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/sfi.h> 78 #include <linux/shmem_fs.h> 79 #include <linux/slab.h> 80 #include <linux/perf_event.h> 81 #include <linux/ptrace.h> 82 #include <linux/pti.h> 83 #include <linux/blkdev.h> 84 #include <linux/elevator.h> 85 #include <linux/sched/clock.h> 86 #include <linux/sched/task.h> 87 #include <linux/sched/task_stack.h> 88 #include <linux/context_tracking.h> 89 #include <linux/random.h> 90 #include <linux/list.h> 91 #include <linux/integrity.h> 92 #include <linux/proc_ns.h> 93 #include <linux/io.h> 94 #include <linux/cache.h> 95 #include <linux/rodata_test.h> 96 #include <linux/jump_label.h> 97 #include <linux/mem_encrypt.h> 98 #include <linux/kcsan.h> 99 #include <linux/init_syscalls.h> 100 101 #include <asm/io.h> 102 #include <asm/bugs.h> 103 #include <asm/setup.h> 104 #include <asm/sections.h> 105 #include <asm/cacheflush.h> 106 107 #define CREATE_TRACE_POINTS 108 #include <trace/events/initcall.h> 109 110 #include <kunit/test.h> 111 112 static int kernel_init(void *); 113 114 extern void init_IRQ(void); 115 extern void radix_tree_init(void); 116 117 /* 118 * Debug helper: via this flag we know that we are in 'early bootup code' 119 * where only the boot processor is running with IRQ disabled. This means 120 * two things - IRQ must not be enabled before the flag is cleared and some 121 * operations which are not allowed with IRQ disabled are allowed while the 122 * flag is set. 123 */ 124 bool early_boot_irqs_disabled __read_mostly; 125 126 enum system_states system_state __read_mostly; 127 EXPORT_SYMBOL(system_state); 128 129 /* 130 * Boot command-line arguments 131 */ 132 #define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT 133 #define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT 134 135 extern void time_init(void); 136 /* Default late time init is NULL. archs can override this later. */ 137 void (*__initdata late_time_init)(void); 138 139 /* Untouched command line saved by arch-specific code. */ 140 char __initdata boot_command_line[COMMAND_LINE_SIZE]; 141 /* Untouched saved command line (eg. for /proc) */ 142 char *saved_command_line; 143 /* Command line for parameter parsing */ 144 static char *static_command_line; 145 /* Untouched extra command line */ 146 static char *extra_command_line; 147 /* Extra init arguments */ 148 static char *extra_init_args; 149 150 #ifdef CONFIG_BOOT_CONFIG 151 /* Is bootconfig on command line? */ 152 static bool bootconfig_found; 153 static bool initargs_found; 154 #else 155 # define bootconfig_found false 156 # define initargs_found false 157 #endif 158 159 static char *execute_command; 160 static char *ramdisk_execute_command = "/init"; 161 162 /* 163 * Used to generate warnings if static_key manipulation functions are used 164 * before jump_label_init is called. 165 */ 166 bool static_key_initialized __read_mostly; 167 EXPORT_SYMBOL_GPL(static_key_initialized); 168 169 /* 170 * If set, this is an indication to the drivers that reset the underlying 171 * device before going ahead with the initialization otherwise driver might 172 * rely on the BIOS and skip the reset operation. 173 * 174 * This is useful if kernel is booting in an unreliable environment. 175 * For ex. kdump situation where previous kernel has crashed, BIOS has been 176 * skipped and devices will be in unknown state. 177 */ 178 unsigned int reset_devices; 179 EXPORT_SYMBOL(reset_devices); 180 181 static int __init set_reset_devices(char *str) 182 { 183 reset_devices = 1; 184 return 1; 185 } 186 187 __setup("reset_devices", set_reset_devices); 188 189 static const char *argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; 190 const char *envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; 191 static const char *panic_later, *panic_param; 192 193 extern const struct obs_kernel_param __setup_start[], __setup_end[]; 194 195 static 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 */ 228 unsigned long loops_per_jiffy = (1<<12); 229 EXPORT_SYMBOL(loops_per_jiffy); 230 231 static int __init debug_kernel(char *str) 232 { 233 console_loglevel = CONSOLE_LOGLEVEL_DEBUG; 234 return 0; 235 } 236 237 static int __init quiet_kernel(char *str) 238 { 239 console_loglevel = CONSOLE_LOGLEVEL_QUIET; 240 return 0; 241 } 242 243 early_param("debug", debug_kernel); 244 early_param("quiet", quiet_kernel); 245 246 static 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 } 262 263 early_param("loglevel", loglevel); 264 265 #ifdef CONFIG_BLK_DEV_INITRD 266 static void * __init get_boot_config_from_initrd(u32 *_size, u32 *_csum) 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; 287 288 found: 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 /* Remove bootconfig from initramfs/initrd */ 301 initrd_end = (unsigned long)data; 302 if (_size) 303 *_size = size; 304 if (_csum) 305 *_csum = csum; 306 307 return data; 308 } 309 #else 310 static void * __init get_boot_config_from_initrd(u32 *_size, u32 *_csum) 311 { 312 return NULL; 313 } 314 #endif 315 316 #ifdef CONFIG_BOOT_CONFIG 317 318 static char xbc_namebuf[XBC_KEYLEN_MAX] __initdata; 319 320 #define rest(dst, end) ((end) > (dst) ? (end) - (dst) : 0) 321 322 static int __init xbc_snprint_cmdline(char *buf, size_t size, 323 struct xbc_node *root) 324 { 325 struct xbc_node *knode, *vnode; 326 char *end = buf + size; 327 const char *val; 328 int ret; 329 330 xbc_node_for_each_key_value(root, knode, val) { 331 ret = xbc_node_compose_key_after(root, knode, 332 xbc_namebuf, XBC_KEYLEN_MAX); 333 if (ret < 0) 334 return ret; 335 336 vnode = xbc_node_get_child(knode); 337 if (!vnode) { 338 ret = snprintf(buf, rest(buf, end), "%s ", xbc_namebuf); 339 if (ret < 0) 340 return ret; 341 buf += ret; 342 continue; 343 } 344 xbc_array_for_each_value(vnode, val) { 345 ret = snprintf(buf, rest(buf, end), "%s=\"%s\" ", 346 xbc_namebuf, val); 347 if (ret < 0) 348 return ret; 349 buf += ret; 350 } 351 } 352 353 return buf - (end - size); 354 } 355 #undef rest 356 357 /* Make an extra command line under given key word */ 358 static char * __init xbc_make_cmdline(const char *key) 359 { 360 struct xbc_node *root; 361 char *new_cmdline; 362 int ret, len = 0; 363 364 root = xbc_find_node(key); 365 if (!root) 366 return NULL; 367 368 /* Count required buffer size */ 369 len = xbc_snprint_cmdline(NULL, 0, root); 370 if (len <= 0) 371 return NULL; 372 373 new_cmdline = memblock_alloc(len + 1, SMP_CACHE_BYTES); 374 if (!new_cmdline) { 375 pr_err("Failed to allocate memory for extra kernel cmdline.\n"); 376 return NULL; 377 } 378 379 ret = xbc_snprint_cmdline(new_cmdline, len + 1, root); 380 if (ret < 0 || ret > len) { 381 pr_err("Failed to print extra kernel cmdline.\n"); 382 return NULL; 383 } 384 385 return new_cmdline; 386 } 387 388 static u32 boot_config_checksum(unsigned char *p, u32 size) 389 { 390 u32 ret = 0; 391 392 while (size--) 393 ret += *p++; 394 395 return ret; 396 } 397 398 static int __init bootconfig_params(char *param, char *val, 399 const char *unused, void *arg) 400 { 401 if (strcmp(param, "bootconfig") == 0) { 402 bootconfig_found = true; 403 } 404 return 0; 405 } 406 407 static void __init setup_boot_config(const char *cmdline) 408 { 409 static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata; 410 const char *msg; 411 int pos; 412 u32 size, csum; 413 char *data, *copy, *err; 414 int ret; 415 416 /* Cut out the bootconfig data even if we have no bootconfig option */ 417 data = get_boot_config_from_initrd(&size, &csum); 418 419 strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); 420 err = parse_args("bootconfig", tmp_cmdline, NULL, 0, 0, 0, NULL, 421 bootconfig_params); 422 423 if (IS_ERR(err) || !bootconfig_found) 424 return; 425 426 /* parse_args() stops at '--' and returns an address */ 427 if (err) 428 initargs_found = true; 429 430 if (!data) { 431 pr_err("'bootconfig' found on command line, but no bootconfig found\n"); 432 return; 433 } 434 435 if (size >= XBC_DATA_MAX) { 436 pr_err("bootconfig size %d greater than max size %d\n", 437 size, XBC_DATA_MAX); 438 return; 439 } 440 441 if (boot_config_checksum((unsigned char *)data, size) != csum) { 442 pr_err("bootconfig checksum failed\n"); 443 return; 444 } 445 446 copy = memblock_alloc(size + 1, SMP_CACHE_BYTES); 447 if (!copy) { 448 pr_err("Failed to allocate memory for bootconfig\n"); 449 return; 450 } 451 452 memcpy(copy, data, size); 453 copy[size] = '\0'; 454 455 ret = xbc_init(copy, &msg, &pos); 456 if (ret < 0) { 457 if (pos < 0) 458 pr_err("Failed to init bootconfig: %s.\n", msg); 459 else 460 pr_err("Failed to parse bootconfig: %s at %d.\n", 461 msg, pos); 462 } else { 463 pr_info("Load bootconfig: %d bytes %d nodes\n", size, ret); 464 /* keys starting with "kernel." are passed via cmdline */ 465 extra_command_line = xbc_make_cmdline("kernel"); 466 /* Also, "init." keys are init arguments */ 467 extra_init_args = xbc_make_cmdline("init"); 468 } 469 return; 470 } 471 472 #else 473 474 static void __init setup_boot_config(const char *cmdline) 475 { 476 /* Remove bootconfig data from initrd */ 477 get_boot_config_from_initrd(NULL, NULL); 478 } 479 480 static int __init warn_bootconfig(char *str) 481 { 482 pr_warn("WARNING: 'bootconfig' found on the kernel command line but CONFIG_BOOT_CONFIG is not set.\n"); 483 return 0; 484 } 485 early_param("bootconfig", warn_bootconfig); 486 487 #endif 488 489 /* Change NUL term back to "=", to make "param" the whole string. */ 490 static void __init repair_env_string(char *param, char *val) 491 { 492 if (val) { 493 /* param=val or param="val"? */ 494 if (val == param+strlen(param)+1) 495 val[-1] = '='; 496 else if (val == param+strlen(param)+2) { 497 val[-2] = '='; 498 memmove(val-1, val, strlen(val)+1); 499 } else 500 BUG(); 501 } 502 } 503 504 /* Anything after -- gets handed straight to init. */ 505 static int __init set_init_arg(char *param, char *val, 506 const char *unused, void *arg) 507 { 508 unsigned int i; 509 510 if (panic_later) 511 return 0; 512 513 repair_env_string(param, val); 514 515 for (i = 0; argv_init[i]; i++) { 516 if (i == MAX_INIT_ARGS) { 517 panic_later = "init"; 518 panic_param = param; 519 return 0; 520 } 521 } 522 argv_init[i] = param; 523 return 0; 524 } 525 526 /* 527 * Unknown boot options get handed to init, unless they look like 528 * unused parameters (modprobe will find them in /proc/cmdline). 529 */ 530 static int __init unknown_bootoption(char *param, char *val, 531 const char *unused, void *arg) 532 { 533 size_t len = strlen(param); 534 535 repair_env_string(param, val); 536 537 /* Handle obsolete-style parameters */ 538 if (obsolete_checksetup(param)) 539 return 0; 540 541 /* Unused module parameter. */ 542 if (strnchr(param, len, '.')) 543 return 0; 544 545 if (panic_later) 546 return 0; 547 548 if (val) { 549 /* Environment option */ 550 unsigned int i; 551 for (i = 0; envp_init[i]; i++) { 552 if (i == MAX_INIT_ENVS) { 553 panic_later = "env"; 554 panic_param = param; 555 } 556 if (!strncmp(param, envp_init[i], len+1)) 557 break; 558 } 559 envp_init[i] = param; 560 } else { 561 /* Command line option */ 562 unsigned int i; 563 for (i = 0; argv_init[i]; i++) { 564 if (i == MAX_INIT_ARGS) { 565 panic_later = "init"; 566 panic_param = param; 567 } 568 } 569 argv_init[i] = param; 570 } 571 return 0; 572 } 573 574 static int __init init_setup(char *str) 575 { 576 unsigned int i; 577 578 execute_command = str; 579 /* 580 * In case LILO is going to boot us with default command line, 581 * it prepends "auto" before the whole cmdline which makes 582 * the shell think it should execute a script with such name. 583 * So we ignore all arguments entered _before_ init=... [MJ] 584 */ 585 for (i = 1; i < MAX_INIT_ARGS; i++) 586 argv_init[i] = NULL; 587 return 1; 588 } 589 __setup("init=", init_setup); 590 591 static int __init rdinit_setup(char *str) 592 { 593 unsigned int i; 594 595 ramdisk_execute_command = str; 596 /* See "auto" comment in init_setup */ 597 for (i = 1; i < MAX_INIT_ARGS; i++) 598 argv_init[i] = NULL; 599 return 1; 600 } 601 __setup("rdinit=", rdinit_setup); 602 603 #ifndef CONFIG_SMP 604 static const unsigned int setup_max_cpus = NR_CPUS; 605 static inline void setup_nr_cpu_ids(void) { } 606 static inline void smp_prepare_cpus(unsigned int maxcpus) { } 607 #endif 608 609 /* 610 * We need to store the untouched command line for future reference. 611 * We also need to store the touched command line since the parameter 612 * parsing is performed in place, and we should allow a component to 613 * store reference of name/value for future reference. 614 */ 615 static void __init setup_command_line(char *command_line) 616 { 617 size_t len, xlen = 0, ilen = 0; 618 619 if (extra_command_line) 620 xlen = strlen(extra_command_line); 621 if (extra_init_args) 622 ilen = strlen(extra_init_args) + 4; /* for " -- " */ 623 624 len = xlen + strlen(boot_command_line) + 1; 625 626 saved_command_line = memblock_alloc(len + ilen, SMP_CACHE_BYTES); 627 if (!saved_command_line) 628 panic("%s: Failed to allocate %zu bytes\n", __func__, len + ilen); 629 630 static_command_line = memblock_alloc(len, SMP_CACHE_BYTES); 631 if (!static_command_line) 632 panic("%s: Failed to allocate %zu bytes\n", __func__, len); 633 634 if (xlen) { 635 /* 636 * We have to put extra_command_line before boot command 637 * lines because there could be dashes (separator of init 638 * command line) in the command lines. 639 */ 640 strcpy(saved_command_line, extra_command_line); 641 strcpy(static_command_line, extra_command_line); 642 } 643 strcpy(saved_command_line + xlen, boot_command_line); 644 strcpy(static_command_line + xlen, command_line); 645 646 if (ilen) { 647 /* 648 * Append supplemental init boot args to saved_command_line 649 * so that user can check what command line options passed 650 * to init. 651 */ 652 len = strlen(saved_command_line); 653 if (initargs_found) { 654 saved_command_line[len++] = ' '; 655 } else { 656 strcpy(saved_command_line + len, " -- "); 657 len += 4; 658 } 659 660 strcpy(saved_command_line + len, extra_init_args); 661 } 662 } 663 664 /* 665 * We need to finalize in a non-__init function or else race conditions 666 * between the root thread and the init thread may cause start_kernel to 667 * be reaped by free_initmem before the root thread has proceeded to 668 * cpu_idle. 669 * 670 * gcc-3.4 accidentally inlines this function, so use noinline. 671 */ 672 673 static __initdata DECLARE_COMPLETION(kthreadd_done); 674 675 noinline void __ref rest_init(void) 676 { 677 struct task_struct *tsk; 678 int pid; 679 680 rcu_scheduler_starting(); 681 /* 682 * We need to spawn init first so that it obtains pid 1, however 683 * the init task will end up wanting to create kthreads, which, if 684 * we schedule it before we create kthreadd, will OOPS. 685 */ 686 pid = kernel_thread(kernel_init, NULL, CLONE_FS); 687 /* 688 * Pin init on the boot CPU. Task migration is not properly working 689 * until sched_init_smp() has been run. It will set the allowed 690 * CPUs for init to the non isolated CPUs. 691 */ 692 rcu_read_lock(); 693 tsk = find_task_by_pid_ns(pid, &init_pid_ns); 694 set_cpus_allowed_ptr(tsk, cpumask_of(smp_processor_id())); 695 rcu_read_unlock(); 696 697 numa_default_policy(); 698 pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); 699 rcu_read_lock(); 700 kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); 701 rcu_read_unlock(); 702 703 /* 704 * Enable might_sleep() and smp_processor_id() checks. 705 * They cannot be enabled earlier because with CONFIG_PREEMPTION=y 706 * kernel_thread() would trigger might_sleep() splats. With 707 * CONFIG_PREEMPT_VOLUNTARY=y the init task might have scheduled 708 * already, but it's stuck on the kthreadd_done completion. 709 */ 710 system_state = SYSTEM_SCHEDULING; 711 712 complete(&kthreadd_done); 713 714 /* 715 * The boot idle thread must execute schedule() 716 * at least once to get things moving: 717 */ 718 schedule_preempt_disabled(); 719 /* Call into cpu_idle with preempt disabled */ 720 cpu_startup_entry(CPUHP_ONLINE); 721 } 722 723 /* Check for early params. */ 724 static int __init do_early_param(char *param, char *val, 725 const char *unused, void *arg) 726 { 727 const struct obs_kernel_param *p; 728 729 for (p = __setup_start; p < __setup_end; p++) { 730 if ((p->early && parameq(param, p->str)) || 731 (strcmp(param, "console") == 0 && 732 strcmp(p->str, "earlycon") == 0) 733 ) { 734 if (p->setup_func(val) != 0) 735 pr_warn("Malformed early option '%s'\n", param); 736 } 737 } 738 /* We accept everything at this stage. */ 739 return 0; 740 } 741 742 void __init parse_early_options(char *cmdline) 743 { 744 parse_args("early options", cmdline, NULL, 0, 0, 0, NULL, 745 do_early_param); 746 } 747 748 /* Arch code calls this early on, or if not, just before other parsing. */ 749 void __init parse_early_param(void) 750 { 751 static int done __initdata; 752 static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata; 753 754 if (done) 755 return; 756 757 /* All fall through to do_early_param. */ 758 strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); 759 parse_early_options(tmp_cmdline); 760 done = 1; 761 } 762 763 void __init __weak arch_post_acpi_subsys_init(void) { } 764 765 void __init __weak smp_setup_processor_id(void) 766 { 767 } 768 769 # if THREAD_SIZE >= PAGE_SIZE 770 void __init __weak thread_stack_cache_init(void) 771 { 772 } 773 #endif 774 775 void __init __weak mem_encrypt_init(void) { } 776 777 void __init __weak poking_init(void) { } 778 779 void __init __weak pgtable_cache_init(void) { } 780 781 bool initcall_debug; 782 core_param(initcall_debug, initcall_debug, bool, 0644); 783 784 #ifdef TRACEPOINTS_ENABLED 785 static void __init initcall_debug_enable(void); 786 #else 787 static inline void initcall_debug_enable(void) 788 { 789 } 790 #endif 791 792 /* Report memory auto-initialization states for this boot. */ 793 static void __init report_meminit(void) 794 { 795 const char *stack; 796 797 if (IS_ENABLED(CONFIG_INIT_STACK_ALL_PATTERN)) 798 stack = "all(pattern)"; 799 else if (IS_ENABLED(CONFIG_INIT_STACK_ALL_ZERO)) 800 stack = "all(zero)"; 801 else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL)) 802 stack = "byref_all(zero)"; 803 else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF)) 804 stack = "byref(zero)"; 805 else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_USER)) 806 stack = "__user(zero)"; 807 else 808 stack = "off"; 809 810 pr_info("mem auto-init: stack:%s, heap alloc:%s, heap free:%s\n", 811 stack, want_init_on_alloc(GFP_KERNEL) ? "on" : "off", 812 want_init_on_free() ? "on" : "off"); 813 if (want_init_on_free()) 814 pr_info("mem auto-init: clearing system memory may take some time...\n"); 815 } 816 817 /* 818 * Set up kernel memory allocators 819 */ 820 static void __init mm_init(void) 821 { 822 /* 823 * page_ext requires contiguous pages, 824 * bigger than MAX_ORDER unless SPARSEMEM. 825 */ 826 page_ext_init_flatmem(); 827 init_mem_debugging_and_hardening(); 828 report_meminit(); 829 mem_init(); 830 /* page_owner must be initialized after buddy is ready */ 831 page_ext_init_flatmem_late(); 832 kmem_cache_init(); 833 kmemleak_init(); 834 pgtable_init(); 835 debug_objects_mem_init(); 836 vmalloc_init(); 837 ioremap_huge_init(); 838 /* Should be run before the first non-init thread is created */ 839 init_espfix_bsp(); 840 /* Should be run after espfix64 is set up. */ 841 pti_init(); 842 } 843 844 void __init __weak arch_call_rest_init(void) 845 { 846 rest_init(); 847 } 848 849 asmlinkage __visible void __init __no_sanitize_address start_kernel(void) 850 { 851 char *command_line; 852 char *after_dashes; 853 854 set_task_stack_end_magic(&init_task); 855 smp_setup_processor_id(); 856 debug_objects_early_init(); 857 858 cgroup_init_early(); 859 860 local_irq_disable(); 861 early_boot_irqs_disabled = true; 862 863 /* 864 * Interrupts are still disabled. Do necessary setups, then 865 * enable them. 866 */ 867 boot_cpu_init(); 868 page_address_init(); 869 pr_notice("%s", linux_banner); 870 early_security_init(); 871 setup_arch(&command_line); 872 setup_boot_config(command_line); 873 setup_command_line(command_line); 874 setup_nr_cpu_ids(); 875 setup_per_cpu_areas(); 876 smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ 877 boot_cpu_hotplug_init(); 878 879 build_all_zonelists(NULL); 880 page_alloc_init(); 881 882 pr_notice("Kernel command line: %s\n", saved_command_line); 883 /* parameters may set static keys */ 884 jump_label_init(); 885 parse_early_param(); 886 after_dashes = parse_args("Booting kernel", 887 static_command_line, __start___param, 888 __stop___param - __start___param, 889 -1, -1, NULL, &unknown_bootoption); 890 if (!IS_ERR_OR_NULL(after_dashes)) 891 parse_args("Setting init args", after_dashes, NULL, 0, -1, -1, 892 NULL, set_init_arg); 893 if (extra_init_args) 894 parse_args("Setting extra init args", extra_init_args, 895 NULL, 0, -1, -1, NULL, set_init_arg); 896 897 /* 898 * These use large bootmem allocations and must precede 899 * kmem_cache_init() 900 */ 901 setup_log_buf(0); 902 vfs_caches_init_early(); 903 sort_main_extable(); 904 trap_init(); 905 mm_init(); 906 907 ftrace_init(); 908 909 /* trace_printk can be enabled here */ 910 early_trace_init(); 911 912 /* 913 * Set up the scheduler prior starting any interrupts (such as the 914 * timer interrupt). Full topology setup happens at smp_init() 915 * time - but meanwhile we still have a functioning scheduler. 916 */ 917 sched_init(); 918 /* 919 * Disable preemption - early bootup scheduling is extremely 920 * fragile until we cpu_idle() for the first time. 921 */ 922 preempt_disable(); 923 if (WARN(!irqs_disabled(), 924 "Interrupts were enabled *very* early, fixing it\n")) 925 local_irq_disable(); 926 radix_tree_init(); 927 928 /* 929 * Set up housekeeping before setting up workqueues to allow the unbound 930 * workqueue to take non-housekeeping into account. 931 */ 932 housekeeping_init(); 933 934 /* 935 * Allow workqueue creation and work item queueing/cancelling 936 * early. Work item execution depends on kthreads and starts after 937 * workqueue_init(). 938 */ 939 workqueue_init_early(); 940 941 rcu_init(); 942 943 /* Trace events are available after this */ 944 trace_init(); 945 946 if (initcall_debug) 947 initcall_debug_enable(); 948 949 context_tracking_init(); 950 /* init some links before init_ISA_irqs() */ 951 early_irq_init(); 952 init_IRQ(); 953 tick_init(); 954 rcu_init_nohz(); 955 init_timers(); 956 hrtimers_init(); 957 softirq_init(); 958 timekeeping_init(); 959 960 /* 961 * For best initial stack canary entropy, prepare it after: 962 * - setup_arch() for any UEFI RNG entropy and boot cmdline access 963 * - timekeeping_init() for ktime entropy used in rand_initialize() 964 * - rand_initialize() to get any arch-specific entropy like RDRAND 965 * - add_latent_entropy() to get any latent entropy 966 * - adding command line entropy 967 */ 968 rand_initialize(); 969 add_latent_entropy(); 970 add_device_randomness(command_line, strlen(command_line)); 971 boot_init_stack_canary(); 972 973 time_init(); 974 perf_event_init(); 975 profile_init(); 976 call_function_init(); 977 WARN(!irqs_disabled(), "Interrupts were enabled early\n"); 978 979 early_boot_irqs_disabled = false; 980 local_irq_enable(); 981 982 kmem_cache_init_late(); 983 984 /* 985 * HACK ALERT! This is early. We're enabling the console before 986 * we've done PCI setups etc, and console_init() must be aware of 987 * this. But we do want output early, in case something goes wrong. 988 */ 989 console_init(); 990 if (panic_later) 991 panic("Too many boot %s vars at `%s'", panic_later, 992 panic_param); 993 994 lockdep_init(); 995 996 /* 997 * Need to run this when irqs are enabled, because it wants 998 * to self-test [hard/soft]-irqs on/off lock inversion bugs 999 * too: 1000 */ 1001 locking_selftest(); 1002 1003 /* 1004 * This needs to be called before any devices perform DMA 1005 * operations that might use the SWIOTLB bounce buffers. It will 1006 * mark the bounce buffers as decrypted so that their usage will 1007 * not cause "plain-text" data to be decrypted when accessed. 1008 */ 1009 mem_encrypt_init(); 1010 1011 #ifdef CONFIG_BLK_DEV_INITRD 1012 if (initrd_start && !initrd_below_start_ok && 1013 page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { 1014 pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n", 1015 page_to_pfn(virt_to_page((void *)initrd_start)), 1016 min_low_pfn); 1017 initrd_start = 0; 1018 } 1019 #endif 1020 setup_per_cpu_pageset(); 1021 numa_policy_init(); 1022 acpi_early_init(); 1023 if (late_time_init) 1024 late_time_init(); 1025 sched_clock_init(); 1026 calibrate_delay(); 1027 pid_idr_init(); 1028 anon_vma_init(); 1029 #ifdef CONFIG_X86 1030 if (efi_enabled(EFI_RUNTIME_SERVICES)) 1031 efi_enter_virtual_mode(); 1032 #endif 1033 thread_stack_cache_init(); 1034 cred_init(); 1035 fork_init(); 1036 proc_caches_init(); 1037 uts_ns_init(); 1038 key_init(); 1039 security_init(); 1040 dbg_late_init(); 1041 vfs_caches_init(); 1042 pagecache_init(); 1043 signals_init(); 1044 seq_file_init(); 1045 proc_root_init(); 1046 nsfs_init(); 1047 cpuset_init(); 1048 cgroup_init(); 1049 taskstats_init_early(); 1050 delayacct_init(); 1051 1052 poking_init(); 1053 check_bugs(); 1054 1055 acpi_subsystem_init(); 1056 arch_post_acpi_subsys_init(); 1057 sfi_init_late(); 1058 kcsan_init(); 1059 1060 /* Do the rest non-__init'ed, we're now alive */ 1061 arch_call_rest_init(); 1062 1063 prevent_tail_call_optimization(); 1064 } 1065 1066 /* Call all constructor functions linked into the kernel. */ 1067 static void __init do_ctors(void) 1068 { 1069 #ifdef CONFIG_CONSTRUCTORS 1070 ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; 1071 1072 for (; fn < (ctor_fn_t *) __ctors_end; fn++) 1073 (*fn)(); 1074 #endif 1075 } 1076 1077 #ifdef CONFIG_KALLSYMS 1078 struct blacklist_entry { 1079 struct list_head next; 1080 char *buf; 1081 }; 1082 1083 static __initdata_or_module LIST_HEAD(blacklisted_initcalls); 1084 1085 static int __init initcall_blacklist(char *str) 1086 { 1087 char *str_entry; 1088 struct blacklist_entry *entry; 1089 1090 /* str argument is a comma-separated list of functions */ 1091 do { 1092 str_entry = strsep(&str, ","); 1093 if (str_entry) { 1094 pr_debug("blacklisting initcall %s\n", str_entry); 1095 entry = memblock_alloc(sizeof(*entry), 1096 SMP_CACHE_BYTES); 1097 if (!entry) 1098 panic("%s: Failed to allocate %zu bytes\n", 1099 __func__, sizeof(*entry)); 1100 entry->buf = memblock_alloc(strlen(str_entry) + 1, 1101 SMP_CACHE_BYTES); 1102 if (!entry->buf) 1103 panic("%s: Failed to allocate %zu bytes\n", 1104 __func__, strlen(str_entry) + 1); 1105 strcpy(entry->buf, str_entry); 1106 list_add(&entry->next, &blacklisted_initcalls); 1107 } 1108 } while (str_entry); 1109 1110 return 0; 1111 } 1112 1113 static bool __init_or_module initcall_blacklisted(initcall_t fn) 1114 { 1115 struct blacklist_entry *entry; 1116 char fn_name[KSYM_SYMBOL_LEN]; 1117 unsigned long addr; 1118 1119 if (list_empty(&blacklisted_initcalls)) 1120 return false; 1121 1122 addr = (unsigned long) dereference_function_descriptor(fn); 1123 sprint_symbol_no_offset(fn_name, addr); 1124 1125 /* 1126 * fn will be "function_name [module_name]" where [module_name] is not 1127 * displayed for built-in init functions. Strip off the [module_name]. 1128 */ 1129 strreplace(fn_name, ' ', '\0'); 1130 1131 list_for_each_entry(entry, &blacklisted_initcalls, next) { 1132 if (!strcmp(fn_name, entry->buf)) { 1133 pr_debug("initcall %s blacklisted\n", fn_name); 1134 return true; 1135 } 1136 } 1137 1138 return false; 1139 } 1140 #else 1141 static int __init initcall_blacklist(char *str) 1142 { 1143 pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n"); 1144 return 0; 1145 } 1146 1147 static bool __init_or_module initcall_blacklisted(initcall_t fn) 1148 { 1149 return false; 1150 } 1151 #endif 1152 __setup("initcall_blacklist=", initcall_blacklist); 1153 1154 static __init_or_module void 1155 trace_initcall_start_cb(void *data, initcall_t fn) 1156 { 1157 ktime_t *calltime = (ktime_t *)data; 1158 1159 printk(KERN_DEBUG "calling %pS @ %i\n", fn, task_pid_nr(current)); 1160 *calltime = ktime_get(); 1161 } 1162 1163 static __init_or_module void 1164 trace_initcall_finish_cb(void *data, initcall_t fn, int ret) 1165 { 1166 ktime_t *calltime = (ktime_t *)data; 1167 ktime_t delta, rettime; 1168 unsigned long long duration; 1169 1170 rettime = ktime_get(); 1171 delta = ktime_sub(rettime, *calltime); 1172 duration = (unsigned long long) ktime_to_ns(delta) >> 10; 1173 printk(KERN_DEBUG "initcall %pS returned %d after %lld usecs\n", 1174 fn, ret, duration); 1175 } 1176 1177 static ktime_t initcall_calltime; 1178 1179 #ifdef TRACEPOINTS_ENABLED 1180 static void __init initcall_debug_enable(void) 1181 { 1182 int ret; 1183 1184 ret = register_trace_initcall_start(trace_initcall_start_cb, 1185 &initcall_calltime); 1186 ret |= register_trace_initcall_finish(trace_initcall_finish_cb, 1187 &initcall_calltime); 1188 WARN(ret, "Failed to register initcall tracepoints\n"); 1189 } 1190 # define do_trace_initcall_start trace_initcall_start 1191 # define do_trace_initcall_finish trace_initcall_finish 1192 #else 1193 static inline void do_trace_initcall_start(initcall_t fn) 1194 { 1195 if (!initcall_debug) 1196 return; 1197 trace_initcall_start_cb(&initcall_calltime, fn); 1198 } 1199 static inline void do_trace_initcall_finish(initcall_t fn, int ret) 1200 { 1201 if (!initcall_debug) 1202 return; 1203 trace_initcall_finish_cb(&initcall_calltime, fn, ret); 1204 } 1205 #endif /* !TRACEPOINTS_ENABLED */ 1206 1207 int __init_or_module do_one_initcall(initcall_t fn) 1208 { 1209 int count = preempt_count(); 1210 char msgbuf[64]; 1211 int ret; 1212 1213 if (initcall_blacklisted(fn)) 1214 return -EPERM; 1215 1216 do_trace_initcall_start(fn); 1217 ret = fn(); 1218 do_trace_initcall_finish(fn, ret); 1219 1220 msgbuf[0] = 0; 1221 1222 if (preempt_count() != count) { 1223 sprintf(msgbuf, "preemption imbalance "); 1224 preempt_count_set(count); 1225 } 1226 if (irqs_disabled()) { 1227 strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); 1228 local_irq_enable(); 1229 } 1230 WARN(msgbuf[0], "initcall %pS returned with %s\n", fn, msgbuf); 1231 1232 add_latent_entropy(); 1233 return ret; 1234 } 1235 1236 1237 extern initcall_entry_t __initcall_start[]; 1238 extern initcall_entry_t __initcall0_start[]; 1239 extern initcall_entry_t __initcall1_start[]; 1240 extern initcall_entry_t __initcall2_start[]; 1241 extern initcall_entry_t __initcall3_start[]; 1242 extern initcall_entry_t __initcall4_start[]; 1243 extern initcall_entry_t __initcall5_start[]; 1244 extern initcall_entry_t __initcall6_start[]; 1245 extern initcall_entry_t __initcall7_start[]; 1246 extern initcall_entry_t __initcall_end[]; 1247 1248 static initcall_entry_t *initcall_levels[] __initdata = { 1249 __initcall0_start, 1250 __initcall1_start, 1251 __initcall2_start, 1252 __initcall3_start, 1253 __initcall4_start, 1254 __initcall5_start, 1255 __initcall6_start, 1256 __initcall7_start, 1257 __initcall_end, 1258 }; 1259 1260 /* Keep these in sync with initcalls in include/linux/init.h */ 1261 static const char *initcall_level_names[] __initdata = { 1262 "pure", 1263 "core", 1264 "postcore", 1265 "arch", 1266 "subsys", 1267 "fs", 1268 "device", 1269 "late", 1270 }; 1271 1272 static int __init ignore_unknown_bootoption(char *param, char *val, 1273 const char *unused, void *arg) 1274 { 1275 return 0; 1276 } 1277 1278 static void __init do_initcall_level(int level, char *command_line) 1279 { 1280 initcall_entry_t *fn; 1281 1282 parse_args(initcall_level_names[level], 1283 command_line, __start___param, 1284 __stop___param - __start___param, 1285 level, level, 1286 NULL, ignore_unknown_bootoption); 1287 1288 trace_initcall_level(initcall_level_names[level]); 1289 for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++) 1290 do_one_initcall(initcall_from_entry(fn)); 1291 } 1292 1293 static void __init do_initcalls(void) 1294 { 1295 int level; 1296 size_t len = strlen(saved_command_line) + 1; 1297 char *command_line; 1298 1299 command_line = kzalloc(len, GFP_KERNEL); 1300 if (!command_line) 1301 panic("%s: Failed to allocate %zu bytes\n", __func__, len); 1302 1303 for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) { 1304 /* Parser modifies command_line, restore it each time */ 1305 strcpy(command_line, saved_command_line); 1306 do_initcall_level(level, command_line); 1307 } 1308 1309 kfree(command_line); 1310 } 1311 1312 /* 1313 * Ok, the machine is now initialized. None of the devices 1314 * have been touched yet, but the CPU subsystem is up and 1315 * running, and memory and process management works. 1316 * 1317 * Now we can finally start doing some real work.. 1318 */ 1319 static void __init do_basic_setup(void) 1320 { 1321 cpuset_init_smp(); 1322 driver_init(); 1323 init_irq_proc(); 1324 do_ctors(); 1325 usermodehelper_enable(); 1326 do_initcalls(); 1327 } 1328 1329 static void __init do_pre_smp_initcalls(void) 1330 { 1331 initcall_entry_t *fn; 1332 1333 trace_initcall_level("early"); 1334 for (fn = __initcall_start; fn < __initcall0_start; fn++) 1335 do_one_initcall(initcall_from_entry(fn)); 1336 } 1337 1338 static int run_init_process(const char *init_filename) 1339 { 1340 const char *const *p; 1341 1342 argv_init[0] = init_filename; 1343 pr_info("Run %s as init process\n", init_filename); 1344 pr_debug(" with arguments:\n"); 1345 for (p = argv_init; *p; p++) 1346 pr_debug(" %s\n", *p); 1347 pr_debug(" with environment:\n"); 1348 for (p = envp_init; *p; p++) 1349 pr_debug(" %s\n", *p); 1350 return kernel_execve(init_filename, argv_init, envp_init); 1351 } 1352 1353 static int try_to_run_init_process(const char *init_filename) 1354 { 1355 int ret; 1356 1357 ret = run_init_process(init_filename); 1358 1359 if (ret && ret != -ENOENT) { 1360 pr_err("Starting init: %s exists but couldn't execute it (error %d)\n", 1361 init_filename, ret); 1362 } 1363 1364 return ret; 1365 } 1366 1367 static noinline void __init kernel_init_freeable(void); 1368 1369 #if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX) 1370 bool rodata_enabled __ro_after_init = true; 1371 static int __init set_debug_rodata(char *str) 1372 { 1373 return strtobool(str, &rodata_enabled); 1374 } 1375 __setup("rodata=", set_debug_rodata); 1376 #endif 1377 1378 #ifdef CONFIG_STRICT_KERNEL_RWX 1379 static void mark_readonly(void) 1380 { 1381 if (rodata_enabled) { 1382 /* 1383 * load_module() results in W+X mappings, which are cleaned 1384 * up with call_rcu(). Let's make sure that queued work is 1385 * flushed so that we don't hit false positives looking for 1386 * insecure pages which are W+X. 1387 */ 1388 rcu_barrier(); 1389 mark_rodata_ro(); 1390 rodata_test(); 1391 } else 1392 pr_info("Kernel memory protection disabled.\n"); 1393 } 1394 #elif defined(CONFIG_ARCH_HAS_STRICT_KERNEL_RWX) 1395 static inline void mark_readonly(void) 1396 { 1397 pr_warn("Kernel memory protection not selected by kernel config.\n"); 1398 } 1399 #else 1400 static inline void mark_readonly(void) 1401 { 1402 pr_warn("This architecture does not have kernel memory protection.\n"); 1403 } 1404 #endif 1405 1406 void __weak free_initmem(void) 1407 { 1408 free_initmem_default(POISON_FREE_INITMEM); 1409 } 1410 1411 static int __ref kernel_init(void *unused) 1412 { 1413 int ret; 1414 1415 kernel_init_freeable(); 1416 /* need to finish all async __init code before freeing the memory */ 1417 async_synchronize_full(); 1418 kprobe_free_init_mem(); 1419 ftrace_free_init_mem(); 1420 free_initmem(); 1421 mark_readonly(); 1422 1423 /* 1424 * Kernel mappings are now finalized - update the userspace page-table 1425 * to finalize PTI. 1426 */ 1427 pti_finalize(); 1428 1429 system_state = SYSTEM_RUNNING; 1430 numa_default_policy(); 1431 1432 rcu_end_inkernel_boot(); 1433 1434 do_sysctl_args(); 1435 1436 if (ramdisk_execute_command) { 1437 ret = run_init_process(ramdisk_execute_command); 1438 if (!ret) 1439 return 0; 1440 pr_err("Failed to execute %s (error %d)\n", 1441 ramdisk_execute_command, ret); 1442 } 1443 1444 /* 1445 * We try each of these until one succeeds. 1446 * 1447 * The Bourne shell can be used instead of init if we are 1448 * trying to recover a really broken machine. 1449 */ 1450 if (execute_command) { 1451 ret = run_init_process(execute_command); 1452 if (!ret) 1453 return 0; 1454 panic("Requested init %s failed (error %d).", 1455 execute_command, ret); 1456 } 1457 1458 if (CONFIG_DEFAULT_INIT[0] != '\0') { 1459 ret = run_init_process(CONFIG_DEFAULT_INIT); 1460 if (ret) 1461 pr_err("Default init %s failed (error %d)\n", 1462 CONFIG_DEFAULT_INIT, ret); 1463 else 1464 return 0; 1465 } 1466 1467 if (!try_to_run_init_process("/sbin/init") || 1468 !try_to_run_init_process("/etc/init") || 1469 !try_to_run_init_process("/bin/init") || 1470 !try_to_run_init_process("/bin/sh")) 1471 return 0; 1472 1473 panic("No working init found. Try passing init= option to kernel. " 1474 "See Linux Documentation/admin-guide/init.rst for guidance."); 1475 } 1476 1477 /* Open /dev/console, for stdin/stdout/stderr, this should never fail */ 1478 void __init console_on_rootfs(void) 1479 { 1480 struct file *file = filp_open("/dev/console", O_RDWR, 0); 1481 1482 if (IS_ERR(file)) { 1483 pr_err("Warning: unable to open an initial console. Fallback to ttynull.\n"); 1484 register_ttynull_console(); 1485 1486 file = filp_open("/dev/console", O_RDWR, 0); 1487 if (IS_ERR(file)) { 1488 pr_err("Warning: Failed to add ttynull console. No stdin, stdout, and stderr for the init process!\n"); 1489 return; 1490 } 1491 } 1492 init_dup(file); 1493 init_dup(file); 1494 init_dup(file); 1495 fput(file); 1496 } 1497 1498 static noinline void __init kernel_init_freeable(void) 1499 { 1500 /* 1501 * Wait until kthreadd is all set-up. 1502 */ 1503 wait_for_completion(&kthreadd_done); 1504 1505 /* Now the scheduler is fully set up and can do blocking allocations */ 1506 gfp_allowed_mask = __GFP_BITS_MASK; 1507 1508 /* 1509 * init can allocate pages on any node 1510 */ 1511 set_mems_allowed(node_states[N_MEMORY]); 1512 1513 cad_pid = task_pid(current); 1514 1515 smp_prepare_cpus(setup_max_cpus); 1516 1517 workqueue_init(); 1518 1519 init_mm_internals(); 1520 1521 do_pre_smp_initcalls(); 1522 lockup_detector_init(); 1523 1524 smp_init(); 1525 sched_init_smp(); 1526 1527 padata_init(); 1528 page_alloc_init_late(); 1529 /* Initialize page ext after all struct pages are initialized. */ 1530 page_ext_init(); 1531 1532 do_basic_setup(); 1533 1534 kunit_run_all_tests(); 1535 1536 console_on_rootfs(); 1537 1538 /* 1539 * check if there is an early userspace init. If yes, let it do all 1540 * the work 1541 */ 1542 if (init_eaccess(ramdisk_execute_command) != 0) { 1543 ramdisk_execute_command = NULL; 1544 prepare_namespace(); 1545 } 1546 1547 /* 1548 * Ok, we have completed the initial bootup, and 1549 * we're essentially up and running. Get rid of the 1550 * initmem segments and start the user-mode stuff.. 1551 * 1552 * rootfs is available now, try loading the public keys 1553 * and default modules 1554 */ 1555 1556 integrity_load_keys(); 1557 } 1558