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authorWaldemar Brodkorb <wbx@openadk.org>2020-10-31 03:16:45 +0100
committerWaldemar Brodkorb <wbx@openadk.org>2020-10-31 03:16:45 +0100
commitf0957cdddb30deea927a5e90c12ad0d4c610f2e0 (patch)
tree42b6c19a7ab25f37808f9217a9b96b20ca7bd1bd
parent816ca7e93f19ff3ad02d04b95334206d1be58173 (diff)
linux: automatically mount devtmpfs for initramfs base systems
-rw-r--r--target/linux/patches/5.4.69/startup.patch1254
1 files changed, 1249 insertions, 5 deletions
diff --git a/target/linux/patches/5.4.69/startup.patch b/target/linux/patches/5.4.69/startup.patch
index 7c6c5661a..e2f2ae65a 100644
--- a/target/linux/patches/5.4.69/startup.patch
+++ b/target/linux/patches/5.4.69/startup.patch
@@ -1,7 +1,20 @@
-diff -Nur linux-5.4.53.orig/init/main.c linux-5.4.53/init/main.c
---- linux-5.4.53.orig/init/main.c 2020-07-22 09:33:18.000000000 +0200
-+++ linux-5.4.53/init/main.c 2020-07-28 17:33:28.000000000 +0200
-@@ -1196,6 +1196,8 @@
+diff -Nur linux-5.4.69.orig/init/initramfs.c linux-5.4.69/init/initramfs.c
+--- linux-5.4.69.orig/init/initramfs.c 2020-10-01 13:19:27.000000000 +0200
++++ linux-5.4.69/init/initramfs.c 2020-10-31 02:34:40.814412219 +0100
+@@ -674,6 +674,9 @@
+ initrd_start = 0;
+ initrd_end = 0;
+
++#ifdef CONFIG_DEVTMPFS_MOUNT
++ devtmpfs_mount("dev");
++#endif
+ flush_delayed_fput();
+ return 0;
+ }
+diff -Nur linux-5.4.69.orig/init/main.c linux-5.4.69/init/main.c
+--- linux-5.4.69.orig/init/main.c 2020-10-01 13:19:27.000000000 +0200
++++ linux-5.4.69/init/main.c 2020-10-31 02:32:35.699678836 +0100
+@@ -1198,6 +1198,8 @@
if (ksys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
pr_err("Warning: unable to open an initial console.\n");
@@ -10,7 +23,7 @@ diff -Nur linux-5.4.53.orig/init/main.c linux-5.4.53/init/main.c
(void) ksys_dup(0);
(void) ksys_dup(0);
/*
-@@ -1204,7 +1206,7 @@
+@@ -1206,7 +1208,7 @@
*/
if (!ramdisk_execute_command)
@@ -19,3 +32,1234 @@ diff -Nur linux-5.4.53.orig/init/main.c linux-5.4.53/init/main.c
if (ksys_access((const char __user *)
ramdisk_execute_command, 0) != 0) {
+diff -Nur linux-5.4.69.orig/init/main.c.orig linux-5.4.69/init/main.c.orig
+--- linux-5.4.69.orig/init/main.c.orig 1970-01-01 01:00:00.000000000 +0100
++++ linux-5.4.69/init/main.c.orig 2020-10-01 13:19:27.000000000 +0200
+@@ -0,0 +1,1227 @@
++// 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/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/pid_namespace.h>
++#include <linux/device.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 <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>
++
++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;
++/* Command line for per-initcall parameter parsing */
++static char *initcall_command_line;
++
++static char *execute_command;
++static char *ramdisk_execute_command;
++
++/*
++ * 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);
++
++/* Change NUL term back to "=", to make "param" the whole string. */
++static int __init repair_env_string(char *param, char *val,
++ const char *unused, void *arg)
++{
++ 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);
++ val--;
++ } else
++ BUG();
++ }
++ return 0;
++}
++
++/* 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, unused, NULL);
++
++ 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)
++{
++ repair_env_string(param, val, unused, NULL);
++
++ /* Handle obsolete-style parameters */
++ if (obsolete_checksetup(param))
++ return 0;
++
++ /* Unused module parameter. */
++ if (strchr(param, '.') && (!val || strchr(param, '.') < val))
++ 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], val - param))
++ 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 = strlen(boot_command_line) + 1;
++
++ saved_command_line = memblock_alloc(len, SMP_CACHE_BYTES);
++ if (!saved_command_line)
++ panic("%s: Failed to allocate %zu bytes\n", __func__, len);
++
++ initcall_command_line = memblock_alloc(len, SMP_CACHE_BYTES);
++ if (!initcall_command_line)
++ panic("%s: Failed to allocate %zu bytes\n", __func__, len);
++
++ static_command_line = memblock_alloc(len, SMP_CACHE_BYTES);
++ if (!static_command_line)
++ panic("%s: Failed to allocate %zu bytes\n", __func__, len);
++
++ strcpy(saved_command_line, boot_command_line);
++ strcpy(static_command_line, 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);
++
++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))
++ stack = "all";
++ else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL))
++ stack = "byref_all";
++ else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF))
++ stack = "byref";
++ else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_USER))
++ stack = "__user";
++ 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();
++}
++
++asmlinkage __visible void __init 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_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", boot_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);
++
++ /*
++ * 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();
++ /*
++ * Disable preemption - early bootup scheduling is extremely
++ * fragile until we cpu_idle() for the first time.
++ */
++ preempt_disable();
++ 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();
++ /* 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();
++
++ /*
++ * 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 rand_initialize()
++ * - rand_initialize() to get any arch-specific entropy like RDRAND
++ * - add_latent_entropy() to get any latent entropy
++ * - adding command line entropy
++ */
++ rand_initialize();
++ add_latent_entropy();
++ add_device_randomness(command_line, strlen(command_line));
++ boot_init_stack_canary();
++
++ time_init();
++ 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();
++
++ /* 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 0;
++}
++
++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 void __init do_initcall_level(int level)
++{
++ initcall_entry_t *fn;
++
++ strcpy(initcall_command_line, saved_command_line);
++ parse_args(initcall_level_names[level],
++ initcall_command_line, __start___param,
++ __stop___param - __start___param,
++ level, level,
++ NULL, &repair_env_string);
++
++ 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;
++
++ for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++)
++ do_initcall_level(level);
++}
++
++/*
++ * 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)
++{
++ argv_init[0] = init_filename;
++ pr_info("Run %s as init process\n", init_filename);
++ return do_execve(getname_kernel(init_filename),
++ (const char __user *const __user *)argv_init,
++ (const char __user *const __user *)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)
++{
++ return strtobool(str, &rodata_enabled);
++}
++__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");
++}
++#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();
++ 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();
++
++ 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 (!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;
++
++ panic("No working init found. Try passing init= option to kernel. "
++ "See Linux Documentation/admin-guide/init.rst for guidance.");
++}
++
++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 = task_pid(current);
++
++ smp_prepare_cpus(setup_max_cpus);
++
++ workqueue_init();
++
++ init_mm_internals();
++
++ do_pre_smp_initcalls();
++ lockup_detector_init();
++
++ smp_init();
++ sched_init_smp();
++
++ page_alloc_init_late();
++ /* Initialize page ext after all struct pages are initialized. */
++ page_ext_init();
++
++ do_basic_setup();
++
++ /* Open the /dev/console on the rootfs, this should never fail */
++ if (ksys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
++ pr_err("Warning: unable to open an initial console.\n");
++
++ (void) ksys_dup(0);
++ (void) ksys_dup(0);
++ /*
++ * check if there is an early userspace init. If yes, let it do all
++ * the work
++ */
++
++ if (!ramdisk_execute_command)
++ ramdisk_execute_command = "/init";
++
++ if (ksys_access((const char __user *)
++ ramdisk_execute_command, 0) != 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();
++}