Commit | Line | Data |
---|---|---|
457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * linux/init/main.c | |
4 | * | |
5 | * Copyright (C) 1991, 1992 Linus Torvalds | |
6 | * | |
7 | * GK 2/5/95 - Changed to support mounting root fs via NFS | |
8 | * Added initrd & change_root: Werner Almesberger & Hans Lermen, Feb '96 | |
9 | * Moan early if gcc is old, avoiding bogus kernels - Paul Gortmaker, May '96 | |
dd4d9fec | 10 | * Simplified starting of init: Michael A. Griffith <grif@acm.org> |
1da177e4 LT |
11 | */ |
12 | ||
ea676e84 AM |
13 | #define DEBUG /* Enable initcall_debug */ |
14 | ||
1da177e4 | 15 | #include <linux/types.h> |
8a293be0 | 16 | #include <linux/extable.h> |
1da177e4 LT |
17 | #include <linux/module.h> |
18 | #include <linux/proc_fs.h> | |
5c2c5c55 | 19 | #include <linux/binfmts.h> |
1da177e4 LT |
20 | #include <linux/kernel.h> |
21 | #include <linux/syscalls.h> | |
9b5609fd | 22 | #include <linux/stackprotector.h> |
1da177e4 LT |
23 | #include <linux/string.h> |
24 | #include <linux/ctype.h> | |
25 | #include <linux/delay.h> | |
1da177e4 LT |
26 | #include <linux/ioport.h> |
27 | #include <linux/init.h> | |
1da177e4 | 28 | #include <linux/initrd.h> |
57c8a661 | 29 | #include <linux/memblock.h> |
4a7a16dc | 30 | #include <linux/acpi.h> |
7684b858 | 31 | #include <linux/bootconfig.h> |
0c688614 | 32 | #include <linux/console.h> |
38b8d208 | 33 | #include <linux/nmi.h> |
1da177e4 LT |
34 | #include <linux/percpu.h> |
35 | #include <linux/kmod.h> | |
82d083ab | 36 | #include <linux/kprobes.h> |
3c206509 | 37 | #include <linux/kmsan.h> |
db64fe02 | 38 | #include <linux/vmalloc.h> |
1da177e4 | 39 | #include <linux/kernel_stat.h> |
d7cd5611 | 40 | #include <linux/start_kernel.h> |
1da177e4 | 41 | #include <linux/security.h> |
3d442233 | 42 | #include <linux/smp.h> |
1da177e4 | 43 | #include <linux/profile.h> |
0ce20dd8 | 44 | #include <linux/kfence.h> |
1da177e4 | 45 | #include <linux/rcupdate.h> |
8e9c01c7 | 46 | #include <linux/srcu.h> |
1da177e4 LT |
47 | #include <linux/moduleparam.h> |
48 | #include <linux/kallsyms.h> | |
83cc6fa0 | 49 | #include <linux/buildid.h> |
1da177e4 LT |
50 | #include <linux/writeback.h> |
51 | #include <linux/cpu.h> | |
52 | #include <linux/cpuset.h> | |
ddbcc7e8 | 53 | #include <linux/cgroup.h> |
1da177e4 | 54 | #include <linux/efi.h> |
906568c9 | 55 | #include <linux/tick.h> |
78634061 | 56 | #include <linux/sched/isolation.h> |
6168a702 | 57 | #include <linux/interrupt.h> |
c757249a | 58 | #include <linux/taskstats_kern.h> |
ca74e92b | 59 | #include <linux/delayacct.h> |
1da177e4 | 60 | #include <linux/unistd.h> |
3ea056c5 | 61 | #include <linux/utsname.h> |
1da177e4 LT |
62 | #include <linux/rmap.h> |
63 | #include <linux/mempolicy.h> | |
64 | #include <linux/key.h> | |
9a11b49a | 65 | #include <linux/debug_locks.h> |
3ac7fe5a | 66 | #include <linux/debugobjects.h> |
fbb9ce95 | 67 | #include <linux/lockdep.h> |
3c7b4e6b | 68 | #include <linux/kmemleak.h> |
f1b192b1 | 69 | #include <linux/padata.h> |
84d73786 | 70 | #include <linux/pid_namespace.h> |
4c002c97 | 71 | #include <linux/device/driver.h> |
73c27992 | 72 | #include <linux/kthread.h> |
e6fe6649 | 73 | #include <linux/sched.h> |
1777e463 | 74 | #include <linux/sched/init.h> |
a1c9eea9 | 75 | #include <linux/signal.h> |
199f0ca5 | 76 | #include <linux/idr.h> |
0b4b3827 | 77 | #include <linux/kgdb.h> |
68bf21aa | 78 | #include <linux/ftrace.h> |
22a9d645 | 79 | #include <linux/async.h> |
2b2af54a | 80 | #include <linux/shmem_fs.h> |
5a0e3ad6 | 81 | #include <linux/slab.h> |
24a24bb6 | 82 | #include <linux/perf_event.h> |
a74fb73c | 83 | #include <linux/ptrace.h> |
aa8c6248 | 84 | #include <linux/pti.h> |
bb813f4c | 85 | #include <linux/blkdev.h> |
5d2a4e91 | 86 | #include <linux/sched/clock.h> |
29930025 | 87 | #include <linux/sched/task.h> |
68db0cf1 | 88 | #include <linux/sched/task_stack.h> |
65f382fd | 89 | #include <linux/context_tracking.h> |
47d06e53 | 90 | #include <linux/random.h> |
7b0b73d7 | 91 | #include <linux/list.h> |
c9cd2ce2 | 92 | #include <linux/integrity.h> |
e149ed2b | 93 | #include <linux/proc_ns.h> |
0ddab1d2 | 94 | #include <linux/io.h> |
39290b38 | 95 | #include <linux/cache.h> |
2959a5f7 | 96 | #include <linux/rodata_test.h> |
33352244 | 97 | #include <linux/jump_label.h> |
dfd402a4 | 98 | #include <linux/kcsan.h> |
eb9d7d39 | 99 | #include <linux/init_syscalls.h> |
e1fdc403 | 100 | #include <linux/stackdepot.h> |
375561bd | 101 | #include <linux/randomize_kstack.h> |
9c1be193 | 102 | #include <net/net_namespace.h> |
1da177e4 LT |
103 | |
104 | #include <asm/io.h> | |
1da177e4 | 105 | #include <asm/setup.h> |
a940199f | 106 | #include <asm/sections.h> |
37b73c82 | 107 | #include <asm/cacheflush.h> |
1da177e4 | 108 | |
4ee7c60d SRV |
109 | #define CREATE_TRACE_POINTS |
110 | #include <trace/events/initcall.h> | |
111 | ||
8c0d8849 BH |
112 | #include <kunit/test.h> |
113 | ||
aae5f662 | 114 | static int kernel_init(void *); |
1da177e4 | 115 | |
2ce802f6 TH |
116 | /* |
117 | * Debug helper: via this flag we know that we are in 'early bootup code' | |
118 | * where only the boot processor is running with IRQ disabled. This means | |
119 | * two things - IRQ must not be enabled before the flag is cleared and some | |
120 | * operations which are not allowed with IRQ disabled are allowed while the | |
121 | * flag is set. | |
122 | */ | |
123 | bool early_boot_irqs_disabled __read_mostly; | |
124 | ||
a6826048 | 125 | enum system_states system_state __read_mostly; |
1da177e4 LT |
126 | EXPORT_SYMBOL(system_state); |
127 | ||
128 | /* | |
129 | * Boot command-line arguments | |
130 | */ | |
131 | #define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT | |
132 | #define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT | |
133 | ||
1da177e4 | 134 | /* Default late time init is NULL. archs can override this later. */ |
d2e3192b | 135 | void (*__initdata late_time_init)(void); |
1da177e4 | 136 | |
30d7e0d4 ABL |
137 | /* Untouched command line saved by arch-specific code. */ |
138 | char __initdata boot_command_line[COMMAND_LINE_SIZE]; | |
139 | /* Untouched saved command line (eg. for /proc) */ | |
941baf6f AD |
140 | char *saved_command_line __ro_after_init; |
141 | unsigned int saved_command_line_len __ro_after_init; | |
30d7e0d4 ABL |
142 | /* Command line for parameter parsing */ |
143 | static char *static_command_line; | |
51887d03 MH |
144 | /* Untouched extra command line */ |
145 | static char *extra_command_line; | |
13199162 MH |
146 | /* Extra init arguments */ |
147 | static char *extra_init_args; | |
1da177e4 | 148 | |
f61872bb SRV |
149 | #ifdef CONFIG_BOOT_CONFIG |
150 | /* Is bootconfig on command line? */ | |
caa0708a | 151 | static bool bootconfig_found; |
b66fbbe8 | 152 | static size_t initargs_offs; |
f61872bb SRV |
153 | #else |
154 | # define bootconfig_found false | |
b66fbbe8 | 155 | # define initargs_offs 0 |
f61872bb SRV |
156 | #endif |
157 | ||
1da177e4 | 158 | static char *execute_command; |
916db733 | 159 | static char *ramdisk_execute_command = "/init"; |
1da177e4 | 160 | |
c4b2c0c5 HFS |
161 | /* |
162 | * Used to generate warnings if static_key manipulation functions are used | |
163 | * before jump_label_init is called. | |
164 | */ | |
dd4d9fec | 165 | bool static_key_initialized __read_mostly; |
c4b2c0c5 HFS |
166 | EXPORT_SYMBOL_GPL(static_key_initialized); |
167 | ||
8b3b2955 JB |
168 | /* |
169 | * If set, this is an indication to the drivers that reset the underlying | |
170 | * device before going ahead with the initialization otherwise driver might | |
171 | * rely on the BIOS and skip the reset operation. | |
172 | * | |
173 | * This is useful if kernel is booting in an unreliable environment. | |
fc454fdc | 174 | * For ex. kdump situation where previous kernel has crashed, BIOS has been |
8b3b2955 JB |
175 | * skipped and devices will be in unknown state. |
176 | */ | |
177 | unsigned int reset_devices; | |
178 | EXPORT_SYMBOL(reset_devices); | |
1da177e4 | 179 | |
7e96287d VG |
180 | static int __init set_reset_devices(char *str) |
181 | { | |
182 | reset_devices = 1; | |
183 | return 1; | |
184 | } | |
185 | ||
186 | __setup("reset_devices", set_reset_devices); | |
187 | ||
dd4d9fec FF |
188 | static const char *argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; |
189 | const char *envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; | |
1da177e4 LT |
190 | static const char *panic_later, *panic_param; |
191 | ||
31c025b5 | 192 | static bool __init obsolete_checksetup(char *line) |
1da177e4 | 193 | { |
914dcaa8 | 194 | const struct obs_kernel_param *p; |
31c025b5 | 195 | bool had_early_param = false; |
1da177e4 LT |
196 | |
197 | p = __setup_start; | |
198 | do { | |
199 | int n = strlen(p->str); | |
b1e4d20c | 200 | if (parameqn(line, p->str, n)) { |
1da177e4 | 201 | if (p->early) { |
33df0d19 RR |
202 | /* Already done in parse_early_param? |
203 | * (Needs exact match on param part). | |
204 | * Keep iterating, as we can have early | |
205 | * params and __setups of same names 8( */ | |
1da177e4 | 206 | if (line[n] == '\0' || line[n] == '=') |
31c025b5 | 207 | had_early_param = true; |
1da177e4 | 208 | } else if (!p->setup_func) { |
ea676e84 AM |
209 | pr_warn("Parameter %s is obsolete, ignored\n", |
210 | p->str); | |
31c025b5 | 211 | return true; |
1da177e4 | 212 | } else if (p->setup_func(line + n)) |
31c025b5 | 213 | return true; |
1da177e4 LT |
214 | } |
215 | p++; | |
216 | } while (p < __setup_end); | |
33df0d19 RR |
217 | |
218 | return had_early_param; | |
1da177e4 LT |
219 | } |
220 | ||
221 | /* | |
222 | * This should be approx 2 Bo*oMips to start (note initial shift), and will | |
223 | * still work even if initially too large, it will just take slightly longer | |
224 | */ | |
225 | unsigned long loops_per_jiffy = (1<<12); | |
1da177e4 LT |
226 | EXPORT_SYMBOL(loops_per_jiffy); |
227 | ||
228 | static int __init debug_kernel(char *str) | |
229 | { | |
a8fe19eb | 230 | console_loglevel = CONSOLE_LOGLEVEL_DEBUG; |
f6f21c81 | 231 | return 0; |
1da177e4 LT |
232 | } |
233 | ||
234 | static int __init quiet_kernel(char *str) | |
235 | { | |
a8fe19eb | 236 | console_loglevel = CONSOLE_LOGLEVEL_QUIET; |
f6f21c81 | 237 | return 0; |
1da177e4 LT |
238 | } |
239 | ||
f6f21c81 YL |
240 | early_param("debug", debug_kernel); |
241 | early_param("quiet", quiet_kernel); | |
1da177e4 LT |
242 | |
243 | static int __init loglevel(char *str) | |
244 | { | |
808bf29b AS |
245 | int newlevel; |
246 | ||
247 | /* | |
248 | * Only update loglevel value when a correct setting was passed, | |
249 | * to prevent blind crashes (when loglevel being set to 0) that | |
250 | * are quite hard to debug | |
251 | */ | |
252 | if (get_option(&str, &newlevel)) { | |
253 | console_loglevel = newlevel; | |
254 | return 0; | |
255 | } | |
256 | ||
257 | return -EINVAL; | |
1da177e4 LT |
258 | } |
259 | ||
f6f21c81 | 260 | early_param("loglevel", loglevel); |
1da177e4 | 261 | |
de462e5f | 262 | #ifdef CONFIG_BLK_DEV_INITRD |
a2a9d67a | 263 | static void * __init get_boot_config_from_initrd(size_t *_size) |
de462e5f MH |
264 | { |
265 | u32 size, csum; | |
266 | char *data; | |
267 | u32 *hdr; | |
50b8a742 | 268 | int i; |
de462e5f MH |
269 | |
270 | if (!initrd_end) | |
271 | return NULL; | |
272 | ||
273 | data = (char *)initrd_end - BOOTCONFIG_MAGIC_LEN; | |
50b8a742 MH |
274 | /* |
275 | * Since Grub may align the size of initrd to 4, we must | |
276 | * check the preceding 3 bytes as well. | |
277 | */ | |
278 | for (i = 0; i < 4; i++) { | |
279 | if (!memcmp(data, BOOTCONFIG_MAGIC, BOOTCONFIG_MAGIC_LEN)) | |
280 | goto found; | |
281 | data--; | |
282 | } | |
283 | return NULL; | |
de462e5f | 284 | |
50b8a742 | 285 | found: |
de462e5f | 286 | hdr = (u32 *)(data - 8); |
24aed094 MH |
287 | size = le32_to_cpu(hdr[0]); |
288 | csum = le32_to_cpu(hdr[1]); | |
de462e5f MH |
289 | |
290 | data = ((void *)hdr) - size; | |
291 | if ((unsigned long)data < initrd_start) { | |
292 | pr_err("bootconfig size %d is greater than initrd size %ld\n", | |
293 | size, initrd_end - initrd_start); | |
294 | return NULL; | |
295 | } | |
296 | ||
765b8552 MH |
297 | if (xbc_calc_checksum(data, size) != csum) { |
298 | pr_err("bootconfig checksum failed\n"); | |
299 | return NULL; | |
300 | } | |
301 | ||
de462e5f MH |
302 | /* Remove bootconfig from initramfs/initrd */ |
303 | initrd_end = (unsigned long)data; | |
304 | if (_size) | |
305 | *_size = size; | |
de462e5f MH |
306 | |
307 | return data; | |
308 | } | |
309 | #else | |
a2a9d67a | 310 | static void * __init get_boot_config_from_initrd(size_t *_size) |
de462e5f MH |
311 | { |
312 | return NULL; | |
313 | } | |
314 | #endif | |
315 | ||
7684b858 | 316 | #ifdef CONFIG_BOOT_CONFIG |
51887d03 | 317 | |
a27026e9 | 318 | static char xbc_namebuf[XBC_KEYLEN_MAX] __initdata; |
51887d03 MH |
319 | |
320 | #define rest(dst, end) ((end) > (dst) ? (end) - (dst) : 0) | |
321 | ||
322 | static int __init xbc_snprint_cmdline(char *buf, size_t size, | |
323 | struct xbc_node *root) | |
324 | { | |
325 | struct xbc_node *knode, *vnode; | |
326 | char *end = buf + size; | |
51887d03 MH |
327 | const char *val; |
328 | int ret; | |
329 | ||
330 | xbc_node_for_each_key_value(root, knode, val) { | |
331 | ret = xbc_node_compose_key_after(root, knode, | |
332 | xbc_namebuf, XBC_KEYLEN_MAX); | |
333 | if (ret < 0) | |
334 | return ret; | |
335 | ||
336 | vnode = xbc_node_get_child(knode); | |
88b91371 MH |
337 | if (!vnode) { |
338 | ret = snprintf(buf, rest(buf, end), "%s ", xbc_namebuf); | |
339 | if (ret < 0) | |
340 | return ret; | |
341 | buf += ret; | |
51887d03 | 342 | continue; |
88b91371 | 343 | } |
51887d03 | 344 | xbc_array_for_each_value(vnode, val) { |
88b91371 MH |
345 | ret = snprintf(buf, rest(buf, end), "%s=\"%s\" ", |
346 | xbc_namebuf, val); | |
51887d03 MH |
347 | if (ret < 0) |
348 | return ret; | |
349 | buf += ret; | |
51887d03 | 350 | } |
51887d03 MH |
351 | } |
352 | ||
353 | return buf - (end - size); | |
354 | } | |
355 | #undef rest | |
356 | ||
357 | /* Make an extra command line under given key word */ | |
358 | static char * __init xbc_make_cmdline(const char *key) | |
359 | { | |
360 | struct xbc_node *root; | |
361 | char *new_cmdline; | |
362 | int ret, len = 0; | |
363 | ||
364 | root = xbc_find_node(key); | |
365 | if (!root) | |
366 | return NULL; | |
367 | ||
368 | /* Count required buffer size */ | |
369 | len = xbc_snprint_cmdline(NULL, 0, root); | |
370 | if (len <= 0) | |
371 | return NULL; | |
372 | ||
373 | new_cmdline = memblock_alloc(len + 1, SMP_CACHE_BYTES); | |
374 | if (!new_cmdline) { | |
375 | pr_err("Failed to allocate memory for extra kernel cmdline.\n"); | |
376 | return NULL; | |
377 | } | |
378 | ||
379 | ret = xbc_snprint_cmdline(new_cmdline, len + 1, root); | |
380 | if (ret < 0 || ret > len) { | |
381 | pr_err("Failed to print extra kernel cmdline.\n"); | |
4421cca0 | 382 | memblock_free(new_cmdline, len + 1); |
51887d03 MH |
383 | return NULL; |
384 | } | |
385 | ||
386 | return new_cmdline; | |
387 | } | |
388 | ||
f61872bb SRV |
389 | static int __init bootconfig_params(char *param, char *val, |
390 | const char *unused, void *arg) | |
391 | { | |
392 | if (strcmp(param, "bootconfig") == 0) { | |
393 | bootconfig_found = true; | |
f61872bb SRV |
394 | } |
395 | return 0; | |
396 | } | |
397 | ||
d0ac5fba MH |
398 | static int __init warn_bootconfig(char *str) |
399 | { | |
400 | /* The 'bootconfig' has been handled by bootconfig_params(). */ | |
401 | return 0; | |
402 | } | |
403 | ||
2b7d2fe7 | 404 | static void __init setup_boot_config(void) |
7684b858 | 405 | { |
f61872bb | 406 | static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata; |
a2a9d67a MH |
407 | const char *msg, *data; |
408 | int pos, ret; | |
409 | size_t size; | |
410 | char *err; | |
7684b858 | 411 | |
611d0a95 | 412 | /* Cut out the bootconfig data even if we have no bootconfig option */ |
765b8552 | 413 | data = get_boot_config_from_initrd(&size); |
a2a9d67a MH |
414 | /* If there is no bootconfig in initrd, try embedded one. */ |
415 | if (!data) | |
416 | data = xbc_get_embedded_bootconfig(&size); | |
de462e5f | 417 | |
a1d3a6d9 | 418 | strscpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); |
477d0847 MH |
419 | err = parse_args("bootconfig", tmp_cmdline, NULL, 0, 0, 0, NULL, |
420 | bootconfig_params); | |
f61872bb | 421 | |
caa0708a | 422 | if (IS_ERR(err) || !(bootconfig_found || IS_ENABLED(CONFIG_BOOT_CONFIG_FORCE))) |
7684b858 MH |
423 | return; |
424 | ||
b66fbbe8 | 425 | /* parse_args() stops at the next param of '--' and returns an address */ |
477d0847 | 426 | if (err) |
b66fbbe8 | 427 | initargs_offs = err - tmp_cmdline; |
477d0847 | 428 | |
611d0a95 | 429 | if (!data) { |
caa0708a MHG |
430 | /* If user intended to use bootconfig, show an error level message */ |
431 | if (bootconfig_found) | |
432 | pr_err("'bootconfig' found on command line, but no bootconfig found\n"); | |
433 | else | |
434 | pr_info("No bootconfig data provided, so skipping bootconfig"); | |
611d0a95 MH |
435 | return; |
436 | } | |
437 | ||
7495e092 | 438 | if (size >= XBC_DATA_MAX) { |
a2a9d67a MH |
439 | pr_err("bootconfig size %ld greater than max size %d\n", |
440 | (long)size, XBC_DATA_MAX); | |
7684b858 | 441 | return; |
7495e092 | 442 | } |
7684b858 | 443 | |
bdac5c2b | 444 | ret = xbc_init(data, size, &msg, &pos); |
89b74cac MH |
445 | if (ret < 0) { |
446 | if (pos < 0) | |
447 | pr_err("Failed to init bootconfig: %s.\n", msg); | |
448 | else | |
449 | pr_err("Failed to parse bootconfig: %s at %d.\n", | |
450 | msg, pos); | |
451 | } else { | |
e306220c | 452 | xbc_get_info(&ret, NULL); |
a2a9d67a | 453 | pr_info("Load bootconfig: %ld bytes %d nodes\n", (long)size, ret); |
51887d03 MH |
454 | /* keys starting with "kernel." are passed via cmdline */ |
455 | extra_command_line = xbc_make_cmdline("kernel"); | |
13199162 MH |
456 | /* Also, "init." keys are init arguments */ |
457 | extra_init_args = xbc_make_cmdline("init"); | |
51887d03 | 458 | } |
7495e092 | 459 | return; |
7684b858 | 460 | } |
de462e5f | 461 | |
40caa127 MH |
462 | static void __init exit_boot_config(void) |
463 | { | |
115d4d08 | 464 | xbc_exit(); |
40caa127 MH |
465 | } |
466 | ||
467 | #else /* !CONFIG_BOOT_CONFIG */ | |
de462e5f | 468 | |
2b7d2fe7 | 469 | static void __init setup_boot_config(void) |
de462e5f MH |
470 | { |
471 | /* Remove bootconfig data from initrd */ | |
765b8552 | 472 | get_boot_config_from_initrd(NULL); |
de462e5f | 473 | } |
d8a953dd MH |
474 | |
475 | static int __init warn_bootconfig(char *str) | |
476 | { | |
36c6aa26 | 477 | pr_warn("WARNING: 'bootconfig' found on the kernel command line but CONFIG_BOOT_CONFIG is not set.\n"); |
d8a953dd MH |
478 | return 0; |
479 | } | |
40caa127 MH |
480 | |
481 | #define exit_boot_config() do {} while (0) | |
482 | ||
483 | #endif /* CONFIG_BOOT_CONFIG */ | |
484 | ||
d0ac5fba | 485 | early_param("bootconfig", warn_bootconfig); |
7684b858 | 486 | |
a99cd112 | 487 | /* Change NUL term back to "=", to make "param" the whole string. */ |
7e2762e1 | 488 | static void __init repair_env_string(char *param, char *val) |
1da177e4 | 489 | { |
1da177e4 LT |
490 | if (val) { |
491 | /* param=val or param="val"? */ | |
492 | if (val == param+strlen(param)+1) | |
493 | val[-1] = '='; | |
494 | else if (val == param+strlen(param)+2) { | |
495 | val[-2] = '='; | |
496 | memmove(val-1, val, strlen(val)+1); | |
1da177e4 LT |
497 | } else |
498 | BUG(); | |
499 | } | |
a99cd112 CM |
500 | } |
501 | ||
51e158c1 | 502 | /* Anything after -- gets handed straight to init. */ |
ecc86170 LR |
503 | static int __init set_init_arg(char *param, char *val, |
504 | const char *unused, void *arg) | |
51e158c1 RR |
505 | { |
506 | unsigned int i; | |
507 | ||
508 | if (panic_later) | |
509 | return 0; | |
510 | ||
7e2762e1 | 511 | repair_env_string(param, val); |
51e158c1 RR |
512 | |
513 | for (i = 0; argv_init[i]; i++) { | |
514 | if (i == MAX_INIT_ARGS) { | |
515 | panic_later = "init"; | |
516 | panic_param = param; | |
517 | return 0; | |
518 | } | |
519 | } | |
520 | argv_init[i] = param; | |
521 | return 0; | |
522 | } | |
523 | ||
a99cd112 CM |
524 | /* |
525 | * Unknown boot options get handed to init, unless they look like | |
526 | * unused parameters (modprobe will find them in /proc/cmdline). | |
527 | */ | |
ecc86170 LR |
528 | static int __init unknown_bootoption(char *param, char *val, |
529 | const char *unused, void *arg) | |
a99cd112 | 530 | { |
283900e8 AS |
531 | size_t len = strlen(param); |
532 | ||
7e2762e1 | 533 | repair_env_string(param, val); |
1da177e4 LT |
534 | |
535 | /* Handle obsolete-style parameters */ | |
536 | if (obsolete_checksetup(param)) | |
537 | return 0; | |
538 | ||
f066a4f6 | 539 | /* Unused module parameter. */ |
283900e8 | 540 | if (strnchr(param, len, '.')) |
1da177e4 | 541 | return 0; |
1da177e4 LT |
542 | |
543 | if (panic_later) | |
544 | return 0; | |
545 | ||
546 | if (val) { | |
547 | /* Environment option */ | |
548 | unsigned int i; | |
549 | for (i = 0; envp_init[i]; i++) { | |
550 | if (i == MAX_INIT_ENVS) { | |
499a4584 | 551 | panic_later = "env"; |
1da177e4 LT |
552 | panic_param = param; |
553 | } | |
283900e8 | 554 | if (!strncmp(param, envp_init[i], len+1)) |
1da177e4 LT |
555 | break; |
556 | } | |
557 | envp_init[i] = param; | |
558 | } else { | |
559 | /* Command line option */ | |
560 | unsigned int i; | |
561 | for (i = 0; argv_init[i]; i++) { | |
562 | if (i == MAX_INIT_ARGS) { | |
499a4584 | 563 | panic_later = "init"; |
1da177e4 LT |
564 | panic_param = param; |
565 | } | |
566 | } | |
567 | argv_init[i] = param; | |
568 | } | |
569 | return 0; | |
570 | } | |
571 | ||
572 | static int __init init_setup(char *str) | |
573 | { | |
574 | unsigned int i; | |
575 | ||
576 | execute_command = str; | |
577 | /* | |
578 | * In case LILO is going to boot us with default command line, | |
579 | * it prepends "auto" before the whole cmdline which makes | |
580 | * the shell think it should execute a script with such name. | |
581 | * So we ignore all arguments entered _before_ init=... [MJ] | |
582 | */ | |
583 | for (i = 1; i < MAX_INIT_ARGS; i++) | |
584 | argv_init[i] = NULL; | |
585 | return 1; | |
586 | } | |
587 | __setup("init=", init_setup); | |
588 | ||
ffdfc409 OJ |
589 | static int __init rdinit_setup(char *str) |
590 | { | |
591 | unsigned int i; | |
592 | ||
593 | ramdisk_execute_command = str; | |
594 | /* See "auto" comment in init_setup */ | |
595 | for (i = 1; i < MAX_INIT_ARGS; i++) | |
596 | argv_init[i] = NULL; | |
597 | return 1; | |
598 | } | |
599 | __setup("rdinit=", rdinit_setup); | |
600 | ||
1da177e4 | 601 | #ifndef CONFIG_SMP |
34db18a0 | 602 | static const unsigned int setup_max_cpus = NR_CPUS; |
e0982e90 | 603 | static inline void setup_nr_cpu_ids(void) { } |
1da177e4 | 604 | static inline void smp_prepare_cpus(unsigned int maxcpus) { } |
1da177e4 LT |
605 | #endif |
606 | ||
30d7e0d4 ABL |
607 | /* |
608 | * We need to store the untouched command line for future reference. | |
609 | * We also need to store the touched command line since the parameter | |
610 | * parsing is performed in place, and we should allow a component to | |
611 | * store reference of name/value for future reference. | |
612 | */ | |
613 | static void __init setup_command_line(char *command_line) | |
614 | { | |
13199162 | 615 | size_t len, xlen = 0, ilen = 0; |
f5c7310a | 616 | |
51887d03 MH |
617 | if (extra_command_line) |
618 | xlen = strlen(extra_command_line); | |
13199162 MH |
619 | if (extra_init_args) |
620 | ilen = strlen(extra_init_args) + 4; /* for " -- " */ | |
f5c7310a | 621 | |
51887d03 | 622 | len = xlen + strlen(boot_command_line) + 1; |
f5c7310a | 623 | |
13199162 | 624 | saved_command_line = memblock_alloc(len + ilen, SMP_CACHE_BYTES); |
f5c7310a | 625 | if (!saved_command_line) |
13199162 | 626 | panic("%s: Failed to allocate %zu bytes\n", __func__, len + ilen); |
f5c7310a MR |
627 | |
628 | static_command_line = memblock_alloc(len, SMP_CACHE_BYTES); | |
629 | if (!static_command_line) | |
630 | panic("%s: Failed to allocate %zu bytes\n", __func__, len); | |
631 | ||
51887d03 MH |
632 | if (xlen) { |
633 | /* | |
634 | * We have to put extra_command_line before boot command | |
635 | * lines because there could be dashes (separator of init | |
636 | * command line) in the command lines. | |
637 | */ | |
638 | strcpy(saved_command_line, extra_command_line); | |
639 | strcpy(static_command_line, extra_command_line); | |
640 | } | |
641 | strcpy(saved_command_line + xlen, boot_command_line); | |
642 | strcpy(static_command_line + xlen, command_line); | |
13199162 MH |
643 | |
644 | if (ilen) { | |
645 | /* | |
646 | * Append supplemental init boot args to saved_command_line | |
647 | * so that user can check what command line options passed | |
648 | * to init. | |
b66fbbe8 MH |
649 | * The order should always be |
650 | * " -- "[bootconfig init-param][cmdline init-param] | |
13199162 | 651 | */ |
b66fbbe8 MH |
652 | if (initargs_offs) { |
653 | len = xlen + initargs_offs; | |
654 | strcpy(saved_command_line + len, extra_init_args); | |
655 | len += ilen - 4; /* strlen(extra_init_args) */ | |
656 | strcpy(saved_command_line + len, | |
657 | boot_command_line + initargs_offs - 1); | |
f61872bb | 658 | } else { |
b66fbbe8 | 659 | len = strlen(saved_command_line); |
13199162 MH |
660 | strcpy(saved_command_line + len, " -- "); |
661 | len += 4; | |
b66fbbe8 | 662 | strcpy(saved_command_line + len, extra_init_args); |
f61872bb | 663 | } |
13199162 | 664 | } |
941baf6f AD |
665 | |
666 | saved_command_line_len = strlen(saved_command_line); | |
30d7e0d4 ABL |
667 | } |
668 | ||
1da177e4 LT |
669 | /* |
670 | * We need to finalize in a non-__init function or else race conditions | |
671 | * between the root thread and the init thread may cause start_kernel to | |
672 | * be reaped by free_initmem before the root thread has proceeded to | |
673 | * cpu_idle. | |
674 | * | |
675 | * gcc-3.4 accidentally inlines this function, so use noinline. | |
676 | */ | |
677 | ||
b433c3d4 PZ |
678 | static __initdata DECLARE_COMPLETION(kthreadd_done); |
679 | ||
9ea7e6b6 | 680 | noinline void __ref __noreturn rest_init(void) |
1da177e4 | 681 | { |
8fb12156 | 682 | struct task_struct *tsk; |
73c27992 EB |
683 | int pid; |
684 | ||
7db905e6 | 685 | rcu_scheduler_starting(); |
b433c3d4 | 686 | /* |
97158569 | 687 | * We need to spawn init first so that it obtains pid 1, however |
b433c3d4 PZ |
688 | * the init task will end up wanting to create kthreads, which, if |
689 | * we schedule it before we create kthreadd, will OOPS. | |
690 | */ | |
343f4c49 | 691 | pid = user_mode_thread(kernel_init, NULL, CLONE_FS); |
8fb12156 TG |
692 | /* |
693 | * Pin init on the boot CPU. Task migration is not properly working | |
694 | * until sched_init_smp() has been run. It will set the allowed | |
695 | * CPUs for init to the non isolated CPUs. | |
696 | */ | |
697 | rcu_read_lock(); | |
698 | tsk = find_task_by_pid_ns(pid, &init_pid_ns); | |
15faafc6 | 699 | tsk->flags |= PF_NO_SETAFFINITY; |
8fb12156 TG |
700 | set_cpus_allowed_ptr(tsk, cpumask_of(smp_processor_id())); |
701 | rcu_read_unlock(); | |
702 | ||
1da177e4 | 703 | numa_default_policy(); |
cf587db2 | 704 | pid = kernel_thread(kthreadd, NULL, NULL, CLONE_FS | CLONE_FILES); |
d11c563d | 705 | rcu_read_lock(); |
5cd20455 | 706 | kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); |
d11c563d | 707 | rcu_read_unlock(); |
1c3c5eab TG |
708 | |
709 | /* | |
710 | * Enable might_sleep() and smp_processor_id() checks. | |
c1a280b6 | 711 | * They cannot be enabled earlier because with CONFIG_PREEMPTION=y |
1c3c5eab TG |
712 | * kernel_thread() would trigger might_sleep() splats. With |
713 | * CONFIG_PREEMPT_VOLUNTARY=y the init task might have scheduled | |
714 | * already, but it's stuck on the kthreadd_done completion. | |
715 | */ | |
716 | system_state = SYSTEM_SCHEDULING; | |
717 | ||
b433c3d4 | 718 | complete(&kthreadd_done); |
f340c0d1 IM |
719 | |
720 | /* | |
721 | * The boot idle thread must execute schedule() | |
1df21055 | 722 | * at least once to get things moving: |
f340c0d1 | 723 | */ |
bd2f5536 | 724 | schedule_preempt_disabled(); |
5bfb5d69 | 725 | /* Call into cpu_idle with preempt disabled */ |
a1a04ec3 | 726 | cpu_startup_entry(CPUHP_ONLINE); |
1df21055 | 727 | } |
1da177e4 LT |
728 | |
729 | /* Check for early params. */ | |
ecc86170 LR |
730 | static int __init do_early_param(char *param, char *val, |
731 | const char *unused, void *arg) | |
1da177e4 | 732 | { |
914dcaa8 | 733 | const struct obs_kernel_param *p; |
1da177e4 LT |
734 | |
735 | for (p = __setup_start; p < __setup_end; p++) { | |
b1e4d20c | 736 | if ((p->early && parameq(param, p->str)) || |
18a8bd94 YL |
737 | (strcmp(param, "console") == 0 && |
738 | strcmp(p->str, "earlycon") == 0) | |
739 | ) { | |
1da177e4 | 740 | if (p->setup_func(val) != 0) |
ea676e84 | 741 | pr_warn("Malformed early option '%s'\n", param); |
1da177e4 LT |
742 | } |
743 | } | |
744 | /* We accept everything at this stage. */ | |
745 | return 0; | |
746 | } | |
747 | ||
13977091 MD |
748 | void __init parse_early_options(char *cmdline) |
749 | { | |
ecc86170 LR |
750 | parse_args("early options", cmdline, NULL, 0, 0, 0, NULL, |
751 | do_early_param); | |
13977091 MD |
752 | } |
753 | ||
1da177e4 LT |
754 | /* Arch code calls this early on, or if not, just before other parsing. */ |
755 | void __init parse_early_param(void) | |
756 | { | |
dd4d9fec FF |
757 | static int done __initdata; |
758 | static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata; | |
1da177e4 LT |
759 | |
760 | if (done) | |
761 | return; | |
762 | ||
763 | /* All fall through to do_early_param. */ | |
a1d3a6d9 | 764 | strscpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); |
13977091 | 765 | parse_early_options(tmp_cmdline); |
1da177e4 LT |
766 | done = 1; |
767 | } | |
768 | ||
e7ff3a47 TG |
769 | void __init __weak arch_post_acpi_subsys_init(void) { } |
770 | ||
839ad62e | 771 | void __init __weak smp_setup_processor_id(void) |
033ab7f8 AM |
772 | { |
773 | } | |
774 | ||
eded09cc | 775 | # if THREAD_SIZE >= PAGE_SIZE |
b235beea | 776 | void __init __weak thread_stack_cache_init(void) |
8c9843e5 BH |
777 | { |
778 | } | |
eded09cc | 779 | #endif |
8c9843e5 | 780 | |
4fc19708 NA |
781 | void __init __weak poking_init(void) { } |
782 | ||
782de70c | 783 | void __init __weak pgtable_cache_init(void) { } |
caa84136 | 784 | |
8b097881 KW |
785 | void __init __weak trap_init(void) { } |
786 | ||
4e37958d SRV |
787 | bool initcall_debug; |
788 | core_param(initcall_debug, initcall_debug, bool, 0644); | |
b0dc52f1 SRV |
789 | |
790 | #ifdef TRACEPOINTS_ENABLED | |
4e37958d | 791 | static void __init initcall_debug_enable(void); |
b0dc52f1 SRV |
792 | #else |
793 | static inline void initcall_debug_enable(void) | |
794 | { | |
795 | } | |
796 | #endif | |
4e37958d | 797 | |
8cb37a59 | 798 | #ifdef CONFIG_RANDOMIZE_KSTACK_OFFSET |
39218ff4 KC |
799 | DEFINE_STATIC_KEY_MAYBE_RO(CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT, |
800 | randomize_kstack_offset); | |
801 | DEFINE_PER_CPU(u32, kstack_offset); | |
802 | ||
803 | static int __init early_randomize_kstack_offset(char *buf) | |
804 | { | |
805 | int ret; | |
806 | bool bool_result; | |
807 | ||
808 | ret = kstrtobool(buf, &bool_result); | |
809 | if (ret) | |
810 | return ret; | |
811 | ||
812 | if (bool_result) | |
813 | static_branch_enable(&randomize_kstack_offset); | |
814 | else | |
815 | static_branch_disable(&randomize_kstack_offset); | |
816 | return 0; | |
817 | } | |
818 | early_param("randomize_kstack_offset", early_randomize_kstack_offset); | |
819 | #endif | |
820 | ||
9ea7e6b6 | 821 | void __init __weak __noreturn arch_call_rest_init(void) |
53c99bd6 MS |
822 | { |
823 | rest_init(); | |
824 | } | |
825 | ||
86d1919a AH |
826 | static void __init print_unknown_bootoptions(void) |
827 | { | |
828 | char *unknown_options; | |
829 | char *end; | |
830 | const char *const *p; | |
831 | size_t len; | |
832 | ||
833 | if (panic_later || (!argv_init[1] && !envp_init[2])) | |
834 | return; | |
835 | ||
836 | /* | |
837 | * Determine how many options we have to print out, plus a space | |
838 | * before each | |
839 | */ | |
840 | len = 1; /* null terminator */ | |
841 | for (p = &argv_init[1]; *p; p++) { | |
842 | len++; | |
843 | len += strlen(*p); | |
844 | } | |
845 | for (p = &envp_init[2]; *p; p++) { | |
846 | len++; | |
847 | len += strlen(*p); | |
848 | } | |
849 | ||
850 | unknown_options = memblock_alloc(len, SMP_CACHE_BYTES); | |
851 | if (!unknown_options) { | |
852 | pr_err("%s: Failed to allocate %zu bytes\n", | |
853 | __func__, len); | |
854 | return; | |
855 | } | |
856 | end = unknown_options; | |
857 | ||
858 | for (p = &argv_init[1]; *p; p++) | |
859 | end += sprintf(end, " %s", *p); | |
860 | for (p = &envp_init[2]; *p; p++) | |
861 | end += sprintf(end, " %s", *p); | |
862 | ||
8bc2b3dc AH |
863 | /* Start at unknown_options[1] to skip the initial space */ |
864 | pr_notice("Unknown kernel command line parameters \"%s\", will be passed to user space.\n", | |
865 | &unknown_options[1]); | |
4421cca0 | 866 | memblock_free(unknown_options, len); |
86d1919a AH |
867 | } |
868 | ||
514ca14e | 869 | asmlinkage __visible __init __no_sanitize_address __noreturn __no_stack_protector |
870 | void start_kernel(void) | |
1da177e4 | 871 | { |
dd4d9fec FF |
872 | char *command_line; |
873 | char *after_dashes; | |
033ab7f8 | 874 | |
d4311ff1 | 875 | set_task_stack_end_magic(&init_task); |
73839c5b | 876 | smp_setup_processor_id(); |
3ac7fe5a | 877 | debug_objects_early_init(); |
83cc6fa0 | 878 | init_vmlinux_build_id(); |
42059429 | 879 | |
ddbcc7e8 | 880 | cgroup_init_early(); |
fbb9ce95 IM |
881 | |
882 | local_irq_disable(); | |
2ce802f6 | 883 | early_boot_irqs_disabled = true; |
fbb9ce95 | 884 | |
1b3b3b49 VK |
885 | /* |
886 | * Interrupts are still disabled. Do necessary setups, then | |
887 | * enable them. | |
888 | */ | |
44fd2299 | 889 | boot_cpu_init(); |
1da177e4 | 890 | page_address_init(); |
ea676e84 | 891 | pr_notice("%s", linux_banner); |
e6b1db98 | 892 | early_security_init(); |
1da177e4 | 893 | setup_arch(&command_line); |
2b7d2fe7 | 894 | setup_boot_config(); |
30d7e0d4 | 895 | setup_command_line(command_line); |
e0982e90 | 896 | setup_nr_cpu_ids(); |
d6647bdf | 897 | setup_per_cpu_areas(); |
44fd2299 | 898 | smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ |
b5b1404d | 899 | boot_cpu_hotplug_init(); |
1da177e4 | 900 | |
51887d03 | 901 | pr_notice("Kernel command line: %s\n", saved_command_line); |
6041186a DW |
902 | /* parameters may set static keys */ |
903 | jump_label_init(); | |
83b519e8 | 904 | parse_early_param(); |
51e158c1 RR |
905 | after_dashes = parse_args("Booting kernel", |
906 | static_command_line, __start___param, | |
907 | __stop___param - __start___param, | |
ecc86170 | 908 | -1, -1, NULL, &unknown_bootoption); |
86d1919a | 909 | print_unknown_bootoptions(); |
3438cf54 | 910 | if (!IS_ERR_OR_NULL(after_dashes)) |
51e158c1 | 911 | parse_args("Setting init args", after_dashes, NULL, 0, -1, -1, |
ecc86170 | 912 | NULL, set_init_arg); |
13199162 MH |
913 | if (extra_init_args) |
914 | parse_args("Setting extra init args", extra_init_args, | |
915 | NULL, 0, -1, -1, NULL, set_init_arg); | |
97ce2c88 | 916 | |
f6238499 JD |
917 | /* Architectural and non-timekeeping rng init, before allocator init */ |
918 | random_init_early(command_line); | |
919 | ||
83b519e8 PE |
920 | /* |
921 | * These use large bootmem allocations and must precede | |
b7ec1bf3 | 922 | * initalization of page allocator |
83b519e8 | 923 | */ |
162a7e75 | 924 | setup_log_buf(0); |
83b519e8 PE |
925 | vfs_caches_init_early(); |
926 | sort_main_extable(); | |
927 | trap_init(); | |
b7ec1bf3 | 928 | mm_core_init(); |
5b93a836 | 929 | poking_init(); |
f631718d SRV |
930 | ftrace_init(); |
931 | ||
e725c731 SRV |
932 | /* trace_printk can be enabled here */ |
933 | early_trace_init(); | |
934 | ||
1da177e4 LT |
935 | /* |
936 | * Set up the scheduler prior starting any interrupts (such as the | |
937 | * timer interrupt). Full topology setup happens at smp_init() | |
938 | * time - but meanwhile we still have a functioning scheduler. | |
939 | */ | |
940 | sched_init(); | |
f1a0a376 | 941 | |
dd4d9fec FF |
942 | if (WARN(!irqs_disabled(), |
943 | "Interrupts were enabled *very* early, fixing it\n")) | |
c4a68306 | 944 | local_irq_disable(); |
0a835c4f | 945 | radix_tree_init(); |
54a611b6 | 946 | maple_tree_init(); |
3347fa09 | 947 | |
7d229c66 TS |
948 | /* |
949 | * Set up housekeeping before setting up workqueues to allow the unbound | |
950 | * workqueue to take non-housekeeping into account. | |
951 | */ | |
952 | housekeeping_init(); | |
953 | ||
3347fa09 TH |
954 | /* |
955 | * Allow workqueue creation and work item queueing/cancelling | |
956 | * early. Work item execution depends on kthreads and starts after | |
957 | * workqueue_init(). | |
958 | */ | |
959 | workqueue_init_early(); | |
960 | ||
1da177e4 | 961 | rcu_init(); |
5f893b26 | 962 | |
e725c731 | 963 | /* Trace events are available after this */ |
5f893b26 SRRH |
964 | trace_init(); |
965 | ||
4e37958d SRV |
966 | if (initcall_debug) |
967 | initcall_debug_enable(); | |
968 | ||
65f382fd | 969 | context_tracking_init(); |
0b8f1efa YL |
970 | /* init some links before init_ISA_irqs() */ |
971 | early_irq_init(); | |
1da177e4 | 972 | init_IRQ(); |
ad2b1353 | 973 | tick_init(); |
d6dd50e0 | 974 | rcu_init_nohz(); |
1da177e4 | 975 | init_timers(); |
8e9c01c7 | 976 | srcu_init(); |
c0a31329 | 977 | hrtimers_init(); |
1da177e4 | 978 | softirq_init(); |
ad596171 | 979 | timekeeping_init(); |
fe222a6c | 980 | time_init(); |
d5553523 | 981 | |
f6238499 JD |
982 | /* This must be after timekeeping is initialized */ |
983 | random_init(); | |
984 | ||
985 | /* These make use of the fully initialized rng */ | |
986 | kfence_init(); | |
d5553523 KC |
987 | boot_init_stack_canary(); |
988 | ||
9e630205 | 989 | perf_event_init(); |
93e02814 | 990 | profile_init(); |
d8ad7d11 | 991 | call_function_init(); |
f91eb62f | 992 | WARN(!irqs_disabled(), "Interrupts were enabled early\n"); |
c3bc8fd6 | 993 | |
2ce802f6 | 994 | early_boot_irqs_disabled = false; |
93e02814 | 995 | local_irq_enable(); |
dcce284a | 996 | |
7e85ee0c | 997 | kmem_cache_init_late(); |
1da177e4 LT |
998 | |
999 | /* | |
1000 | * HACK ALERT! This is early. We're enabling the console before | |
1001 | * we've done PCI setups etc, and console_init() must be aware of | |
1002 | * this. But we do want output early, in case something goes wrong. | |
1003 | */ | |
1004 | console_init(); | |
1005 | if (panic_later) | |
499a4584 TH |
1006 | panic("Too many boot %s vars at `%s'", panic_later, |
1007 | panic_param); | |
fbb9ce95 | 1008 | |
c3bc8fd6 | 1009 | lockdep_init(); |
fbb9ce95 | 1010 | |
9a11b49a IM |
1011 | /* |
1012 | * Need to run this when irqs are enabled, because it wants | |
1013 | * to self-test [hard/soft]-irqs on/off lock inversion bugs | |
1014 | * too: | |
1015 | */ | |
1016 | locking_selftest(); | |
1017 | ||
1da177e4 LT |
1018 | #ifdef CONFIG_BLK_DEV_INITRD |
1019 | if (initrd_start && !initrd_below_start_ok && | |
bd673c7c | 1020 | page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { |
ea676e84 | 1021 | pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n", |
bd673c7c GU |
1022 | page_to_pfn(virt_to_page((void *)initrd_start)), |
1023 | min_low_pfn); | |
1da177e4 LT |
1024 | initrd_start = 0; |
1025 | } | |
1026 | #endif | |
e7c8d5c9 | 1027 | setup_per_cpu_pageset(); |
1da177e4 | 1028 | numa_policy_init(); |
9c71206d | 1029 | acpi_early_init(); |
1da177e4 LT |
1030 | if (late_time_init) |
1031 | late_time_init(); | |
857baa87 | 1032 | sched_clock_init(); |
1da177e4 | 1033 | calibrate_delay(); |
e45e761b | 1034 | |
9df9d2f0 TG |
1035 | arch_cpu_finalize_init(); |
1036 | ||
95846ecf | 1037 | pid_idr_init(); |
1da177e4 | 1038 | anon_vma_init(); |
11520e5e | 1039 | #ifdef CONFIG_X86 |
83e68189 | 1040 | if (efi_enabled(EFI_RUNTIME_SERVICES)) |
11520e5e LT |
1041 | efi_enter_virtual_mode(); |
1042 | #endif | |
b235beea | 1043 | thread_stack_cache_init(); |
d84f4f99 | 1044 | cred_init(); |
ff691f6e | 1045 | fork_init(); |
1da177e4 | 1046 | proc_caches_init(); |
3ea056c5 | 1047 | uts_ns_init(); |
1da177e4 LT |
1048 | key_init(); |
1049 | security_init(); | |
0b4b3827 | 1050 | dbg_late_init(); |
9c1be193 | 1051 | net_ns_init(); |
4248b0da | 1052 | vfs_caches_init(); |
62906027 | 1053 | pagecache_init(); |
1da177e4 | 1054 | signals_init(); |
09652320 | 1055 | seq_file_init(); |
1da177e4 | 1056 | proc_root_init(); |
e149ed2b | 1057 | nsfs_init(); |
1da177e4 | 1058 | cpuset_init(); |
695df213 | 1059 | cgroup_init(); |
c757249a | 1060 | taskstats_init_early(); |
ca74e92b | 1061 | delayacct_init(); |
1da177e4 | 1062 | |
b064a8fa | 1063 | acpi_subsystem_init(); |
e7ff3a47 | 1064 | arch_post_acpi_subsys_init(); |
dfd402a4 | 1065 | kcsan_init(); |
1da177e4 LT |
1066 | |
1067 | /* Do the rest non-__init'ed, we're now alive */ | |
53c99bd6 | 1068 | arch_call_rest_init(); |
a9a3ed1e | 1069 | |
dc1d0553 | 1070 | /* |
1071 | * Avoid stack canaries in callers of boot_init_stack_canary for gcc-10 | |
1072 | * and older. | |
1073 | */ | |
1074 | #if !__has_attribute(__no_stack_protector__) | |
a9a3ed1e | 1075 | prevent_tail_call_optimization(); |
dc1d0553 | 1076 | #endif |
1da177e4 LT |
1077 | } |
1078 | ||
b99b87f7 PO |
1079 | /* Call all constructor functions linked into the kernel. */ |
1080 | static void __init do_ctors(void) | |
1081 | { | |
55b6f763 JB |
1082 | /* |
1083 | * For UML, the constructors have already been called by the | |
1084 | * normal setup code as it's just a normal ELF binary, so we | |
1085 | * cannot do it again - but we do need CONFIG_CONSTRUCTORS | |
1086 | * even on UML for modules. | |
1087 | */ | |
1088 | #if defined(CONFIG_CONSTRUCTORS) && !defined(CONFIG_UML) | |
196a15b4 | 1089 | ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; |
b99b87f7 | 1090 | |
196a15b4 HS |
1091 | for (; fn < (ctor_fn_t *) __ctors_end; fn++) |
1092 | (*fn)(); | |
b99b87f7 PO |
1093 | #endif |
1094 | } | |
1095 | ||
7b0b73d7 PB |
1096 | #ifdef CONFIG_KALLSYMS |
1097 | struct blacklist_entry { | |
1098 | struct list_head next; | |
1099 | char *buf; | |
1100 | }; | |
1101 | ||
1102 | static __initdata_or_module LIST_HEAD(blacklisted_initcalls); | |
1103 | ||
1104 | static int __init initcall_blacklist(char *str) | |
1105 | { | |
1106 | char *str_entry; | |
1107 | struct blacklist_entry *entry; | |
1108 | ||
1109 | /* str argument is a comma-separated list of functions */ | |
1110 | do { | |
1111 | str_entry = strsep(&str, ","); | |
1112 | if (str_entry) { | |
1113 | pr_debug("blacklisting initcall %s\n", str_entry); | |
7e1c4e27 MR |
1114 | entry = memblock_alloc(sizeof(*entry), |
1115 | SMP_CACHE_BYTES); | |
f5c7310a MR |
1116 | if (!entry) |
1117 | panic("%s: Failed to allocate %zu bytes\n", | |
1118 | __func__, sizeof(*entry)); | |
7e1c4e27 MR |
1119 | entry->buf = memblock_alloc(strlen(str_entry) + 1, |
1120 | SMP_CACHE_BYTES); | |
f5c7310a MR |
1121 | if (!entry->buf) |
1122 | panic("%s: Failed to allocate %zu bytes\n", | |
1123 | __func__, strlen(str_entry) + 1); | |
7b0b73d7 PB |
1124 | strcpy(entry->buf, str_entry); |
1125 | list_add(&entry->next, &blacklisted_initcalls); | |
1126 | } | |
1127 | } while (str_entry); | |
1128 | ||
f9a40b08 | 1129 | return 1; |
7b0b73d7 PB |
1130 | } |
1131 | ||
1132 | static bool __init_or_module initcall_blacklisted(initcall_t fn) | |
1133 | { | |
7b0b73d7 | 1134 | struct blacklist_entry *entry; |
c8cdd2be | 1135 | char fn_name[KSYM_SYMBOL_LEN]; |
0fd5ed8d | 1136 | unsigned long addr; |
7b0b73d7 | 1137 | |
c8cdd2be | 1138 | if (list_empty(&blacklisted_initcalls)) |
7b0b73d7 PB |
1139 | return false; |
1140 | ||
0fd5ed8d RV |
1141 | addr = (unsigned long) dereference_function_descriptor(fn); |
1142 | sprint_symbol_no_offset(fn_name, addr); | |
c8cdd2be | 1143 | |
841c06d7 PB |
1144 | /* |
1145 | * fn will be "function_name [module_name]" where [module_name] is not | |
1146 | * displayed for built-in init functions. Strip off the [module_name]. | |
1147 | */ | |
1148 | strreplace(fn_name, ' ', '\0'); | |
1149 | ||
e6fd1fb3 | 1150 | list_for_each_entry(entry, &blacklisted_initcalls, next) { |
7b0b73d7 PB |
1151 | if (!strcmp(fn_name, entry->buf)) { |
1152 | pr_debug("initcall %s blacklisted\n", fn_name); | |
7b0b73d7 PB |
1153 | return true; |
1154 | } | |
1155 | } | |
1156 | ||
7b0b73d7 PB |
1157 | return false; |
1158 | } | |
1159 | #else | |
1160 | static int __init initcall_blacklist(char *str) | |
1161 | { | |
1162 | pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n"); | |
1163 | return 0; | |
1164 | } | |
1165 | ||
1166 | static bool __init_or_module initcall_blacklisted(initcall_t fn) | |
1167 | { | |
1168 | return false; | |
1169 | } | |
1170 | #endif | |
1171 | __setup("initcall_blacklist=", initcall_blacklist); | |
1172 | ||
4e37958d SRV |
1173 | static __init_or_module void |
1174 | trace_initcall_start_cb(void *data, initcall_t fn) | |
1da177e4 | 1175 | { |
374d6cda | 1176 | ktime_t *calltime = data; |
1da177e4 | 1177 | |
58e2cf5d | 1178 | printk(KERN_DEBUG "calling %pS @ %i\n", fn, task_pid_nr(current)); |
4e37958d SRV |
1179 | *calltime = ktime_get(); |
1180 | } | |
1181 | ||
1182 | static __init_or_module void | |
1183 | trace_initcall_finish_cb(void *data, initcall_t fn, int ret) | |
1184 | { | |
374d6cda | 1185 | ktime_t rettime, *calltime = data; |
4e37958d | 1186 | |
22c5c03b | 1187 | rettime = ktime_get(); |
58e2cf5d | 1188 | printk(KERN_DEBUG "initcall %pS returned %d after %lld usecs\n", |
105e8c2e | 1189 | fn, ret, (unsigned long long)ktime_us_delta(rettime, *calltime)); |
4e37958d | 1190 | } |
1da177e4 | 1191 | |
4e37958d SRV |
1192 | static ktime_t initcall_calltime; |
1193 | ||
b0dc52f1 | 1194 | #ifdef TRACEPOINTS_ENABLED |
4e37958d SRV |
1195 | static void __init initcall_debug_enable(void) |
1196 | { | |
1197 | int ret; | |
1198 | ||
1199 | ret = register_trace_initcall_start(trace_initcall_start_cb, | |
1200 | &initcall_calltime); | |
1201 | ret |= register_trace_initcall_finish(trace_initcall_finish_cb, | |
1202 | &initcall_calltime); | |
1203 | WARN(ret, "Failed to register initcall tracepoints\n"); | |
22c5c03b | 1204 | } |
b0dc52f1 SRV |
1205 | # define do_trace_initcall_start trace_initcall_start |
1206 | # define do_trace_initcall_finish trace_initcall_finish | |
1207 | #else | |
1208 | static inline void do_trace_initcall_start(initcall_t fn) | |
1209 | { | |
1210 | if (!initcall_debug) | |
1211 | return; | |
1212 | trace_initcall_start_cb(&initcall_calltime, fn); | |
1213 | } | |
1214 | static inline void do_trace_initcall_finish(initcall_t fn, int ret) | |
1215 | { | |
1216 | if (!initcall_debug) | |
1217 | return; | |
1218 | trace_initcall_finish_cb(&initcall_calltime, fn, ret); | |
1219 | } | |
1220 | #endif /* !TRACEPOINTS_ENABLED */ | |
22c5c03b | 1221 | |
e4461271 | 1222 | int __init_or_module do_one_initcall(initcall_t fn) |
22c5c03b KW |
1223 | { |
1224 | int count = preempt_count(); | |
ff1c8fac | 1225 | char msgbuf[64]; |
4e37958d | 1226 | int ret; |
22c5c03b | 1227 | |
7b0b73d7 PB |
1228 | if (initcall_blacklisted(fn)) |
1229 | return -EPERM; | |
1230 | ||
b0dc52f1 | 1231 | do_trace_initcall_start(fn); |
4e37958d | 1232 | ret = fn(); |
b0dc52f1 | 1233 | do_trace_initcall_finish(fn, ret); |
8f0c45cd | 1234 | |
e0df154f | 1235 | msgbuf[0] = 0; |
e662e1cf | 1236 | |
e0df154f | 1237 | if (preempt_count() != count) { |
bf5d770b | 1238 | sprintf(msgbuf, "preemption imbalance "); |
4a2b4b22 | 1239 | preempt_count_set(count); |
1da177e4 | 1240 | } |
e0df154f | 1241 | if (irqs_disabled()) { |
a76bfd0d | 1242 | strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); |
e0df154f LT |
1243 | local_irq_enable(); |
1244 | } | |
d75f773c | 1245 | WARN(msgbuf[0], "initcall %pS returned with %s\n", fn, msgbuf); |
59f9415f | 1246 | |
38addce8 | 1247 | add_latent_entropy(); |
30dbb20e | 1248 | return ret; |
e0df154f LT |
1249 | } |
1250 | ||
1251 | ||
1b1eeca7 | 1252 | static initcall_entry_t *initcall_levels[] __initdata = { |
026cee00 PM |
1253 | __initcall0_start, |
1254 | __initcall1_start, | |
1255 | __initcall2_start, | |
1256 | __initcall3_start, | |
1257 | __initcall4_start, | |
1258 | __initcall5_start, | |
1259 | __initcall6_start, | |
1260 | __initcall7_start, | |
1261 | __initcall_end, | |
1262 | }; | |
1263 | ||
96263d28 | 1264 | /* Keep these in sync with initcalls in include/linux/init.h */ |
7c8f7193 | 1265 | static const char *initcall_level_names[] __initdata = { |
a6fb6012 | 1266 | "pure", |
9fb48c74 JC |
1267 | "core", |
1268 | "postcore", | |
1269 | "arch", | |
1270 | "subsys", | |
1271 | "fs", | |
1272 | "device", | |
1273 | "late", | |
026cee00 PM |
1274 | }; |
1275 | ||
7e2762e1 AS |
1276 | static int __init ignore_unknown_bootoption(char *param, char *val, |
1277 | const char *unused, void *arg) | |
1278 | { | |
1279 | return 0; | |
1280 | } | |
1281 | ||
0068c92a | 1282 | static void __init do_initcall_level(int level, char *command_line) |
e0df154f | 1283 | { |
1b1eeca7 | 1284 | initcall_entry_t *fn; |
e0df154f | 1285 | |
026cee00 | 1286 | parse_args(initcall_level_names[level], |
0068c92a | 1287 | command_line, __start___param, |
026cee00 PM |
1288 | __stop___param - __start___param, |
1289 | level, level, | |
7e2762e1 | 1290 | NULL, ignore_unknown_bootoption); |
026cee00 | 1291 | |
4ee7c60d | 1292 | trace_initcall_level(initcall_level_names[level]); |
026cee00 | 1293 | for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++) |
1b1eeca7 | 1294 | do_one_initcall(initcall_from_entry(fn)); |
1da177e4 LT |
1295 | } |
1296 | ||
026cee00 PM |
1297 | static void __init do_initcalls(void) |
1298 | { | |
1299 | int level; | |
941baf6f | 1300 | size_t len = saved_command_line_len + 1; |
0068c92a MH |
1301 | char *command_line; |
1302 | ||
1303 | command_line = kzalloc(len, GFP_KERNEL); | |
1304 | if (!command_line) | |
1305 | panic("%s: Failed to allocate %zu bytes\n", __func__, len); | |
1306 | ||
1307 | for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) { | |
1308 | /* Parser modifies command_line, restore it each time */ | |
1309 | strcpy(command_line, saved_command_line); | |
1310 | do_initcall_level(level, command_line); | |
1311 | } | |
026cee00 | 1312 | |
0068c92a | 1313 | kfree(command_line); |
026cee00 PM |
1314 | } |
1315 | ||
1da177e4 LT |
1316 | /* |
1317 | * Ok, the machine is now initialized. None of the devices | |
1318 | * have been touched yet, but the CPU subsystem is up and | |
1319 | * running, and memory and process management works. | |
1320 | * | |
1321 | * Now we can finally start doing some real work.. | |
1322 | */ | |
1323 | static void __init do_basic_setup(void) | |
1324 | { | |
759ee091 | 1325 | cpuset_init_smp(); |
1da177e4 | 1326 | driver_init(); |
b04c3afb | 1327 | init_irq_proc(); |
b99b87f7 | 1328 | do_ctors(); |
b0f84374 | 1329 | do_initcalls(); |
1da177e4 LT |
1330 | } |
1331 | ||
7babe8db | 1332 | static void __init do_pre_smp_initcalls(void) |
c2147a50 | 1333 | { |
1b1eeca7 | 1334 | initcall_entry_t *fn; |
c2147a50 | 1335 | |
4ee7c60d | 1336 | trace_initcall_level("early"); |
026cee00 | 1337 | for (fn = __initcall_start; fn < __initcall0_start; fn++) |
1b1eeca7 | 1338 | do_one_initcall(initcall_from_entry(fn)); |
c2147a50 EGM |
1339 | } |
1340 | ||
a74fb73c | 1341 | static int run_init_process(const char *init_filename) |
1da177e4 | 1342 | { |
b88c50ac AS |
1343 | const char *const *p; |
1344 | ||
1da177e4 | 1345 | argv_init[0] = init_filename; |
3f5c15d8 | 1346 | pr_info("Run %s as init process\n", init_filename); |
b88c50ac AS |
1347 | pr_debug(" with arguments:\n"); |
1348 | for (p = argv_init; *p; p++) | |
1349 | pr_debug(" %s\n", *p); | |
1350 | pr_debug(" with environment:\n"); | |
1351 | for (p = envp_init; *p; p++) | |
1352 | pr_debug(" %s\n", *p); | |
be619f7f | 1353 | return kernel_execve(init_filename, argv_init, envp_init); |
1da177e4 LT |
1354 | } |
1355 | ||
ba24762b MO |
1356 | static int try_to_run_init_process(const char *init_filename) |
1357 | { | |
1358 | int ret; | |
1359 | ||
1360 | ret = run_init_process(init_filename); | |
1361 | ||
1362 | if (ret && ret != -ENOENT) { | |
1363 | pr_err("Starting init: %s exists but couldn't execute it (error %d)\n", | |
1364 | init_filename, ret); | |
1365 | } | |
1366 | ||
1367 | return ret; | |
1368 | } | |
1369 | ||
f80b0c90 | 1370 | static noinline void __init kernel_init_freeable(void); |
d6b21238 | 1371 | |
0f5bf6d0 | 1372 | #if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX) |
39290b38 | 1373 | bool rodata_enabled __ro_after_init = true; |
2e8cff0a MR |
1374 | |
1375 | #ifndef arch_parse_debug_rodata | |
1376 | static inline bool arch_parse_debug_rodata(char *str) { return false; } | |
1377 | #endif | |
1378 | ||
d2aa1aca KC |
1379 | static int __init set_debug_rodata(char *str) |
1380 | { | |
2e8cff0a MR |
1381 | if (arch_parse_debug_rodata(str)) |
1382 | return 0; | |
1383 | ||
1384 | if (str && !strcmp(str, "on")) | |
1385 | rodata_enabled = true; | |
1386 | else if (str && !strcmp(str, "off")) | |
1387 | rodata_enabled = false; | |
1388 | else | |
f9a40b08 | 1389 | pr_warn("Invalid option string for rodata: '%s'\n", str); |
2e8cff0a | 1390 | return 0; |
d2aa1aca | 1391 | } |
2e8cff0a | 1392 | early_param("rodata", set_debug_rodata); |
39290b38 | 1393 | #endif |
d2aa1aca | 1394 | |
0f5bf6d0 | 1395 | #ifdef CONFIG_STRICT_KERNEL_RWX |
d2aa1aca KC |
1396 | static void mark_readonly(void) |
1397 | { | |
2959a5f7 | 1398 | if (rodata_enabled) { |
ae646f0b | 1399 | /* |
ba180314 PM |
1400 | * load_module() results in W+X mappings, which are cleaned |
1401 | * up with call_rcu(). Let's make sure that queued work is | |
ae646f0b JH |
1402 | * flushed so that we don't hit false positives looking for |
1403 | * insecure pages which are W+X. | |
1404 | */ | |
ba180314 | 1405 | rcu_barrier(); |
d2aa1aca | 1406 | mark_rodata_ro(); |
2959a5f7 JP |
1407 | rodata_test(); |
1408 | } else | |
d2aa1aca KC |
1409 | pr_info("Kernel memory protection disabled.\n"); |
1410 | } | |
f596ded1 CL |
1411 | #elif defined(CONFIG_ARCH_HAS_STRICT_KERNEL_RWX) |
1412 | static inline void mark_readonly(void) | |
1413 | { | |
1414 | pr_warn("Kernel memory protection not selected by kernel config.\n"); | |
1415 | } | |
d2aa1aca KC |
1416 | #else |
1417 | static inline void mark_readonly(void) | |
1418 | { | |
1419 | pr_warn("This architecture does not have kernel memory protection.\n"); | |
1420 | } | |
1421 | #endif | |
1422 | ||
997aef68 MR |
1423 | void __weak free_initmem(void) |
1424 | { | |
f4039999 | 1425 | free_initmem_default(POISON_FREE_INITMEM); |
997aef68 MR |
1426 | } |
1427 | ||
d6b21238 | 1428 | static int __ref kernel_init(void *unused) |
ee5bfa64 | 1429 | { |
ba24762b MO |
1430 | int ret; |
1431 | ||
15faafc6 PZ |
1432 | /* |
1433 | * Wait until kthreadd is all set-up. | |
1434 | */ | |
1435 | wait_for_completion(&kthreadd_done); | |
1436 | ||
d6b21238 | 1437 | kernel_init_freeable(); |
22a9d645 AV |
1438 | /* need to finish all async __init code before freeing the memory */ |
1439 | async_synchronize_full(); | |
d2635f20 CL |
1440 | |
1441 | system_state = SYSTEM_FREEING_INITMEM; | |
82d083ab | 1442 | kprobe_free_init_mem(); |
b80f0f6c | 1443 | ftrace_free_init_mem(); |
d54ce615 | 1444 | kgdb_free_init_mem(); |
40caa127 | 1445 | exit_boot_config(); |
ee5bfa64 | 1446 | free_initmem(); |
d2aa1aca | 1447 | mark_readonly(); |
b976690f JR |
1448 | |
1449 | /* | |
1450 | * Kernel mappings are now finalized - update the userspace page-table | |
1451 | * to finalize PTI. | |
1452 | */ | |
1453 | pti_finalize(); | |
1454 | ||
ee5bfa64 VG |
1455 | system_state = SYSTEM_RUNNING; |
1456 | numa_default_policy(); | |
1457 | ||
967dcb8f PM |
1458 | rcu_end_inkernel_boot(); |
1459 | ||
3db978d4 VB |
1460 | do_sysctl_args(); |
1461 | ||
ee5bfa64 | 1462 | if (ramdisk_execute_command) { |
ba24762b MO |
1463 | ret = run_init_process(ramdisk_execute_command); |
1464 | if (!ret) | |
a74fb73c | 1465 | return 0; |
ba24762b MO |
1466 | pr_err("Failed to execute %s (error %d)\n", |
1467 | ramdisk_execute_command, ret); | |
ee5bfa64 VG |
1468 | } |
1469 | ||
1470 | /* | |
1471 | * We try each of these until one succeeds. | |
1472 | * | |
1473 | * The Bourne shell can be used instead of init if we are | |
1474 | * trying to recover a really broken machine. | |
1475 | */ | |
1476 | if (execute_command) { | |
ba24762b MO |
1477 | ret = run_init_process(execute_command); |
1478 | if (!ret) | |
a74fb73c | 1479 | return 0; |
6ef4536e AL |
1480 | panic("Requested init %s failed (error %d).", |
1481 | execute_command, ret); | |
ee5bfa64 | 1482 | } |
ada4ab7a CD |
1483 | |
1484 | if (CONFIG_DEFAULT_INIT[0] != '\0') { | |
1485 | ret = run_init_process(CONFIG_DEFAULT_INIT); | |
1486 | if (ret) | |
1487 | pr_err("Default init %s failed (error %d)\n", | |
1488 | CONFIG_DEFAULT_INIT, ret); | |
1489 | else | |
1490 | return 0; | |
1491 | } | |
1492 | ||
ba24762b MO |
1493 | if (!try_to_run_init_process("/sbin/init") || |
1494 | !try_to_run_init_process("/etc/init") || | |
1495 | !try_to_run_init_process("/bin/init") || | |
1496 | !try_to_run_init_process("/bin/sh")) | |
a74fb73c | 1497 | return 0; |
ee5bfa64 | 1498 | |
ba24762b | 1499 | panic("No working init found. Try passing init= option to kernel. " |
8c27ceff | 1500 | "See Linux Documentation/admin-guide/init.rst for guidance."); |
ee5bfa64 VG |
1501 | } |
1502 | ||
8f740636 | 1503 | /* Open /dev/console, for stdin/stdout/stderr, this should never fail */ |
a94b5214 | 1504 | void __init console_on_rootfs(void) |
b49a733d | 1505 | { |
8f740636 | 1506 | struct file *file = filp_open("/dev/console", O_RDWR, 0); |
b49a733d | 1507 | |
8f740636 | 1508 | if (IS_ERR(file)) { |
a91bd622 PM |
1509 | pr_err("Warning: unable to open an initial console.\n"); |
1510 | return; | |
8f740636 | 1511 | } |
f0735310 CH |
1512 | init_dup(file); |
1513 | init_dup(file); | |
1514 | init_dup(file); | |
1515 | fput(file); | |
b49a733d DB |
1516 | } |
1517 | ||
f80b0c90 | 1518 | static noinline void __init kernel_init_freeable(void) |
1da177e4 | 1519 | { |
31a67102 LT |
1520 | /* Now the scheduler is fully set up and can do blocking allocations */ |
1521 | gfp_allowed_mask = __GFP_BITS_MASK; | |
1522 | ||
58568d2a MX |
1523 | /* |
1524 | * init can allocate pages on any node | |
1525 | */ | |
3c466d46 | 1526 | set_mems_allowed(node_states[N_MEMORY]); |
1da177e4 | 1527 | |
0711f0d7 | 1528 | cad_pid = get_pid(task_pid(current)); |
9ec52099 | 1529 | |
ca74a6f8 | 1530 | smp_prepare_cpus(setup_max_cpus); |
1da177e4 | 1531 | |
3347fa09 TH |
1532 | workqueue_init(); |
1533 | ||
597b7305 MH |
1534 | init_mm_internals(); |
1535 | ||
1b04fa99 | 1536 | rcu_init_tasks_generic(); |
1da177e4 | 1537 | do_pre_smp_initcalls(); |
004417a6 | 1538 | lockup_detector_init(); |
1da177e4 | 1539 | |
1da177e4 LT |
1540 | smp_init(); |
1541 | sched_init_smp(); | |
1542 | ||
f1b192b1 | 1543 | padata_init(); |
0e1cc95b MG |
1544 | page_alloc_init_late(); |
1545 | ||
1da177e4 LT |
1546 | do_basic_setup(); |
1547 | ||
8c0d8849 BH |
1548 | kunit_run_all_tests(); |
1549 | ||
e7cb072e | 1550 | wait_for_initramfs(); |
b49a733d | 1551 | console_on_rootfs(); |
2bd3a997 | 1552 | |
1da177e4 LT |
1553 | /* |
1554 | * check if there is an early userspace init. If yes, let it do all | |
1555 | * the work | |
1556 | */ | |
eb9d7d39 | 1557 | if (init_eaccess(ramdisk_execute_command) != 0) { |
ffdfc409 | 1558 | ramdisk_execute_command = NULL; |
1da177e4 | 1559 | prepare_namespace(); |
ffdfc409 | 1560 | } |
1da177e4 LT |
1561 | |
1562 | /* | |
1563 | * Ok, we have completed the initial bootup, and | |
1564 | * we're essentially up and running. Get rid of the | |
1565 | * initmem segments and start the user-mode stuff.. | |
c9cd2ce2 DK |
1566 | * |
1567 | * rootfs is available now, try loading the public keys | |
1568 | * and default modules | |
1da177e4 | 1569 | */ |
bb813f4c | 1570 | |
c9cd2ce2 | 1571 | integrity_load_keys(); |
1da177e4 | 1572 | } |