Initial import of modified Linux 2.6.28 tree

Original upstream URL:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git | branch linux-2.6.28.y

1 files changed, 888 insertions, 0 deletions

diff --git a/init/main.c b/init/main.c
new file mode 100644
index 0000000..7e117a2
--- /dev/null
+++ b/init/main.c
@@ -0,0 +1,888 @@
+/*
+ *  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> 
+ */
+
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/proc_fs.h>
+#include <linux/kernel.h>
+#include <linux/syscalls.h>
+#include <linux/string.h>
+#include <linux/ctype.h>
+#include <linux/delay.h>
+#include <linux/utsname.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/smp_lock.h>
+#include <linux/initrd.h>
+#include <linux/bootmem.h>
+#include <linux/tty.h>
+#include <linux/gfp.h>
+#include <linux/percpu.h>
+#include <linux/kmod.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/workqueue.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/interrupt.h>
+#include <linux/taskstats_kern.h>
+#include <linux/delayacct.h>
+#include <linux/unistd.h>
+#include <linux/rmap.h>
+#include <linux/mempolicy.h>
+#include <linux/key.h>
+#include <linux/unwind.h>
+#include <linux/buffer_head.h>
+#include <linux/page_cgroup.h>
+#include <linux/debug_locks.h>
+#include <linux/debugobjects.h>
+#include <linux/lockdep.h>
+#include <linux/pid_namespace.h>
+#include <linux/device.h>
+#include <linux/kthread.h>
+#include <linux/sched.h>
+#include <linux/signal.h>
+#include <linux/idr.h>
+#include <linux/ftrace.h>
+
+#include <asm/io.h>
+#include <asm/bugs.h>
+#include <asm/setup.h>
+#include <asm/sections.h>
+#include <asm/cacheflush.h>
+
+#ifdef CONFIG_X86_LOCAL_APIC
+#include <asm/smp.h>
+#endif
+
+/*
+ * This is one of the first .c files built. Error out early if we have compiler
+ * trouble.
+ */
+
+#if __GNUC__ == 4 && __GNUC_MINOR__ == 1 && __GNUC_PATCHLEVEL__ == 0
+#warning gcc-4.1.0 is known to miscompile the kernel.  A different compiler version is recommended.
+#endif
+
+static int kernel_init(void *);
+
+extern void init_IRQ(void);
+extern void fork_init(unsigned long);
+extern void mca_init(void);
+extern void sbus_init(void);
+extern void prio_tree_init(void);
+extern void radix_tree_init(void);
+extern void free_initmem(void);
+#ifdef	CONFIG_ACPI
+extern void acpi_early_init(void);
+#else
+static inline void acpi_early_init(void) { }
+#endif
+#ifndef CONFIG_DEBUG_RODATA
+static inline void mark_rodata_ro(void) { }
+#endif
+
+#ifdef CONFIG_TC
+extern void tc_init(void);
+#endif
+
+enum system_states system_state;
+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 (*late_time_init)(void);
+extern void softirq_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;
+
+static char *execute_command;
+static char *ramdisk_execute_command;
+
+#ifdef CONFIG_SMP
+/* Setup configured maximum number of CPUs to activate */
+unsigned int __initdata setup_max_cpus = NR_CPUS;
+
+/*
+ * Setup routine for controlling SMP activation
+ *
+ * Command-line option of "nosmp" or "maxcpus=0" will disable SMP
+ * activation entirely (the MPS table probe still happens, though).
+ *
+ * Command-line option of "maxcpus=<NUM>", where <NUM> is an integer
+ * greater than 0, limits the maximum number of CPUs activated in
+ * SMP mode to <NUM>.
+ */
+#ifndef CONFIG_X86_IO_APIC
+static inline void disable_ioapic_setup(void) {};
+#endif
+
+static int __init nosmp(char *str)
+{
+	setup_max_cpus = 0;
+	disable_ioapic_setup();
+	return 0;
+}
+
+early_param("nosmp", nosmp);
+
+static int __init maxcpus(char *str)
+{
+	get_option(&str, &setup_max_cpus);
+	if (setup_max_cpus == 0)
+		disable_ioapic_setup();
+
+	return 0;
+}
+
+early_param("maxcpus", maxcpus);
+#else
+#define setup_max_cpus NR_CPUS
+#endif
+
+/*
+ * 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 situaiton 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 char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
+char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };
+static const char *panic_later, *panic_param;
+
+extern struct obs_kernel_param __setup_start[], __setup_end[];
+
+static int __init obsolete_checksetup(char *line)
+{
+	struct obs_kernel_param *p;
+	int had_early_param = 0;
+
+	p = __setup_start;
+	do {
+		int n = strlen(p->str);
+		if (!strncmp(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 = 1;
+			} else if (!p->setup_func) {
+				printk(KERN_WARNING "Parameter %s is obsolete,"
+				       " ignored\n", p->str);
+				return 1;
+			} else if (p->setup_func(line + n))
+				return 1;
+		}
+		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 = 10;
+	return 0;
+}
+
+static int __init quiet_kernel(char *str)
+{
+	console_loglevel = 4;
+	return 0;
+}
+
+early_param("debug", debug_kernel);
+early_param("quiet", quiet_kernel);
+
+static int __init loglevel(char *str)
+{
+	get_option(&str, &console_loglevel);
+	return 0;
+}
+
+early_param("loglevel", loglevel);
+
+/*
+ * Unknown boot options get handed to init, unless they look like
+ * failed parameters
+ */
+static int __init unknown_bootoption(char *param, char *val)
+{
+	/* Change NUL term back to "=", to make "param" the whole string. */
+	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();
+	}
+
+	/* Handle obsolete-style parameters */
+	if (obsolete_checksetup(param))
+		return 0;
+
+	/*
+	 * Preemptive maintenance for "why didn't my misspelled command
+	 * line work?"
+	 */
+	if (strchr(param, '.') && (!val || strchr(param, '.') < val)) {
+		printk(KERN_ERR "Unknown boot option `%s': ignoring\n", param);
+		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 = "Too many boot env vars at `%s'";
+				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 = "Too many boot init vars at `%s'";
+				panic_param = param;
+			}
+		}
+		argv_init[i] = param;
+	}
+	return 0;
+}
+
+#ifdef CONFIG_DEBUG_PAGEALLOC
+int __read_mostly debug_pagealloc_enabled = 0;
+#endif
+
+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
+
+#ifdef CONFIG_X86_LOCAL_APIC
+static void __init smp_init(void)
+{
+	APIC_init_uniprocessor();
+}
+#else
+#define smp_init()	do { } while (0)
+#endif
+
+static inline void setup_per_cpu_areas(void) { }
+static inline void setup_nr_cpu_ids(void) { }
+static inline void smp_prepare_cpus(unsigned int maxcpus) { }
+
+#else
+
+#if NR_CPUS > BITS_PER_LONG
+cpumask_t cpu_mask_all __read_mostly = CPU_MASK_ALL;
+EXPORT_SYMBOL(cpu_mask_all);
+#endif
+
+/* Setup number of possible processor ids */
+int nr_cpu_ids __read_mostly = NR_CPUS;
+EXPORT_SYMBOL(nr_cpu_ids);
+
+/* An arch may set nr_cpu_ids earlier if needed, so this would be redundant */
+static void __init setup_nr_cpu_ids(void)
+{
+	int cpu, highest_cpu = 0;
+
+	for_each_possible_cpu(cpu)
+		highest_cpu = cpu;
+
+	nr_cpu_ids = highest_cpu + 1;
+}
+
+#ifndef CONFIG_HAVE_SETUP_PER_CPU_AREA
+unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
+
+EXPORT_SYMBOL(__per_cpu_offset);
+
+static void __init setup_per_cpu_areas(void)
+{
+	unsigned long size, i;
+	char *ptr;
+	unsigned long nr_possible_cpus = num_possible_cpus();
+
+	/* Copy section for each CPU (we discard the original) */
+	size = ALIGN(PERCPU_ENOUGH_ROOM, PAGE_SIZE);
+	ptr = alloc_bootmem_pages(size * nr_possible_cpus);
+
+	for_each_possible_cpu(i) {
+		__per_cpu_offset[i] = ptr - __per_cpu_start;
+		memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
+		ptr += size;
+	}
+}
+#endif /* CONFIG_HAVE_SETUP_PER_CPU_AREA */
+
+/* Called by boot processor to activate the rest. */
+static void __init smp_init(void)
+{
+	unsigned int cpu;
+
+	/*
+	 * Set up the current CPU as possible to migrate to.
+	 * The other ones will be done by cpu_up/cpu_down()
+	 */
+	cpu = smp_processor_id();
+	cpu_set(cpu, cpu_active_map);
+
+	/* FIXME: This should be done in userspace --RR */
+	for_each_present_cpu(cpu) {
+		if (num_online_cpus() >= setup_max_cpus)
+			break;
+		if (!cpu_online(cpu))
+			cpu_up(cpu);
+	}
+
+	/* Any cleanup work */
+	printk(KERN_INFO "Brought up %ld CPUs\n", (long)num_online_cpus());
+	smp_cpus_done(setup_max_cpus);
+}
+
+#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)
+{
+	saved_command_line = alloc_bootmem(strlen (boot_command_line)+1);
+	static_command_line = alloc_bootmem(strlen (command_line)+1);
+	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 void noinline __init_refok rest_init(void)
+	__releases(kernel_lock)
+{
+	int pid;
+
+	kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND);
+	numa_default_policy();
+	pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES);
+	kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns);
+	unlock_kernel();
+
+	/*
+	 * The boot idle thread must execute schedule()
+	 * at least once to get things moving:
+	 */
+	init_idle_bootup_task(current);
+	preempt_enable_no_resched();
+	schedule();
+	preempt_disable();
+
+	/* Call into cpu_idle with preempt disabled */
+	cpu_idle();
+}
+
+/* Check for early params. */
+static int __init do_early_param(char *param, char *val)
+{
+	struct obs_kernel_param *p;
+
+	for (p = __setup_start; p < __setup_end; p++) {
+		if ((p->early && strcmp(param, p->str) == 0) ||
+		    (strcmp(param, "console") == 0 &&
+		     strcmp(p->str, "earlycon") == 0)
+		) {
+			if (p->setup_func(val) != 0)
+				printk(KERN_WARNING
+				       "Malformed early option '%s'\n", param);
+		}
+	}
+	/* We accept everything at this stage. */
+	return 0;
+}
+
+/* Arch code calls this early on, or if not, just before other parsing. */
+void __init parse_early_param(void)
+{
+	static __initdata int done = 0;
+	static __initdata char tmp_cmdline[COMMAND_LINE_SIZE];
+
+	if (done)
+		return;
+
+	/* All fall through to do_early_param. */
+	strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
+	parse_args("early options", tmp_cmdline, NULL, 0, do_early_param);
+	done = 1;
+}
+
+/*
+ *	Activate the first processor.
+ */
+
+static void __init boot_cpu_init(void)
+{
+	int cpu = smp_processor_id();
+	/* Mark the boot cpu "present", "online" etc for SMP and UP case */
+	cpu_set(cpu, cpu_online_map);
+	cpu_set(cpu, cpu_present_map);
+	cpu_set(cpu, cpu_possible_map);
+}
+
+void __init __weak smp_setup_processor_id(void)
+{
+}
+
+void __init __weak thread_info_cache_init(void)
+{
+}
+
+asmlinkage void __init start_kernel(void)
+{
+	char * command_line;
+	extern struct kernel_param __start___param[], __stop___param[];
+
+	smp_setup_processor_id();
+
+	/*
+	 * Need to run as early as possible, to initialize the
+	 * lockdep hash:
+	 */
+	unwind_init();
+	lockdep_init();
+	debug_objects_early_init();
+	cgroup_init_early();
+
+	local_irq_disable();
+	early_boot_irqs_off();
+	early_init_irq_lock_class();
+
+/*
+ * Interrupts are still disabled. Do necessary setups, then
+ * enable them
+ */
+	lock_kernel();
+	tick_init();
+	boot_cpu_init();
+	page_address_init();
+	printk(KERN_NOTICE);
+	printk(linux_banner);
+	setup_arch(&command_line);
+	mm_init_owner(&init_mm, &init_task);
+	setup_command_line(command_line);
+	unwind_setup();
+	setup_per_cpu_areas();
+	setup_nr_cpu_ids();
+	smp_prepare_boot_cpu();	/* arch-specific boot-cpu hooks */
+
+	/*
+	 * 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();
+	build_all_zonelists();
+	page_alloc_init();
+	printk(KERN_NOTICE "Kernel command line: %s\n", boot_command_line);
+	parse_early_param();
+	parse_args("Booting kernel", static_command_line, __start___param,
+		   __stop___param - __start___param,
+		   &unknown_bootoption);
+	if (!irqs_disabled()) {
+		printk(KERN_WARNING "start_kernel(): bug: interrupts were "
+				"enabled *very* early, fixing it\n");
+		local_irq_disable();
+	}
+	sort_main_extable();
+	trap_init();
+	rcu_init();
+	init_IRQ();
+	pidhash_init();
+	init_timers();
+	hrtimers_init();
+	softirq_init();
+	timekeeping_init();
+	time_init();
+	sched_clock_init();
+	profile_init();
+	if (!irqs_disabled())
+		printk("start_kernel(): bug: interrupts were enabled early\n");
+	early_boot_irqs_on();
+	local_irq_enable();
+
+	/*
+	 * 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(panic_later, panic_param);
+
+	lockdep_info();
+
+	/*
+	 * 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();
+
+#ifdef CONFIG_BLK_DEV_INITRD
+	if (initrd_start && !initrd_below_start_ok &&
+	    page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) {
+		printk(KERN_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
+	vmalloc_init();
+	vfs_caches_init_early();
+	cpuset_init_early();
+	page_cgroup_init();
+	mem_init();
+	enable_debug_pagealloc();
+	cpu_hotplug_init();
+	kmem_cache_init();
+	debug_objects_mem_init();
+	idr_init_cache();
+	setup_per_cpu_pageset();
+	numa_policy_init();
+	if (late_time_init)
+		late_time_init();
+	calibrate_delay();
+	pidmap_init();
+	pgtable_cache_init();
+	prio_tree_init();
+	anon_vma_init();
+#ifdef CONFIG_X86
+	if (efi_enabled)
+		efi_enter_virtual_mode();
+#endif
+	thread_info_cache_init();
+	fork_init(num_physpages);
+	proc_caches_init();
+	buffer_init();
+	key_init();
+	security_init();
+	vfs_caches_init(num_physpages);
+	radix_tree_init();
+	signals_init();
+	/* rootfs populating might need page-writeback */
+	page_writeback_init();
+#ifdef CONFIG_PROC_FS
+	proc_root_init();
+#endif
+	cgroup_init();
+	cpuset_init();
+	taskstats_init_early();
+	delayacct_init();
+
+	check_bugs();
+
+	acpi_early_init(); /* before LAPIC and SMP init */
+
+	ftrace_init();
+
+	/* Do the rest non-__init'ed, we're now alive */
+	rest_init();
+}
+
+static int initcall_debug;
+core_param(initcall_debug, initcall_debug, bool, 0644);
+
+int do_one_initcall(initcall_t fn)
+{
+	int count = preempt_count();
+	ktime_t delta;
+	char msgbuf[64];
+	struct boot_trace it;
+
+	if (initcall_debug) {
+		it.caller = task_pid_nr(current);
+		printk("calling  %pF @ %i\n", fn, it.caller);
+		it.calltime = ktime_get();
+	}
+
+	it.result = fn();
+
+	if (initcall_debug) {
+		it.rettime = ktime_get();
+		delta = ktime_sub(it.rettime, it.calltime);
+		it.duration = (unsigned long long) delta.tv64 >> 10;
+		printk("initcall %pF returned %d after %Ld usecs\n", fn,
+			it.result, it.duration);
+		trace_boot(&it, fn);
+	}
+
+	msgbuf[0] = 0;
+
+	if (it.result && it.result != -ENODEV && initcall_debug)
+		sprintf(msgbuf, "error code %d ", it.result);
+
+	if (preempt_count() != count) {
+		strlcat(msgbuf, "preemption imbalance ", sizeof(msgbuf));
+		preempt_count() = count;
+	}
+	if (irqs_disabled()) {
+		strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf));
+		local_irq_enable();
+	}
+	if (msgbuf[0]) {
+		printk("initcall %pF returned with %s\n", fn, msgbuf);
+	}
+
+	return it.result;
+}
+
+
+extern initcall_t __initcall_start[], __initcall_end[], __early_initcall_end[];
+
+static void __init do_initcalls(void)
+{
+	initcall_t *call;
+
+	for (call = __early_initcall_end; call < __initcall_end; call++)
+		do_one_initcall(*call);
+
+	/* Make sure there is no pending stuff from the initcall sequence */
+	flush_scheduled_work();
+}
+
+/*
+ * 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)
+{
+	rcu_init_sched(); /* needed by module_init stage. */
+	init_workqueues();
+	usermodehelper_init();
+	driver_init();
+	init_irq_proc();
+	do_initcalls();
+}
+
+static void __init do_pre_smp_initcalls(void)
+{
+	initcall_t *call;
+
+	for (call = __initcall_start; call < __early_initcall_end; call++)
+		do_one_initcall(*call);
+}
+
+static void run_init_process(char *init_filename)
+{
+	argv_init[0] = init_filename;
+	kernel_execve(init_filename, argv_init, envp_init);
+}
+
+/* This is a non __init function. Force it to be noinline otherwise gcc
+ * makes it inline to init() and it becomes part of init.text section
+ */
+static int noinline init_post(void)
+{
+	free_initmem();
+	unlock_kernel();
+	mark_rodata_ro();
+	system_state = SYSTEM_RUNNING;
+	numa_default_policy();
+
+	if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
+		printk(KERN_WARNING "Warning: unable to open an initial console.\n");
+
+	(void) sys_dup(0);
+	(void) sys_dup(0);
+
+	current->signal->flags |= SIGNAL_UNKILLABLE;
+
+	if (ramdisk_execute_command) {
+		run_init_process(ramdisk_execute_command);
+		printk(KERN_WARNING "Failed to execute %s\n",
+				ramdisk_execute_command);
+	}
+
+	/*
+	 * 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) {
+		run_init_process(execute_command);
+		printk(KERN_WARNING "Failed to execute %s.  Attempting "
+					"defaults...\n", execute_command);
+	}
+	run_init_process("/sbin/init");
+	run_init_process("/etc/init");
+	run_init_process("/bin/init");
+	run_init_process("/bin/sh");
+
+	panic("No init found.  Try passing init= option to kernel.");
+}
+
+static int __init kernel_init(void * unused)
+{
+	lock_kernel();
+	/*
+	 * init can run on any cpu.
+	 */
+	set_cpus_allowed_ptr(current, CPU_MASK_ALL_PTR);
+	/*
+	 * Tell the world that we're going to be the grim
+	 * reaper of innocent orphaned children.
+	 *
+	 * We don't want people to have to make incorrect
+	 * assumptions about where in the task array this
+	 * can be found.
+	 */
+	init_pid_ns.child_reaper = current;
+
+	cad_pid = task_pid(current);
+
+	smp_prepare_cpus(setup_max_cpus);
+
+	do_pre_smp_initcalls();
+	start_boot_trace();
+
+	smp_init();
+	sched_init_smp();
+
+	cpuset_init_smp();
+
+	do_basic_setup();
+
+	/*
+	 * 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 (sys_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..
+	 */
+	stop_boot_trace();
+	init_post();
+	return 0;
+}