/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | |
| 85 | #include <asm/io.h> |
| 86 | #include <asm/bugs.h> |
| 87 | #include <asm/setup.h> |
Andi Kleen | a940199 | 2005-07-28 21:15:30 -0700 | [diff] [blame] | 88 | #include <asm/sections.h> |
Arjan van de Ven | 37b73c8 | 2006-01-06 00:12:01 -0800 | [diff] [blame] | 89 | #include <asm/cacheflush.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | |
Sam Ravnborg | aae5f66 | 2007-02-26 16:45:41 +0100 | [diff] [blame] | 91 | static int kernel_init(void *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | |
| 93 | extern void init_IRQ(void); |
Heinrich Schuchardt | ff691f6 | 2015-04-16 12:47:44 -0700 | [diff] [blame] | 94 | extern void fork_init(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | extern void radix_tree_init(void); |
Arjan van de Ven | 37b73c8 | 2006-01-06 00:12:01 -0800 | [diff] [blame] | 96 | #ifndef CONFIG_DEBUG_RODATA |
| 97 | static inline void mark_rodata_ro(void) { } |
| 98 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | |
Tejun Heo | 2ce802f | 2011-01-20 12:06:35 +0100 | [diff] [blame] | 100 | /* |
| 101 | * Debug helper: via this flag we know that we are in 'early bootup code' |
| 102 | * where only the boot processor is running with IRQ disabled. This means |
| 103 | * two things - IRQ must not be enabled before the flag is cleared and some |
| 104 | * operations which are not allowed with IRQ disabled are allowed while the |
| 105 | * flag is set. |
| 106 | */ |
| 107 | bool early_boot_irqs_disabled __read_mostly; |
| 108 | |
Paul E. McKenney | a682604 | 2009-02-25 18:03:42 -0800 | [diff] [blame] | 109 | enum system_states system_state __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | EXPORT_SYMBOL(system_state); |
| 111 | |
| 112 | /* |
| 113 | * Boot command-line arguments |
| 114 | */ |
| 115 | #define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT |
| 116 | #define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT |
| 117 | |
| 118 | extern void time_init(void); |
| 119 | /* Default late time init is NULL. archs can override this later. */ |
Jan Beulich | d2e3192 | 2009-01-06 14:41:10 -0800 | [diff] [blame] | 120 | void (*__initdata late_time_init)(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | |
Alon Bar-Lev | 30d7e0d | 2007-02-12 00:53:52 -0800 | [diff] [blame] | 122 | /* Untouched command line saved by arch-specific code. */ |
| 123 | char __initdata boot_command_line[COMMAND_LINE_SIZE]; |
| 124 | /* Untouched saved command line (eg. for /proc) */ |
| 125 | char *saved_command_line; |
| 126 | /* Command line for parameter parsing */ |
| 127 | static char *static_command_line; |
Krzysztof Mazur | 08746a6 | 2013-10-31 13:45:39 +1030 | [diff] [blame] | 128 | /* Command line for per-initcall parameter parsing */ |
| 129 | static char *initcall_command_line; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | |
| 131 | static char *execute_command; |
Olof Johansson | ffdfc40 | 2005-09-06 15:17:19 -0700 | [diff] [blame] | 132 | static char *ramdisk_execute_command; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | |
Jan Beulich | 8b3b295 | 2007-07-15 23:41:07 -0700 | [diff] [blame] | 134 | /* |
Hannes Frederic Sowa | c4b2c0c | 2013-10-19 21:48:53 +0200 | [diff] [blame] | 135 | * Used to generate warnings if static_key manipulation functions are used |
| 136 | * before jump_label_init is called. |
| 137 | */ |
Fabian Frederick | dd4d9fe | 2014-08-08 14:23:44 -0700 | [diff] [blame] | 138 | bool static_key_initialized __read_mostly; |
Hannes Frederic Sowa | c4b2c0c | 2013-10-19 21:48:53 +0200 | [diff] [blame] | 139 | EXPORT_SYMBOL_GPL(static_key_initialized); |
| 140 | |
| 141 | /* |
Jan Beulich | 8b3b295 | 2007-07-15 23:41:07 -0700 | [diff] [blame] | 142 | * If set, this is an indication to the drivers that reset the underlying |
| 143 | * device before going ahead with the initialization otherwise driver might |
| 144 | * rely on the BIOS and skip the reset operation. |
| 145 | * |
| 146 | * This is useful if kernel is booting in an unreliable environment. |
Frans Klaver | fc454fd | 2015-02-23 22:05:56 +0100 | [diff] [blame] | 147 | * For ex. kdump situation where previous kernel has crashed, BIOS has been |
Jan Beulich | 8b3b295 | 2007-07-15 23:41:07 -0700 | [diff] [blame] | 148 | * skipped and devices will be in unknown state. |
| 149 | */ |
| 150 | unsigned int reset_devices; |
| 151 | EXPORT_SYMBOL(reset_devices); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | |
Vivek Goyal | 7e96287 | 2006-09-27 01:50:44 -0700 | [diff] [blame] | 153 | static int __init set_reset_devices(char *str) |
| 154 | { |
| 155 | reset_devices = 1; |
| 156 | return 1; |
| 157 | } |
| 158 | |
| 159 | __setup("reset_devices", set_reset_devices); |
| 160 | |
Fabian Frederick | dd4d9fe | 2014-08-08 14:23:44 -0700 | [diff] [blame] | 161 | static const char *argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; |
| 162 | const char *envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | static const char *panic_later, *panic_param; |
| 164 | |
Rusty Russell | 914dcaa | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 165 | extern const struct obs_kernel_param __setup_start[], __setup_end[]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | |
Yaowei Bai | 31c025b | 2016-01-20 14:59:27 -0800 | [diff] [blame] | 167 | static bool __init obsolete_checksetup(char *line) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | { |
Rusty Russell | 914dcaa | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 169 | const struct obs_kernel_param *p; |
Yaowei Bai | 31c025b | 2016-01-20 14:59:27 -0800 | [diff] [blame] | 170 | bool had_early_param = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | |
| 172 | p = __setup_start; |
| 173 | do { |
| 174 | int n = strlen(p->str); |
Michal Schmidt | b1e4d20 | 2011-10-10 00:03:37 +0200 | [diff] [blame] | 175 | if (parameqn(line, p->str, n)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | if (p->early) { |
Rusty Russell | 33df0d1 | 2006-09-26 10:52:32 +0200 | [diff] [blame] | 177 | /* Already done in parse_early_param? |
| 178 | * (Needs exact match on param part). |
| 179 | * Keep iterating, as we can have early |
| 180 | * params and __setups of same names 8( */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | if (line[n] == '\0' || line[n] == '=') |
Yaowei Bai | 31c025b | 2016-01-20 14:59:27 -0800 | [diff] [blame] | 182 | had_early_param = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | } else if (!p->setup_func) { |
Andrew Morton | ea676e8 | 2013-04-29 16:18:20 -0700 | [diff] [blame] | 184 | pr_warn("Parameter %s is obsolete, ignored\n", |
| 185 | p->str); |
Yaowei Bai | 31c025b | 2016-01-20 14:59:27 -0800 | [diff] [blame] | 186 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | } else if (p->setup_func(line + n)) |
Yaowei Bai | 31c025b | 2016-01-20 14:59:27 -0800 | [diff] [blame] | 188 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | } |
| 190 | p++; |
| 191 | } while (p < __setup_end); |
Rusty Russell | 33df0d1 | 2006-09-26 10:52:32 +0200 | [diff] [blame] | 192 | |
| 193 | return had_early_param; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | } |
| 195 | |
| 196 | /* |
| 197 | * This should be approx 2 Bo*oMips to start (note initial shift), and will |
| 198 | * still work even if initially too large, it will just take slightly longer |
| 199 | */ |
| 200 | unsigned long loops_per_jiffy = (1<<12); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | EXPORT_SYMBOL(loops_per_jiffy); |
| 202 | |
| 203 | static int __init debug_kernel(char *str) |
| 204 | { |
Borislav Petkov | a8fe19e | 2014-06-04 16:11:46 -0700 | [diff] [blame] | 205 | console_loglevel = CONSOLE_LOGLEVEL_DEBUG; |
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 | { |
Borislav Petkov | a8fe19e | 2014-06-04 16:11:46 -0700 | [diff] [blame] | 211 | console_loglevel = CONSOLE_LOGLEVEL_QUIET; |
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. */ |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 238 | static int __init repair_env_string(char *param, char *val, |
| 239 | const char *unused, void *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | if (val) { |
| 242 | /* param=val or param="val"? */ |
| 243 | if (val == param+strlen(param)+1) |
| 244 | val[-1] = '='; |
| 245 | else if (val == param+strlen(param)+2) { |
| 246 | val[-2] = '='; |
| 247 | memmove(val-1, val, strlen(val)+1); |
| 248 | val--; |
| 249 | } else |
| 250 | BUG(); |
| 251 | } |
Chris Metcalf | a99cd11 | 2012-04-06 12:53:50 -0400 | [diff] [blame] | 252 | return 0; |
| 253 | } |
| 254 | |
Rusty Russell | 51e158c | 2014-04-28 11:34:33 +0930 | [diff] [blame] | 255 | /* Anything after -- gets handed straight to init. */ |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 256 | static int __init set_init_arg(char *param, char *val, |
| 257 | const char *unused, void *arg) |
Rusty Russell | 51e158c | 2014-04-28 11:34:33 +0930 | [diff] [blame] | 258 | { |
| 259 | unsigned int i; |
| 260 | |
| 261 | if (panic_later) |
| 262 | return 0; |
| 263 | |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 264 | repair_env_string(param, val, unused, NULL); |
Rusty Russell | 51e158c | 2014-04-28 11:34:33 +0930 | [diff] [blame] | 265 | |
| 266 | for (i = 0; argv_init[i]; i++) { |
| 267 | if (i == MAX_INIT_ARGS) { |
| 268 | panic_later = "init"; |
| 269 | panic_param = param; |
| 270 | return 0; |
| 271 | } |
| 272 | } |
| 273 | argv_init[i] = param; |
| 274 | return 0; |
| 275 | } |
| 276 | |
Chris Metcalf | a99cd11 | 2012-04-06 12:53:50 -0400 | [diff] [blame] | 277 | /* |
| 278 | * Unknown boot options get handed to init, unless they look like |
| 279 | * unused parameters (modprobe will find them in /proc/cmdline). |
| 280 | */ |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 281 | static int __init unknown_bootoption(char *param, char *val, |
| 282 | const char *unused, void *arg) |
Chris Metcalf | a99cd11 | 2012-04-06 12:53:50 -0400 | [diff] [blame] | 283 | { |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 284 | repair_env_string(param, val, unused, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | |
| 286 | /* Handle obsolete-style parameters */ |
| 287 | if (obsolete_checksetup(param)) |
| 288 | return 0; |
| 289 | |
Rusty Russell | f066a4f | 2009-12-01 14:56:44 +1030 | [diff] [blame] | 290 | /* Unused module parameter. */ |
| 291 | if (strchr(param, '.') && (!val || strchr(param, '.') < val)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | |
| 294 | if (panic_later) |
| 295 | return 0; |
| 296 | |
| 297 | if (val) { |
| 298 | /* Environment option */ |
| 299 | unsigned int i; |
| 300 | for (i = 0; envp_init[i]; i++) { |
| 301 | if (i == MAX_INIT_ENVS) { |
Tetsuo Handa | 499a458 | 2014-01-23 15:54:56 -0800 | [diff] [blame] | 302 | panic_later = "env"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | panic_param = param; |
| 304 | } |
| 305 | if (!strncmp(param, envp_init[i], val - param)) |
| 306 | break; |
| 307 | } |
| 308 | envp_init[i] = param; |
| 309 | } else { |
| 310 | /* Command line option */ |
| 311 | unsigned int i; |
| 312 | for (i = 0; argv_init[i]; i++) { |
| 313 | if (i == MAX_INIT_ARGS) { |
Tetsuo Handa | 499a458 | 2014-01-23 15:54:56 -0800 | [diff] [blame] | 314 | panic_later = "init"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | panic_param = param; |
| 316 | } |
| 317 | } |
| 318 | argv_init[i] = param; |
| 319 | } |
| 320 | return 0; |
| 321 | } |
| 322 | |
| 323 | static int __init init_setup(char *str) |
| 324 | { |
| 325 | unsigned int i; |
| 326 | |
| 327 | execute_command = str; |
| 328 | /* |
| 329 | * In case LILO is going to boot us with default command line, |
| 330 | * it prepends "auto" before the whole cmdline which makes |
| 331 | * the shell think it should execute a script with such name. |
| 332 | * So we ignore all arguments entered _before_ init=... [MJ] |
| 333 | */ |
| 334 | for (i = 1; i < MAX_INIT_ARGS; i++) |
| 335 | argv_init[i] = NULL; |
| 336 | return 1; |
| 337 | } |
| 338 | __setup("init=", init_setup); |
| 339 | |
Olof Johansson | ffdfc40 | 2005-09-06 15:17:19 -0700 | [diff] [blame] | 340 | static int __init rdinit_setup(char *str) |
| 341 | { |
| 342 | unsigned int i; |
| 343 | |
| 344 | ramdisk_execute_command = str; |
| 345 | /* See "auto" comment in init_setup */ |
| 346 | for (i = 1; i < MAX_INIT_ARGS; i++) |
| 347 | argv_init[i] = NULL; |
| 348 | return 1; |
| 349 | } |
| 350 | __setup("rdinit=", rdinit_setup); |
| 351 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | #ifndef CONFIG_SMP |
Amerigo Wang | 34db18a0 | 2011-03-22 16:34:06 -0700 | [diff] [blame] | 353 | static const unsigned int setup_max_cpus = NR_CPUS; |
Mike Travis | e0982e9 | 2008-03-26 14:23:48 -0700 | [diff] [blame] | 354 | static inline void setup_nr_cpu_ids(void) { } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | static inline void smp_prepare_cpus(unsigned int maxcpus) { } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | #endif |
| 357 | |
| 358 | /* |
Alon Bar-Lev | 30d7e0d | 2007-02-12 00:53:52 -0800 | [diff] [blame] | 359 | * We need to store the untouched command line for future reference. |
| 360 | * We also need to store the touched command line since the parameter |
| 361 | * parsing is performed in place, and we should allow a component to |
| 362 | * store reference of name/value for future reference. |
| 363 | */ |
| 364 | static void __init setup_command_line(char *command_line) |
| 365 | { |
Santosh Shilimkar | 098b081 | 2014-01-21 15:50:21 -0800 | [diff] [blame] | 366 | saved_command_line = |
| 367 | memblock_virt_alloc(strlen(boot_command_line) + 1, 0); |
| 368 | initcall_command_line = |
| 369 | memblock_virt_alloc(strlen(boot_command_line) + 1, 0); |
| 370 | static_command_line = memblock_virt_alloc(strlen(command_line) + 1, 0); |
Fabian Frederick | dd4d9fe | 2014-08-08 14:23:44 -0700 | [diff] [blame] | 371 | strcpy(saved_command_line, boot_command_line); |
| 372 | strcpy(static_command_line, command_line); |
Alon Bar-Lev | 30d7e0d | 2007-02-12 00:53:52 -0800 | [diff] [blame] | 373 | } |
| 374 | |
| 375 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | * We need to finalize in a non-__init function or else race conditions |
| 377 | * between the root thread and the init thread may cause start_kernel to |
| 378 | * be reaped by free_initmem before the root thread has proceeded to |
| 379 | * cpu_idle. |
| 380 | * |
| 381 | * gcc-3.4 accidentally inlines this function, so use noinline. |
| 382 | */ |
| 383 | |
Peter Zijlstra | b433c3d | 2010-06-28 16:51:01 +0200 | [diff] [blame] | 384 | static __initdata DECLARE_COMPLETION(kthreadd_done); |
| 385 | |
Rakib Mullick | f99ebf0 | 2009-01-06 14:40:38 -0800 | [diff] [blame] | 386 | static noinline void __init_refok rest_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | { |
Eric W. Biederman | 73c2799 | 2007-05-09 02:34:32 -0700 | [diff] [blame] | 388 | int pid; |
| 389 | |
Paul E. McKenney | 7db905e | 2009-09-02 14:01:24 -0700 | [diff] [blame] | 390 | rcu_scheduler_starting(); |
Paul E. McKenney | 00df35f | 2015-04-12 08:06:55 -0700 | [diff] [blame] | 391 | smpboot_thread_init(); |
Peter Zijlstra | b433c3d | 2010-06-28 16:51:01 +0200 | [diff] [blame] | 392 | /* |
Peter Zijlstra | 9715856 | 2010-06-30 10:37:11 +0200 | [diff] [blame] | 393 | * 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] | 394 | * the init task will end up wanting to create kthreads, which, if |
| 395 | * we schedule it before we create kthreadd, will OOPS. |
| 396 | */ |
Oleg Nesterov | 34a1b72 | 2014-06-04 16:12:19 -0700 | [diff] [blame] | 397 | kernel_thread(kernel_init, NULL, CLONE_FS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | numa_default_policy(); |
Eric W. Biederman | 73c2799 | 2007-05-09 02:34:32 -0700 | [diff] [blame] | 399 | pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); |
Paul E. McKenney | d11c563 | 2010-02-22 17:04:50 -0800 | [diff] [blame] | 400 | rcu_read_lock(); |
Pavel Emelyanov | 5cd2045 | 2008-04-30 00:54:24 -0700 | [diff] [blame] | 401 | kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); |
Paul E. McKenney | d11c563 | 2010-02-22 17:04:50 -0800 | [diff] [blame] | 402 | rcu_read_unlock(); |
Peter Zijlstra | b433c3d | 2010-06-28 16:51:01 +0200 | [diff] [blame] | 403 | complete(&kthreadd_done); |
Ingo Molnar | f340c0d | 2005-06-28 16:40:42 +0200 | [diff] [blame] | 404 | |
| 405 | /* |
| 406 | * The boot idle thread must execute schedule() |
Ingo Molnar | 1df2105 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 407 | * at least once to get things moving: |
Ingo Molnar | f340c0d | 2005-06-28 16:40:42 +0200 | [diff] [blame] | 408 | */ |
Ingo Molnar | 1df2105 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 409 | init_idle_bootup_task(current); |
Thomas Gleixner | bd2f553 | 2011-03-21 12:33:18 +0100 | [diff] [blame] | 410 | schedule_preempt_disabled(); |
Nick Piggin | 5bfb5d6 | 2005-11-08 21:39:01 -0800 | [diff] [blame] | 411 | /* Call into cpu_idle with preempt disabled */ |
Thomas Gleixner | a1a04ec | 2013-03-21 22:49:34 +0100 | [diff] [blame] | 412 | cpu_startup_entry(CPUHP_ONLINE); |
Ingo Molnar | 1df2105 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 413 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | |
| 415 | /* Check for early params. */ |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 416 | static int __init do_early_param(char *param, char *val, |
| 417 | const char *unused, void *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | { |
Rusty Russell | 914dcaa | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 419 | const struct obs_kernel_param *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | |
| 421 | for (p = __setup_start; p < __setup_end; p++) { |
Michal Schmidt | b1e4d20 | 2011-10-10 00:03:37 +0200 | [diff] [blame] | 422 | if ((p->early && parameq(param, p->str)) || |
Yinghai Lu | 18a8bd9 | 2007-07-15 23:37:59 -0700 | [diff] [blame] | 423 | (strcmp(param, "console") == 0 && |
| 424 | strcmp(p->str, "earlycon") == 0) |
| 425 | ) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | if (p->setup_func(val) != 0) |
Andrew Morton | ea676e8 | 2013-04-29 16:18:20 -0700 | [diff] [blame] | 427 | pr_warn("Malformed early option '%s'\n", param); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | } |
| 429 | } |
| 430 | /* We accept everything at this stage. */ |
| 431 | return 0; |
| 432 | } |
| 433 | |
Magnus Damm | 1397709 | 2009-03-30 14:37:25 -0700 | [diff] [blame] | 434 | void __init parse_early_options(char *cmdline) |
| 435 | { |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 436 | parse_args("early options", cmdline, NULL, 0, 0, 0, NULL, |
| 437 | do_early_param); |
Magnus Damm | 1397709 | 2009-03-30 14:37:25 -0700 | [diff] [blame] | 438 | } |
| 439 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | /* Arch code calls this early on, or if not, just before other parsing. */ |
| 441 | void __init parse_early_param(void) |
| 442 | { |
Fabian Frederick | dd4d9fe | 2014-08-08 14:23:44 -0700 | [diff] [blame] | 443 | static int done __initdata; |
| 444 | static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | |
| 446 | if (done) |
| 447 | return; |
| 448 | |
| 449 | /* All fall through to do_early_param. */ |
Alon Bar-Lev | 30d7e0d | 2007-02-12 00:53:52 -0800 | [diff] [blame] | 450 | strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); |
Magnus Damm | 1397709 | 2009-03-30 14:37:25 -0700 | [diff] [blame] | 451 | parse_early_options(tmp_cmdline); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | done = 1; |
| 453 | } |
| 454 | |
Benjamin Herrenschmidt | 839ad62 | 2008-04-18 16:56:18 +1000 | [diff] [blame] | 455 | void __init __weak smp_setup_processor_id(void) |
Andrew Morton | 033ab7f | 2006-06-30 01:55:50 -0700 | [diff] [blame] | 456 | { |
| 457 | } |
| 458 | |
David Howells | eded09c | 2012-11-02 13:20:42 +0000 | [diff] [blame] | 459 | # if THREAD_SIZE >= PAGE_SIZE |
Benjamin Herrenschmidt | 8c9843e | 2008-04-18 16:56:15 +1000 | [diff] [blame] | 460 | void __init __weak thread_info_cache_init(void) |
| 461 | { |
| 462 | } |
David Howells | eded09c | 2012-11-02 13:20:42 +0000 | [diff] [blame] | 463 | #endif |
Benjamin Herrenschmidt | 8c9843e | 2008-04-18 16:56:15 +1000 | [diff] [blame] | 464 | |
Pekka Enberg | 444f478 | 2009-06-11 18:29:06 +0300 | [diff] [blame] | 465 | /* |
| 466 | * Set up kernel memory allocators |
| 467 | */ |
| 468 | static void __init mm_init(void) |
| 469 | { |
Joonsoo Kim | eefa864b | 2014-12-12 16:55:46 -0800 | [diff] [blame] | 470 | /* |
| 471 | * page_ext requires contiguous pages, |
| 472 | * bigger than MAX_ORDER unless SPARSEMEM. |
| 473 | */ |
| 474 | page_ext_init_flatmem(); |
Pekka Enberg | 444f478 | 2009-06-11 18:29:06 +0300 | [diff] [blame] | 475 | mem_init(); |
| 476 | kmem_cache_init(); |
Tejun Heo | 099a19d | 2010-06-27 18:50:00 +0200 | [diff] [blame] | 477 | percpu_init_late(); |
Kirill A. Shutemov | b35f181 | 2014-01-21 15:49:07 -0800 | [diff] [blame] | 478 | pgtable_init(); |
Pekka Enberg | 444f478 | 2009-06-11 18:29:06 +0300 | [diff] [blame] | 479 | vmalloc_init(); |
Toshi Kani | 0ddab1d | 2015-04-14 15:47:20 -0700 | [diff] [blame] | 480 | ioremap_huge_init(); |
Pekka Enberg | 444f478 | 2009-06-11 18:29:06 +0300 | [diff] [blame] | 481 | } |
| 482 | |
Andi Kleen | 722a9f9 | 2014-05-02 00:44:38 +0200 | [diff] [blame] | 483 | asmlinkage __visible void __init start_kernel(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | { |
Fabian Frederick | dd4d9fe | 2014-08-08 14:23:44 -0700 | [diff] [blame] | 485 | char *command_line; |
| 486 | char *after_dashes; |
Andrew Morton | 033ab7f | 2006-06-30 01:55:50 -0700 | [diff] [blame] | 487 | |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 488 | /* |
| 489 | * Need to run as early as possible, to initialize the |
| 490 | * lockdep hash: |
| 491 | */ |
| 492 | lockdep_init(); |
Aaron Tomlin | d4311ff | 2014-09-12 14:16:17 +0100 | [diff] [blame] | 493 | set_task_stack_end_magic(&init_task); |
Ming Lei | 73839c5 | 2011-11-17 13:34:31 +0800 | [diff] [blame] | 494 | smp_setup_processor_id(); |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 495 | debug_objects_early_init(); |
Ingo Molnar | 4205942 | 2008-02-14 09:44:08 +0100 | [diff] [blame] | 496 | |
| 497 | /* |
| 498 | * Set up the the initial canary ASAP: |
| 499 | */ |
| 500 | boot_init_stack_canary(); |
| 501 | |
Paul Menage | ddbcc7e | 2007-10-18 23:39:30 -0700 | [diff] [blame] | 502 | cgroup_init_early(); |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 503 | |
| 504 | local_irq_disable(); |
Tejun Heo | 2ce802f | 2011-01-20 12:06:35 +0100 | [diff] [blame] | 505 | early_boot_irqs_disabled = true; |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 506 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | /* |
| 508 | * Interrupts are still disabled. Do necessary setups, then |
| 509 | * enable them |
| 510 | */ |
Stas Sergeev | 44fd229 | 2006-03-23 02:59:44 -0800 | [diff] [blame] | 511 | boot_cpu_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | page_address_init(); |
Andrew Morton | ea676e8 | 2013-04-29 16:18:20 -0700 | [diff] [blame] | 513 | pr_notice("%s", linux_banner); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | setup_arch(&command_line); |
Linus Torvalds | 6345d24 | 2011-05-29 11:32:28 -0700 | [diff] [blame] | 515 | mm_init_cpumask(&init_mm); |
Alon Bar-Lev | 30d7e0d | 2007-02-12 00:53:52 -0800 | [diff] [blame] | 516 | setup_command_line(command_line); |
Mike Travis | e0982e9 | 2008-03-26 14:23:48 -0700 | [diff] [blame] | 517 | setup_nr_cpu_ids(); |
Tejun Heo | d6647bd | 2009-07-21 17:11:50 +0900 | [diff] [blame] | 518 | setup_per_cpu_areas(); |
Thomas Gleixner | cff7d37 | 2016-02-26 18:43:28 +0000 | [diff] [blame^] | 519 | boot_cpu_state_init(); |
Stas Sergeev | 44fd229 | 2006-03-23 02:59:44 -0800 | [diff] [blame] | 520 | smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | |
Jiang Liu | 9adb62a | 2012-07-31 16:43:28 -0700 | [diff] [blame] | 522 | build_all_zonelists(NULL, NULL); |
Pekka Enberg | 83b519e | 2009-06-10 19:40:04 +0300 | [diff] [blame] | 523 | page_alloc_init(); |
| 524 | |
Andrew Morton | ea676e8 | 2013-04-29 16:18:20 -0700 | [diff] [blame] | 525 | pr_notice("Kernel command line: %s\n", boot_command_line); |
Pekka Enberg | 83b519e | 2009-06-10 19:40:04 +0300 | [diff] [blame] | 526 | parse_early_param(); |
Rusty Russell | 51e158c | 2014-04-28 11:34:33 +0930 | [diff] [blame] | 527 | after_dashes = parse_args("Booting kernel", |
| 528 | static_command_line, __start___param, |
| 529 | __stop___param - __start___param, |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 530 | -1, -1, NULL, &unknown_bootoption); |
Daniel Thompson | 3438cf5 | 2014-11-11 16:29:46 +1030 | [diff] [blame] | 531 | if (!IS_ERR_OR_NULL(after_dashes)) |
Rusty Russell | 51e158c | 2014-04-28 11:34:33 +0930 | [diff] [blame] | 532 | parse_args("Setting init args", after_dashes, NULL, 0, -1, -1, |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 533 | NULL, set_init_arg); |
Jeremy Fitzhardinge | 97ce2c8 | 2011-10-12 16:17:54 -0700 | [diff] [blame] | 534 | |
| 535 | jump_label_init(); |
| 536 | |
Pekka Enberg | 83b519e | 2009-06-10 19:40:04 +0300 | [diff] [blame] | 537 | /* |
| 538 | * These use large bootmem allocations and must precede |
| 539 | * kmem_cache_init() |
| 540 | */ |
Mike Travis | 162a7e7 | 2011-05-24 17:13:20 -0700 | [diff] [blame] | 541 | setup_log_buf(0); |
Pekka Enberg | 83b519e | 2009-06-10 19:40:04 +0300 | [diff] [blame] | 542 | pidhash_init(); |
Pekka Enberg | 83b519e | 2009-06-10 19:40:04 +0300 | [diff] [blame] | 543 | vfs_caches_init_early(); |
| 544 | sort_main_extable(); |
| 545 | trap_init(); |
Pekka Enberg | 444f478 | 2009-06-11 18:29:06 +0300 | [diff] [blame] | 546 | mm_init(); |
KOSAKI Motohiro | de03c72 | 2011-05-24 17:12:15 -0700 | [diff] [blame] | 547 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | /* |
| 549 | * Set up the scheduler prior starting any interrupts (such as the |
| 550 | * timer interrupt). Full topology setup happens at smp_init() |
| 551 | * time - but meanwhile we still have a functioning scheduler. |
| 552 | */ |
| 553 | sched_init(); |
| 554 | /* |
| 555 | * Disable preemption - early bootup scheduling is extremely |
| 556 | * fragile until we cpu_idle() for the first time. |
| 557 | */ |
| 558 | preempt_disable(); |
Fabian Frederick | dd4d9fe | 2014-08-08 14:23:44 -0700 | [diff] [blame] | 559 | if (WARN(!irqs_disabled(), |
| 560 | "Interrupts were enabled *very* early, fixing it\n")) |
Ard van Breemen | c4a6830 | 2007-01-05 16:36:19 -0800 | [diff] [blame] | 561 | local_irq_disable(); |
Peter Zijlstra | 9f58a20 | 2010-11-17 23:17:35 +0100 | [diff] [blame] | 562 | idr_init_cache(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | rcu_init(); |
Steven Rostedt (Red Hat) | 5f893b2 | 2014-12-12 20:05:10 -0500 | [diff] [blame] | 564 | |
| 565 | /* trace_printk() and trace points may be used after this */ |
| 566 | trace_init(); |
| 567 | |
Frederic Weisbecker | 65f382f | 2013-07-11 19:12:32 +0200 | [diff] [blame] | 568 | context_tracking_init(); |
Yinghai Lu | 773e3eb | 2010-02-10 01:20:33 -0800 | [diff] [blame] | 569 | radix_tree_init(); |
Yinghai Lu | 0b8f1ef | 2008-12-05 18:58:31 -0800 | [diff] [blame] | 570 | /* init some links before init_ISA_irqs() */ |
| 571 | early_irq_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | init_IRQ(); |
Thomas Gleixner | ad2b135 | 2013-03-05 15:14:05 +0100 | [diff] [blame] | 573 | tick_init(); |
Linus Torvalds | d6dd50e | 2014-10-13 15:44:12 +0200 | [diff] [blame] | 574 | rcu_init_nohz(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | init_timers(); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 576 | hrtimers_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | softirq_init(); |
john stultz | ad59617 | 2006-06-26 00:25:06 -0700 | [diff] [blame] | 578 | timekeeping_init(); |
john stultz | 88fecaa | 2006-07-03 00:24:04 -0700 | [diff] [blame] | 579 | time_init(); |
Stephen Boyd | 38ff87f | 2013-06-01 23:39:40 -0700 | [diff] [blame] | 580 | sched_clock_postinit(); |
Stephane Eranian | 9e63020 | 2013-04-03 14:21:33 +0200 | [diff] [blame] | 581 | perf_event_init(); |
Heiko Carstens | 93e0281 | 2006-07-03 00:24:24 -0700 | [diff] [blame] | 582 | profile_init(); |
Takao Indoh | d8ad7d1 | 2011-03-29 12:35:04 -0400 | [diff] [blame] | 583 | call_function_init(); |
Steven Rostedt | f91eb62 | 2013-04-29 16:18:18 -0700 | [diff] [blame] | 584 | WARN(!irqs_disabled(), "Interrupts were enabled early\n"); |
Tejun Heo | 2ce802f | 2011-01-20 12:06:35 +0100 | [diff] [blame] | 585 | early_boot_irqs_disabled = false; |
Heiko Carstens | 93e0281 | 2006-07-03 00:24:24 -0700 | [diff] [blame] | 586 | local_irq_enable(); |
Benjamin Herrenschmidt | dcce284 | 2009-06-18 13:24:12 +1000 | [diff] [blame] | 587 | |
Pekka Enberg | 7e85ee0 | 2009-06-12 14:03:06 +0300 | [diff] [blame] | 588 | kmem_cache_init_late(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | |
| 590 | /* |
| 591 | * HACK ALERT! This is early. We're enabling the console before |
| 592 | * we've done PCI setups etc, and console_init() must be aware of |
| 593 | * this. But we do want output early, in case something goes wrong. |
| 594 | */ |
| 595 | console_init(); |
| 596 | if (panic_later) |
Tetsuo Handa | 499a458 | 2014-01-23 15:54:56 -0800 | [diff] [blame] | 597 | panic("Too many boot %s vars at `%s'", panic_later, |
| 598 | panic_param); |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 599 | |
| 600 | lockdep_info(); |
| 601 | |
Ingo Molnar | 9a11b49a | 2006-07-03 00:24:33 -0700 | [diff] [blame] | 602 | /* |
| 603 | * Need to run this when irqs are enabled, because it wants |
| 604 | * to self-test [hard/soft]-irqs on/off lock inversion bugs |
| 605 | * too: |
| 606 | */ |
| 607 | locking_selftest(); |
| 608 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | #ifdef CONFIG_BLK_DEV_INITRD |
| 610 | if (initrd_start && !initrd_below_start_ok && |
Geert Uytterhoeven | bd673c7 | 2008-07-29 22:33:36 -0700 | [diff] [blame] | 611 | page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { |
Andrew Morton | ea676e8 | 2013-04-29 16:18:20 -0700 | [diff] [blame] | 612 | pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n", |
Geert Uytterhoeven | bd673c7 | 2008-07-29 22:33:36 -0700 | [diff] [blame] | 613 | page_to_pfn(virt_to_page((void *)initrd_start)), |
| 614 | min_low_pfn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | initrd_start = 0; |
| 616 | } |
| 617 | #endif |
Joonsoo Kim | eefa864b | 2014-12-12 16:55:46 -0800 | [diff] [blame] | 618 | page_ext_init(); |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 619 | debug_objects_mem_init(); |
Catalin Marinas | 9b090f2 | 2011-05-19 16:25:30 +0100 | [diff] [blame] | 620 | kmemleak_init(); |
Christoph Lameter | e7c8d5c | 2005-06-21 17:14:47 -0700 | [diff] [blame] | 621 | setup_per_cpu_pageset(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | numa_policy_init(); |
| 623 | if (late_time_init) |
| 624 | late_time_init(); |
Thomas Gleixner | fa84e9e | 2009-08-21 22:01:12 +0200 | [diff] [blame] | 625 | sched_clock_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | calibrate_delay(); |
| 627 | pidmap_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | anon_vma_init(); |
Rafael J. Wysocki | c4e1acb | 2014-03-13 00:22:58 +0100 | [diff] [blame] | 629 | acpi_early_init(); |
Linus Torvalds | 11520e5 | 2012-12-15 15:15:24 -0800 | [diff] [blame] | 630 | #ifdef CONFIG_X86 |
Matt Fleming | 83e6818 | 2012-11-14 09:42:35 +0000 | [diff] [blame] | 631 | if (efi_enabled(EFI_RUNTIME_SERVICES)) |
Linus Torvalds | 11520e5 | 2012-12-15 15:15:24 -0800 | [diff] [blame] | 632 | efi_enter_virtual_mode(); |
| 633 | #endif |
H. Peter Anvin | 197725d | 2014-05-04 10:00:49 -0700 | [diff] [blame] | 634 | #ifdef CONFIG_X86_ESPFIX64 |
H. Peter Anvin | 3891a04 | 2014-04-29 16:46:09 -0700 | [diff] [blame] | 635 | /* Should be run before the first non-init thread is created */ |
| 636 | init_espfix_bsp(); |
| 637 | #endif |
Benjamin Herrenschmidt | 8c9843e | 2008-04-18 16:56:15 +1000 | [diff] [blame] | 638 | thread_info_cache_init(); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 639 | cred_init(); |
Heinrich Schuchardt | ff691f6 | 2015-04-16 12:47:44 -0700 | [diff] [blame] | 640 | fork_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | proc_caches_init(); |
| 642 | buffer_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | key_init(); |
| 644 | security_init(); |
Jason Wessel | 0b4b382 | 2010-05-20 21:04:29 -0500 | [diff] [blame] | 645 | dbg_late_init(); |
Mel Gorman | 4248b0d | 2015-08-06 15:46:20 -0700 | [diff] [blame] | 646 | vfs_caches_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | signals_init(); |
| 648 | /* rootfs populating might need page-writeback */ |
| 649 | page_writeback_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | proc_root_init(); |
Al Viro | e149ed2 | 2014-11-01 10:57:28 -0400 | [diff] [blame] | 651 | nsfs_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | cpuset_init(); |
Zefan Li | 695df21 | 2015-03-04 17:09:33 +0800 | [diff] [blame] | 653 | cgroup_init(); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 654 | taskstats_init_early(); |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 655 | delayacct_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | |
| 657 | check_bugs(); |
| 658 | |
Rafael J. Wysocki | b064a8f | 2015-06-10 01:33:36 +0200 | [diff] [blame] | 659 | acpi_subsystem_init(); |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 660 | sfi_init_late(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | |
Matt Fleming | 83e6818 | 2012-11-14 09:42:35 +0000 | [diff] [blame] | 662 | if (efi_enabled(EFI_RUNTIME_SERVICES)) { |
Josh Triplett | 2223af3 | 2012-09-28 17:57:05 -0700 | [diff] [blame] | 663 | efi_late_init(); |
Josh Triplett | 7851079 | 2012-09-28 17:55:44 -0700 | [diff] [blame] | 664 | efi_free_boot_services(); |
Josh Triplett | 2223af3 | 2012-09-28 17:57:05 -0700 | [diff] [blame] | 665 | } |
Josh Triplett | 7851079 | 2012-09-28 17:55:44 -0700 | [diff] [blame] | 666 | |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 667 | ftrace_init(); |
| 668 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | /* Do the rest non-__init'ed, we're now alive */ |
| 670 | rest_init(); |
| 671 | } |
| 672 | |
Peter Oberparleiter | b99b87f | 2009-06-17 16:28:03 -0700 | [diff] [blame] | 673 | /* Call all constructor functions linked into the kernel. */ |
| 674 | static void __init do_ctors(void) |
| 675 | { |
| 676 | #ifdef CONFIG_CONSTRUCTORS |
H Hartley Sweeten | 196a15b | 2009-12-14 18:00:18 -0800 | [diff] [blame] | 677 | ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; |
Peter Oberparleiter | b99b87f | 2009-06-17 16:28:03 -0700 | [diff] [blame] | 678 | |
H Hartley Sweeten | 196a15b | 2009-12-14 18:00:18 -0800 | [diff] [blame] | 679 | for (; fn < (ctor_fn_t *) __ctors_end; fn++) |
| 680 | (*fn)(); |
Peter Oberparleiter | b99b87f | 2009-06-17 16:28:03 -0700 | [diff] [blame] | 681 | #endif |
| 682 | } |
| 683 | |
Rusty Russell | 2329abf | 2012-01-13 09:32:18 +1030 | [diff] [blame] | 684 | bool initcall_debug; |
Rusty Russell | d0ea3d7 | 2008-10-22 10:00:23 -0500 | [diff] [blame] | 685 | core_param(initcall_debug, initcall_debug, bool, 0644); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | |
Prarit Bhargava | 7b0b73d | 2014-06-04 16:12:17 -0700 | [diff] [blame] | 687 | #ifdef CONFIG_KALLSYMS |
| 688 | struct blacklist_entry { |
| 689 | struct list_head next; |
| 690 | char *buf; |
| 691 | }; |
| 692 | |
| 693 | static __initdata_or_module LIST_HEAD(blacklisted_initcalls); |
| 694 | |
| 695 | static int __init initcall_blacklist(char *str) |
| 696 | { |
| 697 | char *str_entry; |
| 698 | struct blacklist_entry *entry; |
| 699 | |
| 700 | /* str argument is a comma-separated list of functions */ |
| 701 | do { |
| 702 | str_entry = strsep(&str, ","); |
| 703 | if (str_entry) { |
| 704 | pr_debug("blacklisting initcall %s\n", str_entry); |
| 705 | entry = alloc_bootmem(sizeof(*entry)); |
| 706 | entry->buf = alloc_bootmem(strlen(str_entry) + 1); |
| 707 | strcpy(entry->buf, str_entry); |
| 708 | list_add(&entry->next, &blacklisted_initcalls); |
| 709 | } |
| 710 | } while (str_entry); |
| 711 | |
| 712 | return 0; |
| 713 | } |
| 714 | |
| 715 | static bool __init_or_module initcall_blacklisted(initcall_t fn) |
| 716 | { |
| 717 | struct list_head *tmp; |
| 718 | struct blacklist_entry *entry; |
| 719 | char *fn_name; |
| 720 | |
| 721 | fn_name = kasprintf(GFP_KERNEL, "%pf", fn); |
| 722 | if (!fn_name) |
| 723 | return false; |
| 724 | |
| 725 | list_for_each(tmp, &blacklisted_initcalls) { |
| 726 | entry = list_entry(tmp, struct blacklist_entry, next); |
| 727 | if (!strcmp(fn_name, entry->buf)) { |
| 728 | pr_debug("initcall %s blacklisted\n", fn_name); |
| 729 | kfree(fn_name); |
| 730 | return true; |
| 731 | } |
| 732 | } |
| 733 | |
| 734 | kfree(fn_name); |
| 735 | return false; |
| 736 | } |
| 737 | #else |
| 738 | static int __init initcall_blacklist(char *str) |
| 739 | { |
| 740 | pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n"); |
| 741 | return 0; |
| 742 | } |
| 743 | |
| 744 | static bool __init_or_module initcall_blacklisted(initcall_t fn) |
| 745 | { |
| 746 | return false; |
| 747 | } |
| 748 | #endif |
| 749 | __setup("initcall_blacklist=", initcall_blacklist); |
| 750 | |
Kevin Winchester | e446127 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 751 | static int __init_or_module do_one_initcall_debug(initcall_t fn) |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 752 | { |
Frederic Weisbecker | 7423907 | 2008-11-11 23:24:42 +0100 | [diff] [blame] | 753 | ktime_t calltime, delta, rettime; |
Américo Wang | 30dbb20e | 2010-05-26 18:57:53 +0800 | [diff] [blame] | 754 | unsigned long long duration; |
| 755 | int ret; |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 756 | |
Andrew Morton | d62cf81 | 2014-06-04 16:12:16 -0700 | [diff] [blame] | 757 | printk(KERN_DEBUG "calling %pF @ %i\n", fn, task_pid_nr(current)); |
Kevin Winchester | 22c5c03 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 758 | calltime = ktime_get(); |
Américo Wang | 30dbb20e | 2010-05-26 18:57:53 +0800 | [diff] [blame] | 759 | ret = fn(); |
Kevin Winchester | 22c5c03 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 760 | rettime = ktime_get(); |
| 761 | delta = ktime_sub(rettime, calltime); |
| 762 | duration = (unsigned long long) ktime_to_ns(delta) >> 10; |
Andrew Morton | d62cf81 | 2014-06-04 16:12:16 -0700 | [diff] [blame] | 763 | printk(KERN_DEBUG "initcall %pF returned %d after %lld usecs\n", |
Andrew Morton | ea676e8 | 2013-04-29 16:18:20 -0700 | [diff] [blame] | 764 | fn, ret, duration); |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 765 | |
Kevin Winchester | 22c5c03 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 766 | return ret; |
| 767 | } |
| 768 | |
Kevin Winchester | e446127 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 769 | int __init_or_module do_one_initcall(initcall_t fn) |
Kevin Winchester | 22c5c03 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 770 | { |
| 771 | int count = preempt_count(); |
| 772 | int ret; |
Steven Rostedt | ff1c8fa | 2013-07-03 15:05:37 -0700 | [diff] [blame] | 773 | char msgbuf[64]; |
Kevin Winchester | 22c5c03 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 774 | |
Prarit Bhargava | 7b0b73d | 2014-06-04 16:12:17 -0700 | [diff] [blame] | 775 | if (initcall_blacklisted(fn)) |
| 776 | return -EPERM; |
| 777 | |
Kevin Winchester | 22c5c03 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 778 | if (initcall_debug) |
| 779 | ret = do_one_initcall_debug(fn); |
| 780 | else |
| 781 | ret = fn(); |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 782 | |
| 783 | msgbuf[0] = 0; |
| 784 | |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 785 | if (preempt_count() != count) { |
Steven Rostedt | bf5d770 | 2013-05-01 13:35:51 -0400 | [diff] [blame] | 786 | sprintf(msgbuf, "preemption imbalance "); |
Peter Zijlstra | 4a2b4b2 | 2013-08-14 14:55:24 +0200 | [diff] [blame] | 787 | preempt_count_set(count); |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 788 | } |
| 789 | if (irqs_disabled()) { |
Cyrill Gorcunov | a76bfd0 | 2008-05-15 13:52:41 -0700 | [diff] [blame] | 790 | strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 791 | local_irq_enable(); |
| 792 | } |
Steven Rostedt | f91eb62 | 2013-04-29 16:18:18 -0700 | [diff] [blame] | 793 | 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] | 794 | |
Américo Wang | 30dbb20e | 2010-05-26 18:57:53 +0800 | [diff] [blame] | 795 | return ret; |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 796 | } |
| 797 | |
| 798 | |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 799 | extern initcall_t __initcall_start[]; |
| 800 | extern initcall_t __initcall0_start[]; |
| 801 | extern initcall_t __initcall1_start[]; |
| 802 | extern initcall_t __initcall2_start[]; |
| 803 | extern initcall_t __initcall3_start[]; |
| 804 | extern initcall_t __initcall4_start[]; |
| 805 | extern initcall_t __initcall5_start[]; |
| 806 | extern initcall_t __initcall6_start[]; |
| 807 | extern initcall_t __initcall7_start[]; |
| 808 | extern initcall_t __initcall_end[]; |
| 809 | |
| 810 | static initcall_t *initcall_levels[] __initdata = { |
| 811 | __initcall0_start, |
| 812 | __initcall1_start, |
| 813 | __initcall2_start, |
| 814 | __initcall3_start, |
| 815 | __initcall4_start, |
| 816 | __initcall5_start, |
| 817 | __initcall6_start, |
| 818 | __initcall7_start, |
| 819 | __initcall_end, |
| 820 | }; |
| 821 | |
Jim Cromie | 96263d2 | 2012-06-14 16:00:59 -0600 | [diff] [blame] | 822 | /* Keep these in sync with initcalls in include/linux/init.h */ |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 823 | static char *initcall_level_names[] __initdata = { |
Jim Cromie | 9fb48c7 | 2012-04-27 14:30:34 -0600 | [diff] [blame] | 824 | "early", |
| 825 | "core", |
| 826 | "postcore", |
| 827 | "arch", |
| 828 | "subsys", |
| 829 | "fs", |
| 830 | "device", |
| 831 | "late", |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 832 | }; |
| 833 | |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 834 | static void __init do_initcall_level(int level) |
| 835 | { |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 836 | initcall_t *fn; |
| 837 | |
Krzysztof Mazur | 08746a6 | 2013-10-31 13:45:39 +1030 | [diff] [blame] | 838 | strcpy(initcall_command_line, saved_command_line); |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 839 | parse_args(initcall_level_names[level], |
Krzysztof Mazur | 08746a6 | 2013-10-31 13:45:39 +1030 | [diff] [blame] | 840 | initcall_command_line, __start___param, |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 841 | __stop___param - __start___param, |
| 842 | level, level, |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 843 | NULL, &repair_env_string); |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 844 | |
| 845 | for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++) |
| 846 | do_one_initcall(*fn); |
| 847 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | |
| 849 | static void __init do_initcalls(void) |
| 850 | { |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 851 | int level; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | |
Borislav Petkov | 19efb72 | 2012-06-01 18:56:00 +0200 | [diff] [blame] | 853 | for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 854 | do_initcall_level(level); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | } |
| 856 | |
| 857 | /* |
| 858 | * Ok, the machine is now initialized. None of the devices |
| 859 | * have been touched yet, but the CPU subsystem is up and |
| 860 | * running, and memory and process management works. |
| 861 | * |
| 862 | * Now we can finally start doing some real work.. |
| 863 | */ |
| 864 | static void __init do_basic_setup(void) |
| 865 | { |
Lai Jiangshan | 759ee09 | 2009-03-25 17:06:30 +0800 | [diff] [blame] | 866 | cpuset_init_smp(); |
Hugh Dickins | 41ffe5d | 2011-08-03 16:21:21 -0700 | [diff] [blame] | 867 | shmem_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | driver_init(); |
Eric W. Biederman | b04c3af | 2007-02-14 00:33:57 -0800 | [diff] [blame] | 869 | init_irq_proc(); |
Peter Oberparleiter | b99b87f | 2009-06-17 16:28:03 -0700 | [diff] [blame] | 870 | do_ctors(); |
Linus Torvalds | d5767c5 | 2011-09-28 10:23:44 -0700 | [diff] [blame] | 871 | usermodehelper_enable(); |
wangyanqing | b0f8437 | 2011-09-29 15:09:40 +0800 | [diff] [blame] | 872 | do_initcalls(); |
Theodore Ts'o | 47d06e5 | 2013-09-10 10:52:35 -0400 | [diff] [blame] | 873 | random_int_secret_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | } |
| 875 | |
Eduard - Gabriel Munteanu | 7babe8d | 2008-07-25 19:45:11 -0700 | [diff] [blame] | 876 | static void __init do_pre_smp_initcalls(void) |
Eduard - Gabriel Munteanu | c2147a5 | 2008-07-25 19:45:11 -0700 | [diff] [blame] | 877 | { |
H Hartley Sweeten | 196a15b | 2009-12-14 18:00:18 -0800 | [diff] [blame] | 878 | initcall_t *fn; |
Eduard - Gabriel Munteanu | c2147a5 | 2008-07-25 19:45:11 -0700 | [diff] [blame] | 879 | |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 880 | for (fn = __initcall_start; fn < __initcall0_start; fn++) |
H Hartley Sweeten | 196a15b | 2009-12-14 18:00:18 -0800 | [diff] [blame] | 881 | do_one_initcall(*fn); |
Eduard - Gabriel Munteanu | c2147a5 | 2008-07-25 19:45:11 -0700 | [diff] [blame] | 882 | } |
| 883 | |
Tejun Heo | bb813f4 | 2013-01-18 14:05:56 -0800 | [diff] [blame] | 884 | /* |
| 885 | * This function requests modules which should be loaded by default and is |
| 886 | * called twice right after initrd is mounted and right before init is |
| 887 | * exec'd. If such modules are on either initrd or rootfs, they will be |
| 888 | * loaded before control is passed to userland. |
| 889 | */ |
| 890 | void __init load_default_modules(void) |
| 891 | { |
| 892 | load_default_elevator_module(); |
| 893 | } |
| 894 | |
Al Viro | a74fb73 | 2012-10-10 21:28:25 -0400 | [diff] [blame] | 895 | static int run_init_process(const char *init_filename) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | { |
| 897 | argv_init[0] = init_filename; |
Linus Torvalds | c4ad8f9 | 2014-02-05 12:54:53 -0800 | [diff] [blame] | 898 | return do_execve(getname_kernel(init_filename), |
Al Viro | ae903ca | 2012-12-14 12:44:11 -0500 | [diff] [blame] | 899 | (const char __user *const __user *)argv_init, |
| 900 | (const char __user *const __user *)envp_init); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | } |
| 902 | |
Michael Opdenacker | ba24762 | 2013-11-12 15:10:21 -0800 | [diff] [blame] | 903 | static int try_to_run_init_process(const char *init_filename) |
| 904 | { |
| 905 | int ret; |
| 906 | |
| 907 | ret = run_init_process(init_filename); |
| 908 | |
| 909 | if (ret && ret != -ENOENT) { |
| 910 | pr_err("Starting init: %s exists but couldn't execute it (error %d)\n", |
| 911 | init_filename, ret); |
| 912 | } |
| 913 | |
| 914 | return ret; |
| 915 | } |
| 916 | |
Vineet Gupta | f80b0c9 | 2012-12-21 12:25:44 +0530 | [diff] [blame] | 917 | static noinline void __init kernel_init_freeable(void); |
Al Viro | d6b2123 | 2012-10-10 19:57:26 -0400 | [diff] [blame] | 918 | |
| 919 | static int __ref kernel_init(void *unused) |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 920 | { |
Michael Opdenacker | ba24762 | 2013-11-12 15:10:21 -0800 | [diff] [blame] | 921 | int ret; |
| 922 | |
Al Viro | d6b2123 | 2012-10-10 19:57:26 -0400 | [diff] [blame] | 923 | kernel_init_freeable(); |
Arjan van de Ven | 22a9d64 | 2009-01-07 08:45:46 -0800 | [diff] [blame] | 924 | /* need to finish all async __init code before freeing the memory */ |
| 925 | async_synchronize_full(); |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 926 | free_initmem(); |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 927 | mark_rodata_ro(); |
| 928 | system_state = SYSTEM_RUNNING; |
| 929 | numa_default_policy(); |
| 930 | |
Al Viro | 4a9d4b0 | 2012-06-24 09:56:45 +0400 | [diff] [blame] | 931 | flush_delayed_fput(); |
Oleg Nesterov | fae5fa4 | 2008-04-30 00:53:03 -0700 | [diff] [blame] | 932 | |
Paul E. McKenney | 967dcb8 | 2015-11-25 16:52:36 -0800 | [diff] [blame] | 933 | rcu_end_inkernel_boot(); |
| 934 | |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 935 | if (ramdisk_execute_command) { |
Michael Opdenacker | ba24762 | 2013-11-12 15:10:21 -0800 | [diff] [blame] | 936 | ret = run_init_process(ramdisk_execute_command); |
| 937 | if (!ret) |
Al Viro | a74fb73 | 2012-10-10 21:28:25 -0400 | [diff] [blame] | 938 | return 0; |
Michael Opdenacker | ba24762 | 2013-11-12 15:10:21 -0800 | [diff] [blame] | 939 | pr_err("Failed to execute %s (error %d)\n", |
| 940 | ramdisk_execute_command, ret); |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 941 | } |
| 942 | |
| 943 | /* |
| 944 | * We try each of these until one succeeds. |
| 945 | * |
| 946 | * The Bourne shell can be used instead of init if we are |
| 947 | * trying to recover a really broken machine. |
| 948 | */ |
| 949 | if (execute_command) { |
Michael Opdenacker | ba24762 | 2013-11-12 15:10:21 -0800 | [diff] [blame] | 950 | ret = run_init_process(execute_command); |
| 951 | if (!ret) |
Al Viro | a74fb73 | 2012-10-10 21:28:25 -0400 | [diff] [blame] | 952 | return 0; |
Andy Lutomirski | 6ef4536 | 2014-12-10 15:52:19 -0800 | [diff] [blame] | 953 | panic("Requested init %s failed (error %d).", |
| 954 | execute_command, ret); |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 955 | } |
Michael Opdenacker | ba24762 | 2013-11-12 15:10:21 -0800 | [diff] [blame] | 956 | if (!try_to_run_init_process("/sbin/init") || |
| 957 | !try_to_run_init_process("/etc/init") || |
| 958 | !try_to_run_init_process("/bin/init") || |
| 959 | !try_to_run_init_process("/bin/sh")) |
Al Viro | a74fb73 | 2012-10-10 21:28:25 -0400 | [diff] [blame] | 960 | return 0; |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 961 | |
Michael Opdenacker | ba24762 | 2013-11-12 15:10:21 -0800 | [diff] [blame] | 962 | panic("No working init found. Try passing init= option to kernel. " |
Andreas Mohr | 9a85b8d | 2010-03-05 13:42:39 -0800 | [diff] [blame] | 963 | "See Linux Documentation/init.txt for guidance."); |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 964 | } |
| 965 | |
Vineet Gupta | f80b0c9 | 2012-12-21 12:25:44 +0530 | [diff] [blame] | 966 | static noinline void __init kernel_init_freeable(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | { |
Peter Zijlstra | b433c3d | 2010-06-28 16:51:01 +0200 | [diff] [blame] | 968 | /* |
| 969 | * Wait until kthreadd is all set-up. |
| 970 | */ |
| 971 | wait_for_completion(&kthreadd_done); |
Linus Torvalds | 31a6710 | 2012-05-21 12:52:42 -0700 | [diff] [blame] | 972 | |
| 973 | /* Now the scheduler is fully set up and can do blocking allocations */ |
| 974 | gfp_allowed_mask = __GFP_BITS_MASK; |
| 975 | |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 976 | /* |
| 977 | * init can allocate pages on any node |
| 978 | */ |
Lai Jiangshan | 3c466d4 | 2012-12-12 13:51:40 -0800 | [diff] [blame] | 979 | set_mems_allowed(node_states[N_MEMORY]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | /* |
| 981 | * init can run on any cpu. |
| 982 | */ |
Rusty Russell | 1a2142a | 2009-03-30 22:05:10 -0600 | [diff] [blame] | 983 | set_cpus_allowed_ptr(current, cpu_all_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | |
Cedric Le Goater | 9ec5209 | 2006-10-02 02:19:00 -0700 | [diff] [blame] | 985 | cad_pid = task_pid(current); |
| 986 | |
Andi Kleen | ca74a6f | 2008-01-30 13:33:17 +0100 | [diff] [blame] | 987 | smp_prepare_cpus(setup_max_cpus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | |
| 989 | do_pre_smp_initcalls(); |
Peter Zijlstra | 004417a | 2010-11-25 18:38:29 +0100 | [diff] [blame] | 990 | lockup_detector_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | smp_init(); |
| 993 | sched_init_smp(); |
| 994 | |
Mel Gorman | 0e1cc95 | 2015-06-30 14:57:27 -0700 | [diff] [blame] | 995 | page_alloc_init_late(); |
| 996 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | do_basic_setup(); |
| 998 | |
Eric W. Biederman | 2bd3a997 | 2010-03-02 23:53:19 -0800 | [diff] [blame] | 999 | /* Open the /dev/console on the rootfs, this should never fail */ |
| 1000 | if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0) |
Andrew Morton | ea676e8 | 2013-04-29 16:18:20 -0700 | [diff] [blame] | 1001 | pr_err("Warning: unable to open an initial console.\n"); |
Eric W. Biederman | 2bd3a997 | 2010-03-02 23:53:19 -0800 | [diff] [blame] | 1002 | |
| 1003 | (void) sys_dup(0); |
| 1004 | (void) sys_dup(0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | /* |
| 1006 | * check if there is an early userspace init. If yes, let it do all |
| 1007 | * the work |
| 1008 | */ |
Olof Johansson | ffdfc40 | 2005-09-06 15:17:19 -0700 | [diff] [blame] | 1009 | |
| 1010 | if (!ramdisk_execute_command) |
| 1011 | ramdisk_execute_command = "/init"; |
| 1012 | |
| 1013 | if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) { |
| 1014 | ramdisk_execute_command = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | prepare_namespace(); |
Olof Johansson | ffdfc40 | 2005-09-06 15:17:19 -0700 | [diff] [blame] | 1016 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1017 | |
| 1018 | /* |
| 1019 | * Ok, we have completed the initial bootup, and |
| 1020 | * we're essentially up and running. Get rid of the |
| 1021 | * initmem segments and start the user-mode stuff.. |
Dmitry Kasatkin | c9cd2ce | 2014-11-05 17:01:15 +0200 | [diff] [blame] | 1022 | * |
| 1023 | * rootfs is available now, try loading the public keys |
| 1024 | * and default modules |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | */ |
Tejun Heo | bb813f4 | 2013-01-18 14:05:56 -0800 | [diff] [blame] | 1026 | |
Dmitry Kasatkin | c9cd2ce | 2014-11-05 17:01:15 +0200 | [diff] [blame] | 1027 | integrity_load_keys(); |
Tejun Heo | bb813f4 | 2013-01-18 14:05:56 -0800 | [diff] [blame] | 1028 | load_default_modules(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | } |