// SPDX-License-Identifier: GPL-2.0-only

/*

* linux/init/main.c

*

* Copyright (C) 1991, 1992 Linus Torvalds

*

* GK 2/5/95 - Changed to support mounting root fs via NFS

* Added initrd & change_root: Werner Almesberger & Hans Lermen, Feb '96

* Moan early if gcc is old, avoiding bogus kernels - Paul Gortmaker, May '96

* Simplified starting of init: Michael A. Griffith <[email protected]>

*/

#define DEBUG /* Enable initcall_debug */

#include <linux/types.h>

#include <linux/export.h>

#include <linux/extable.h>

#include <linux/module.h>

#include <linux/proc_fs.h>

#include <linux/binfmts.h>

#include <linux/kernel.h>

#include <linux/syscalls.h>

#include <linux/stackprotector.h>

#include <linux/string.h>

#include <linux/ctype.h>

#include <linux/delay.h>

#include <linux/ioport.h>

#include <linux/init.h>

#include <linux/initrd.h>

#include <linux/memblock.h>

#include <linux/acpi.h>

#include <linux/bootconfig.h>

#include <linux/console.h>

#include <linux/nmi.h>

#include <linux/percpu.h>

#include <linux/kmod.h>

#include <linux/kprobes.h>

#include <linux/kmsan.h>

#include <linux/ksysfs.h>

#include <linux/vmalloc.h>

#include <linux/kernel_stat.h>

#include <linux/start_kernel.h>

#include <linux/security.h>

#include <linux/smp.h>

#include <linux/profile.h>

#include <linux/kfence.h>

#include <linux/rcupdate.h>

#include <linux/srcu.h>

#include <linux/moduleparam.h>

#include <linux/kallsyms.h>

#include <linux/buildid.h>

#include <linux/writeback.h>

#include <linux/cpu.h>

#include <linux/cpuset.h>

#include <linux/memcontrol.h>

#include <linux/cgroup.h>

#include <linux/tick.h>

#include <linux/sched/isolation.h>

#include <linux/interrupt.h>

#include <linux/taskstats_kern.h>

#include <linux/delayacct.h>

#include <linux/unistd.h>

#include <linux/utsname.h>

#include <linux/rmap.h>

#include <linux/mempolicy.h>

#include <linux/key.h>

#include <linux/debug_locks.h>

#include <linux/debugobjects.h>

#include <linux/lockdep.h>

#include <linux/kmemleak.h>

#include <linux/padata.h>

#include <linux/pid_namespace.h>

#include <linux/device/driver.h>

#include <linux/kthread.h>

#include <linux/sched.h>

#include <linux/sched/init.h>

#include <linux/signal.h>

#include <linux/idr.h>

#include <linux/kgdb.h>

#include <linux/ftrace.h>

#include <linux/async.h>

#include <linux/shmem_fs.h>

#include <linux/slab.h>

#include <linux/perf_event.h>

#include <linux/ptrace.h>

#include <linux/pti.h>

#include <linux/blkdev.h>

#include <linux/sched/clock.h>

#include <linux/sched/task.h>

#include <linux/sched/task_stack.h>

#include <linux/context_tracking.h>

#include <linux/random.h>

#include <linux/moduleloader.h>

#include <linux/list.h>

#include <linux/integrity.h>

#include <linux/proc_ns.h>

#include <linux/io.h>

#include <linux/cache.h>

#include <linux/rodata_test.h>

#include <linux/jump_label.h>

#include <linux/kcsan.h>

#include <linux/init_syscalls.h>

#include <linux/stackdepot.h>

#include <linux/randomize_kstack.h>

#include <linux/pidfs.h>

#include <linux/ptdump.h>

#include <linux/time_namespace.h>

#include <linux/unaligned.h>

#include <linux/vdso_datastore.h>

#include <net/net_namespace.h>

#include <asm/io.h>

#include <asm/setup.h>

#include <asm/sections.h>

#include <asm/cacheflush.h>

#define CREATE_TRACE_POINTS

#include <trace/events/initcall.h>

#include <kunit/test.h>

static int kernel_init(void *);

/*

* Debug helper: via this flag we know that we are in 'early bootup code'

* where only the boot processor is running with IRQ disabled. This means

* two things - IRQ must not be enabled before the flag is cleared and some

* operations which are not allowed with IRQ disabled are allowed while the

* flag is set.

*/

bool early_boot_irqs_disabled __read_mostly;

enum system_states system_state __read_mostly;

EXPORT_SYMBOL(system_state);

/*

* Boot command-line arguments

*/

#define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT

#define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT

/* Default late time init is NULL. archs can override this later. */

void (*__initdata late_time_init)(void);

/* Untouched command line saved by arch-specific code. */

char __initdata boot_command_line[COMMAND_LINE_SIZE];

/* Untouched saved command line (eg. for /proc) */

char *saved_command_line __ro_after_init;

unsigned int saved_command_line_len __ro_after_init;

/* Command line for parameter parsing */

static char *static_command_line;

/* Untouched extra command line */

static char *extra_command_line;

/* Extra init arguments */

static char *extra_init_args;

#ifdef CONFIG_BOOT_CONFIG

/* Is bootconfig on command line? */

static bool bootconfig_found;

static size_t initargs_offs;

#else

# define bootconfig_found false

# define initargs_offs 0

#endif

static char *execute_command;

static char *ramdisk_execute_command = "/init";

static bool __initdata ramdisk_execute_command_set;

/*

* Used to generate warnings if static_key manipulation functions are used

* before jump_label_init is called.

*/

bool static_key_initialized __read_mostly;

EXPORT_SYMBOL_GPL(static_key_initialized);

/*

* If set, this is an indication to the drivers that reset the underlying

* device before going ahead with the initialization otherwise driver might

* rely on the BIOS and skip the reset operation.

*

* This is useful if kernel is booting in an unreliable environment.

* For ex. kdump situation where previous kernel has crashed, BIOS has been

* skipped and devices will be in unknown state.

*/

unsigned int reset_devices;

EXPORT_SYMBOL(reset_devices);

static int __init set_reset_devices(char *str)

{

reset_devices = 1;

return 1;

}

__setup("reset_devices", set_reset_devices);

static const char *argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };

const char *envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };

static const char *panic_later, *panic_param;

static bool __init obsolete_checksetup(char *line)

{

const struct obs_kernel_param *p;

bool had_early_param = false;

p = __setup_start;

do {

int n = strlen(p->str);

if (parameqn(line, p->str, n)) {

if (p->early) {

/* Already done in parse_early_param?

* (Needs exact match on param part).

* Keep iterating, as we can have early

* params and __setups of same names 8( */

if (line[n] == '\0' || line[n] == '=')

had_early_param = true;

} else if (!p->setup_func) {

pr_warn("Parameter %s is obsolete, ignored\n",

p->str);

return true;

} else if (p->setup_func(line + n))

return true;

}

p++;

} while (p < __setup_end);

return had_early_param;

}

/*

* This should be approx 2 Bo*oMips to start (note initial shift), and will

* still work even if initially too large, it will just take slightly longer

*/

unsigned long loops_per_jiffy = (1<<12);

EXPORT_SYMBOL(loops_per_jiffy);

static int __init debug_kernel(char *str)

{

console_loglevel = CONSOLE_LOGLEVEL_DEBUG;

return 0;

}

static int __init quiet_kernel(char *str)

{

console_loglevel = CONSOLE_LOGLEVEL_QUIET;

return 0;

}

early_param("debug", debug_kernel);

early_param("quiet", quiet_kernel);

static int __init loglevel(char *str)

{

int newlevel;

/*

* Only update loglevel value when a correct setting was passed,

* to prevent blind crashes (when loglevel being set to 0) that

* are quite hard to debug

*/

if (get_option(&str, &newlevel)) {

console_loglevel = newlevel;

return 0;

}

return -EINVAL;

}

early_param("loglevel", loglevel);

#ifdef CONFIG_BLK_DEV_INITRD

static void * __init get_boot_config_from_initrd(size_t *_size)

{

u32 size, csum;

char *data;

u8 *hdr;

int i;

if (!initrd_end)

return NULL;

data = (char *)initrd_end - BOOTCONFIG_MAGIC_LEN;

/*

* Since Grub may align the size of initrd to 4, we must

* check the preceding 3 bytes as well.

*/

for (i = 0; i < 4; i++) {

if (!memcmp(data, BOOTCONFIG_MAGIC, BOOTCONFIG_MAGIC_LEN))

goto found;

data--;

}

return NULL;

found:

hdr = (u8 *)(data - 8);

size = get_unaligned_le32(hdr);

csum = get_unaligned_le32(hdr + 4);

data = ((void *)hdr) - size;

if ((unsigned long)data < initrd_start) {

pr_err("bootconfig size %d is greater than initrd size %ld\n",

size, initrd_end - initrd_start);

return NULL;

}

if (xbc_calc_checksum(data, size) != csum) {

pr_err("bootconfig checksum failed\n");

return NULL;

}

/* Remove bootconfig from initramfs/initrd */

initrd_end = (unsigned long)data;

if (_size)

*_size = size;

return data;

}

#else

static void * __init get_boot_config_from_initrd(size_t *_size)

{

return NULL;

}

#endif

#ifdef CONFIG_BOOT_CONFIG

static char xbc_namebuf[XBC_KEYLEN_MAX] __initdata;

#define rest(dst, end) ((end) > (dst) ? (end) - (dst) : 0)

static int __init xbc_snprint_cmdline(char *buf, size_t size,

struct xbc_node *root)

{

struct xbc_node *knode, *vnode;

char *end = buf + size;

const char *val, *q;

int ret;

xbc_node_for_each_key_value(root, knode, val) {

ret = xbc_node_compose_key_after(root, knode,

xbc_namebuf, XBC_KEYLEN_MAX);

if (ret < 0)

return ret;

vnode = xbc_node_get_child(knode);

if (!vnode) {

ret = snprintf(buf, rest(buf, end), "%s ", xbc_namebuf);

if (ret < 0)

return ret;

buf += ret;

continue;

}

xbc_array_for_each_value(vnode, val) {

/*

* For prettier and more readable /proc/cmdline, only

* quote the value when necessary, i.e. when it contains

* whitespace.

*/

q = strpbrk(val, " \t\r\n") ? "\"" : "";

ret = snprintf(buf, rest(buf, end), "%s=%s%s%s ",

xbc_namebuf, q, val, q);

if (ret < 0)

return ret;

buf += ret;

}

}

return buf - (end - size);

}

#undef rest

/* Make an extra command line under given key word */

static char * __init xbc_make_cmdline(const char *key)

{

struct xbc_node *root;

char *new_cmdline;

int ret, len = 0;

root = xbc_find_node(key);

if (!root)

return NULL;

/* Count required buffer size */

len = xbc_snprint_cmdline(NULL, 0, root);

if (len <= 0)

return NULL;

new_cmdline = memblock_alloc(len + 1, SMP_CACHE_BYTES);

if (!new_cmdline) {

pr_err("Failed to allocate memory for extra kernel cmdline.\n");

return NULL;

}

ret = xbc_snprint_cmdline(new_cmdline, len + 1, root);

if (ret < 0 || ret > len) {

pr_err("Failed to print extra kernel cmdline.\n");

memblock_free(new_cmdline, len + 1);

return NULL;

}

return new_cmdline;

}

static int __init bootconfig_params(char *param, char *val,

const char *unused, void *arg)

{

if (strcmp(param, "bootconfig") == 0) {

bootconfig_found = true;

}

return 0;

}

static int __init warn_bootconfig(char *str)

{

/* The 'bootconfig' has been handled by bootconfig_params(). */

return 0;

}

static void __init setup_boot_config(void)

{

static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata;

const char *msg, *data;

int pos, ret;

size_t size;

char *err;

/* Cut out the bootconfig data even if we have no bootconfig option */

data = get_boot_config_from_initrd(&size);

/* If there is no bootconfig in initrd, try embedded one. */

if (!data)

data = xbc_get_embedded_bootconfig(&size);

strscpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);

err = parse_args("bootconfig", tmp_cmdline, NULL, 0, 0, 0, NULL,

bootconfig_params);

if (IS_ERR(err) || !(bootconfig_found || IS_ENABLED(CONFIG_BOOT_CONFIG_FORCE)))

return;

/* parse_args() stops at the next param of '--' and returns an address */

if (err)

initargs_offs = err - tmp_cmdline;

if (!data) {

/* If user intended to use bootconfig, show an error level message */

if (bootconfig_found)

pr_err("'bootconfig' found on command line, but no bootconfig found\n");

else

pr_info("No bootconfig data provided, so skipping bootconfig");

return;

}

if (size >= XBC_DATA_MAX) {

pr_err("bootconfig size %ld greater than max size %d\n",

(long)size, XBC_DATA_MAX);

return;

}

ret = xbc_init(data, size, &msg, &pos);

if (ret < 0) {

if (pos < 0)

pr_err("Failed to init bootconfig: %s.\n", msg);

else

pr_err("Failed to parse bootconfig: %s at %d.\n",

msg, pos);

} else {

xbc_get_info(&ret, NULL);

pr_info("Load bootconfig: %ld bytes %d nodes\n", (long)size, ret);

/* keys starting with "kernel." are passed via cmdline */

extra_command_line = xbc_make_cmdline("kernel");

/* Also, "init." keys are init arguments */

extra_init_args = xbc_make_cmdline("init");

}

return;

}

static void __init exit_boot_config(void)

{

xbc_exit();

}

#else /* !CONFIG_BOOT_CONFIG */

static void __init setup_boot_config(void)

{

/* Remove bootconfig data from initrd */

get_boot_config_from_initrd(NULL);

}

static int __init warn_bootconfig(char *str)

{

pr_warn("WARNING: 'bootconfig' found on the kernel command line but CONFIG_BOOT_CONFIG is not set.\n");

return 0;

}

#define exit_boot_config() do {} while (0)

#endif /* CONFIG_BOOT_CONFIG */

early_param("bootconfig", warn_bootconfig);

bool __init cmdline_has_extra_options(void)

{

return extra_command_line || extra_init_args;

}

/* Change NUL term back to "=", to make "param" the whole string. */

static void __init repair_env_string(char *param, char *val)

{

if (val) {

/* param=val or param="val"? */

if (val == param+strlen(param)+1)

val[-1] = '=';

else if (val == param+strlen(param)+2) {

val[-2] = '=';

memmove(val-1, val, strlen(val)+1);

} else

BUG();

}

}

/* Anything after -- gets handed straight to init. */

static int __init set_init_arg(char *param, char *val,

const char *unused, void *arg)

{

unsigned int i;

if (panic_later)

return 0;

repair_env_string(param, val);

for (i = 0; argv_init[i]; i++) {

if (i == MAX_INIT_ARGS) {

panic_later = "init";

panic_param = param;

return 0;

}

}

argv_init[i] = param;

return 0;

}

/*

* Unknown boot options get handed to init, unless they look like

* unused parameters (modprobe will find them in /proc/cmdline).

*/

static int __init unknown_bootoption(char *param, char *val,

const char *unused, void *arg)

{

size_t len = strlen(param);

/*

* Well-known bootloader identifiers:

* 1. LILO/Grub pass "BOOT_IMAGE=...";

* 2. kexec/kdump (kexec-tools) pass "kexec".

*/

const char *bootloader[] = { "BOOT_IMAGE=", "kexec", NULL };

/* Handle params aliased to sysctls */

if (sysctl_is_alias(param))

return 0;

repair_env_string(param, val);

/* Handle bootloader identifier */

for (int i = 0; bootloader[i]; i++) {

if (strstarts(param, bootloader[i]))

return 0;

}

/* Handle obsolete-style parameters */

if (obsolete_checksetup(param))

return 0;

/* Unused module parameter. */

if (strnchr(param, len, '.'))

return 0;

if (panic_later)

return 0;

if (val) {

/* Environment option */

unsigned int i;

for (i = 0; envp_init[i]; i++) {

if (i == MAX_INIT_ENVS) {

panic_later = "env";

panic_param = param;

}

if (!strncmp(param, envp_init[i], len+1))

break;

}

envp_init[i] = param;

} else {

/* Command line option */

unsigned int i;

for (i = 0; argv_init[i]; i++) {

if (i == MAX_INIT_ARGS) {

panic_later = "init";

panic_param = param;

}

}

argv_init[i] = param;

}

return 0;

}

static int __init init_setup(char *str)

{

unsigned int i;

execute_command = str;

/*

* In case LILO is going to boot us with default command line,

* it prepends "auto" before the whole cmdline which makes

* the shell think it should execute a script with such name.

* So we ignore all arguments entered _before_ init=... [MJ]

*/

for (i = 1; i < MAX_INIT_ARGS; i++)

argv_init[i] = NULL;

return 1;

}

__setup("init=", init_setup);

static int __init rdinit_setup(char *str)

{

unsigned int i;

ramdisk_execute_command = str;

ramdisk_execute_command_set = true;

/* See "auto" comment in init_setup */

for (i = 1; i < MAX_INIT_ARGS; i++)

argv_init[i] = NULL;

return 1;

}

__setup("rdinit=", rdinit_setup);

#ifndef CONFIG_SMP

static inline void setup_nr_cpu_ids(void) { }

static inline void smp_prepare_cpus(unsigned int maxcpus) { }

#endif

/*

* We need to store the untouched command line for future reference.

* We also need to store the touched command line since the parameter

* parsing is performed in place, and we should allow a component to

* store reference of name/value for future reference.

*/

static void __init setup_command_line(char *command_line)

{

size_t len, xlen = 0, ilen = 0;

if (extra_command_line)

xlen = strlen(extra_command_line);

if (extra_init_args) {

extra_init_args = strim(extra_init_args); /* remove trailing space */

ilen = strlen(extra_init_args) + 4; /* for " -- " */

}

len = xlen + strlen(boot_command_line) + ilen + 1;

saved_command_line = memblock_alloc_or_panic(len, SMP_CACHE_BYTES);

len = xlen + strlen(command_line) + 1;

static_command_line = memblock_alloc_or_panic(len, SMP_CACHE_BYTES);

if (xlen) {

/*

* We have to put extra_command_line before boot command

* lines because there could be dashes (separator of init

* command line) in the command lines.

*/

strcpy(saved_command_line, extra_command_line);

strcpy(static_command_line, extra_command_line);

}

strcpy(saved_command_line + xlen, boot_command_line);

strcpy(static_command_line + xlen, command_line);

if (ilen) {

/*

* Append supplemental init boot args to saved_command_line

* so that user can check what command line options passed

* to init.

* The order should always be

* " -- "[bootconfig init-param][cmdline init-param]

*/

if (initargs_offs) {

len = xlen + initargs_offs;

strcpy(saved_command_line + len, extra_init_args);

len += ilen - 4; /* strlen(extra_init_args) */

strcpy(saved_command_line + len,

boot_command_line + initargs_offs - 1);

} else {

len = strlen(saved_command_line);

strcpy(saved_command_line + len, " -- ");

len += 4;

strcpy(saved_command_line + len, extra_init_args);

}

}

saved_command_line_len = strlen(saved_command_line);

}

/*

* We need to finalize in a non-__init function or else race conditions

* between the root thread and the init thread may cause start_kernel to

* be reaped by free_initmem before the root thread has proceeded to

* cpu_idle.

*

* gcc-3.4 accidentally inlines this function, so use noinline.

*/

static __initdata DECLARE_COMPLETION(kthreadd_done);

static noinline void __ref __noreturn rest_init(void)

{

struct task_struct *tsk;

int pid;

rcu_scheduler_starting();

/*

* We need to spawn init first so that it obtains pid 1, however

* the init task will end up wanting to create kthreads, which, if

* we schedule it before we create kthreadd, will OOPS.

*/

pid = user_mode_thread(kernel_init, NULL, CLONE_FS);

/*

* Pin init on the boot CPU. Task migration is not properly working

* until sched_init_smp() has been run. It will set the allowed

* CPUs for init to the non isolated CPUs.

*/

rcu_read_lock();

tsk = find_task_by_pid_ns(pid, &init_pid_ns);

tsk->flags |= PF_NO_SETAFFINITY;

set_cpus_allowed_ptr(tsk, cpumask_of(smp_processor_id()));

rcu_read_unlock();

numa_default_policy();

pid = kernel_thread(kthreadd, NULL, NULL, CLONE_FS | CLONE_FILES);

rcu_read_lock();

kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns);

rcu_read_unlock();

/*

* Enable might_sleep() and smp_processor_id() checks.

* They cannot be enabled earlier because with CONFIG_PREEMPTION=y

* kernel_thread() would trigger might_sleep() splats. With

* CONFIG_PREEMPT_VOLUNTARY=y the init task might have scheduled

* already, but it's stuck on the kthreadd_done completion.

*/

system_state = SYSTEM_SCHEDULING;

complete(&kthreadd_done);

/*

* The boot idle thread must execute schedule()

* at least once to get things moving:

*/

schedule_preempt_disabled();

/* Call into cpu_idle with preempt disabled */

cpu_startup_entry(CPUHP_ONLINE);

}

/* Check for early params. */

static int __init do_early_param(char *param, char *val,

const char *unused, void *arg)

{

const struct obs_kernel_param *p;

for (p = __setup_start; p < __setup_end; p++) {

if (p->early && parameq(param, p->str)) {

if (p->setup_func(val) != 0)

pr_warn("Malformed early option '%s'\n", param);

}

}

/* We accept everything at this stage. */

return 0;

}

void __init parse_early_options(char *cmdline)

{

parse_args("early options", cmdline, NULL, 0, 0, 0, NULL,

do_early_param);

}

/* Arch code calls this early on, or if not, just before other parsing. */

void __init parse_early_param(void)

{

static int done __initdata;

static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata;

if (done)

return;

/* All fall through to do_early_param. */

strscpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);

parse_early_options(tmp_cmdline);

done = 1;

}

void __init __weak arch_post_acpi_subsys_init(void) { }

void __init __weak smp_setup_processor_id(void)

{

}

void __init __weak smp_prepare_boot_cpu(void)

{

}

# if THREAD_SIZE >= PAGE_SIZE

void __init __weak thread_stack_cache_init(void)

{

}

#endif

void __init __weak poking_init(void) { }

void __init __weak pgtable_cache_init(void) { }

void __init __weak trap_init(void) { }

bool initcall_debug;

core_param(initcall_debug, initcall_debug, bool, 0644);

#ifdef TRACEPOINTS_ENABLED

static void __init initcall_debug_enable(void);

#else

static inline void initcall_debug_enable(void)

{

}

#endif

#ifdef CONFIG_RANDOMIZE_KSTACK_OFFSET

DEFINE_STATIC_KEY_MAYBE_RO(CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT,

randomize_kstack_offset);

DEFINE_PER_CPU(struct rnd_state, kstack_rnd_state);

static int __init random_kstack_init(void)

{

prandom_seed_full_state(&kstack_rnd_state);

return 0;

}

late_initcall(random_kstack_init);

static int __init early_randomize_kstack_offset(char *buf)

{

int ret;

bool bool_result;

ret = kstrtobool(buf, &bool_result);

if (ret)

return ret;

if (bool_result)

static_branch_enable(&randomize_kstack_offset);

else

static_branch_disable(&randomize_kstack_offset);

return 0;

}

early_param("randomize_kstack_offset", early_randomize_kstack_offset);

#endif

static void __init print_unknown_bootoptions(void)

{

char *unknown_options;

char *end;

const char *const *p;

size_t len;

if (panic_later || (!argv_init[1] && !envp_init[2]))

return;

/*

* Determine how many options we have to print out, plus a space

* before each

*/

len = 1; /* null terminator */

for (p = &argv_init[1]; *p; p++) {

len++;

len += strlen(*p);

}

for (p = &envp_init[2]; *p; p++) {

len++;

len += strlen(*p);

}

unknown_options = memblock_alloc(len, SMP_CACHE_BYTES);

if (!unknown_options) {

pr_err("%s: Failed to allocate %zu bytes\n",

__func__, len);

return;

}

end = unknown_options;

for (p = &argv_init[1]; *p; p++)

end += sprintf(end, " %s", *p);

for (p = &envp_init[2]; *p; p++)

end += sprintf(end, " %s", *p);

/* Start at unknown_options[1] to skip the initial space */

pr_notice("Unknown kernel command line parameters \"%s\", will be passed to user space.\n",

&unknown_options[1]);

memblock_free(unknown_options, len);

}

static void __init early_numa_node_init(void)

{

#ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID

#ifndef cpu_to_node

int cpu;

/* The early_cpu_to_node() should be ready here. */

for_each_possible_cpu(cpu)

set_cpu_numa_node(cpu, early_cpu_to_node(cpu));

#endif

#endif

}

#define KERNEL_CMDLINE_PREFIX "Kernel command line: "

#define KERNEL_CMDLINE_PREFIX_LEN (sizeof(KERNEL_CMDLINE_PREFIX) - 1)

#define KERNEL_CMDLINE_CONTINUATION " \\"

#define KERNEL_CMDLINE_CONTINUATION_LEN (sizeof(KERNEL_CMDLINE_CONTINUATION) - 1)

#define MIN_CMDLINE_LOG_WRAP_IDEAL_LEN (KERNEL_CMDLINE_PREFIX_LEN + \

KERNEL_CMDLINE_CONTINUATION_LEN)

#define CMDLINE_LOG_WRAP_IDEAL_LEN (CONFIG_CMDLINE_LOG_WRAP_IDEAL_LEN > \

MIN_CMDLINE_LOG_WRAP_IDEAL_LEN ? \

CONFIG_CMDLINE_LOG_WRAP_IDEAL_LEN : \

MIN_CMDLINE_LOG_WRAP_IDEAL_LEN)

#define IDEAL_CMDLINE_LEN (CMDLINE_LOG_WRAP_IDEAL_LEN - KERNEL_CMDLINE_PREFIX_LEN)

#define IDEAL_CMDLINE_SPLIT_LEN (IDEAL_CMDLINE_LEN - KERNEL_CMDLINE_CONTINUATION_LEN)

/**

* print_kernel_cmdline() - Print the kernel cmdline with wrapping.

* @cmdline: The cmdline to print.

*

* Print the kernel command line, trying to wrap based on the Kconfig knob

* CONFIG_CMDLINE_LOG_WRAP_IDEAL_LEN.

*

* Wrapping is based on spaces, ignoring quotes. All lines are prefixed

* with "Kernel command line: " and lines that are not the last line have

* a " \" suffix added to them. The prefix and suffix count towards the

* line length for wrapping purposes. The ideal length will be exceeded

* if no appropriate place to wrap is found.

*

* Example output if CONFIG_CMDLINE_LOG_WRAP_IDEAL_LEN is 40:

* Kernel command line: loglevel=7 \

* Kernel command line: init=/sbin/init \

* Kernel command line: root=PARTUUID=8c3efc1a-768b-6642-8d0c-89eb782f19f0/PARTNROFF=1 \

* Kernel command line: rootwait ro \

* Kernel command line: my_quoted_arg="The \

* Kernel command line: quick brown fox \

* Kernel command line: jumps over the \

* Kernel command line: lazy dog."

*/

static void __init print_kernel_cmdline(const char *cmdline)

{

size_t len;

/* Config option of 0 or anything longer than the max disables wrapping */

if (CONFIG_CMDLINE_LOG_WRAP_IDEAL_LEN == 0 ||

IDEAL_CMDLINE_LEN >= COMMAND_LINE_SIZE - 1) {

pr_notice("%s%s\n", KERNEL_CMDLINE_PREFIX, cmdline);

return;

}

len = strlen(cmdline);

while (len > IDEAL_CMDLINE_LEN) {

const char *first_space;

const char *prev_cutoff;

const char *cutoff;

int to_print;

size_t used;

/* Find the last ' ' that wouldn't make the line too long */

prev_cutoff = NULL;

cutoff = cmdline;

while (true) {

cutoff = strchr(cutoff + 1, ' ');

if (!cutoff || cutoff - cmdline > IDEAL_CMDLINE_SPLIT_LEN)

break;

prev_cutoff = cutoff;

}

if (prev_cutoff)

cutoff = prev_cutoff;

else if (!cutoff)

break;

/* Find the beginning and end of the string of spaces */

first_space = cutoff;

while (first_space > cmdline && first_space[-1] == ' ')

first_space--;

to_print = first_space - cmdline;

while (*cutoff == ' ')

cutoff++;

used = cutoff - cmdline;