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setup_func) { 209 pr_warn("Parameter %s is obsolete, ignored\n", 210 p-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