[Feature][T106_eSDK]T106-V2.01.01.02P56U06.AP.15.11_CAP.15.11(SDK4.6)diff_17.02(SDK4.7)
Only Configure: No
Affected branch: master
Affected module: unknow
Is it affected on both ZXIC and MTK: only ZXIC
Self-test: Yes
Doc Update: No
Change-Id: I9dc02273b59a074828ab3eeaa84306415b153138
diff --git a/upstream/linux-5.10/init/main.c b/upstream/linux-5.10/init/main.c
new file mode 100755
index 0000000..83d93ea
--- /dev/null
+++ b/upstream/linux-5.10/init/main.c
@@ -0,0 +1,1571 @@
+// 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 <grif@acm.org>
+ */
+
+#define DEBUG /* Enable initcall_debug */
+
+#include <linux/types.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/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/rcupdate.h>
+#include <linux/moduleparam.h>
+#include <linux/kallsyms.h>
+#include <linux/writeback.h>
+#include <linux/cpu.h>
+#include <linux/cpuset.h>
+#include <linux/cgroup.h>
+#include <linux/efi.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/buffer_head.h>
+#include <linux/page_ext.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/sfi.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/elevator.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/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/mem_encrypt.h>
+#include <linux/kcsan.h>
+#include <linux/init_syscalls.h>
+
+#include <asm/io.h>
+#include <asm/bugs.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>
+
+#ifdef CONFIG_FLAGS_UTILS
+#include <linux/reboot.h>
+#include "pub_flags.h"
+#endif
+
+static int kernel_init(void *);
+
+extern void init_IRQ(void);
+extern void radix_tree_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
+
+extern void time_init(void);
+/* 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;
+/* 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 bool initargs_found;
+#else
+# define bootconfig_found false
+# define initargs_found false
+#endif
+
+static char *execute_command;
+static char *ramdisk_execute_command = "/init";
+
+/*
+ * 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;
+
+extern const struct obs_kernel_param __setup_start[], __setup_end[];
+
+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(u32 *_size, u32 *_csum)
+{
+ u32 size, csum;
+ char *data;
+ u32 *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 = (u32 *)(data - 8);
+ size = le32_to_cpu(hdr[0]);
+ csum = le32_to_cpu(hdr[1]);
+
+ 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;
+ }
+
+ /* Remove bootconfig from initramfs/initrd */
+ initrd_end = (unsigned long)data;
+ if (_size)
+ *_size = size;
+ if (_csum)
+ *_csum = csum;
+
+ return data;
+}
+#else
+static void * __init get_boot_config_from_initrd(u32 *_size, u32 *_csum)
+{
+ 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;
+ 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) {
+ ret = snprintf(buf, rest(buf, end), "%s=\"%s\" ",
+ xbc_namebuf, val);
+ 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(__pa(new_cmdline), len + 1);
+ return NULL;
+ }
+
+ return new_cmdline;
+}
+
+static u32 boot_config_checksum(unsigned char *p, u32 size)
+{
+ u32 ret = 0;
+
+ while (size--)
+ ret += *p++;
+
+ return ret;
+}
+
+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 void __init setup_boot_config(const char *cmdline)
+{
+ static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata;
+ const char *msg;
+ int pos;
+ u32 size, csum;
+ char *data, *copy, *err;
+ int ret;
+
+ /* Cut out the bootconfig data even if we have no bootconfig option */
+ data = get_boot_config_from_initrd(&size, &csum);
+
+ strlcpy(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)
+ return;
+
+ /* parse_args() stops at '--' and returns an address */
+ if (err)
+ initargs_found = true;
+
+ if (!data) {
+ pr_err("'bootconfig' found on command line, but no bootconfig found\n");
+ return;
+ }
+
+ if (size >= XBC_DATA_MAX) {
+ pr_err("bootconfig size %d greater than max size %d\n",
+ size, XBC_DATA_MAX);
+ return;
+ }
+
+ if (boot_config_checksum((unsigned char *)data, size) != csum) {
+ pr_err("bootconfig checksum failed\n");
+ return;
+ }
+
+ copy = memblock_alloc(size + 1, SMP_CACHE_BYTES);
+ if (!copy) {
+ pr_err("Failed to allocate memory for bootconfig\n");
+ return;
+ }
+
+ memcpy(copy, data, size);
+ copy[size] = '\0';
+
+ ret = xbc_init(copy, &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 {
+ pr_info("Load bootconfig: %d bytes %d nodes\n", 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;
+}
+
+#else
+
+static void __init setup_boot_config(const char *cmdline)
+{
+ /* Remove bootconfig data from initrd */
+ get_boot_config_from_initrd(NULL, 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;
+}
+early_param("bootconfig", warn_bootconfig);
+
+#endif
+
+/* 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);
+
+ repair_env_string(param, val);
+
+ /* 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;
+ /* 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 const unsigned int setup_max_cpus = NR_CPUS;
+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)
+ ilen = strlen(extra_init_args) + 4; /* for " -- " */
+
+ len = xlen + strlen(boot_command_line) + 1;
+
+ saved_command_line = memblock_alloc(len + ilen, SMP_CACHE_BYTES);
+ if (!saved_command_line)
+ panic("%s: Failed to allocate %zu bytes\n", __func__, len + ilen);
+
+ static_command_line = memblock_alloc(len, SMP_CACHE_BYTES);
+ if (!static_command_line)
+ panic("%s: Failed to allocate %zu bytes\n", __func__, len);
+
+ 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.
+ */
+ len = strlen(saved_command_line);
+ if (initargs_found) {
+ saved_command_line[len++] = ' ';
+ } else {
+ strcpy(saved_command_line + len, " -- ");
+ len += 4;
+ }
+
+ strcpy(saved_command_line + len, extra_init_args);
+ }
+}
+
+/*
+ * 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);
+
+noinline void __ref 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 = kernel_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);
+ set_cpus_allowed_ptr(tsk, cpumask_of(smp_processor_id()));
+ rcu_read_unlock();
+
+ numa_default_policy();
+ pid = kernel_thread(kthreadd, 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)) ||
+ (strcmp(param, "console") == 0 &&
+ strcmp(p->str, "earlycon") == 0)
+ ) {
+ 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. */
+ strlcpy(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)
+{
+}
+
+# if THREAD_SIZE >= PAGE_SIZE
+void __init __weak thread_stack_cache_init(void)
+{
+}
+#endif
+
+void __init __weak mem_encrypt_init(void) { }
+
+void __init __weak poking_init(void) { }
+
+void __init __weak pgtable_cache_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
+
+/* Report memory auto-initialization states for this boot. */
+static void __init report_meminit(void)
+{
+ const char *stack;
+
+ if (IS_ENABLED(CONFIG_INIT_STACK_ALL_PATTERN))
+ stack = "all(pattern)";
+ else if (IS_ENABLED(CONFIG_INIT_STACK_ALL_ZERO))
+ stack = "all(zero)";
+ else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL))
+ stack = "byref_all(zero)";
+ else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF))
+ stack = "byref(zero)";
+ else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_USER))
+ stack = "__user(zero)";
+ else
+ stack = "off";
+
+ pr_info("mem auto-init: stack:%s, heap alloc:%s, heap free:%s\n",
+ stack, want_init_on_alloc(GFP_KERNEL) ? "on" : "off",
+ want_init_on_free() ? "on" : "off");
+ if (want_init_on_free())
+ pr_info("mem auto-init: clearing system memory may take some time...\n");
+}
+
+/*
+ * Set up kernel memory allocators
+ */
+static void __init mm_init(void)
+{
+ /*
+ * page_ext requires contiguous pages,
+ * bigger than MAX_ORDER unless SPARSEMEM.
+ */
+ page_ext_init_flatmem();
+ init_debug_pagealloc();
+ report_meminit();
+ mem_init();
+ kmem_cache_init();
+ kmemleak_init();
+ pgtable_init();
+ debug_objects_mem_init();
+ vmalloc_init();
+ ioremap_huge_init();
+ /* Should be run before the first non-init thread is created */
+ init_espfix_bsp();
+ /* Should be run after espfix64 is set up. */
+ pti_init();
+}
+
+void __init __weak arch_call_rest_init(void)
+{
+ rest_init();
+}
+
+void __weak early_drv_init(void) {}
+
+asmlinkage __visible void __init __no_sanitize_address start_kernel(void)
+{
+ char *command_line;
+ char *after_dashes;
+
+ set_task_stack_end_magic(&init_task);
+ smp_setup_processor_id();
+ debug_objects_early_init();
+
+ cgroup_init_early();
+
+ local_irq_disable();
+ early_boot_irqs_disabled = true;
+
+ /*
+ * Interrupts are still disabled. Do necessary setups, then
+ * enable them.
+ */
+ boot_cpu_init();
+ page_address_init();
+ pr_notice("%s", linux_banner);
+ early_security_init();
+ setup_arch(&command_line);
+ setup_boot_config(command_line);
+ setup_command_line(command_line);
+ setup_nr_cpu_ids();
+ setup_per_cpu_areas();
+ smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */
+ boot_cpu_hotplug_init();
+
+ build_all_zonelists(NULL);
+ page_alloc_init();
+
+ pr_notice("Kernel command line: %s\n", saved_command_line);
+ /* parameters may set static keys */
+ jump_label_init();
+ parse_early_param();
+ after_dashes = parse_args("Booting kernel",
+ static_command_line, __start___param,
+ __stop___param - __start___param,
+ -1, -1, NULL, &unknown_bootoption);
+ if (!IS_ERR_OR_NULL(after_dashes))
+ parse_args("Setting init args", after_dashes, NULL, 0, -1, -1,
+ NULL, set_init_arg);
+ if (extra_init_args)
+ parse_args("Setting extra init args", extra_init_args,
+ NULL, 0, -1, -1, NULL, set_init_arg);
+
+ /*
+ * These use large bootmem allocations and must precede
+ * kmem_cache_init()
+ */
+ setup_log_buf(0);
+ vfs_caches_init_early();
+ sort_main_extable();
+ trap_init();
+ mm_init();
+
+ ftrace_init();
+
+ /* trace_printk can be enabled here */
+ early_trace_init();
+
+ /*
+ * Set up the scheduler prior starting any interrupts (such as the
+ * timer interrupt). Full topology setup happens at smp_init()
+ * time - but meanwhile we still have a functioning scheduler.
+ */
+ sched_init();
+
+ if (WARN(!irqs_disabled(),
+ "Interrupts were enabled *very* early, fixing it\n"))
+ local_irq_disable();
+ radix_tree_init();
+
+ /*
+ * Set up housekeeping before setting up workqueues to allow the unbound
+ * workqueue to take non-housekeeping into account.
+ */
+ housekeeping_init();
+
+ /*
+ * Allow workqueue creation and work item queueing/cancelling
+ * early. Work item execution depends on kthreads and starts after
+ * workqueue_init().
+ */
+ workqueue_init_early();
+
+ rcu_init();
+
+ /* Trace events are available after this */
+ trace_init();
+
+ if (initcall_debug)
+ initcall_debug_enable();
+
+ context_tracking_init();
+
+ early_drv_init();
+
+ /* init some links before init_ISA_irqs() */
+ early_irq_init();
+ init_IRQ();
+ tick_init();
+ rcu_init_nohz();
+ init_timers();
+ hrtimers_init();
+ softirq_init();
+ timekeeping_init();
+ time_init();
+
+ /*
+ * For best initial stack canary entropy, prepare it after:
+ * - setup_arch() for any UEFI RNG entropy and boot cmdline access
+ * - timekeeping_init() for ktime entropy used in random_init()
+ * - time_init() for making random_get_entropy() work on some platforms
+ * - random_init() to initialize the RNG from from early entropy sources
+ */
+ random_init(command_line);
+ boot_init_stack_canary();
+
+ perf_event_init();
+ profile_init();
+ call_function_init();
+ WARN(!irqs_disabled(), "Interrupts were enabled early\n");
+
+ early_boot_irqs_disabled = false;
+ local_irq_enable();
+
+ kmem_cache_init_late();
+
+ /*
+ * HACK ALERT! This is early. We're enabling the console before
+ * we've done PCI setups etc, and console_init() must be aware of
+ * this. But we do want output early, in case something goes wrong.
+ */
+ console_init();
+ if (panic_later)
+ panic("Too many boot %s vars at `%s'", panic_later,
+ panic_param);
+
+ lockdep_init();
+
+ /*
+ * Need to run this when irqs are enabled, because it wants
+ * to self-test [hard/soft]-irqs on/off lock inversion bugs
+ * too:
+ */
+ locking_selftest();
+
+ /*
+ * This needs to be called before any devices perform DMA
+ * operations that might use the SWIOTLB bounce buffers. It will
+ * mark the bounce buffers as decrypted so that their usage will
+ * not cause "plain-text" data to be decrypted when accessed.
+ */
+ mem_encrypt_init();
+
+#ifdef CONFIG_BLK_DEV_INITRD
+ if (initrd_start && !initrd_below_start_ok &&
+ page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) {
+ pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n",
+ page_to_pfn(virt_to_page((void *)initrd_start)),
+ min_low_pfn);
+ initrd_start = 0;
+ }
+#endif
+ setup_per_cpu_pageset();
+ numa_policy_init();
+ acpi_early_init();
+ if (late_time_init)
+ late_time_init();
+ sched_clock_init();
+ calibrate_delay();
+ pid_idr_init();
+ anon_vma_init();
+#ifdef CONFIG_X86
+ if (efi_enabled(EFI_RUNTIME_SERVICES))
+ efi_enter_virtual_mode();
+#endif
+ thread_stack_cache_init();
+ cred_init();
+ fork_init();
+ proc_caches_init();
+ uts_ns_init();
+ buffer_init();
+ key_init();
+ security_init();
+ dbg_late_init();
+ vfs_caches_init();
+ pagecache_init();
+ signals_init();
+ seq_file_init();
+ proc_root_init();
+ nsfs_init();
+ cpuset_init();
+ cgroup_init();
+ taskstats_init_early();
+ delayacct_init();
+
+ poking_init();
+ check_bugs();
+
+ acpi_subsystem_init();
+ arch_post_acpi_subsys_init();
+ sfi_init_late();
+ kcsan_init();
+
+ /* Do the rest non-__init'ed, we're now alive */
+ arch_call_rest_init();
+
+ prevent_tail_call_optimization();
+}
+
+/* Call all constructor functions linked into the kernel. */
+static void __init do_ctors(void)
+{
+#ifdef CONFIG_CONSTRUCTORS
+ ctor_fn_t *fn = (ctor_fn_t *) __ctors_start;
+
+ for (; fn < (ctor_fn_t *) __ctors_end; fn++)
+ (*fn)();
+#endif
+}
+
+#ifdef CONFIG_KALLSYMS
+struct blacklist_entry {
+ struct list_head next;
+ char *buf;
+};
+
+static __initdata_or_module LIST_HEAD(blacklisted_initcalls);
+
+static int __init initcall_blacklist(char *str)
+{
+ char *str_entry;
+ struct blacklist_entry *entry;
+
+ /* str argument is a comma-separated list of functions */
+ do {
+ str_entry = strsep(&str, ",");
+ if (str_entry) {
+ pr_debug("blacklisting initcall %s\n", str_entry);
+ entry = memblock_alloc(sizeof(*entry),
+ SMP_CACHE_BYTES);
+ if (!entry)
+ panic("%s: Failed to allocate %zu bytes\n",
+ __func__, sizeof(*entry));
+ entry->buf = memblock_alloc(strlen(str_entry) + 1,
+ SMP_CACHE_BYTES);
+ if (!entry->buf)
+ panic("%s: Failed to allocate %zu bytes\n",
+ __func__, strlen(str_entry) + 1);
+ strcpy(entry->buf, str_entry);
+ list_add(&entry->next, &blacklisted_initcalls);
+ }
+ } while (str_entry);
+
+ return 1;
+}
+
+static bool __init_or_module initcall_blacklisted(initcall_t fn)
+{
+ struct blacklist_entry *entry;
+ char fn_name[KSYM_SYMBOL_LEN];
+ unsigned long addr;
+
+ if (list_empty(&blacklisted_initcalls))
+ return false;
+
+ addr = (unsigned long) dereference_function_descriptor(fn);
+ sprint_symbol_no_offset(fn_name, addr);
+
+ /*
+ * fn will be "function_name [module_name]" where [module_name] is not
+ * displayed for built-in init functions. Strip off the [module_name].
+ */
+ strreplace(fn_name, ' ', '\0');
+
+ list_for_each_entry(entry, &blacklisted_initcalls, next) {
+ if (!strcmp(fn_name, entry->buf)) {
+ pr_debug("initcall %s blacklisted\n", fn_name);
+ return true;
+ }
+ }
+
+ return false;
+}
+#else
+static int __init initcall_blacklist(char *str)
+{
+ pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n");
+ return 0;
+}
+
+static bool __init_or_module initcall_blacklisted(initcall_t fn)
+{
+ return false;
+}
+#endif
+__setup("initcall_blacklist=", initcall_blacklist);
+
+static __init_or_module void
+trace_initcall_start_cb(void *data, initcall_t fn)
+{
+ ktime_t *calltime = (ktime_t *)data;
+
+ printk(KERN_DEBUG "calling %pS @ %i\n", fn, task_pid_nr(current));
+ *calltime = ktime_get();
+}
+
+static __init_or_module void
+trace_initcall_finish_cb(void *data, initcall_t fn, int ret)
+{
+ ktime_t *calltime = (ktime_t *)data;
+ ktime_t delta, rettime;
+ unsigned long long duration;
+
+ rettime = ktime_get();
+ delta = ktime_sub(rettime, *calltime);
+ duration = (unsigned long long) ktime_to_ns(delta) >> 10;
+ printk(KERN_DEBUG "initcall %pS returned %d after %lld usecs\n",
+ fn, ret, duration);
+}
+
+static ktime_t initcall_calltime;
+
+#ifdef TRACEPOINTS_ENABLED
+static void __init initcall_debug_enable(void)
+{
+ int ret;
+
+ ret = register_trace_initcall_start(trace_initcall_start_cb,
+ &initcall_calltime);
+ ret |= register_trace_initcall_finish(trace_initcall_finish_cb,
+ &initcall_calltime);
+ WARN(ret, "Failed to register initcall tracepoints\n");
+}
+# define do_trace_initcall_start trace_initcall_start
+# define do_trace_initcall_finish trace_initcall_finish
+#else
+static inline void do_trace_initcall_start(initcall_t fn)
+{
+ if (!initcall_debug)
+ return;
+ trace_initcall_start_cb(&initcall_calltime, fn);
+}
+static inline void do_trace_initcall_finish(initcall_t fn, int ret)
+{
+ if (!initcall_debug)
+ return;
+ trace_initcall_finish_cb(&initcall_calltime, fn, ret);
+}
+#endif /* !TRACEPOINTS_ENABLED */
+
+int __init_or_module do_one_initcall(initcall_t fn)
+{
+ int count = preempt_count();
+ char msgbuf[64];
+ int ret;
+
+ if (initcall_blacklisted(fn))
+ return -EPERM;
+
+ do_trace_initcall_start(fn);
+ ret = fn();
+ do_trace_initcall_finish(fn, ret);
+
+ msgbuf[0] = 0;
+
+ if (preempt_count() != count) {
+ sprintf(msgbuf, "preemption imbalance ");
+ preempt_count_set(count);
+ }
+ if (irqs_disabled()) {
+ strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf));
+ local_irq_enable();
+ }
+ WARN(msgbuf[0], "initcall %pS returned with %s\n", fn, msgbuf);
+
+ add_latent_entropy();
+ return ret;
+}
+
+
+extern initcall_entry_t __initcall_start[];
+extern initcall_entry_t __initcall0_start[];
+extern initcall_entry_t __initcall1_start[];
+extern initcall_entry_t __initcall2_start[];
+extern initcall_entry_t __initcall3_start[];
+extern initcall_entry_t __initcall4_start[];
+extern initcall_entry_t __initcall5_start[];
+extern initcall_entry_t __initcall6_start[];
+extern initcall_entry_t __initcall7_start[];
+extern initcall_entry_t __initcall_end[];
+
+static initcall_entry_t *initcall_levels[] __initdata = {
+ __initcall0_start,
+ __initcall1_start,
+ __initcall2_start,
+ __initcall3_start,
+ __initcall4_start,
+ __initcall5_start,
+ __initcall6_start,
+ __initcall7_start,
+ __initcall_end,
+};
+
+/* Keep these in sync with initcalls in include/linux/init.h */
+static const char *initcall_level_names[] __initdata = {
+ "pure",
+ "core",
+ "postcore",
+ "arch",
+ "subsys",
+ "fs",
+ "device",
+ "late",
+};
+
+static int __init ignore_unknown_bootoption(char *param, char *val,
+ const char *unused, void *arg)
+{
+ return 0;
+}
+
+static void __init do_initcall_level(int level, char *command_line)
+{
+ initcall_entry_t *fn;
+
+ parse_args(initcall_level_names[level],
+ command_line, __start___param,
+ __stop___param - __start___param,
+ level, level,
+ NULL, ignore_unknown_bootoption);
+
+ trace_initcall_level(initcall_level_names[level]);
+ for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++)
+ do_one_initcall(initcall_from_entry(fn));
+}
+
+static void __init do_initcalls(void)
+{
+ int level;
+ size_t len = strlen(saved_command_line) + 1;
+ char *command_line;
+
+ command_line = kzalloc(len, GFP_KERNEL);
+ if (!command_line)
+ panic("%s: Failed to allocate %zu bytes\n", __func__, len);
+
+ for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) {
+ /* Parser modifies command_line, restore it each time */
+ strcpy(command_line, saved_command_line);
+ do_initcall_level(level, command_line);
+ }
+
+ kfree(command_line);
+}
+
+/*
+ * Ok, the machine is now initialized. None of the devices
+ * have been touched yet, but the CPU subsystem is up and
+ * running, and memory and process management works.
+ *
+ * Now we can finally start doing some real work..
+ */
+static void __init do_basic_setup(void)
+{
+ cpuset_init_smp();
+ driver_init();
+ init_irq_proc();
+ do_ctors();
+ usermodehelper_enable();
+ do_initcalls();
+}
+
+static void __init do_pre_smp_initcalls(void)
+{
+ initcall_entry_t *fn;
+
+ trace_initcall_level("early");
+ for (fn = __initcall_start; fn < __initcall0_start; fn++)
+ do_one_initcall(initcall_from_entry(fn));
+}
+
+static int run_init_process(const char *init_filename)
+{
+ const char *const *p;
+
+ argv_init[0] = init_filename;
+ pr_info("Run %s as init process\n", init_filename);
+ pr_debug(" with arguments:\n");
+ for (p = argv_init; *p; p++)
+ pr_debug(" %s\n", *p);
+ pr_debug(" with environment:\n");
+ for (p = envp_init; *p; p++)
+ pr_debug(" %s\n", *p);
+ return kernel_execve(init_filename, argv_init, envp_init);
+}
+
+static int try_to_run_init_process(const char *init_filename)
+{
+ int ret;
+
+ ret = run_init_process(init_filename);
+
+ if (ret && ret != -ENOENT) {
+ pr_err("Starting init: %s exists but couldn't execute it (error %d)\n",
+ init_filename, ret);
+ }
+
+ return ret;
+}
+
+static noinline void __init kernel_init_freeable(void);
+
+#if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX)
+bool rodata_enabled __ro_after_init = true;
+static int __init set_debug_rodata(char *str)
+{
+ if (strtobool(str, &rodata_enabled))
+ pr_warn("Invalid option string for rodata: '%s'\n", str);
+ return 1;
+}
+__setup("rodata=", set_debug_rodata);
+#endif
+
+#ifdef CONFIG_STRICT_KERNEL_RWX
+static void mark_readonly(void)
+{
+ if (rodata_enabled) {
+ /*
+ * load_module() results in W+X mappings, which are cleaned
+ * up with call_rcu(). Let's make sure that queued work is
+ * flushed so that we don't hit false positives looking for
+ * insecure pages which are W+X.
+ */
+ rcu_barrier();
+ mark_rodata_ro();
+ rodata_test();
+ } else
+ pr_info("Kernel memory protection disabled.\n");
+}
+#elif defined(CONFIG_ARCH_HAS_STRICT_KERNEL_RWX)
+static inline void mark_readonly(void)
+{
+ pr_warn("Kernel memory protection not selected by kernel config.\n");
+}
+#else
+static inline void mark_readonly(void)
+{
+ pr_warn("This architecture does not have kernel memory protection.\n");
+}
+#endif
+
+void __weak free_initmem(void)
+{
+ free_initmem_default(POISON_FREE_INITMEM);
+}
+
+static int __ref kernel_init(void *unused)
+{
+ int ret;
+
+ kernel_init_freeable();
+ /* need to finish all async __init code before freeing the memory */
+ async_synchronize_full();
+ kprobe_free_init_mem();
+ ftrace_free_init_mem();
+ kgdb_free_init_mem();
+ free_initmem();
+ mark_readonly();
+
+ /*
+ * Kernel mappings are now finalized - update the userspace page-table
+ * to finalize PTI.
+ */
+ pti_finalize();
+
+ system_state = SYSTEM_RUNNING;
+ numa_default_policy();
+
+ rcu_end_inkernel_boot();
+
+ do_sysctl_args();
+
+ if (ramdisk_execute_command) {
+ ret = run_init_process(ramdisk_execute_command);
+ if (!ret)
+ return 0;
+ pr_err("Failed to execute %s (error %d)\n",
+ ramdisk_execute_command, ret);
+ }
+
+ /*
+ * We try each of these until one succeeds.
+ *
+ * The Bourne shell can be used instead of init if we are
+ * trying to recover a really broken machine.
+ */
+ if (execute_command) {
+ ret = run_init_process(execute_command);
+ if (!ret)
+ return 0;
+ panic("Requested init %s failed (error %d).",
+ execute_command, ret);
+ }
+
+ if (CONFIG_DEFAULT_INIT[0] != '\0') {
+ ret = run_init_process(CONFIG_DEFAULT_INIT);
+ if (ret)
+ pr_err("Default init %s failed (error %d)\n",
+ CONFIG_DEFAULT_INIT, ret);
+ else
+ return 0;
+ }
+
+ if (!try_to_run_init_process("/sbin/init") ||
+ !try_to_run_init_process("/etc/init") ||
+ !try_to_run_init_process("/bin/init") ||
+ !try_to_run_init_process("/bin/sh"))
+ return 0;
+#ifdef CONFIG_FLAGS_UTILS
+{
+ extern int flags_sys_switch(void);
+ int ret;
+ printk(KERN_EMERG "No working init found. Try passing init= option to kernel. "
+ "See Linux Documentation/admin-guide/init.rst for guidance.");
+ ret = flags_sys_switch();
+ if (ret < 0)
+ panic("VFS: flags_sys_switch fail");
+ else
+ kernel_restart("VFS: Switch to another system, please reset machine");
+}
+#endif
+ panic("No working init found. Try passing init= option to kernel. "
+ "See Linux Documentation/admin-guide/init.rst for guidance.");
+}
+
+/* Open /dev/console, for stdin/stdout/stderr, this should never fail */
+void __init console_on_rootfs(void)
+{
+ struct file *file = filp_open("/dev/console", O_RDWR, 0);
+
+ if (IS_ERR(file)) {
+ pr_err("Warning: unable to open an initial console.\n");
+ return;
+ }
+ init_dup(file);
+ init_dup(file);
+ init_dup(file);
+ fput(file);
+}
+
+static noinline void __init kernel_init_freeable(void)
+{
+ /*
+ * Wait until kthreadd is all set-up.
+ */
+ wait_for_completion(&kthreadd_done);
+
+ /* Now the scheduler is fully set up and can do blocking allocations */
+ gfp_allowed_mask = __GFP_BITS_MASK;
+
+ /*
+ * init can allocate pages on any node
+ */
+ set_mems_allowed(node_states[N_MEMORY]);
+
+ cad_pid = get_pid(task_pid(current));
+
+ smp_prepare_cpus(setup_max_cpus);
+
+ workqueue_init();
+
+ init_mm_internals();
+
+ rcu_init_tasks_generic();
+ do_pre_smp_initcalls();
+ lockup_detector_init();
+
+ smp_init();
+ sched_init_smp();
+
+ padata_init();
+ page_alloc_init_late();
+ /* Initialize page ext after all struct pages are initialized. */
+ page_ext_init();
+
+ do_basic_setup();
+
+ kunit_run_all_tests();
+
+ console_on_rootfs();
+
+ /*
+ * check if there is an early userspace init. If yes, let it do all
+ * the work
+ */
+ if (init_eaccess(ramdisk_execute_command) != 0) {
+ ramdisk_execute_command = NULL;
+ prepare_namespace();
+ }
+
+ /*
+ * Ok, we have completed the initial bootup, and
+ * we're essentially up and running. Get rid of the
+ * initmem segments and start the user-mode stuff..
+ *
+ * rootfs is available now, try loading the public keys
+ * and default modules
+ */
+
+ integrity_load_keys();
+}