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 len = xlen + strlen(command_line) + 1; 640 641 static_command_line = memblock_alloc(len, SMP_CACHE_BYTES); 642 if (!static_command_line) 643 panic("%s: Failed to allocate %zu bytes\n", __func__, len); 644 645 if (xlen) { 646 /* 647 * We have to put extra_command_line before boot command 648 * lines because there could be dashes (separator of init 649 * command line) in the command lines. 650 */ 651 strcpy(saved_command_line, extra_command_line); 652 strcpy(static_command_line, extra_command_line); 653 } 654 strcpy(saved_command_line + xlen, boot_command_line); 655 strcpy(static_command_line + xlen, command_line); 656 657 if (ilen) { 658 /* 659 * Append supplemental init boot args to saved_command_line 660 * so that user can check what command line options passed 661 * to init. 662 * The order should always be 663 * " -- "[bootconfig init-param][cmdline init-param] 664 */ 665 if (initargs_offs) { 666 len = xlen + initargs_offs; 667 strcpy(saved_command_line + len, extra_init_args); 668 len += ilen - 4; /* strlen(extra_init_args) */ 669 strcpy(saved_command_line + len, 670 boot_command_line + initargs_offs - 1); 671 } else { 672 len = strlen(saved_command_line); 673 strcpy(saved_command_line + len, " -- "); 674 len += 4; 675 strcpy(saved_command_line + len, extra_init_args); 676 } 677 } 678 679 saved_command_line_len = strlen(saved_command_line); 680} 681 682/* 683 * We need to finalize in a non-__init function or else race conditions 684 * between the root thread and the init thread may cause start_kernel to 685 * be reaped by free_initmem before the root thread has proceeded to 686 * cpu_idle. 687 * 688 * gcc-3.4 accidentally inlines this function, so use noinline. 689 */ 690 691static __initdata DECLARE_COMPLETION(kthreadd_done); 692 693static noinline void __ref __noreturn rest_init(void) 694{ 695 struct task_struct *tsk; 696 int pid; 697 698 rcu_scheduler_starting(); 699 /* 700 * We need to spawn init first so that it obtains pid 1, however 701 * the init task will end up wanting to create kthreads, which, if 702 * we schedule it before we create kthreadd, will OOPS. 703 */ 704 pid = user_mode_thread(kernel_init, NULL, CLONE_FS); 705 /* 706 * Pin init on the boot CPU. Task migration is not properly working 707 * until sched_init_smp() has been run. It will set the allowed 708 * CPUs for init to the non isolated CPUs. 709 */ 710 rcu_read_lock(); 711 tsk = find_task_by_pid_ns(pid, &init_pid_ns); 712 tsk->flags |= PF_NO_SETAFFINITY; 713 set_cpus_allowed_ptr(tsk, cpumask_of(smp_processor_id())); 714 rcu_read_unlock(); 715 716 numa_default_policy(); 717 pid = kernel_thread(kthreadd, NULL, NULL, CLONE_FS | CLONE_FILES); 718 rcu_read_lock(); 719 kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); 720 rcu_read_unlock(); 721 722 /* 723 * Enable might_sleep() and smp_processor_id() checks. 724 * They cannot be enabled earlier because with CONFIG_PREEMPTION=y 725 * kernel_thread() would trigger might_sleep() splats. With 726 * CONFIG_PREEMPT_VOLUNTARY=y the init task might have scheduled 727 * already, but it's stuck on the kthreadd_done completion. 728 */ 729 system_state = SYSTEM_SCHEDULING; 730 731 complete(&kthreadd_done); 732 733 /* 734 * The boot idle thread must execute schedule() 735 * at least once to get things moving: 736 */ 737 schedule_preempt_disabled(); 738 /* Call into cpu_idle with preempt disabled */ 739 cpu_startup_entry(CPUHP_ONLINE); 740} 741 742/* Check for early params. */ 743static int __init do_early_param(char *param, char *val, 744 const char *unused, void *arg) 745{ 746 const struct obs_kernel_param *p; 747 748 for (p = __setup_start; p < __setup_end; p++) { 749 if ((p->early && parameq(param, p->str)) || 750 (strcmp(param, "console") == 0 && 751 strcmp(p->str, "earlycon") == 0) 752 ) { 753 if (p->setup_func(val) != 0) 754 pr_warn("Malformed early option '%s'\n", param); 755 } 756 } 757 /* We accept everything at this stage. */ 758 return 0; 759} 760 761void __init parse_early_options(char *cmdline) 762{ 763 parse_args("early options", cmdline, NULL, 0, 0, 0, NULL, 764 do_early_param); 765} 766 767/* Arch code calls this early on, or if not, just before other parsing. */ 768void __init parse_early_param(void) 769{ 770 static int done __initdata; 771 static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata; 772 773 if (done) 774 return; 775 776 /* All fall through to do_early_param. */ 777 strscpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); 778 parse_early_options(tmp_cmdline); 779 done = 1; 780} 781 782void __init __weak arch_post_acpi_subsys_init(void) { } 783 784void __init __weak smp_setup_processor_id(void) 785{ 786} 787 788void __init __weak smp_prepare_boot_cpu(void) 789{ 790} 791 792# if THREAD_SIZE >= PAGE_SIZE 793void __init __weak thread_stack_cache_init(void) 794{ 795} 796#endif 797 798void __init __weak poking_init(void) { } 799 800void __init __weak pgtable_cache_init(void) { } 801 802void __init __weak trap_init(void) { } 803 804bool initcall_debug; 805core_param(initcall_debug, initcall_debug, bool, 0644); 806 807#ifdef TRACEPOINTS_ENABLED 808static void __init initcall_debug_enable(void); 809#else 810static inline void initcall_debug_enable(void) 811{ 812} 813#endif 814 815#ifdef CONFIG_RANDOMIZE_KSTACK_OFFSET 816DEFINE_STATIC_KEY_MAYBE_RO(CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT, 817 randomize_kstack_offset); 818DEFINE_PER_CPU(u32, kstack_offset); 819 820static int __init early_randomize_kstack_offset(char *buf) 821{ 822 int ret; 823 bool bool_result; 824 825 ret = kstrtobool(buf, &bool_result); 826 if (ret) 827 return ret; 828 829 if (bool_result) 830 static_branch_enable(&randomize_kstack_offset); 831 else 832 static_branch_disable(&randomize_kstack_offset); 833 return 0; 834} 835early_param("randomize_kstack_offset", early_randomize_kstack_offset); 836#endif 837 838static void __init print_unknown_bootoptions(void) 839{ 840 char *unknown_options; 841 char *end; 842 const char *const *p; 843 size_t len; 844 845 if (panic_later || (!argv_init[1] && !envp_init[2])) 846 return; 847 848 /* 849 * Determine how many options we have to print out, plus a space 850 * before each 851 */ 852 len = 1; /* null terminator */ 853 for (p = &argv_init[1]; *p; p++) { 854 len++; 855 len += strlen(*p); 856 } 857 for (p = &envp_init[2]; *p; p++) { 858 len++; 859 len += strlen(*p); 860 } 861 862 unknown_options = memblock_alloc(len, SMP_CACHE_BYTES); 863 if (!unknown_options) { 864 pr_err("%s: Failed to allocate %zu bytes\n", 865 __func__, len); 866 return; 867 } 868 end = unknown_options; 869 870 for (p = &argv_init[1]; *p; p++) 871 end += sprintf(end, " %s", *p); 872 for (p = &envp_init[2]; *p; p++) 873 end += sprintf(end, " %s", *p); 874 875 /* Start at unknown_options[1] to skip the initial space */ 876 pr_notice("Unknown kernel command line parameters \"%s\", will be passed to user space.\n", 877 &unknown_options[1]); 878 memblock_free(unknown_options, len); 879} 880 881asmlinkage __visible __init __no_sanitize_address __noreturn __no_stack_protector 882void start_kernel(void) 883{ 884 char *command_line; 885 char *after_dashes; 886 887 set_task_stack_end_magic(&init_task); 888 smp_setup_processor_id(); 889 debug_objects_early_init(); 890 init_vmlinux_build_id(); 891 892 cgroup_init_early(); 893 894 local_irq_disable(); 895 early_boot_irqs_disabled = true; 896 897 /* 898 * Interrupts are still disabled. Do necessary setups, then 899 * enable them. 900 */ 901 boot_cpu_init(); 902 page_address_init(); 903 pr_notice("%s", linux_banner); 904 early_security_init(); 905 setup_arch(&command_line); 906 setup_boot_config(); 907 setup_command_line(command_line); 908 setup_nr_cpu_ids(); 909 setup_per_cpu_areas(); 910 smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ 911 boot_cpu_hotplug_init(); 912 913 pr_notice("Kernel command line: %s\n", saved_command_line); 914 /* parameters may set static keys */ 915 jump_label_init(); 916 parse_early_param(); 917 after_dashes = parse_args("Booting kernel", 918 static_command_line, __start___param, 919 __stop___param - __start___param, 920 -1, -1, NULL, &unknown_bootoption); 921 print_unknown_bootoptions(); 922 if (!IS_ERR_OR_NULL(after_dashes)) 923 parse_args("Setting init args", after_dashes, NULL, 0, -1, -1, 924 NULL, set_init_arg); 925 if (extra_init_args) 926 parse_args("Setting extra init args", extra_init_args, 927 NULL, 0, -1, -1, NULL, set_init_arg); 928 929 /* Architectural and non-timekeeping rng init, before allocator init */ 930 random_init_early(command_line); 931 932 /* 933 * These use large bootmem allocations and must precede 934 * initalization of page allocator 935 */ 936 setup_log_buf(0); 937 vfs_caches_init_early(); 938 sort_main_extable(); 939 trap_init(); 940 mm_core_init(); 941 poking_init(); 942 ftrace_init(); 943 944 /* trace_printk can be enabled here */ 945 early_trace_init(); 946 947 /* 948 * Set up the scheduler prior starting any interrupts (such as the 949 * timer interrupt). Full topology setup happens at smp_init() 950 * time - but meanwhile we still have a functioning scheduler. 951 */ 952 sched_init(); 953 954 if (WARN(!irqs_disabled(), 955 "Interrupts were enabled *very* early, fixing it\n")) 956 local_irq_disable(); 957 radix_tree_init(); 958 maple_tree_init(); 959 960 /* 961 * Set up housekeeping before setting up workqueues to allow the unbound 962 * workqueue to take non-housekeeping into account. 963 */ 964 housekeeping_init(); 965 966 /* 967 * Allow workqueue creation and work item queueing/cancelling 968 * early. Work item execution depends on kthreads and starts after 969 * workqueue_init(). 970 */ 971 workqueue_init_early(); 972 973 rcu_init(); 974 975 /* Trace events are available after this */ 976 trace_init(); 977 978 if (initcall_debug) 979 initcall_debug_enable(); 980 981 context_tracking_init(); 982 /* init some links before init_ISA_irqs() */ 983 early_irq_init(); 984 init_IRQ(); 985 tick_init(); 986 rcu_init_nohz(); 987 init_timers(); 988 srcu_init(); 989 hrtimers_init(); 990 softirq_init(); 991 timekeeping_init(); 992 time_init(); 993 994 /* This must be after timekeeping is initialized */ 995 random_init(); 996 997 /* These make use of the fully initialized rng */ 998 kfence_init(); 999 boot_init_stack_canary(); 1000 1001 perf_event_init(); 1002 profile_init(); 1003 call_function_init(); 1004 WARN(!irqs_disabled(), "Interrupts were enabled early\n"); 1005 1006 early_boot_irqs_disabled = false; 1007 local_irq_enable(); 1008 1009 kmem_cache_init_late(); 1010 1011 /* 1012 * HACK ALERT! This is early. We're enabling the console before 1013 * we've done PCI setups etc, and console_init() must be aware of 1014 * this. But we do want output early, in case something goes wrong. 1015 */ 1016 console_init(); 1017 if (panic_later) 1018 panic("Too many boot %s vars at `%s'", panic_later, 1019 panic_param); 1020 1021 lockdep_init(); 1022 1023 /* 1024 * Need to run this when irqs are enabled, because it wants 1025 * to self-test [hard/soft]-irqs on/off lock inversion bugs 1026 * too: 1027 */ 1028 locking_selftest(); 1029 1030#ifdef CONFIG_BLK_DEV_INITRD 1031 if (initrd_start && !initrd_below_start_ok && 1032 page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { 1033 pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n", 1034 page_to_pfn(virt_to_page((void *)initrd_start)), 1035 min_low_pfn); 1036 initrd_start = 0; 1037 } 1038#endif 1039 setup_per_cpu_pageset(); 1040 numa_policy_init(); 1041 acpi_early_init(); 1042 if (late_time_init) 1043 late_time_init(); 1044 sched_clock_init(); 1045 calibrate_delay(); 1046 1047 arch_cpu_finalize_init(); 1048 1049 pid_idr_init(); 1050 anon_vma_init(); 1051#ifdef CONFIG_X86 1052 if (efi_enabled(EFI_RUNTIME_SERVICES)) 1053 efi_enter_virtual_mode(); 1054#endif 1055 thread_stack_cache_init(); 1056 cred_init(); 1057 fork_init(); 1058 proc_caches_init(); 1059 uts_ns_init(); 1060 key_init(); 1061 security_init(); 1062 dbg_late_init(); 1063 net_ns_init(); 1064 vfs_caches_init(); 1065 pagecache_init(); 1066 signals_init(); 1067 seq_file_init(); 1068 proc_root_init(); 1069 nsfs_init(); 1070 pidfs_init(); 1071 cpuset_init(); 1072 cgroup_init(); 1073 taskstats_init_early(); 1074 delayacct_init(); 1075 1076 acpi_subsystem_init(); 1077 arch_post_acpi_subsys_init(); 1078 kcsan_init(); 1079 1080 /* Do the rest non-__init'ed, we're now alive */ 1081 rest_init(); 1082 1083 /* 1084 * Avoid stack canaries in callers of boot_init_stack_canary for gcc-10 1085 * and older. 1086 */ 1087#if !__has_attribute(__no_stack_protector__) 1088 prevent_tail_call_optimization(); 1089#endif 1090} 1091 1092/* Call all constructor functions linked into the kernel. */ 1093static void __init do_ctors(void) 1094{ 1095/* 1096 * For UML, the constructors have already been called by the 1097 * normal setup code as it's just a normal ELF binary, so we 1098 * cannot do it again - but we do need CONFIG_CONSTRUCTORS 1099 * even on UML for modules. 1100 */ 1101#if defined(CONFIG_CONSTRUCTORS) && !defined(CONFIG_UML) 1102 ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; 1103 1104 for (; fn < (ctor_fn_t *) __ctors_end; fn++) 1105 (*fn)(); 1106#endif 1107} 1108 1109#ifdef CONFIG_KALLSYMS 1110struct blacklist_entry { 1111 struct list_head next; 1112 char *buf; 1113}; 1114 1115static __initdata_or_module LIST_HEAD(blacklisted_initcalls); 1116 1117static int __init initcall_blacklist(char *str) 1118{ 1119 char *str_entry; 1120 struct blacklist_entry *entry; 1121 1122 /* str argument is a comma-separated list of functions */ 1123 do { 1124 str_entry = strsep(&str, ","); 1125 if (str_entry) { 1126 pr_debug("blacklisting initcall %s\n", str_entry); 1127 entry = memblock_alloc(sizeof(*entry), 1128 SMP_CACHE_BYTES); 1129 if (!entry) 1130 panic("%s: Failed to allocate %zu bytes\n", 1131 __func__, sizeof(*entry)); 1132 entry->buf = memblock_alloc(strlen(str_entry) + 1, 1133 SMP_CACHE_BYTES); 1134 if (!entry->buf) 1135 panic("%s: Failed to allocate %zu bytes\n", 1136 __func__, strlen(str_entry) + 1); 1137 strcpy(entry->buf, str_entry); 1138 list_add(&entry->next, &blacklisted_initcalls); 1139 } 1140 } while (str_entry); 1141 1142 return 1; 1143} 1144 1145static bool __init_or_module initcall_blacklisted(initcall_t fn) 1146{ 1147 struct blacklist_entry *entry; 1148 char fn_name[KSYM_SYMBOL_LEN]; 1149 unsigned long addr; 1150 1151 if (list_empty(&blacklisted_initcalls)) 1152 return false; 1153 1154 addr = (unsigned long) dereference_function_descriptor(fn); 1155 sprint_symbol_no_offset(fn_name, addr); 1156 1157 /* 1158 * fn will be "function_name [module_name]" where [module_name] is not 1159 * displayed for built-in init functions. Strip off the [module_name]. 1160 */ 1161 strreplace(fn_name, ' ', '\0'); 1162 1163 list_for_each_entry(entry, &blacklisted_initcalls, next) { 1164 if (!strcmp(fn_name, entry->buf)) { 1165 pr_debug("initcall %s blacklisted\n", fn_name); 1166 return true; 1167 } 1168 } 1169 1170 return false; 1171} 1172#else 1173static int __init initcall_blacklist(char *str) 1174{ 1175 pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n"); 1176 return 0; 1177} 1178 1179static bool __init_or_module initcall_blacklisted(initcall_t fn) 1180{ 1181 return false; 1182} 1183#endif 1184__setup("initcall_blacklist=", initcall_blacklist); 1185 1186static __init_or_module void 1187trace_initcall_start_cb(void *data, initcall_t fn) 1188{ 1189 ktime_t *calltime = data; 1190 1191 printk(KERN_DEBUG "calling %pS @ %i\n", fn, task_pid_nr(current)); 1192 *calltime = ktime_get(); 1193} 1194 1195static __init_or_module void 1196trace_initcall_finish_cb(void *data, initcall_t fn, int ret) 1197{ 1198 ktime_t rettime, *calltime = data; 1199 1200 rettime = ktime_get(); 1201 printk(KERN_DEBUG "initcall %pS returned %d after %lld usecs\n", 1202 fn, ret, (unsigned long long)ktime_us_delta(rettime, *calltime)); 1203} 1204 1205static ktime_t initcall_calltime; 1206 1207#ifdef TRACEPOINTS_ENABLED 1208static void __init initcall_debug_enable(void) 1209{ 1210 int ret; 1211 1212 ret = register_trace_initcall_start(trace_initcall_start_cb, 1213 &initcall_calltime); 1214 ret |= register_trace_initcall_finish(trace_initcall_finish_cb, 1215 &initcall_calltime); 1216 WARN(ret, "Failed to register initcall tracepoints\n"); 1217} 1218# define do_trace_initcall_start trace_initcall_start 1219# define do_trace_initcall_finish trace_initcall_finish 1220#else 1221static inline void do_trace_initcall_start(initcall_t fn) 1222{ 1223 if (!initcall_debug) 1224 return; 1225 trace_initcall_start_cb(&initcall_calltime, fn); 1226} 1227static inline void do_trace_initcall_finish(initcall_t fn, int ret) 1228{ 1229 if (!initcall_debug) 1230 return; 1231 trace_initcall_finish_cb(&initcall_calltime, fn, ret); 1232} 1233#endif /* !TRACEPOINTS_ENABLED */ 1234 1235int __init_or_module do_one_initcall(initcall_t fn) 1236{ 1237 int count = preempt_count(); 1238 char msgbuf[64]; 1239 int ret; 1240 1241 if (initcall_blacklisted(fn)) 1242 return -EPERM; 1243 1244 do_trace_initcall_start(fn); 1245 ret = fn(); 1246 do_trace_initcall_finish(fn, ret); 1247 1248 msgbuf[0] = 0; 1249 1250 if (preempt_count() != count) { 1251 sprintf(msgbuf, "preemption imbalance "); 1252 preempt_count_set(count); 1253 } 1254 if (irqs_disabled()) { 1255 strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); 1256 local_irq_enable(); 1257 } 1258 WARN(msgbuf[0], "initcall %pS returned with %s\n", fn, msgbuf); 1259 1260 add_latent_entropy(); 1261 return ret; 1262} 1263 1264 1265static initcall_entry_t *initcall_levels[] __initdata = { 1266 __initcall0_start, 1267 __initcall1_start, 1268 __initcall2_start, 1269 __initcall3_start, 1270 __initcall4_start, 1271 __initcall5_start, 1272 __initcall6_start, 1273 __initcall7_start, 1274 __initcall_end, 1275}; 1276 1277/* Keep these in sync with initcalls in include/linux/init.h */ 1278static const char *initcall_level_names[] __initdata = { 1279 "pure", 1280 "core", 1281 "postcore", 1282 "arch", 1283 "subsys", 1284 "fs", 1285 "device", 1286 "late", 1287}; 1288 1289static int __init ignore_unknown_bootoption(char *param, char *val, 1290 const char *unused, void *arg) 1291{ 1292 return 0; 1293} 1294 1295static void __init do_initcall_level(int level, char *command_line) 1296{ 1297 initcall_entry_t *fn; 1298 1299 parse_args(initcall_level_names[level], 1300 command_line, __start___param, 1301 __stop___param - __start___param, 1302 level, level, 1303 NULL, ignore_unknown_bootoption); 1304 1305 trace_initcall_level(initcall_level_names[level]); 1306 for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++) 1307 do_one_initcall(initcall_from_entry(fn)); 1308} 1309 1310static void __init do_initcalls(void) 1311{ 1312 int level; 1313 size_t len = saved_command_line_len + 1; 1314 char *command_line; 1315 1316 command_line = kzalloc(len, GFP_KERNEL); 1317 if (!command_line) 1318 panic("%s: Failed to allocate %zu bytes\n", __func__, len); 1319 1320 for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) { 1321 /* Parser modifies command_line, restore it each time */ 1322 strcpy(command_line, saved_command_line); 1323 do_initcall_level(level, command_line); 1324 } 1325 1326 kfree(command_line); 1327} 1328 1329/* 1330 * Ok, the machine is now initialized. None of the devices 1331 * have been touched yet, but the CPU subsystem is up and 1332 * running, and memory and process management works. 1333 * 1334 * Now we can finally start doing some real work.. 1335 */ 1336static void __init do_basic_setup(void) 1337{ 1338 cpuset_init_smp(); 1339 driver_init(); 1340 init_irq_proc(); 1341 do_ctors(); 1342 do_initcalls(); 1343} 1344 1345static void __init do_pre_smp_initcalls(void) 1346{ 1347 initcall_entry_t *fn; 1348 1349 trace_initcall_level("early"); 1350 for (fn = __initcall_start; fn < __initcall0_start; fn++) 1351 do_one_initcall(initcall_from_entry(fn)); 1352} 1353 1354static int run_init_process(const char *init_filename) 1355{ 1356 const char *const *p; 1357 1358 argv_init[0] = init_filename; 1359 pr_info("Run %s as init process\n", init_filename); 1360 pr_debug(" with arguments:\n"); 1361 for (p = argv_init; *p; p++) 1362 pr_debug(" %s\n", *p); 1363 pr_debug(" with environment:\n"); 1364 for (p = envp_init; *p; p++) 1365 pr_debug(" %s\n", *p); 1366 return kernel_execve(init_filename, argv_init, envp_init); 1367} 1368 1369static int try_to_run_init_process(const char *init_filename) 1370{ 1371 int ret; 1372 1373 ret = run_init_process(init_filename); 1374 1375 if (ret && ret != -ENOENT) { 1376 pr_err("Starting init: %s exists but couldn't execute it (error %d)\n", 1377 init_filename, ret); 1378 } 1379 1380 return ret; 1381} 1382 1383static noinline void __init kernel_init_freeable(void); 1384 1385#if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX) 1386bool rodata_enabled __ro_after_init = true; 1387 1388#ifndef arch_parse_debug_rodata 1389static inline bool arch_parse_debug_rodata(char *str) { return false; } 1390#endif 1391 1392static int __init set_debug_rodata(char *str) 1393{ 1394 if (arch_parse_debug_rodata(str)) 1395 return 0; 1396 1397 if (str && !strcmp(str, "on")) 1398 rodata_enabled = true; 1399 else if (str && !strcmp(str, "off")) 1400 rodata_enabled = false; 1401 else 1402 pr_warn("Invalid option string for rodata: '%s'\n", str); 1403 return 0; 1404} 1405early_param("rodata", set_debug_rodata); 1406#endif 1407 1408static void mark_readonly(void) 1409{ 1410 if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX) && rodata_enabled) { 1411 /* 1412 * load_module() results in W+X mappings, which are cleaned 1413 * up with init_free_wq. Let's make sure that queued work is 1414 * flushed so that we don't hit false positives looking for 1415 * insecure pages which are W+X. 1416 */ 1417 flush_module_init_free_work(); 1418 mark_rodata_ro(); 1419 debug_checkwx(); 1420 rodata_test(); 1421 } else if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)) { 1422 pr_info("Kernel memory protection disabled.\n"); 1423 } else if (IS_ENABLED(CONFIG_ARCH_HAS_STRICT_KERNEL_RWX)) { 1424 pr_warn("Kernel memory protection not selected by kernel config.\n"); 1425 } else { 1426 pr_warn("This architecture does not have kernel memory protection.\n"); 1427 } 1428} 1429 1430void __weak free_initmem(void) 1431{ 1432 free_initmem_default(POISON_FREE_INITMEM); 1433} 1434 1435static int __ref kernel_init(void *unused) 1436{ 1437 int ret; 1438 1439 /* 1440 * Wait until kthreadd is all set-up. 1441 */ 1442 wait_for_completion(&kthreadd_done); 1443 1444 kernel_init_freeable(); 1445 /* need to finish all async __init code before freeing the memory */ 1446 async_synchronize_full(); 1447 1448 system_state = SYSTEM_FREEING_INITMEM; 1449 kprobe_free_init_mem(); 1450 ftrace_free_init_mem(); 1451 kgdb_free_init_mem(); 1452 exit_boot_config(); 1453 free_initmem(); 1454 mark_readonly(); 1455 1456 /* 1457 * Kernel mappings are now finalized - update the userspace page-table 1458 * to finalize PTI. 1459 */ 1460 pti_finalize(); 1461 1462 system_state = SYSTEM_RUNNING; 1463 numa_default_policy(); 1464 1465 rcu_end_inkernel_boot(); 1466 1467 do_sysctl_args(); 1468 1469 if (ramdisk_execute_command) { 1470 ret = run_init_process(ramdisk_execute_command); 1471 if (!ret) 1472 return 0; 1473 pr_err("Failed to execute %s (error %d)\n", 1474 ramdisk_execute_command, ret); 1475 } 1476 1477 /* 1478 * We try each of these until one succeeds. 1479 * 1480 * The Bourne shell can be used instead of init if we are 1481 * trying to recover a really broken machine. 1482 */ 1483 if (execute_command) { 1484 ret = run_init_process(execute_command); 1485 if (!ret) 1486 return 0; 1487 panic("Requested init %s failed (error %d).", 1488 execute_command, ret); 1489 } 1490 1491 if (CONFIG_DEFAULT_INIT[0] != '\0') { 1492 ret = run_init_process(CONFIG_DEFAULT_INIT); 1493 if (ret) 1494 pr_err("Default init %s failed (error %d)\n", 1495 CONFIG_DEFAULT_INIT, ret); 1496 else 1497 return 0; 1498 } 1499 1500 if (!try_to_run_init_process("/sbin/init") || 1501 !try_to_run_init_process("/etc/init") || 1502 !try_to_run_init_process("/bin/init") || 1503 !try_to_run_init_process("/bin/sh")) 1504 return 0; 1505 1506 panic("No working init found. Try passing init= option to kernel. " 1507 "See Linux Documentation/admin-guide/init.rst for guidance."); 1508} 1509 1510/* Open /dev/console, for stdin/stdout/stderr, this should never fail */ 1511void __init console_on_rootfs(void) 1512{ 1513 struct file *file = filp_open("/dev/console", O_RDWR, 0); 1514 1515 if (IS_ERR(file)) { 1516 pr_err("Warning: unable to open an initial console.\n"); 1517 return; 1518 } 1519 init_dup(file); 1520 init_dup(file); 1521 init_dup(file); 1522 fput(file); 1523} 1524 1525static noinline void __init kernel_init_freeable(void) 1526{ 1527 /* Now the scheduler is fully set up and can do blocking allocations */ 1528 gfp_allowed_mask = __GFP_BITS_MASK; 1529 1530 /* 1531 * init can allocate pages on any node 1532 */ 1533 set_mems_allowed(node_states[N_MEMORY]); 1534 1535 cad_pid = get_pid(task_pid(current)); 1536 1537 smp_prepare_cpus(setup_max_cpus); 1538 1539 workqueue_init(); 1540 1541 init_mm_internals(); 1542 1543 rcu_init_tasks_generic(); 1544 do_pre_smp_initcalls(); 1545 lockup_detector_init(); 1546 1547 smp_init(); 1548 sched_init_smp(); 1549 1550 workqueue_init_topology(); 1551 async_init(); 1552 padata_init(); 1553 page_alloc_init_late(); 1554 1555 do_basic_setup(); 1556 1557 kunit_run_all_tests(); 1558 1559 wait_for_initramfs(); 1560 console_on_rootfs(); 1561 1562 /* 1563 * check if there is an early userspace init. If yes, let it do all 1564 * the work 1565 */ 1566 if (init_eaccess(ramdisk_execute_command) != 0) { 1567 ramdisk_execute_command = NULL; 1568 prepare_namespace(); 1569 } 1570 1571 /* 1572 * Ok, we have completed the initial bootup, and 1573 * we're essentially up and running. Get rid of the 1574 * initmem segments and start the user-mode stuff.. 1575 * 1576 * rootfs is available now, try loading the public keys 1577 * and default modules 1578 */ 1579 1580 integrity_load_keys(); 1581} 1582