1// SPDX-License-Identifier: GPL-2.0-only 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 10 * Simplified starting of init: Michael A. Griffith <grif@acm.org> 11 */ 12 13#define DEBUG /* Enable initcall_debug */ 14 15#include <linux/types.h> 16#include <linux/extable.h> 17#include <linux/module.h> 18#include <linux/proc_fs.h> 19#include <linux/binfmts.h> 20#include <linux/kernel.h> 21#include <linux/syscalls.h> 22#include <linux/stackprotector.h> 23#include <linux/string.h> 24#include <linux/ctype.h> 25#include <linux/delay.h> 26#include <linux/ioport.h> 27#include <linux/init.h> 28#include <linux/initrd.h> 29#include <linux/memblock.h> 30#include <linux/acpi.h> 31#include <linux/bootconfig.h> 32#include <linux/console.h> 33#include <linux/nmi.h> 34#include <linux/percpu.h> 35#include <linux/kmod.h> 36#include <linux/kprobes.h> 37#include <linux/kmsan.h> 38#include <linux/vmalloc.h> 39#include <linux/kernel_stat.h> 40#include <linux/start_kernel.h> 41#include <linux/security.h> 42#include <linux/smp.h> 43#include <linux/profile.h> 44#include <linux/kfence.h> 45#include <linux/rcupdate.h> 46#include <linux/srcu.h> 47#include <linux/moduleparam.h> 48#include <linux/kallsyms.h> 49#include <linux/buildid.h> 50#include <linux/writeback.h> 51#include <linux/cpu.h> 52#include <linux/cpuset.h> 53#include <linux/cgroup.h> 54#include <linux/efi.h> 55#include <linux/tick.h> 56#include <linux/sched/isolation.h> 57#include <linux/interrupt.h> 58#include <linux/taskstats_kern.h> 59#include <linux/delayacct.h> 60#include <linux/unistd.h> 61#include <linux/utsname.h> 62#include <linux/rmap.h> 63#include <linux/mempolicy.h> 64#include <linux/key.h> 65#include <linux/debug_locks.h> 66#include <linux/debugobjects.h> 67#include <linux/lockdep.h> 68#include <linux/kmemleak.h> 69#include <linux/padata.h> 70#include <linux/pid_namespace.h> 71#include <linux/device/driver.h> 72#include <linux/kthread.h> 73#include <linux/sched.h> 74#include <linux/sched/init.h> 75#include <linux/signal.h> 76#include <linux/idr.h> 77#include <linux/kgdb.h> 78#include <linux/ftrace.h> 79#include <linux/async.h> 80#include <linux/shmem_fs.h> 81#include <linux/slab.h> 82#include <linux/perf_event.h> 83#include <linux/ptrace.h> 84#include <linux/pti.h> 85#include <linux/blkdev.h> 86#include <linux/sched/clock.h> 87#include <linux/sched/task.h> 88#include <linux/sched/task_stack.h> 89#include <linux/context_tracking.h> 90#include <linux/random.h> 91#include <linux/moduleloader.h> 92#include <linux/list.h> 93#include <linux/integrity.h> 94#include <linux/proc_ns.h> 95#include <linux/io.h> 96#include <linux/cache.h> 97#include <linux/rodata_test.h> 98#include <linux/jump_label.h> 99#include <linux/kcsan.h> 100#include <linux/init_syscalls.h> 101#include <linux/stackdepot.h> 102#include <linux/randomize_kstack.h> 103#include <linux/pidfs.h> 104#include <linux/ptdump.h> 105#include <net/net_namespace.h> 106 107#include <asm/io.h> 108#include <asm/setup.h> 109#include <asm/sections.h> 110#include <asm/cacheflush.h> 111 112#define CREATE_TRACE_POINTS 113#include <trace/events/initcall.h> 114 115#include <kunit/test.h> 116 117static int kernel_init(void *); 118 119/* 120 * Debug helper: via this flag we know that we are in 'early bootup code' 121 * where only the boot processor is running with IRQ disabled. This means 122 * two things - IRQ must not be enabled before the flag is cleared and some 123 * operations which are not allowed with IRQ disabled are allowed while the 124 * flag is set. 125 */ 126bool early_boot_irqs_disabled __read_mostly; 127 128enum system_states system_state __read_mostly; 129EXPORT_SYMBOL(system_state); 130 131/* 132 * Boot command-line arguments 133 */ 134#define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT 135#define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT 136 137/* Default late time init is NULL. archs can override this later. */ 138void (*__initdata late_time_init)(void); 139 140/* Untouched command line saved by arch-specific code. */ 141char __initdata boot_command_line[COMMAND_LINE_SIZE]; 142/* Untouched saved command line (eg. for /proc) */ 143char *saved_command_line __ro_after_init; 144unsigned int saved_command_line_len __ro_after_init; 145/* Command line for parameter parsing */ 146static char *static_command_line; 147/* Untouched extra command line */ 148static char *extra_command_line; 149/* Extra init arguments */ 150static char *extra_init_args; 151 152#ifdef CONFIG_BOOT_CONFIG 153/* Is bootconfig on command line? */ 154static bool bootconfig_found; 155static size_t initargs_offs; 156#else 157# define bootconfig_found false 158# define initargs_offs 0 159#endif 160 161static char *execute_command; 162static char *ramdisk_execute_command = "/init"; 163 164/* 165 * Used to generate warnings if static_key manipulation functions are used 166 * before jump_label_init is called. 167 */ 168bool static_key_initialized __read_mostly; 169EXPORT_SYMBOL_GPL(static_key_initialized); 170 171/* 172 * If set, this is an indication to the drivers that reset the underlying 173 * device before going ahead with the initialization otherwise driver might 174 * rely on the BIOS and skip the reset operation. 175 * 176 * This is useful if kernel is booting in an unreliable environment. 177 * For ex. kdump situation where previous kernel has crashed, BIOS has been 178 * skipped and devices will be in unknown state. 179 */ 180unsigned int reset_devices; 181EXPORT_SYMBOL(reset_devices); 182 183static int __init set_reset_devices(char *str) 184{ 185 reset_devices = 1; 186 return 1; 187} 188 189__setup("reset_devices", set_reset_devices); 190 191static const char *argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; 192const char *envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; 193static const char *panic_later, *panic_param; 194 195static bool __init obsolete_checksetup(char *line) 196{ 197 const struct obs_kernel_param *p; 198 bool had_early_param = false; 199 200 p = __setup_start; 201 do { 202 int n = strlen(p->str); 203 if (parameqn(line, p->str, n)) { 204 if (p->early) { 205 /* Already done in parse_early_param? 206 * (Needs exact match on param part). 207 * Keep iterating, as we can have early 208 * params and __setups of same names 8( */ 209 if (line[n] == '\0' || line[n] == '=') 210 had_early_param = true; 211 } else if (!p->setup_func) { 212 pr_warn("Parameter %s is obsolete, ignored\n", 213 p->str); 214 return true; 215 } else if (p->setup_func(line + n)) 216 return true; 217 } 218 p++; 219 } while (p < __setup_end); 220 221 return had_early_param; 222} 223 224/* 225 * This should be approx 2 Bo*oMips to start (note initial shift), and will 226 * still work even if initially too large, it will just take slightly longer 227 */ 228unsigned long loops_per_jiffy = (1<<12); 229EXPORT_SYMBOL(loops_per_jiffy); 230 231static int __init debug_kernel(char *str) 232{ 233 console_loglevel = CONSOLE_LOGLEVEL_DEBUG; 234 return 0; 235} 236 237static int __init quiet_kernel(char *str) 238{ 239 console_loglevel = CONSOLE_LOGLEVEL_QUIET; 240 return 0; 241} 242 243early_param("debug", debug_kernel); 244early_param("quiet", quiet_kernel); 245 246static int __init loglevel(char *str) 247{ 248 int newlevel; 249 250 /* 251 * Only update loglevel value when a correct setting was passed, 252 * to prevent blind crashes (when loglevel being set to 0) that 253 * are quite hard to debug 254 */ 255 if (get_option(&str, &newlevel)) { 256 console_loglevel = newlevel; 257 return 0; 258 } 259 260 return -EINVAL; 261} 262 263early_param("loglevel", loglevel); 264 265#ifdef CONFIG_BLK_DEV_INITRD 266static void * __init get_boot_config_from_initrd(size_t *_size) 267{ 268 u32 size, csum; 269 char *data; 270 u32 *hdr; 271 int i; 272 273 if (!initrd_end) 274 return NULL; 275 276 data = (char *)initrd_end - BOOTCONFIG_MAGIC_LEN; 277 /* 278 * Since Grub may align the size of initrd to 4, we must 279 * check the preceding 3 bytes as well. 280 */ 281 for (i = 0; i < 4; i++) { 282 if (!memcmp(data, BOOTCONFIG_MAGIC, BOOTCONFIG_MAGIC_LEN)) 283 goto found; 284 data--; 285 } 286 return NULL; 287 288found: 289 hdr = (u32 *)(data - 8); 290 size = le32_to_cpu(hdr[0]); 291 csum = le32_to_cpu(hdr[1]); 292 293 data = ((void *)hdr) - size; 294 if ((unsigned long)data < initrd_start) { 295 pr_err("bootconfig size %d is greater than initrd size %ld\n", 296 size, initrd_end - initrd_start); 297 return NULL; 298 } 299 300 if (xbc_calc_checksum(data, size) != csum) { 301 pr_err("bootconfig checksum failed\n"); 302 return NULL; 303 } 304 305 /* Remove bootconfig from initramfs/initrd */ 306 initrd_end = (unsigned long)data; 307 if (_size) 308 *_size = size; 309 310 return data; 311} 312#else 313static void * __init get_boot_config_from_initrd(size_t *_size) 314{ 315 return NULL; 316} 317#endif 318 319#ifdef CONFIG_BOOT_CONFIG 320 321static char xbc_namebuf[XBC_KEYLEN_MAX] __initdata; 322 323#define rest(dst, end) ((end) > (dst) ? (end) - (dst) : 0) 324 325static int __init xbc_snprint_cmdline(char *buf, size_t size, 326 struct xbc_node *root) 327{ 328 struct xbc_node *knode, *vnode; 329 char *end = buf + size; 330 const char *val; 331 int ret; 332 333 xbc_node_for_each_key_value(root, knode, val) { 334 ret = xbc_node_compose_key_after(root, knode, 335 xbc_namebuf, XBC_KEYLEN_MAX); 336 if (ret < 0) 337 return ret; 338 339 vnode = xbc_node_get_child(knode); 340 if (!vnode) { 341 ret = snprintf(buf, rest(buf, end), "%s ", xbc_namebuf); 342 if (ret < 0) 343 return ret; 344 buf += ret; 345 continue; 346 } 347 xbc_array_for_each_value(vnode, val) { 348 ret = snprintf(buf, rest(buf, end), "%s=\"%s\" ", 349 xbc_namebuf, val); 350 if (ret < 0) 351 return ret; 352 buf += ret; 353 } 354 } 355 356 return buf - (end - size); 357} 358#undef rest 359 360/* Make an extra command line under given key word */ 361static char * __init xbc_make_cmdline(const char *key) 362{ 363 struct xbc_node *root; 364 char *new_cmdline; 365 int ret, len = 0; 366 367 root = xbc_find_node(key); 368 if (!root) 369 return NULL; 370 371 /* Count required buffer size */ 372 len = xbc_snprint_cmdline(NULL, 0, root); 373 if (len <= 0) 374 return NULL; 375 376 new_cmdline = memblock_alloc(len + 1, SMP_CACHE_BYTES); 377 if (!new_cmdline) { 378 pr_err("Failed to allocate memory for extra kernel cmdline.\n"); 379 return NULL; 380 } 381 382 ret = xbc_snprint_cmdline(new_cmdline, len + 1, root); 383 if (ret < 0 || ret > len) { 384 pr_err("Failed to print extra kernel cmdline.\n"); 385 memblock_free(new_cmdline, len + 1); 386 return NULL; 387 } 388 389 return new_cmdline; 390} 391 392static int __init bootconfig_params(char *param, char *val, 393 const char *unused, void *arg) 394{ 395 if (strcmp(param, "bootconfig") == 0) { 396 bootconfig_found = true; 397 } 398 return 0; 399} 400 401static int __init warn_bootconfig(char *str) 402{ 403 /* The 'bootconfig' has been handled by bootconfig_params(). */ 404 return 0; 405} 406 407static void __init setup_boot_config(void) 408{ 409 static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata; 410 const char *msg, *data; 411 int pos, ret; 412 size_t size; 413 char *err; 414 415 /* Cut out the bootconfig data even if we have no bootconfig option */ 416 data = get_boot_config_from_initrd(&size); 417 /* If there is no bootconfig in initrd, try embedded one. */ 418 if (!data) 419 data = xbc_get_embedded_bootconfig(&size); 420 421 strscpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); 422 err = parse_args("bootconfig", tmp_cmdline, NULL, 0, 0, 0, NULL, 423 bootconfig_params); 424 425 if (IS_ERR(err) || !(bootconfig_found || IS_ENABLED(CONFIG_BOOT_CONFIG_FORCE))) 426 return; 427 428 /* parse_args() stops at the next param of '--' and returns an address */ 429 if (err) 430 initargs_offs = err - tmp_cmdline; 431 432 if (!data) { 433 /* If user intended to use bootconfig, show an error level message */ 434 if (bootconfig_found) 435 pr_err("'bootconfig' found on command line, but no bootconfig found\n"); 436 else 437 pr_info("No bootconfig data provided, so skipping bootconfig"); 438 return; 439 } 440 441 if (size >= XBC_DATA_MAX) { 442 pr_err("bootconfig size %ld greater than max size %d\n", 443 (long)size, XBC_DATA_MAX); 444 return; 445 } 446 447 ret = xbc_init(data, size, &msg, &pos); 448 if (ret < 0) { 449 if (pos < 0) 450 pr_err("Failed to init bootconfig: %s.\n", msg); 451 else 452 pr_err("Failed to parse bootconfig: %s at %d.\n", 453 msg, pos); 454 } else { 455 xbc_get_info(&ret, NULL); 456 pr_info("Load bootconfig: %ld bytes %d nodes\n", (long)size, ret); 457 /* keys starting with "kernel." are passed via cmdline */ 458 extra_command_line = xbc_make_cmdline("kernel"); 459 /* Also, "init." keys are init arguments */ 460 extra_init_args = xbc_make_cmdline("init"); 461 } 462 return; 463} 464 465static void __init exit_boot_config(void) 466{ 467 xbc_exit(); 468} 469 470#else /* !CONFIG_BOOT_CONFIG */ 471 472static void __init setup_boot_config(void) 473{ 474 /* Remove bootconfig data from initrd */ 475 get_boot_config_from_initrd(NULL); 476} 477 478static int __init warn_bootconfig(char *str) 479{ 480 pr_warn("WARNING: 'bootconfig' found on the kernel command line but CONFIG_BOOT_CONFIG is not set.\n"); 481 return 0; 482} 483 484#define exit_boot_config() do {} while (0) 485 486#endif /* CONFIG_BOOT_CONFIG */ 487 488early_param("bootconfig", warn_bootconfig); 489 490bool __init cmdline_has_extra_options(void) 491{ 492 return extra_command_line || extra_init_args; 493} 494 495/* Change NUL term back to "=", to make "param" the whole string. */ 496static void __init repair_env_string(char *param, char *val) 497{ 498 if (val) { 499 /* param=val or param="val"? */ 500 if (val == param+strlen(param)+1) 501 val[-1] = '='; 502 else if (val == param+strlen(param)+2) { 503 val[-2] = '='; 504 memmove(val-1, val, strlen(val)+1); 505 } else 506 BUG(); 507 } 508} 509 510/* Anything after -- gets handed straight to init. */ 511static int __init set_init_arg(char *param, char *val, 512 const char *unused, void *arg) 513{ 514 unsigned int i; 515 516 if (panic_later) 517 return 0; 518 519 repair_env_string(param, val); 520 521 for (i = 0; argv_init[i]; i++) { 522 if (i == MAX_INIT_ARGS) { 523 panic_later = "init"; 524 panic_param = param; 525 return 0; 526 } 527 } 528 argv_init[i] = param; 529 return 0; 530} 531 532/* 533 * Unknown boot options get handed to init, unless they look like 534 * unused parameters (modprobe will find them in /proc/cmdline). 535 */ 536static int __init unknown_bootoption(char *param, char *val, 537 const char *unused, void *arg) 538{ 539 size_t len = strlen(param); 540 541 /* Handle params aliased to sysctls */ 542 if (sysctl_is_alias(param)) 543 return 0; 544 545 repair_env_string(param, val); 546 547 /* Handle obsolete-style parameters */ 548 if (obsolete_checksetup(param)) 549 return 0; 550 551 /* Unused module parameter. */ 552 if (strnchr(param, len, '.')) 553 return 0; 554 555 if (panic_later) 556 return 0; 557 558 if (val) { 559 /* Environment option */ 560 unsigned int i; 561 for (i = 0; envp_init[i]; i++) { 562 if (i == MAX_INIT_ENVS) { 563 panic_later = "env"; 564 panic_param = param; 565 } 566 if (!strncmp(param, envp_init[i], len+1)) 567 break; 568 } 569 envp_init[i] = param; 570 } else { 571 /* Command line option */ 572 unsigned int i; 573 for (i = 0; argv_init[i]; i++) { 574 if (i == MAX_INIT_ARGS) { 575 panic_later = "init"; 576 panic_param = param; 577 } 578 } 579 argv_init[i] = param; 580 } 581 return 0; 582} 583 584static int __init init_setup(char *str) 585{ 586 unsigned int i; 587 588 execute_command = str; 589 /* 590 * In case LILO is going to boot us with default command line, 591 * it prepends "auto" before the whole cmdline which makes 592 * the shell think it should execute a script with such name. 593 * So we ignore all arguments entered _before_ init=... [MJ] 594 */ 595 for (i = 1; i < MAX_INIT_ARGS; i++) 596 argv_init[i] = NULL; 597 return 1; 598} 599__setup("init=", init_setup); 600 601static int __init rdinit_setup(char *str) 602{ 603 unsigned int i; 604 605 ramdisk_execute_command = str; 606 /* See "auto" comment in init_setup */ 607 for (i = 1; i < MAX_INIT_ARGS; i++) 608 argv_init[i] = NULL; 609 return 1; 610} 611__setup("rdinit=", rdinit_setup); 612 613#ifndef CONFIG_SMP 614static inline void setup_nr_cpu_ids(void) { } 615static inline void smp_prepare_cpus(unsigned int maxcpus) { } 616#endif 617 618/* 619 * We need to store the untouched command line for future reference. 620 * We also need to store the touched command line since the parameter 621 * parsing is performed in place, and we should allow a component to 622 * store reference of name/value for future reference. 623 */ 624static void __init setup_command_line(char *command_line) 625{ 626 size_t len, xlen = 0, ilen = 0; 627 628 if (extra_command_line) 629 xlen = strlen(extra_command_line); 630 if (extra_init_args) 631 ilen = strlen(extra_init_args) + 4; /* for " -- " */ 632 633 len = xlen + strlen(boot_command_line) + 1; 634 635 saved_command_line = memblock_alloc(len + ilen, SMP_CACHE_BYTES); 636 if (!saved_command_line) 637 panic("%s: Failed to allocate %zu bytes\n", __func__, len + ilen); 638 639 static_command_line = memblock_alloc(len, SMP_CACHE_BYTES); 640 if (!static_command_line) 641 panic("%s: Failed to allocate %zu bytes\n", __func__, len); 642 643 if (xlen) { 644 /* 645 * We have to put extra_command_line before boot command 646 * lines because there could be dashes (separator of init 647 * command line) in the command lines. 648 */ 649 strcpy(saved_command_line, extra_command_line); 650 strcpy(static_command_line, extra_command_line); 651 } 652 strcpy(saved_command_line + xlen, boot_command_line); 653 strcpy(static_command_line + xlen, command_line); 654 655 if (ilen) { 656 /* 657 * Append supplemental init boot args to saved_command_line 658 * so that user can check what command line options passed 659 * to init. 660 * The order should always be 661 * " -- "[bootconfig init-param][cmdline init-param] 662 */ 663 if (initargs_offs) { 664 len = xlen + initargs_offs; 665 strcpy(saved_command_line + len, extra_init_args); 666 len += ilen - 4; /* strlen(extra_init_args) */ 667 strcpy(saved_command_line + len, 668 boot_command_line + initargs_offs - 1); 669 } else { 670 len = strlen(saved_command_line); 671 strcpy(saved_command_line + len, " -- "); 672 len += 4; 673 strcpy(saved_command_line + len, extra_init_args); 674 } 675 } 676 677 saved_command_line_len = strlen(saved_command_line); 678} 679 680/* 681 * We need to finalize in a non-__init function or else race conditions 682 * between the root thread and the init thread may cause start_kernel to 683 * be reaped by free_initmem before the root thread has proceeded to 684 * cpu_idle. 685 * 686 * gcc-3.4 accidentally inlines this function, so use noinline. 687 */ 688 689static __initdata DECLARE_COMPLETION(kthreadd_done); 690 691static noinline void __ref __noreturn rest_init(void) 692{ 693 struct task_struct *tsk; 694 int pid; 695 696 rcu_scheduler_starting(); 697 /* 698 * We need to spawn init first so that it obtains pid 1, however 699 * the init task will end up wanting to create kthreads, which, if 700 * we schedule it before we create kthreadd, will OOPS. 701 */ 702 pid = user_mode_thread(kernel_init, NULL, CLONE_FS); 703 /* 704 * Pin init on the boot CPU. Task migration is not properly working 705 * until sched_init_smp() has been run. It will set the allowed 706 * CPUs for init to the non isolated CPUs. 707 */ 708 rcu_read_lock(); 709 tsk = find_task_by_pid_ns(pid, &init_pid_ns); 710 tsk->flags |= PF_NO_SETAFFINITY; 711 set_cpus_allowed_ptr(tsk, cpumask_of(smp_processor_id())); 712 rcu_read_unlock(); 713 714 numa_default_policy(); 715 pid = kernel_thread(kthreadd, NULL, NULL, CLONE_FS | CLONE_FILES); 716 rcu_read_lock(); 717 kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); 718 rcu_read_unlock(); 719 720 /* 721 * Enable might_sleep() and smp_processor_id() checks. 722 * They cannot be enabled earlier because with CONFIG_PREEMPTION=y 723 * kernel_thread() would trigger might_sleep() splats. With 724 * CONFIG_PREEMPT_VOLUNTARY=y the init task might have scheduled 725 * already, but it's stuck on the kthreadd_done completion. 726 */ 727 system_state = SYSTEM_SCHEDULING; 728 729 complete(&kthreadd_done); 730 731 /* 732 * The boot idle thread must execute schedule() 733 * at least once to get things moving: 734 */ 735 schedule_preempt_disabled(); 736 /* Call into cpu_idle with preempt disabled */ 737 cpu_startup_entry(CPUHP_ONLINE); 738} 739 740/* Check for early params. */ 741static int __init do_early_param(char *param, char *val, 742 const char *unused, void *arg) 743{ 744 const struct obs_kernel_param *p; 745 746 for (p = __setup_start; p < __setup_end; p++) { 747 if ((p->early && parameq(param, p->str)) || 748 (strcmp(param, "console") == 0 && 749 strcmp(p->str, "earlycon") == 0) 750 ) { 751 if (p->setup_func(val) != 0) 752 pr_warn("Malformed early option '%s'\n", param); 753 } 754 } 755 /* We accept everything at this stage. */ 756 return 0; 757} 758 759void __init parse_early_options(char *cmdline) 760{ 761 parse_args("early options", cmdline, NULL, 0, 0, 0, NULL, 762 do_early_param); 763} 764 765/* Arch code calls this early on, or if not, just before other parsing. */ 766void __init parse_early_param(void) 767{ 768 static int done __initdata; 769 static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata; 770 771 if (done) 772 return; 773 774 /* All fall through to do_early_param. */ 775 strscpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); 776 parse_early_options(tmp_cmdline); 777 done = 1; 778} 779 780void __init __weak arch_post_acpi_subsys_init(void) { } 781 782void __init __weak smp_setup_processor_id(void) 783{ 784} 785 786void __init __weak smp_prepare_boot_cpu(void) 787{ 788} 789 790# if THREAD_SIZE >= PAGE_SIZE 791void __init __weak thread_stack_cache_init(void) 792{ 793} 794#endif 795 796void __init __weak poking_init(void) { } 797 798void __init __weak pgtable_cache_init(void) { } 799 800void __init __weak trap_init(void) { } 801 802bool initcall_debug; 803core_param(initcall_debug, initcall_debug, bool, 0644); 804 805#ifdef TRACEPOINTS_ENABLED 806static void __init initcall_debug_enable(void); 807#else 808static inline void initcall_debug_enable(void) 809{ 810} 811#endif 812 813#ifdef CONFIG_RANDOMIZE_KSTACK_OFFSET 814DEFINE_STATIC_KEY_MAYBE_RO(CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT, 815 randomize_kstack_offset); 816DEFINE_PER_CPU(u32, kstack_offset); 817 818static int __init early_randomize_kstack_offset(char *buf) 819{ 820 int ret; 821 bool bool_result; 822 823 ret = kstrtobool(buf, &bool_result); 824 if (ret) 825 return ret; 826 827 if (bool_result) 828 static_branch_enable(&randomize_kstack_offset); 829 else 830 static_branch_disable(&randomize_kstack_offset); 831 return 0; 832} 833early_param("randomize_kstack_offset", early_randomize_kstack_offset); 834#endif 835 836static void __init print_unknown_bootoptions(void) 837{ 838 char *unknown_options; 839 char *end; 840 const char *const *p; 841 size_t len; 842 843 if (panic_later || (!argv_init[1] && !envp_init[2])) 844 return; 845 846 /* 847 * Determine how many options we have to print out, plus a space 848 * before each 849 */ 850 len = 1; /* null terminator */ 851 for (p = &argv_init[1]; *p; p++) { 852 len++; 853 len += strlen(*p); 854 } 855 for (p = &envp_init[2]; *p; p++) { 856 len++; 857 len += strlen(*p); 858 } 859 860 unknown_options = memblock_alloc(len, SMP_CACHE_BYTES); 861 if (!unknown_options) { 862 pr_err("%s: Failed to allocate %zu bytes\n", 863 __func__, len); 864 return; 865 } 866 end = unknown_options; 867 868 for (p = &argv_init[1]; *p; p++) 869 end += sprintf(end, " %s", *p); 870 for (p = &envp_init[2]; *p; p++) 871 end += sprintf(end, " %s", *p); 872 873 /* Start at unknown_options[1] to skip the initial space */ 874 pr_notice("Unknown kernel command line parameters \"%s\", will be passed to user space.\n", 875 &unknown_options[1]); 876 memblock_free(unknown_options, len); 877} 878 879asmlinkage __visible __init __no_sanitize_address __noreturn __no_stack_protector 880void start_kernel(void) 881{ 882 char *command_line; 883 char *after_dashes; 884 885 set_task_stack_end_magic(&init_task); 886 smp_setup_processor_id(); 887 debug_objects_early_init(); 888 init_vmlinux_build_id(); 889 890 cgroup_init_early(); 891 892 local_irq_disable(); 893 early_boot_irqs_disabled = true; 894 895 /* 896 * Interrupts are still disabled. Do necessary setups, then 897 * enable them. 898 */ 899 boot_cpu_init(); 900 page_address_init(); 901 pr_notice("%s", linux_banner); 902 early_security_init(); 903 setup_arch(&command_line); 904 setup_boot_config(); 905 setup_command_line(command_line); 906 setup_nr_cpu_ids(); 907 setup_per_cpu_areas(); 908 smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ 909 boot_cpu_hotplug_init(); 910 911 pr_notice("Kernel command line: %s\n", saved_command_line); 912 /* parameters may set static keys */ 913 jump_label_init(); 914 parse_early_param(); 915 after_dashes = parse_args("Booting kernel", 916 static_command_line, __start___param, 917 __stop___param - __start___param, 918 -1, -1, NULL, &unknown_bootoption); 919 print_unknown_bootoptions(); 920 if (!IS_ERR_OR_NULL(after_dashes)) 921 parse_args("Setting init args", after_dashes, NULL, 0, -1, -1, 922 NULL, set_init_arg); 923 if (extra_init_args) 924 parse_args("Setting extra init args", extra_init_args, 925 NULL, 0, -1, -1, NULL, set_init_arg); 926 927 /* Architectural and non-timekeeping rng init, before allocator init */ 928 random_init_early(command_line); 929 930 /* 931 * These use large bootmem allocations and must precede 932 * initalization of page allocator 933 */ 934 setup_log_buf(0); 935 vfs_caches_init_early(); 936 sort_main_extable(); 937 trap_init(); 938 mm_core_init(); 939 poking_init(); 940 ftrace_init(); 941 942 /* trace_printk can be enabled here */ 943 early_trace_init(); 944 945 /* 946 * Set up the scheduler prior starting any interrupts (such as the 947 * timer interrupt). Full topology setup happens at smp_init() 948 * time - but meanwhile we still have a functioning scheduler. 949 */ 950 sched_init(); 951 952 if (WARN(!irqs_disabled(), 953 "Interrupts were enabled *very* early, fixing it\n")) 954 local_irq_disable(); 955 radix_tree_init(); 956 maple_tree_init(); 957 958 /* 959 * Set up housekeeping before setting up workqueues to allow the unbound 960 * workqueue to take non-housekeeping into account. 961 */ 962 housekeeping_init(); 963 964 /* 965 * Allow workqueue creation and work item queueing/cancelling 966 * early. Work item execution depends on kthreads and starts after 967 * workqueue_init(). 968 */ 969 workqueue_init_early(); 970 971 rcu_init(); 972 973 /* Trace events are available after this */ 974 trace_init(); 975 976 if (initcall_debug) 977 initcall_debug_enable(); 978 979 context_tracking_init(); 980 /* init some links before init_ISA_irqs() */ 981 early_irq_init(); 982 init_IRQ(); 983 tick_init(); 984 rcu_init_nohz(); 985 init_timers(); 986 srcu_init(); 987 hrtimers_init(); 988 softirq_init(); 989 timekeeping_init(); 990 time_init(); 991 992 /* This must be after timekeeping is initialized */ 993 random_init(); 994 995 /* These make use of the fully initialized rng */ 996 kfence_init(); 997 boot_init_stack_canary(); 998 999 perf_event_init(); 1000 profile_init(); 1001 call_function_init(); 1002 WARN(!irqs_disabled(), "Interrupts were enabled early\n"); 1003 1004 early_boot_irqs_disabled = false; 1005 local_irq_enable(); 1006 1007 kmem_cache_init_late(); 1008 1009 /* 1010 * HACK ALERT! This is early. We're enabling the console before 1011 * we've done PCI setups etc, and console_init() must be aware of 1012 * this. But we do want output early, in case something goes wrong. 1013 */ 1014 console_init(); 1015 if (panic_later) 1016 panic("Too many boot %s vars at `%s'", panic_later, 1017 panic_param); 1018 1019 lockdep_init(); 1020 1021 /* 1022 * Need to run this when irqs are enabled, because it wants 1023 * to self-test [hard/soft]-irqs on/off lock inversion bugs 1024 * too: 1025 */ 1026 locking_selftest(); 1027 1028#ifdef CONFIG_BLK_DEV_INITRD 1029 if (initrd_start && !initrd_below_start_ok && 1030 page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { 1031 pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n", 1032 page_to_pfn(virt_to_page((void *)initrd_start)), 1033 min_low_pfn); 1034 initrd_start = 0; 1035 } 1036#endif 1037 setup_per_cpu_pageset(); 1038 numa_policy_init(); 1039 acpi_early_init(); 1040 if (late_time_init) 1041 late_time_init(); 1042 sched_clock_init(); 1043 calibrate_delay(); 1044 1045 arch_cpu_finalize_init(); 1046 1047 pid_idr_init(); 1048 anon_vma_init(); 1049#ifdef CONFIG_X86 1050 if (efi_enabled(EFI_RUNTIME_SERVICES)) 1051 efi_enter_virtual_mode(); 1052#endif 1053 thread_stack_cache_init(); 1054 cred_init(); 1055 fork_init(); 1056 proc_caches_init(); 1057 uts_ns_init(); 1058 key_init(); 1059 security_init(); 1060 dbg_late_init(); 1061 net_ns_init(); 1062 vfs_caches_init(); 1063 pagecache_init(); 1064 signals_init(); 1065 seq_file_init(); 1066 proc_root_init(); 1067 nsfs_init(); 1068 pidfs_init(); 1069 cpuset_init(); 1070 cgroup_init(); 1071 taskstats_init_early(); 1072 delayacct_init(); 1073 1074 acpi_subsystem_init(); 1075 arch_post_acpi_subsys_init(); 1076 kcsan_init(); 1077 1078 /* Do the rest non-__init'ed, we're now alive */ 1079 rest_init(); 1080 1081 /* 1082 * Avoid stack canaries in callers of boot_init_stack_canary for gcc-10 1083 * and older. 1084 */ 1085#if !__has_attribute(__no_stack_protector__) 1086 prevent_tail_call_optimization(); 1087#endif 1088} 1089 1090/* Call all constructor functions linked into the kernel. */ 1091static void __init do_ctors(void) 1092{ 1093/* 1094 * For UML, the constructors have already been called by the 1095 * normal setup code as it's just a normal ELF binary, so we 1096 * cannot do it again - but we do need CONFIG_CONSTRUCTORS 1097 * even on UML for modules. 1098 */ 1099#if defined(CONFIG_CONSTRUCTORS) && !defined(CONFIG_UML) 1100 ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; 1101 1102 for (; fn < (ctor_fn_t *) __ctors_end; fn++) 1103 (*fn)(); 1104#endif 1105} 1106 1107#ifdef CONFIG_KALLSYMS 1108struct blacklist_entry { 1109 struct list_head next; 1110 char *buf; 1111}; 1112 1113static __initdata_or_module LIST_HEAD(blacklisted_initcalls); 1114 1115static int __init initcall_blacklist(char *str) 1116{ 1117 char *str_entry; 1118 struct blacklist_entry *entry; 1119 1120 /* str argument is a comma-separated list of functions */ 1121 do { 1122 str_entry = strsep(&str, ","); 1123 if (str_entry) { 1124 pr_debug("blacklisting initcall %s\n", str_entry); 1125 entry = memblock_alloc(sizeof(*entry), 1126 SMP_CACHE_BYTES); 1127 if (!entry) 1128 panic("%s: Failed to allocate %zu bytes\n", 1129 __func__, sizeof(*entry)); 1130 entry->buf = memblock_alloc(strlen(str_entry) + 1, 1131 SMP_CACHE_BYTES); 1132 if (!entry->buf) 1133 panic("%s: Failed to allocate %zu bytes\n", 1134 __func__, strlen(str_entry) + 1); 1135 strcpy(entry->buf, str_entry); 1136 list_add(&entry->next, &blacklisted_initcalls); 1137 } 1138 } while (str_entry); 1139 1140 return 1; 1141} 1142 1143static bool __init_or_module initcall_blacklisted(initcall_t fn) 1144{ 1145 struct blacklist_entry *entry; 1146 char fn_name[KSYM_SYMBOL_LEN]; 1147 unsigned long addr; 1148 1149 if (list_empty(&blacklisted_initcalls)) 1150 return false; 1151 1152 addr = (unsigned long) dereference_function_descriptor(fn); 1153 sprint_symbol_no_offset(fn_name, addr); 1154 1155 /* 1156 * fn will be "function_name [module_name]" where [module_name] is not 1157 * displayed for built-in init functions. Strip off the [module_name]. 1158 */ 1159 strreplace(fn_name, ' ', '\0'); 1160 1161 list_for_each_entry(entry, &blacklisted_initcalls, next) { 1162 if (!strcmp(fn_name, entry->buf)) { 1163 pr_debug("initcall %s blacklisted\n", fn_name); 1164 return true; 1165 } 1166 } 1167 1168 return false; 1169} 1170#else 1171static int __init initcall_blacklist(char *str) 1172{ 1173 pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n"); 1174 return 0; 1175} 1176 1177static bool __init_or_module initcall_blacklisted(initcall_t fn) 1178{ 1179 return false; 1180} 1181#endif 1182__setup("initcall_blacklist=", initcall_blacklist); 1183 1184static __init_or_module void 1185trace_initcall_start_cb(void *data, initcall_t fn) 1186{ 1187 ktime_t *calltime = data; 1188 1189 printk(KERN_DEBUG "calling %pS @ %i\n", fn, task_pid_nr(current)); 1190 *calltime = ktime_get(); 1191} 1192 1193static __init_or_module void 1194trace_initcall_finish_cb(void *data, initcall_t fn, int ret) 1195{ 1196 ktime_t rettime, *calltime = data; 1197 1198 rettime = ktime_get(); 1199 printk(KERN_DEBUG "initcall %pS returned %d after %lld usecs\n", 1200 fn, ret, (unsigned long long)ktime_us_delta(rettime, *calltime)); 1201} 1202 1203static ktime_t initcall_calltime; 1204 1205#ifdef TRACEPOINTS_ENABLED 1206static void __init initcall_debug_enable(void) 1207{ 1208 int ret; 1209 1210 ret = register_trace_initcall_start(trace_initcall_start_cb, 1211 &initcall_calltime); 1212 ret |= register_trace_initcall_finish(trace_initcall_finish_cb, 1213 &initcall_calltime); 1214 WARN(ret, "Failed to register initcall tracepoints\n"); 1215} 1216# define do_trace_initcall_start trace_initcall_start 1217# define do_trace_initcall_finish trace_initcall_finish 1218#else 1219static inline void do_trace_initcall_start(initcall_t fn) 1220{ 1221 if (!initcall_debug) 1222 return; 1223 trace_initcall_start_cb(&initcall_calltime, fn); 1224} 1225static inline void do_trace_initcall_finish(initcall_t fn, int ret) 1226{ 1227 if (!initcall_debug) 1228 return; 1229 trace_initcall_finish_cb(&initcall_calltime, fn, ret); 1230} 1231#endif /* !TRACEPOINTS_ENABLED */ 1232 1233int __init_or_module do_one_initcall(initcall_t fn) 1234{ 1235 int count = preempt_count(); 1236 char msgbuf[64]; 1237 int ret; 1238 1239 if (initcall_blacklisted(fn)) 1240 return -EPERM; 1241 1242 do_trace_initcall_start(fn); 1243 ret = fn(); 1244 do_trace_initcall_finish(fn, ret); 1245 1246 msgbuf[0] = 0; 1247 1248 if (preempt_count() != count) { 1249 sprintf(msgbuf, "preemption imbalance "); 1250 preempt_count_set(count); 1251 } 1252 if (irqs_disabled()) { 1253 strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); 1254 local_irq_enable(); 1255 } 1256 WARN(msgbuf[0], "initcall %pS returned with %s\n", fn, msgbuf); 1257 1258 add_latent_entropy(); 1259 return ret; 1260} 1261 1262 1263static initcall_entry_t *initcall_levels[] __initdata = { 1264 __initcall0_start, 1265 __initcall1_start, 1266 __initcall2_start, 1267 __initcall3_start, 1268 __initcall4_start, 1269 __initcall5_start, 1270 __initcall6_start, 1271 __initcall7_start, 1272 __initcall_end, 1273}; 1274 1275/* Keep these in sync with initcalls in include/linux/init.h */ 1276static const char *initcall_level_names[] __initdata = { 1277 "pure", 1278 "core", 1279 "postcore", 1280 "arch", 1281 "subsys", 1282 "fs", 1283 "device", 1284 "late", 1285}; 1286 1287static int __init ignore_unknown_bootoption(char *param, char *val, 1288 const char *unused, void *arg) 1289{ 1290 return 0; 1291} 1292 1293static void __init do_initcall_level(int level, char *command_line) 1294{ 1295 initcall_entry_t *fn; 1296 1297 parse_args(initcall_level_names[level], 1298 command_line, __start___param, 1299 __stop___param - __start___param, 1300 level, level, 1301 NULL, ignore_unknown_bootoption); 1302 1303 trace_initcall_level(initcall_level_names[level]); 1304 for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++) 1305 do_one_initcall(initcall_from_entry(fn)); 1306} 1307 1308static void __init do_initcalls(void) 1309{ 1310 int level; 1311 size_t len = saved_command_line_len + 1; 1312 char *command_line; 1313 1314 command_line = kzalloc(len, GFP_KERNEL); 1315 if (!command_line) 1316 panic("%s: Failed to allocate %zu bytes\n", __func__, len); 1317 1318 for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) { 1319 /* Parser modifies command_line, restore it each time */ 1320 strcpy(command_line, saved_command_line); 1321 do_initcall_level(level, command_line); 1322 } 1323 1324 kfree(command_line); 1325} 1326 1327/* 1328 * Ok, the machine is now initialized. None of the devices 1329 * have been touched yet, but the CPU subsystem is up and 1330 * running, and memory and process management works. 1331 * 1332 * Now we can finally start doing some real work.. 1333 */ 1334static void __init do_basic_setup(void) 1335{ 1336 cpuset_init_smp(); 1337 driver_init(); 1338 init_irq_proc(); 1339 do_ctors(); 1340 do_initcalls(); 1341} 1342 1343static void __init do_pre_smp_initcalls(void) 1344{ 1345 initcall_entry_t *fn; 1346 1347 trace_initcall_level("early"); 1348 for (fn = __initcall_start; fn < __initcall0_start; fn++) 1349 do_one_initcall(initcall_from_entry(fn)); 1350} 1351 1352static int run_init_process(const char *init_filename) 1353{ 1354 const char *const *p; 1355 1356 argv_init[0] = init_filename; 1357 pr_info("Run %s as init process\n", init_filename); 1358 pr_debug(" with arguments:\n"); 1359 for (p = argv_init; *p; p++) 1360 pr_debug(" %s\n", *p); 1361 pr_debug(" with environment:\n"); 1362 for (p = envp_init; *p; p++) 1363 pr_debug(" %s\n", *p); 1364 return kernel_execve(init_filename, argv_init, envp_init); 1365} 1366 1367static int try_to_run_init_process(const char *init_filename) 1368{ 1369 int ret; 1370 1371 ret = run_init_process(init_filename); 1372 1373 if (ret && ret != -ENOENT) { 1374 pr_err("Starting init: %s exists but couldn't execute it (error %d)\n", 1375 init_filename, ret); 1376 } 1377 1378 return ret; 1379} 1380 1381static noinline void __init kernel_init_freeable(void); 1382 1383#if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX) 1384bool rodata_enabled __ro_after_init = true; 1385 1386#ifndef arch_parse_debug_rodata 1387static inline bool arch_parse_debug_rodata(char *str) { return false; } 1388#endif 1389 1390static int __init set_debug_rodata(char *str) 1391{ 1392 if (arch_parse_debug_rodata(str)) 1393 return 0; 1394 1395 if (str && !strcmp(str, "on")) 1396 rodata_enabled = true; 1397 else if (str && !strcmp(str, "off")) 1398 rodata_enabled = false; 1399 else 1400 pr_warn("Invalid option string for rodata: '%s'\n", str); 1401 return 0; 1402} 1403early_param("rodata", set_debug_rodata); 1404#endif 1405 1406static void mark_readonly(void) 1407{ 1408 if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX) && rodata_enabled) { 1409 /* 1410 * load_module() results in W+X mappings, which are cleaned 1411 * up with init_free_wq. Let's make sure that queued work is 1412 * flushed so that we don't hit false positives looking for 1413 * insecure pages which are W+X. 1414 */ 1415 flush_module_init_free_work(); 1416 mark_rodata_ro(); 1417 debug_checkwx(); 1418 rodata_test(); 1419 } else if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)) { 1420 pr_info("Kernel memory protection disabled.\n"); 1421 } else if (IS_ENABLED(CONFIG_ARCH_HAS_STRICT_KERNEL_RWX)) { 1422 pr_warn("Kernel memory protection not selected by kernel config.\n"); 1423 } else { 1424 pr_warn("This architecture does not have kernel memory protection.\n"); 1425 } 1426} 1427 1428void __weak free_initmem(void) 1429{ 1430 free_initmem_default(POISON_FREE_INITMEM); 1431} 1432 1433static int __ref kernel_init(void *unused) 1434{ 1435 int ret; 1436 1437 /* 1438 * Wait until kthreadd is all set-up. 1439 */ 1440 wait_for_completion(&kthreadd_done); 1441 1442 kernel_init_freeable(); 1443 /* need to finish all async __init code before freeing the memory */ 1444 async_synchronize_full(); 1445 1446 system_state = SYSTEM_FREEING_INITMEM; 1447 kprobe_free_init_mem(); 1448 ftrace_free_init_mem(); 1449 kgdb_free_init_mem(); 1450 exit_boot_config(); 1451 free_initmem(); 1452 mark_readonly(); 1453 1454 /* 1455 * Kernel mappings are now finalized - update the userspace page-table 1456 * to finalize PTI. 1457 */ 1458 pti_finalize(); 1459 1460 system_state = SYSTEM_RUNNING; 1461 numa_default_policy(); 1462 1463 rcu_end_inkernel_boot(); 1464 1465 do_sysctl_args(); 1466 1467 if (ramdisk_execute_command) { 1468 ret = run_init_process(ramdisk_execute_command); 1469 if (!ret) 1470 return 0; 1471 pr_err("Failed to execute %s (error %d)\n", 1472 ramdisk_execute_command, ret); 1473 } 1474 1475 /* 1476 * We try each of these until one succeeds. 1477 * 1478 * The Bourne shell can be used instead of init if we are 1479 * trying to recover a really broken machine. 1480 */ 1481 if (execute_command) { 1482 ret = run_init_process(execute_command); 1483 if (!ret) 1484 return 0; 1485 panic("Requested init %s failed (error %d).", 1486 execute_command, ret); 1487 } 1488 1489 if (CONFIG_DEFAULT_INIT[0] != '\0') { 1490 ret = run_init_process(CONFIG_DEFAULT_INIT); 1491 if (ret) 1492 pr_err("Default init %s failed (error %d)\n", 1493 CONFIG_DEFAULT_INIT, ret); 1494 else 1495 return 0; 1496 } 1497 1498 if (!try_to_run_init_process("/sbin/init") || 1499 !try_to_run_init_process("/etc/init") || 1500 !try_to_run_init_process("/bin/init") || 1501 !try_to_run_init_process("/bin/sh")) 1502 return 0; 1503 1504 panic("No working init found. Try passing init= option to kernel. " 1505 "See Linux Documentation/admin-guide/init.rst for guidance."); 1506} 1507 1508/* Open /dev/console, for stdin/stdout/stderr, this should never fail */ 1509void __init console_on_rootfs(void) 1510{ 1511 struct file *file = filp_open("/dev/console", O_RDWR, 0); 1512 1513 if (IS_ERR(file)) { 1514 pr_err("Warning: unable to open an initial console.\n"); 1515 return; 1516 } 1517 init_dup(file); 1518 init_dup(file); 1519 init_dup(file); 1520 fput(file); 1521} 1522 1523static noinline void __init kernel_init_freeable(void) 1524{ 1525 /* Now the scheduler is fully set up and can do blocking allocations */ 1526 gfp_allowed_mask = __GFP_BITS_MASK; 1527 1528 /* 1529 * init can allocate pages on any node 1530 */ 1531 set_mems_allowed(node_states[N_MEMORY]); 1532 1533 cad_pid = get_pid(task_pid(current)); 1534 1535 smp_prepare_cpus(setup_max_cpus); 1536 1537 workqueue_init(); 1538 1539 init_mm_internals(); 1540 1541 rcu_init_tasks_generic(); 1542 do_pre_smp_initcalls(); 1543 lockup_detector_init(); 1544 1545 smp_init(); 1546 sched_init_smp(); 1547 1548 workqueue_init_topology(); 1549 async_init(); 1550 padata_init(); 1551 page_alloc_init_late(); 1552 1553 do_basic_setup(); 1554 1555 kunit_run_all_tests(); 1556 1557 wait_for_initramfs(); 1558 console_on_rootfs(); 1559 1560 /* 1561 * check if there is an early userspace init. If yes, let it do all 1562 * the work 1563 */ 1564 if (init_eaccess(ramdisk_execute_command) != 0) { 1565 ramdisk_execute_command = NULL; 1566 prepare_namespace(); 1567 } 1568 1569 /* 1570 * Ok, we have completed the initial bootup, and 1571 * we're essentially up and running. Get rid of the 1572 * initmem segments and start the user-mode stuff.. 1573 * 1574 * rootfs is available now, try loading the public keys 1575 * and default modules 1576 */ 1577 1578 integrity_load_keys(); 1579} 1580