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/vmalloc.h> 38 #include <linux/kernel_stat.h> 39 #include <linux/start_kernel.h> 40 #include <linux/security.h> 41 #include <linux/smp.h> 42 #include <linux/profile.h> 43 #include <linux/rcupdate.h> 44 #include <linux/moduleparam.h> 45 #include <linux/kallsyms.h> 46 #include <linux/writeback.h> 47 #include <linux/cpu.h> 48 #include <linux/cpuset.h> 49 #include <linux/cgroup.h> 50 #include <linux/efi.h> 51 #include <linux/tick.h> 52 #include <linux/sched/isolation.h> 53 #include <linux/interrupt.h> 54 #include <linux/taskstats_kern.h> 55 #include <linux/delayacct.h> 56 #include <linux/unistd.h> 57 #include <linux/utsname.h> 58 #include <linux/rmap.h> 59 #include <linux/mempolicy.h> 60 #include <linux/key.h> 61 #include <linux/page_ext.h> 62 #include <linux/debug_locks.h> 63 #include <linux/debugobjects.h> 64 #include <linux/lockdep.h> 65 #include <linux/kmemleak.h> 66 #include <linux/padata.h> 67 #include <linux/pid_namespace.h> 68 #include <linux/device/driver.h> 69 #include <linux/kthread.h> 70 #include <linux/sched.h> 71 #include <linux/sched/init.h> 72 #include <linux/signal.h> 73 #include <linux/idr.h> 74 #include <linux/kgdb.h> 75 #include <linux/ftrace.h> 76 #include <linux/async.h> 77 #include <linux/shmem_fs.h> 78 #include <linux/slab.h> 79 #include <linux/perf_event.h> 80 #include <linux/ptrace.h> 81 #include <linux/pti.h> 82 #include <linux/blkdev.h> 83 #include <linux/elevator.h> 84 #include <linux/sched/clock.h> 85 #include <linux/sched/task.h> 86 #include <linux/sched/task_stack.h> 87 #include <linux/context_tracking.h> 88 #include <linux/random.h> 89 #include <linux/list.h> 90 #include <linux/integrity.h> 91 #include <linux/proc_ns.h> 92 #include <linux/io.h> 93 #include <linux/cache.h> 94 #include <linux/rodata_test.h> 95 #include <linux/jump_label.h> 96 #include <linux/mem_encrypt.h> 97 #include <linux/kcsan.h> 98 #include <linux/init_syscalls.h> 99 100 #include <asm/io.h> 101 #include <asm/bugs.h> 102 #include <asm/setup.h> 103 #include <asm/sections.h> 104 #include <asm/cacheflush.h> 105 106 #define CREATE_TRACE_POINTS 107 #include <trace/events/initcall.h> 108 109 #include <kunit/test.h> 110 111 static int kernel_init(void *); 112 113 extern void init_IRQ(void); 114 extern void radix_tree_init(void); 115 116 /* 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; 124 125 enum system_states system_state __read_mostly; 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 133 134 extern void time_init(void); 135 /* Default late time init is NULL. archs can override this later. */ 136 void (*__initdata late_time_init)(void); 137 138 /* Untouched command line saved by arch-specific code. */ 139 char __initdata boot_command_line[COMMAND_LINE_SIZE]; 140 /* Untouched saved command line (eg. for /proc) */ 141 char *saved_command_line; 142 /* Command line for parameter parsing */ 143 static char *static_command_line; 144 /* Untouched extra command line */ 145 static char *extra_command_line; 146 /* Extra init arguments */ 147 static char *extra_init_args; 148 149 #ifdef CONFIG_BOOT_CONFIG 150 /* Is bootconfig on command line? */ 151 static bool bootconfig_found; 152 static bool initargs_found; 153 #else 154 # define bootconfig_found false 155 # define initargs_found false 156 #endif 157 158 static char *execute_command; 159 static char *ramdisk_execute_command = "/init"; 160 161 /* 162 * Used to generate warnings if static_key manipulation functions are used 163 * before jump_label_init is called. 164 */ 165 bool static_key_initialized __read_mostly; 166 EXPORT_SYMBOL_GPL(static_key_initialized); 167 168 /* 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. 174 * For ex. kdump situation where previous kernel has crashed, BIOS has been 175 * skipped and devices will be in unknown state. 176 */ 177 unsigned int reset_devices; 178 EXPORT_SYMBOL(reset_devices); 179 180 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); 187 188 static const char *argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; 189 const char *envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; 190 static const char *panic_later, *panic_param; 191 192 extern const struct obs_kernel_param __setup_start[], __setup_end[]; 193 194 static bool __init obsolete_checksetup(char *line) 195 { 196 const struct obs_kernel_param *p; 197 bool had_early_param = false; 198 199 p = __setup_start; 200 do { 201 int n = strlen(p->str); 202 if (parameqn(line, p->str, n)) { 203 if (p->early) { 204 /* Already done in parse_early_param? 205 * (Needs exact match on param part). 206 * Keep iterating, as we can have early 207 * params and __setups of same names 8( */ 208 if (line[n] == '\0' || line[n] == '=') 209 had_early_param = true; 210 } else if (!p->setup_func) { 211 pr_warn("Parameter %s is obsolete, ignored\n", 212 p->str); 213 return true; 214 } else if (p->setup_func(line + n)) 215 return true; 216 } 217 p++; 218 } while (p < __setup_end); 219 220 return had_early_param; 221 } 222 223 /* 224 * This should be approx 2 Bo*oMips to start (note initial shift), and will 225 * still work even if initially too large, it will just take slightly longer 226 */ 227 unsigned long loops_per_jiffy = (1<<12); 228 EXPORT_SYMBOL(loops_per_jiffy); 229 230 static int __init debug_kernel(char *str) 231 { 232 console_loglevel = CONSOLE_LOGLEVEL_DEBUG; 233 return 0; 234 } 235 236 static int __init quiet_kernel(char *str) 237 { 238 console_loglevel = CONSOLE_LOGLEVEL_QUIET; 239 return 0; 240 } 241 242 early_param("debug", debug_kernel); 243 early_param("quiet", quiet_kernel); 244 245 static int __init loglevel(char *str) 246 { 247 int newlevel; 248 249 /* 250 * Only update loglevel value when a correct setting was passed, 251 * to prevent blind crashes (when loglevel being set to 0) that 252 * are quite hard to debug 253 */ 254 if (get_option(&str, &newlevel)) { 255 console_loglevel = newlevel; 256 return 0; 257 } 258 259 return -EINVAL; 260 } 261 262 early_param("loglevel", loglevel); 263 264 #ifdef CONFIG_BLK_DEV_INITRD 265 static void * __init get_boot_config_from_initrd(u32 *_size, u32 *_csum) 266 { 267 u32 size, csum; 268 char *data; 269 u32 *hdr; 270 int i; 271 272 if (!initrd_end) 273 return NULL; 274 275 data = (char *)initrd_end - BOOTCONFIG_MAGIC_LEN; 276 /* 277 * Since Grub may align the size of initrd to 4, we must 278 * check the preceding 3 bytes as well. 279 */ 280 for (i = 0; i < 4; i++) { 281 if (!memcmp(data, BOOTCONFIG_MAGIC, BOOTCONFIG_MAGIC_LEN)) 282 goto found; 283 data--; 284 } 285 return NULL; 286 287 found: 288 hdr = (u32 *)(data - 8); 289 size = le32_to_cpu(hdr[0]); 290 csum = le32_to_cpu(hdr[1]); 291 292 data = ((void *)hdr) - size; 293 if ((unsigned long)data < initrd_start) { 294 pr_err("bootconfig size %d is greater than initrd size %ld\n", 295 size, initrd_end - initrd_start); 296 return NULL; 297 } 298 299 /* Remove bootconfig from initramfs/initrd */ 300 initrd_end = (unsigned long)data; 301 if (_size) 302 *_size = size; 303 if (_csum) 304 *_csum = csum; 305 306 return data; 307 } 308 #else 309 static void * __init get_boot_config_from_initrd(u32 *_size, u32 *_csum) 310 { 311 return NULL; 312 } 313 #endif 314 315 #ifdef CONFIG_BOOT_CONFIG 316 317 static char xbc_namebuf[XBC_KEYLEN_MAX] __initdata; 318 319 #define rest(dst, end) ((end) > (dst) ? (end) - (dst) : 0) 320 321 static int __init xbc_snprint_cmdline(char *buf, size_t size, 322 struct xbc_node *root) 323 { 324 struct xbc_node *knode, *vnode; 325 char *end = buf + size; 326 const char *val; 327 int ret; 328 329 xbc_node_for_each_key_value(root, knode, val) { 330 ret = xbc_node_compose_key_after(root, knode, 331 xbc_namebuf, XBC_KEYLEN_MAX); 332 if (ret < 0) 333 return ret; 334 335 vnode = xbc_node_get_child(knode); 336 if (!vnode) { 337 ret = snprintf(buf, rest(buf, end), "%s ", xbc_namebuf); 338 if (ret < 0) 339 return ret; 340 buf += ret; 341 continue; 342 } 343 xbc_array_for_each_value(vnode, val) { 344 ret = snprintf(buf, rest(buf, end), "%s=\"%s\" ", 345 xbc_namebuf, val); 346 if (ret < 0) 347 return ret; 348 buf += ret; 349 } 350 } 351 352 return buf - (end - size); 353 } 354 #undef rest 355 356 /* Make an extra command line under given key word */ 357 static char * __init xbc_make_cmdline(const char *key) 358 { 359 struct xbc_node *root; 360 char *new_cmdline; 361 int ret, len = 0; 362 363 root = xbc_find_node(key); 364 if (!root) 365 return NULL; 366 367 /* Count required buffer size */ 368 len = xbc_snprint_cmdline(NULL, 0, root); 369 if (len <= 0) 370 return NULL; 371 372 new_cmdline = memblock_alloc(len + 1, SMP_CACHE_BYTES); 373 if (!new_cmdline) { 374 pr_err("Failed to allocate memory for extra kernel cmdline.\n"); 375 return NULL; 376 } 377 378 ret = xbc_snprint_cmdline(new_cmdline, len + 1, root); 379 if (ret < 0 || ret > len) { 380 pr_err("Failed to print extra kernel cmdline.\n"); 381 return NULL; 382 } 383 384 return new_cmdline; 385 } 386 387 static u32 boot_config_checksum(unsigned char *p, u32 size) 388 { 389 u32 ret = 0; 390 391 while (size--) 392 ret += *p++; 393 394 return ret; 395 } 396 397 static int __init bootconfig_params(char *param, char *val, 398 const char *unused, void *arg) 399 { 400 if (strcmp(param, "bootconfig") == 0) { 401 bootconfig_found = true; 402 } 403 return 0; 404 } 405 406 static void __init setup_boot_config(const char *cmdline) 407 { 408 static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata; 409 const char *msg; 410 int pos; 411 u32 size, csum; 412 char *data, *copy, *err; 413 int ret; 414 415 /* Cut out the bootconfig data even if we have no bootconfig option */ 416 data = get_boot_config_from_initrd(&size, &csum); 417 418 strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); 419 err = parse_args("bootconfig", tmp_cmdline, NULL, 0, 0, 0, NULL, 420 bootconfig_params); 421 422 if (IS_ERR(err) || !bootconfig_found) 423 return; 424 425 /* parse_args() stops at '--' and returns an address */ 426 if (err) 427 initargs_found = true; 428 429 if (!data) { 430 pr_err("'bootconfig' found on command line, but no bootconfig found\n"); 431 return; 432 } 433 434 if (size >= XBC_DATA_MAX) { 435 pr_err("bootconfig size %d greater than max size %d\n", 436 size, XBC_DATA_MAX); 437 return; 438 } 439 440 if (boot_config_checksum((unsigned char *)data, size) != csum) { 441 pr_err("bootconfig checksum failed\n"); 442 return; 443 } 444 445 copy = memblock_alloc(size + 1, SMP_CACHE_BYTES); 446 if (!copy) { 447 pr_err("Failed to allocate memory for bootconfig\n"); 448 return; 449 } 450 451 memcpy(copy, data, size); 452 copy[size] = '\0'; 453 454 ret = xbc_init(copy, &msg, &pos); 455 if (ret < 0) { 456 if (pos < 0) 457 pr_err("Failed to init bootconfig: %s.\n", msg); 458 else 459 pr_err("Failed to parse bootconfig: %s at %d.\n", 460 msg, pos); 461 } else { 462 pr_info("Load bootconfig: %d bytes %d nodes\n", size, ret); 463 /* keys starting with "kernel." are passed via cmdline */ 464 extra_command_line = xbc_make_cmdline("kernel"); 465 /* Also, "init." keys are init arguments */ 466 extra_init_args = xbc_make_cmdline("init"); 467 } 468 return; 469 } 470 471 #else 472 473 static void __init setup_boot_config(const char *cmdline) 474 { 475 /* Remove bootconfig data from initrd */ 476 get_boot_config_from_initrd(NULL, NULL); 477 } 478 479 static int __init warn_bootconfig(char *str) 480 { 481 pr_warn("WARNING: 'bootconfig' found on the kernel command line but CONFIG_BOOT_CONFIG is not set.\n"); 482 return 0; 483 } 484 early_param("bootconfig", warn_bootconfig); 485 486 #endif 487 488 /* Change NUL term back to "=", to make "param" the whole string. */ 489 static void __init repair_env_string(char *param, char *val) 490 { 491 if (val) { 492 /* param=val or param="val"? */ 493 if (val == param+strlen(param)+1) 494 val[-1] = '='; 495 else if (val == param+strlen(param)+2) { 496 val[-2] = '='; 497 memmove(val-1, val, strlen(val)+1); 498 } else 499 BUG(); 500 } 501 } 502 503 /* Anything after -- gets handed straight to init. */ 504 static int __init set_init_arg(char *param, char *val, 505 const char *unused, void *arg) 506 { 507 unsigned int i; 508 509 if (panic_later) 510 return 0; 511 512 repair_env_string(param, val); 513 514 for (i = 0; argv_init[i]; i++) { 515 if (i == MAX_INIT_ARGS) { 516 panic_later = "init"; 517 panic_param = param; 518 return 0; 519 } 520 } 521 argv_init[i] = param; 522 return 0; 523 } 524 525 /* 526 * Unknown boot options get handed to init, unless they look like 527 * unused parameters (modprobe will find them in /proc/cmdline). 528 */ 529 static int __init unknown_bootoption(char *param, char *val, 530 const char *unused, void *arg) 531 { 532 size_t len = strlen(param); 533 534 repair_env_string(param, val); 535 536 /* Handle obsolete-style parameters */ 537 if (obsolete_checksetup(param)) 538 return 0; 539 540 /* Unused module parameter. */ 541 if (strnchr(param, len, '.')) 542 return 0; 543 544 if (panic_later) 545 return 0; 546 547 if (val) { 548 /* Environment option */ 549 unsigned int i; 550 for (i = 0; envp_init[i]; i++) { 551 if (i == MAX_INIT_ENVS) { 552 panic_later = "env"; 553 panic_param = param; 554 } 555 if (!strncmp(param, envp_init[i], len+1)) 556 break; 557 } 558 envp_init[i] = param; 559 } else { 560 /* Command line option */ 561 unsigned int i; 562 for (i = 0; argv_init[i]; i++) { 563 if (i == MAX_INIT_ARGS) { 564 panic_later = "init"; 565 panic_param = param; 566 } 567 } 568 argv_init[i] = param; 569 } 570 return 0; 571 } 572 573 static int __init init_setup(char *str) 574 { 575 unsigned int i; 576 577 execute_command = str; 578 /* 579 * In case LILO is going to boot us with default command line, 580 * it prepends "auto" before the whole cmdline which makes 581 * the shell think it should execute a script with such name. 582 * So we ignore all arguments entered _before_ init=... [MJ] 583 */ 584 for (i = 1; i < MAX_INIT_ARGS; i++) 585 argv_init[i] = NULL; 586 return 1; 587 } 588 __setup("init=", init_setup); 589 590 static int __init rdinit_setup(char *str) 591 { 592 unsigned int i; 593 594 ramdisk_execute_command = str; 595 /* See "auto" comment in init_setup */ 596 for (i = 1; i < MAX_INIT_ARGS; i++) 597 argv_init[i] = NULL; 598 return 1; 599 } 600 __setup("rdinit=", rdinit_setup); 601 602 #ifndef CONFIG_SMP 603 static const unsigned int setup_max_cpus = NR_CPUS; 604 static inline void setup_nr_cpu_ids(void) { } 605 static inline void smp_prepare_cpus(unsigned int maxcpus) { } 606 #endif 607 608 /* 609 * We need to store the untouched command line for future reference. 610 * We also need to store the touched command line since the parameter 611 * parsing is performed in place, and we should allow a component to 612 * store reference of name/value for future reference. 613 */ 614 static void __init setup_command_line(char *command_line) 615 { 616 size_t len, xlen = 0, ilen = 0; 617 618 if (extra_command_line) 619 xlen = strlen(extra_command_line); 620 if (extra_init_args) 621 ilen = strlen(extra_init_args) + 4; /* for " -- " */ 622 623 len = xlen + strlen(boot_command_line) + 1; 624 625 saved_command_line = memblock_alloc(len + ilen, SMP_CACHE_BYTES); 626 if (!saved_command_line) 627 panic("%s: Failed to allocate %zu bytes\n", __func__, len + ilen); 628 629 static_command_line = memblock_alloc(len, SMP_CACHE_BYTES); 630 if (!static_command_line) 631 panic("%s: Failed to allocate %zu bytes\n", __func__, len); 632 633 if (xlen) { 634 /* 635 * We have to put extra_command_line before boot command 636 * lines because there could be dashes (separator of init 637 * command line) in the command lines. 638 */ 639 strcpy(saved_command_line, extra_command_line); 640 strcpy(static_command_line, extra_command_line); 641 } 642 strcpy(saved_command_line + xlen, boot_command_line); 643 strcpy(static_command_line + xlen, command_line); 644 645 if (ilen) { 646 /* 647 * Append supplemental init boot args to saved_command_line 648 * so that user can check what command line options passed 649 * to init. 650 */ 651 len = strlen(saved_command_line); 652 if (initargs_found) { 653 saved_command_line[len++] = ' '; 654 } else { 655 strcpy(saved_command_line + len, " -- "); 656 len += 4; 657 } 658 659 strcpy(saved_command_line + len, extra_init_args); 660 } 661 } 662 663 /* 664 * We need to finalize in a non-__init function or else race conditions 665 * between the root thread and the init thread may cause start_kernel to 666 * be reaped by free_initmem before the root thread has proceeded to 667 * cpu_idle. 668 * 669 * gcc-3.4 accidentally inlines this function, so use noinline. 670 */ 671 672 static __initdata DECLARE_COMPLETION(kthreadd_done); 673 674 noinline void __ref rest_init(void) 675 { 676 struct task_struct *tsk; 677 int pid; 678 679 rcu_scheduler_starting(); 680 /* 681 * We need to spawn init first so that it obtains pid 1, however 682 * the init task will end up wanting to create kthreads, which, if 683 * we schedule it before we create kthreadd, will OOPS. 684 */ 685 pid = kernel_thread(kernel_init, NULL, CLONE_FS); 686 /* 687 * Pin init on the boot CPU. Task migration is not properly working 688 * until sched_init_smp() has been run. It will set the allowed 689 * CPUs for init to the non isolated CPUs. 690 */ 691 rcu_read_lock(); 692 tsk = find_task_by_pid_ns(pid, &init_pid_ns); 693 set_cpus_allowed_ptr(tsk, cpumask_of(smp_processor_id())); 694 rcu_read_unlock(); 695 696 numa_default_policy(); 697 pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); 698 rcu_read_lock(); 699 kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); 700 rcu_read_unlock(); 701 702 /* 703 * Enable might_sleep() and smp_processor_id() checks. 704 * They cannot be enabled earlier because with CONFIG_PREEMPTION=y 705 * kernel_thread() would trigger might_sleep() splats. With 706 * CONFIG_PREEMPT_VOLUNTARY=y the init task might have scheduled 707 * already, but it's stuck on the kthreadd_done completion. 708 */ 709 system_state = SYSTEM_SCHEDULING; 710 711 complete(&kthreadd_done); 712 713 /* 714 * The boot idle thread must execute schedule() 715 * at least once to get things moving: 716 */ 717 schedule_preempt_disabled(); 718 /* Call into cpu_idle with preempt disabled */ 719 cpu_startup_entry(CPUHP_ONLINE); 720 } 721 722 /* Check for early params. */ 723 static int __init do_early_param(char *param, char *val, 724 const char *unused, void *arg) 725 { 726 const struct obs_kernel_param *p; 727 728 for (p = __setup_start; p < __setup_end; p++) { 729 if ((p->early && parameq(param, p->str)) || 730 (strcmp(param, "console") == 0 && 731 strcmp(p->str, "earlycon") == 0) 732 ) { 733 if (p->setup_func(val) != 0) 734 pr_warn("Malformed early option '%s'\n", param); 735 } 736 } 737 /* We accept everything at this stage. */ 738 return 0; 739 } 740 741 void __init parse_early_options(char *cmdline) 742 { 743 parse_args("early options", cmdline, NULL, 0, 0, 0, NULL, 744 do_early_param); 745 } 746 747 /* Arch code calls this early on, or if not, just before other parsing. */ 748 void __init parse_early_param(void) 749 { 750 static int done __initdata; 751 static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata; 752 753 if (done) 754 return; 755 756 /* All fall through to do_early_param. */ 757 strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); 758 parse_early_options(tmp_cmdline); 759 done = 1; 760 } 761 762 void __init __weak arch_post_acpi_subsys_init(void) { } 763 764 void __init __weak smp_setup_processor_id(void) 765 { 766 } 767 768 # if THREAD_SIZE >= PAGE_SIZE 769 void __init __weak thread_stack_cache_init(void) 770 { 771 } 772 #endif 773 774 void __init __weak mem_encrypt_init(void) { } 775 776 void __init __weak poking_init(void) { } 777 778 void __init __weak pgtable_cache_init(void) { } 779 780 bool initcall_debug; 781 core_param(initcall_debug, initcall_debug, bool, 0644); 782 783 #ifdef TRACEPOINTS_ENABLED 784 static void __init initcall_debug_enable(void); 785 #else 786 static inline void initcall_debug_enable(void) 787 { 788 } 789 #endif 790 791 /* Report memory auto-initialization states for this boot. */ 792 static void __init report_meminit(void) 793 { 794 const char *stack; 795 796 if (IS_ENABLED(CONFIG_INIT_STACK_ALL_PATTERN)) 797 stack = "all(pattern)"; 798 else if (IS_ENABLED(CONFIG_INIT_STACK_ALL_ZERO)) 799 stack = "all(zero)"; 800 else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL)) 801 stack = "byref_all(zero)"; 802 else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF)) 803 stack = "byref(zero)"; 804 else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_USER)) 805 stack = "__user(zero)"; 806 else 807 stack = "off"; 808 809 pr_info("mem auto-init: stack:%s, heap alloc:%s, heap free:%s\n", 810 stack, want_init_on_alloc(GFP_KERNEL) ? "on" : "off", 811 want_init_on_free() ? "on" : "off"); 812 if (want_init_on_free()) 813 pr_info("mem auto-init: clearing system memory may take some time...\n"); 814 } 815 816 /* 817 * Set up kernel memory allocators 818 */ 819 static void __init mm_init(void) 820 { 821 /* 822 * page_ext requires contiguous pages, 823 * bigger than MAX_ORDER unless SPARSEMEM. 824 */ 825 page_ext_init_flatmem(); 826 init_mem_debugging_and_hardening(); 827 report_meminit(); 828 mem_init(); 829 /* page_owner must be initialized after buddy is ready */ 830 page_ext_init_flatmem_late(); 831 kmem_cache_init(); 832 kmemleak_init(); 833 pgtable_init(); 834 debug_objects_mem_init(); 835 vmalloc_init(); 836 ioremap_huge_init(); 837 /* Should be run before the first non-init thread is created */ 838 init_espfix_bsp(); 839 /* Should be run after espfix64 is set up. */ 840 pti_init(); 841 } 842 843 void __init __weak arch_call_rest_init(void) 844 { 845 rest_init(); 846 } 847 848 asmlinkage __visible void __init __no_sanitize_address start_kernel(void) 849 { 850 char *command_line; 851 char *after_dashes; 852 853 set_task_stack_end_magic(&init_task); 854 smp_setup_processor_id(); 855 debug_objects_early_init(); 856 857 cgroup_init_early(); 858 859 local_irq_disable(); 860 early_boot_irqs_disabled = true; 861 862 /* 863 * Interrupts are still disabled. Do necessary setups, then 864 * enable them. 865 */ 866 boot_cpu_init(); 867 page_address_init(); 868 pr_notice("%s", linux_banner); 869 early_security_init(); 870 setup_arch(&command_line); 871 setup_boot_config(command_line); 872 setup_command_line(command_line); 873 setup_nr_cpu_ids(); 874 setup_per_cpu_areas(); 875 smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ 876 boot_cpu_hotplug_init(); 877 878 build_all_zonelists(NULL); 879 page_alloc_init(); 880 881 pr_notice("Kernel command line: %s\n", saved_command_line); 882 /* parameters may set static keys */ 883 jump_label_init(); 884 parse_early_param(); 885 after_dashes = parse_args("Booting kernel", 886 static_command_line, __start___param, 887 __stop___param - __start___param, 888 -1, -1, NULL, &unknown_bootoption); 889 if (!IS_ERR_OR_NULL(after_dashes)) 890 parse_args("Setting init args", after_dashes, NULL, 0, -1, -1, 891 NULL, set_init_arg); 892 if (extra_init_args) 893 parse_args("Setting extra init args", extra_init_args, 894 NULL, 0, -1, -1, NULL, set_init_arg); 895 896 /* 897 * These use large bootmem allocations and must precede 898 * kmem_cache_init() 899 */ 900 setup_log_buf(0); 901 vfs_caches_init_early(); 902 sort_main_extable(); 903 trap_init(); 904 mm_init(); 905 906 ftrace_init(); 907 908 /* trace_printk can be enabled here */ 909 early_trace_init(); 910 911 /* 912 * Set up the scheduler prior starting any interrupts (such as the 913 * timer interrupt). Full topology setup happens at smp_init() 914 * time - but meanwhile we still have a functioning scheduler. 915 */ 916 sched_init(); 917 /* 918 * Disable preemption - early bootup scheduling is extremely 919 * fragile until we cpu_idle() for the first time. 920 */ 921 preempt_disable(); 922 if (WARN(!irqs_disabled(), 923 "Interrupts were enabled *very* early, fixing it\n")) 924 local_irq_disable(); 925 radix_tree_init(); 926 927 /* 928 * Set up housekeeping before setting up workqueues to allow the unbound 929 * workqueue to take non-housekeeping into account. 930 */ 931 housekeeping_init(); 932 933 /* 934 * Allow workqueue creation and work item queueing/cancelling 935 * early. Work item execution depends on kthreads and starts after 936 * workqueue_init(). 937 */ 938 workqueue_init_early(); 939 940 rcu_init(); 941 942 /* Trace events are available after this */ 943 trace_init(); 944 945 if (initcall_debug) 946 initcall_debug_enable(); 947 948 context_tracking_init(); 949 /* init some links before init_ISA_irqs() */ 950 early_irq_init(); 951 init_IRQ(); 952 tick_init(); 953 rcu_init_nohz(); 954 init_timers(); 955 hrtimers_init(); 956 softirq_init(); 957 timekeeping_init(); 958 959 /* 960 * For best initial stack canary entropy, prepare it after: 961 * - setup_arch() for any UEFI RNG entropy and boot cmdline access 962 * - timekeeping_init() for ktime entropy used in rand_initialize() 963 * - rand_initialize() to get any arch-specific entropy like RDRAND 964 * - add_latent_entropy() to get any latent entropy 965 * - adding command line entropy 966 */ 967 rand_initialize(); 968 add_latent_entropy(); 969 add_device_randomness(command_line, strlen(command_line)); 970 boot_init_stack_canary(); 971 972 time_init(); 973 perf_event_init(); 974 profile_init(); 975 call_function_init(); 976 WARN(!irqs_disabled(), "Interrupts were enabled early\n"); 977 978 early_boot_irqs_disabled = false; 979 local_irq_enable(); 980 981 kmem_cache_init_late(); 982 983 /* 984 * HACK ALERT! This is early. We're enabling the console before 985 * we've done PCI setups etc, and console_init() must be aware of 986 * this. But we do want output early, in case something goes wrong. 987 */ 988 console_init(); 989 if (panic_later) 990 panic("Too many boot %s vars at `%s'", panic_later, 991 panic_param); 992 993 lockdep_init(); 994 995 /* 996 * Need to run this when irqs are enabled, because it wants 997 * to self-test [hard/soft]-irqs on/off lock inversion bugs 998 * too: 999 */ 1000 locking_selftest(); 1001 1002 /* 1003 * This needs to be called before any devices perform DMA 1004 * operations that might use the SWIOTLB bounce buffers. It will 1005 * mark the bounce buffers as decrypted so that their usage will 1006 * not cause "plain-text" data to be decrypted when accessed. 1007 */ 1008 mem_encrypt_init(); 1009 1010 #ifdef CONFIG_BLK_DEV_INITRD 1011 if (initrd_start && !initrd_below_start_ok && 1012 page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { 1013 pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n", 1014 page_to_pfn(virt_to_page((void *)initrd_start)), 1015 min_low_pfn); 1016 initrd_start = 0; 1017 } 1018 #endif 1019 setup_per_cpu_pageset(); 1020 numa_policy_init(); 1021 acpi_early_init(); 1022 if (late_time_init) 1023 late_time_init(); 1024 sched_clock_init(); 1025 calibrate_delay(); 1026 pid_idr_init(); 1027 anon_vma_init(); 1028 #ifdef CONFIG_X86 1029 if (efi_enabled(EFI_RUNTIME_SERVICES)) 1030 efi_enter_virtual_mode(); 1031 #endif 1032 thread_stack_cache_init(); 1033 cred_init(); 1034 fork_init(); 1035 proc_caches_init(); 1036 uts_ns_init(); 1037 key_init(); 1038 security_init(); 1039 dbg_late_init(); 1040 vfs_caches_init(); 1041 pagecache_init(); 1042 signals_init(); 1043 seq_file_init(); 1044 proc_root_init(); 1045 nsfs_init(); 1046 cpuset_init(); 1047 cgroup_init(); 1048 taskstats_init_early(); 1049 delayacct_init(); 1050 1051 poking_init(); 1052 check_bugs(); 1053 1054 acpi_subsystem_init(); 1055 arch_post_acpi_subsys_init(); 1056 kcsan_init(); 1057 1058 /* Do the rest non-__init'ed, we're now alive */ 1059 arch_call_rest_init(); 1060 1061 prevent_tail_call_optimization(); 1062 } 1063 1064 /* Call all constructor functions linked into the kernel. */ 1065 static void __init do_ctors(void) 1066 { 1067 /* 1068 * For UML, the constructors have already been called by the 1069 * normal setup code as it's just a normal ELF binary, so we 1070 * cannot do it again - but we do need CONFIG_CONSTRUCTORS 1071 * even on UML for modules. 1072 */ 1073 #if defined(CONFIG_CONSTRUCTORS) && !defined(CONFIG_UML) 1074 ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; 1075 1076 for (; fn < (ctor_fn_t *) __ctors_end; fn++) 1077 (*fn)(); 1078 #endif 1079 } 1080 1081 #ifdef CONFIG_KALLSYMS 1082 struct blacklist_entry { 1083 struct list_head next; 1084 char *buf; 1085 }; 1086 1087 static __initdata_or_module LIST_HEAD(blacklisted_initcalls); 1088 1089 static int __init initcall_blacklist(char *str) 1090 { 1091 char *str_entry; 1092 struct blacklist_entry *entry; 1093 1094 /* str argument is a comma-separated list of functions */ 1095 do { 1096 str_entry = strsep(&str, ","); 1097 if (str_entry) { 1098 pr_debug("blacklisting initcall %s\n", str_entry); 1099 entry = memblock_alloc(sizeof(*entry), 1100 SMP_CACHE_BYTES); 1101 if (!entry) 1102 panic("%s: Failed to allocate %zu bytes\n", 1103 __func__, sizeof(*entry)); 1104 entry->buf = memblock_alloc(strlen(str_entry) + 1, 1105 SMP_CACHE_BYTES); 1106 if (!entry->buf) 1107 panic("%s: Failed to allocate %zu bytes\n", 1108 __func__, strlen(str_entry) + 1); 1109 strcpy(entry->buf, str_entry); 1110 list_add(&entry->next, &blacklisted_initcalls); 1111 } 1112 } while (str_entry); 1113 1114 return 0; 1115 } 1116 1117 static bool __init_or_module initcall_blacklisted(initcall_t fn) 1118 { 1119 struct blacklist_entry *entry; 1120 char fn_name[KSYM_SYMBOL_LEN]; 1121 unsigned long addr; 1122 1123 if (list_empty(&blacklisted_initcalls)) 1124 return false; 1125 1126 addr = (unsigned long) dereference_function_descriptor(fn); 1127 sprint_symbol_no_offset(fn_name, addr); 1128 1129 /* 1130 * fn will be "function_name [module_name]" where [module_name] is not 1131 * displayed for built-in init functions. Strip off the [module_name]. 1132 */ 1133 strreplace(fn_name, ' ', '\0'); 1134 1135 list_for_each_entry(entry, &blacklisted_initcalls, next) { 1136 if (!strcmp(fn_name, entry->buf)) { 1137 pr_debug("initcall %s blacklisted\n", fn_name); 1138 return true; 1139 } 1140 } 1141 1142 return false; 1143 } 1144 #else 1145 static int __init initcall_blacklist(char *str) 1146 { 1147 pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n"); 1148 return 0; 1149 } 1150 1151 static bool __init_or_module initcall_blacklisted(initcall_t fn) 1152 { 1153 return false; 1154 } 1155 #endif 1156 __setup("initcall_blacklist=", initcall_blacklist); 1157 1158 static __init_or_module void 1159 trace_initcall_start_cb(void *data, initcall_t fn) 1160 { 1161 ktime_t *calltime = (ktime_t *)data; 1162 1163 printk(KERN_DEBUG "calling %pS @ %i\n", fn, task_pid_nr(current)); 1164 *calltime = ktime_get(); 1165 } 1166 1167 static __init_or_module void 1168 trace_initcall_finish_cb(void *data, initcall_t fn, int ret) 1169 { 1170 ktime_t *calltime = (ktime_t *)data; 1171 ktime_t delta, rettime; 1172 unsigned long long duration; 1173 1174 rettime = ktime_get(); 1175 delta = ktime_sub(rettime, *calltime); 1176 duration = (unsigned long long) ktime_to_ns(delta) >> 10; 1177 printk(KERN_DEBUG "initcall %pS returned %d after %lld usecs\n", 1178 fn, ret, duration); 1179 } 1180 1181 static ktime_t initcall_calltime; 1182 1183 #ifdef TRACEPOINTS_ENABLED 1184 static void __init initcall_debug_enable(void) 1185 { 1186 int ret; 1187 1188 ret = register_trace_initcall_start(trace_initcall_start_cb, 1189 &initcall_calltime); 1190 ret |= register_trace_initcall_finish(trace_initcall_finish_cb, 1191 &initcall_calltime); 1192 WARN(ret, "Failed to register initcall tracepoints\n"); 1193 } 1194 # define do_trace_initcall_start trace_initcall_start 1195 # define do_trace_initcall_finish trace_initcall_finish 1196 #else 1197 static inline void do_trace_initcall_start(initcall_t fn) 1198 { 1199 if (!initcall_debug) 1200 return; 1201 trace_initcall_start_cb(&initcall_calltime, fn); 1202 } 1203 static inline void do_trace_initcall_finish(initcall_t fn, int ret) 1204 { 1205 if (!initcall_debug) 1206 return; 1207 trace_initcall_finish_cb(&initcall_calltime, fn, ret); 1208 } 1209 #endif /* !TRACEPOINTS_ENABLED */ 1210 1211 int __init_or_module do_one_initcall(initcall_t fn) 1212 { 1213 int count = preempt_count(); 1214 char msgbuf[64]; 1215 int ret; 1216 1217 if (initcall_blacklisted(fn)) 1218 return -EPERM; 1219 1220 do_trace_initcall_start(fn); 1221 ret = fn(); 1222 do_trace_initcall_finish(fn, ret); 1223 1224 msgbuf[0] = 0; 1225 1226 if (preempt_count() != count) { 1227 sprintf(msgbuf, "preemption imbalance "); 1228 preempt_count_set(count); 1229 } 1230 if (irqs_disabled()) { 1231 strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); 1232 local_irq_enable(); 1233 } 1234 WARN(msgbuf[0], "initcall %pS returned with %s\n", fn, msgbuf); 1235 1236 add_latent_entropy(); 1237 return ret; 1238 } 1239 1240 1241 extern initcall_entry_t __initcall_start[]; 1242 extern initcall_entry_t __initcall0_start[]; 1243 extern initcall_entry_t __initcall1_start[]; 1244 extern initcall_entry_t __initcall2_start[]; 1245 extern initcall_entry_t __initcall3_start[]; 1246 extern initcall_entry_t __initcall4_start[]; 1247 extern initcall_entry_t __initcall5_start[]; 1248 extern initcall_entry_t __initcall6_start[]; 1249 extern initcall_entry_t __initcall7_start[]; 1250 extern initcall_entry_t __initcall_end[]; 1251 1252 static initcall_entry_t *initcall_levels[] __initdata = { 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 1264 /* Keep these in sync with initcalls in include/linux/init.h */ 1265 static const char *initcall_level_names[] __initdata = { 1266 "pure", 1267 "core", 1268 "postcore", 1269 "arch", 1270 "subsys", 1271 "fs", 1272 "device", 1273 "late", 1274 }; 1275 1276 static int __init ignore_unknown_bootoption(char *param, char *val, 1277 const char *unused, void *arg) 1278 { 1279 return 0; 1280 } 1281 1282 static void __init do_initcall_level(int level, char *command_line) 1283 { 1284 initcall_entry_t *fn; 1285 1286 parse_args(initcall_level_names[level], 1287 command_line, __start___param, 1288 __stop___param - __start___param, 1289 level, level, 1290 NULL, ignore_unknown_bootoption); 1291 1292 trace_initcall_level(initcall_level_names[level]); 1293 for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++) 1294 do_one_initcall(initcall_from_entry(fn)); 1295 } 1296 1297 static void __init do_initcalls(void) 1298 { 1299 int level; 1300 size_t len = strlen(saved_command_line) + 1; 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 } 1312 1313 kfree(command_line); 1314 } 1315 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 { 1325 cpuset_init_smp(); 1326 driver_init(); 1327 init_irq_proc(); 1328 do_ctors(); 1329 usermodehelper_enable(); 1330 do_initcalls(); 1331 } 1332 1333 static void __init do_pre_smp_initcalls(void) 1334 { 1335 initcall_entry_t *fn; 1336 1337 trace_initcall_level("early"); 1338 for (fn = __initcall_start; fn < __initcall0_start; fn++) 1339 do_one_initcall(initcall_from_entry(fn)); 1340 } 1341 1342 static int run_init_process(const char *init_filename) 1343 { 1344 const char *const *p; 1345 1346 argv_init[0] = init_filename; 1347 pr_info("Run %s as init process\n", init_filename); 1348 pr_debug(" with arguments:\n"); 1349 for (p = argv_init; *p; p++) 1350 pr_debug(" %s\n", *p); 1351 pr_debug(" with environment:\n"); 1352 for (p = envp_init; *p; p++) 1353 pr_debug(" %s\n", *p); 1354 return kernel_execve(init_filename, argv_init, envp_init); 1355 } 1356 1357 static int try_to_run_init_process(const char *init_filename) 1358 { 1359 int ret; 1360 1361 ret = run_init_process(init_filename); 1362 1363 if (ret && ret != -ENOENT) { 1364 pr_err("Starting init: %s exists but couldn't execute it (error %d)\n", 1365 init_filename, ret); 1366 } 1367 1368 return ret; 1369 } 1370 1371 static noinline void __init kernel_init_freeable(void); 1372 1373 #if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX) 1374 bool rodata_enabled __ro_after_init = true; 1375 static int __init set_debug_rodata(char *str) 1376 { 1377 return strtobool(str, &rodata_enabled); 1378 } 1379 __setup("rodata=", set_debug_rodata); 1380 #endif 1381 1382 #ifdef CONFIG_STRICT_KERNEL_RWX 1383 static void mark_readonly(void) 1384 { 1385 if (rodata_enabled) { 1386 /* 1387 * load_module() results in W+X mappings, which are cleaned 1388 * up with call_rcu(). Let's make sure that queued work is 1389 * flushed so that we don't hit false positives looking for 1390 * insecure pages which are W+X. 1391 */ 1392 rcu_barrier(); 1393 mark_rodata_ro(); 1394 rodata_test(); 1395 } else 1396 pr_info("Kernel memory protection disabled.\n"); 1397 } 1398 #elif defined(CONFIG_ARCH_HAS_STRICT_KERNEL_RWX) 1399 static inline void mark_readonly(void) 1400 { 1401 pr_warn("Kernel memory protection not selected by kernel config.\n"); 1402 } 1403 #else 1404 static inline void mark_readonly(void) 1405 { 1406 pr_warn("This architecture does not have kernel memory protection.\n"); 1407 } 1408 #endif 1409 1410 void __weak free_initmem(void) 1411 { 1412 free_initmem_default(POISON_FREE_INITMEM); 1413 } 1414 1415 static int __ref kernel_init(void *unused) 1416 { 1417 int ret; 1418 1419 kernel_init_freeable(); 1420 /* need to finish all async __init code before freeing the memory */ 1421 async_synchronize_full(); 1422 kprobe_free_init_mem(); 1423 ftrace_free_init_mem(); 1424 free_initmem(); 1425 mark_readonly(); 1426 1427 /* 1428 * Kernel mappings are now finalized - update the userspace page-table 1429 * to finalize PTI. 1430 */ 1431 pti_finalize(); 1432 1433 system_state = SYSTEM_RUNNING; 1434 numa_default_policy(); 1435 1436 rcu_end_inkernel_boot(); 1437 1438 do_sysctl_args(); 1439 1440 if (ramdisk_execute_command) { 1441 ret = run_init_process(ramdisk_execute_command); 1442 if (!ret) 1443 return 0; 1444 pr_err("Failed to execute %s (error %d)\n", 1445 ramdisk_execute_command, ret); 1446 } 1447 1448 /* 1449 * We try each of these until one succeeds. 1450 * 1451 * The Bourne shell can be used instead of init if we are 1452 * trying to recover a really broken machine. 1453 */ 1454 if (execute_command) { 1455 ret = run_init_process(execute_command); 1456 if (!ret) 1457 return 0; 1458 panic("Requested init %s failed (error %d).", 1459 execute_command, ret); 1460 } 1461 1462 if (CONFIG_DEFAULT_INIT[0] != '\0') { 1463 ret = run_init_process(CONFIG_DEFAULT_INIT); 1464 if (ret) 1465 pr_err("Default init %s failed (error %d)\n", 1466 CONFIG_DEFAULT_INIT, ret); 1467 else 1468 return 0; 1469 } 1470 1471 if (!try_to_run_init_process("/sbin/init") || 1472 !try_to_run_init_process("/etc/init") || 1473 !try_to_run_init_process("/bin/init") || 1474 !try_to_run_init_process("/bin/sh")) 1475 return 0; 1476 1477 panic("No working init found. Try passing init= option to kernel. " 1478 "See Linux Documentation/admin-guide/init.rst for guidance."); 1479 } 1480 1481 /* Open /dev/console, for stdin/stdout/stderr, this should never fail */ 1482 void __init console_on_rootfs(void) 1483 { 1484 struct file *file = filp_open("/dev/console", O_RDWR, 0); 1485 1486 if (IS_ERR(file)) { 1487 pr_err("Warning: unable to open an initial console.\n"); 1488 return; 1489 } 1490 init_dup(file); 1491 init_dup(file); 1492 init_dup(file); 1493 fput(file); 1494 } 1495 1496 static noinline void __init kernel_init_freeable(void) 1497 { 1498 /* 1499 * Wait until kthreadd is all set-up. 1500 */ 1501 wait_for_completion(&kthreadd_done); 1502 1503 /* Now the scheduler is fully set up and can do blocking allocations */ 1504 gfp_allowed_mask = __GFP_BITS_MASK; 1505 1506 /* 1507 * init can allocate pages on any node 1508 */ 1509 set_mems_allowed(node_states[N_MEMORY]); 1510 1511 cad_pid = task_pid(current); 1512 1513 smp_prepare_cpus(setup_max_cpus); 1514 1515 workqueue_init(); 1516 1517 init_mm_internals(); 1518 1519 rcu_init_tasks_generic(); 1520 do_pre_smp_initcalls(); 1521 lockup_detector_init(); 1522 1523 smp_init(); 1524 sched_init_smp(); 1525 1526 padata_init(); 1527 page_alloc_init_late(); 1528 /* Initialize page ext after all struct pages are initialized. */ 1529 page_ext_init(); 1530 1531 do_basic_setup(); 1532 1533 kunit_run_all_tests(); 1534 1535 console_on_rootfs(); 1536 1537 /* 1538 * check if there is an early userspace init. If yes, let it do all 1539 * the work 1540 */ 1541 if (init_eaccess(ramdisk_execute_command) != 0) { 1542 ramdisk_execute_command = NULL; 1543 prepare_namespace(); 1544 } 1545 1546 /* 1547 * Ok, we have completed the initial bootup, and 1548 * we're essentially up and running. Get rid of the 1549 * initmem segments and start the user-mode stuff.. 1550 * 1551 * rootfs is available now, try loading the public keys 1552 * and default modules 1553 */ 1554 1555 integrity_load_keys(); 1556 } 1557