mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 01:10:04 +00:00
![Tejun Heo](/assets/img/avatar_default.png)
During early boot, local IRQ is disabled until IRQ subsystem is properly initialized. During this time, no one should enable local IRQ and some operations which usually are not allowed with IRQ disabled, e.g. operations which might sleep or require communications with other processors, are allowed. lockdep tracked this with early_boot_irqs_off/on() callbacks. As other subsystems need this information too, move it to init/main.c and make it generally available. While at it, toggle the boolean to early_boot_irqs_disabled instead of enabled so that it can be initialized with %false and %true indicates the exceptional condition. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Pekka Enberg <penberg@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> LKML-Reference: <20110120110635.GB6036@htj.dyndns.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
927 lines
22 KiB
C
927 lines
22 KiB
C
/*
|
|
* 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/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/bootmem.h>
|
|
#include <linux/acpi.h>
|
|
#include <linux/tty.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/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/buffer_head.h>
|
|
#include <linux/page_cgroup.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/signal.h>
|
|
#include <linux/idr.h>
|
|
#include <linux/kgdb.h>
|
|
#include <linux/ftrace.h>
|
|
#include <linux/async.h>
|
|
#include <linux/kmemcheck.h>
|
|
#include <linux/sfi.h>
|
|
#include <linux/shmem_fs.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/perf_event.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
|
|
|
|
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);
|
|
#ifndef CONFIG_DEBUG_RODATA
|
|
static inline void mark_rodata_ro(void) { }
|
|
#endif
|
|
|
|
#ifdef CONFIG_TC
|
|
extern void tc_init(void);
|
|
#endif
|
|
|
|
/*
|
|
* 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);
|
|
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 setup_max_cpus = NR_CPUS;
|
|
EXPORT_SYMBOL(setup_max_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>.
|
|
*/
|
|
|
|
void __weak arch_disable_smp_support(void) { }
|
|
|
|
static int __init nosmp(char *str)
|
|
{
|
|
setup_max_cpus = 0;
|
|
arch_disable_smp_support();
|
|
|
|
return 0;
|
|
}
|
|
|
|
early_param("nosmp", nosmp);
|
|
|
|
/* this is hard limit */
|
|
static int __init nrcpus(char *str)
|
|
{
|
|
int nr_cpus;
|
|
|
|
get_option(&str, &nr_cpus);
|
|
if (nr_cpus > 0 && nr_cpus < nr_cpu_ids)
|
|
nr_cpu_ids = nr_cpus;
|
|
|
|
return 0;
|
|
}
|
|
|
|
early_param("nr_cpus", nrcpus);
|
|
|
|
static int __init maxcpus(char *str)
|
|
{
|
|
get_option(&str, &setup_max_cpus);
|
|
if (setup_max_cpus == 0)
|
|
arch_disable_smp_support();
|
|
|
|
return 0;
|
|
}
|
|
|
|
early_param("maxcpus", maxcpus);
|
|
#else
|
|
static const unsigned int 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 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 int __init obsolete_checksetup(char *line)
|
|
{
|
|
const 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
|
|
* unused parameters (modprobe will find them in /proc/cmdline).
|
|
*/
|
|
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;
|
|
|
|
/* 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 = "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_nr_cpu_ids(void) { }
|
|
static inline void smp_prepare_cpus(unsigned int maxcpus) { }
|
|
|
|
#else
|
|
|
|
/* 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)
|
|
{
|
|
nr_cpu_ids = find_last_bit(cpumask_bits(cpu_possible_mask),NR_CPUS) + 1;
|
|
}
|
|
|
|
/* Called by boot processor to activate the rest. */
|
|
static void __init smp_init(void)
|
|
{
|
|
unsigned int cpu;
|
|
|
|
/* 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 __initdata DECLARE_COMPLETION(kthreadd_done);
|
|
|
|
static noinline void __init_refok rest_init(void)
|
|
{
|
|
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.
|
|
*/
|
|
kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND);
|
|
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();
|
|
complete(&kthreadd_done);
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
const 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;
|
|
}
|
|
|
|
void __init parse_early_options(char *cmdline)
|
|
{
|
|
parse_args("early options", cmdline, NULL, 0, do_early_param);
|
|
}
|
|
|
|
/* 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_early_options(tmp_cmdline);
|
|
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 */
|
|
set_cpu_online(cpu, true);
|
|
set_cpu_active(cpu, true);
|
|
set_cpu_present(cpu, true);
|
|
set_cpu_possible(cpu, true);
|
|
}
|
|
|
|
void __init __weak smp_setup_processor_id(void)
|
|
{
|
|
}
|
|
|
|
void __init __weak thread_info_cache_init(void)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* Set up kernel memory allocators
|
|
*/
|
|
static void __init mm_init(void)
|
|
{
|
|
/*
|
|
* page_cgroup requires countinous pages as memmap
|
|
* and it's bigger than MAX_ORDER unless SPARSEMEM.
|
|
*/
|
|
page_cgroup_init_flatmem();
|
|
mem_init();
|
|
kmem_cache_init();
|
|
percpu_init_late();
|
|
pgtable_cache_init();
|
|
vmalloc_init();
|
|
}
|
|
|
|
asmlinkage void __init start_kernel(void)
|
|
{
|
|
char * command_line;
|
|
extern const struct kernel_param __start___param[], __stop___param[];
|
|
|
|
smp_setup_processor_id();
|
|
|
|
/*
|
|
* Need to run as early as possible, to initialize the
|
|
* lockdep hash:
|
|
*/
|
|
lockdep_init();
|
|
debug_objects_early_init();
|
|
|
|
/*
|
|
* Set up the the initial canary ASAP:
|
|
*/
|
|
boot_init_stack_canary();
|
|
|
|
cgroup_init_early();
|
|
|
|
local_irq_disable();
|
|
early_boot_irqs_disabled = true;
|
|
|
|
/*
|
|
* Interrupts are still disabled. Do necessary setups, then
|
|
* enable them
|
|
*/
|
|
tick_init();
|
|
boot_cpu_init();
|
|
page_address_init();
|
|
printk(KERN_NOTICE "%s", linux_banner);
|
|
setup_arch(&command_line);
|
|
mm_init_owner(&init_mm, &init_task);
|
|
setup_command_line(command_line);
|
|
setup_nr_cpu_ids();
|
|
setup_per_cpu_areas();
|
|
smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */
|
|
|
|
build_all_zonelists(NULL);
|
|
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);
|
|
/*
|
|
* These use large bootmem allocations and must precede
|
|
* kmem_cache_init()
|
|
*/
|
|
pidhash_init();
|
|
vfs_caches_init_early();
|
|
sort_main_extable();
|
|
trap_init();
|
|
mm_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 (!irqs_disabled()) {
|
|
printk(KERN_WARNING "start_kernel(): bug: interrupts were "
|
|
"enabled *very* early, fixing it\n");
|
|
local_irq_disable();
|
|
}
|
|
idr_init_cache();
|
|
perf_event_init();
|
|
rcu_init();
|
|
radix_tree_init();
|
|
/* init some links before init_ISA_irqs() */
|
|
early_irq_init();
|
|
init_IRQ();
|
|
prio_tree_init();
|
|
init_timers();
|
|
hrtimers_init();
|
|
softirq_init();
|
|
timekeeping_init();
|
|
time_init();
|
|
profile_init();
|
|
if (!irqs_disabled())
|
|
printk(KERN_CRIT "start_kernel(): bug: interrupts were "
|
|
"enabled early\n");
|
|
early_boot_irqs_disabled = false;
|
|
local_irq_enable();
|
|
|
|
/* Interrupts are enabled now so all GFP allocations are safe. */
|
|
gfp_allowed_mask = __GFP_BITS_MASK;
|
|
|
|
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(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
|
|
page_cgroup_init();
|
|
enable_debug_pagealloc();
|
|
kmemleak_init();
|
|
debug_objects_mem_init();
|
|
setup_per_cpu_pageset();
|
|
numa_policy_init();
|
|
if (late_time_init)
|
|
late_time_init();
|
|
sched_clock_init();
|
|
calibrate_delay();
|
|
pidmap_init();
|
|
anon_vma_init();
|
|
#ifdef CONFIG_X86
|
|
if (efi_enabled)
|
|
efi_enter_virtual_mode();
|
|
#endif
|
|
thread_info_cache_init();
|
|
cred_init();
|
|
fork_init(totalram_pages);
|
|
proc_caches_init();
|
|
buffer_init();
|
|
key_init();
|
|
security_init();
|
|
dbg_late_init();
|
|
vfs_caches_init(totalram_pages);
|
|
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 */
|
|
sfi_init_late();
|
|
|
|
ftrace_init();
|
|
|
|
/* Do the rest non-__init'ed, we're now alive */
|
|
rest_init();
|
|
}
|
|
|
|
/* 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
|
|
}
|
|
|
|
int initcall_debug;
|
|
core_param(initcall_debug, initcall_debug, bool, 0644);
|
|
|
|
static char msgbuf[64];
|
|
|
|
static int __init_or_module do_one_initcall_debug(initcall_t fn)
|
|
{
|
|
ktime_t calltime, delta, rettime;
|
|
unsigned long long duration;
|
|
int ret;
|
|
|
|
printk(KERN_DEBUG "calling %pF @ %i\n", fn, task_pid_nr(current));
|
|
calltime = ktime_get();
|
|
ret = fn();
|
|
rettime = ktime_get();
|
|
delta = ktime_sub(rettime, calltime);
|
|
duration = (unsigned long long) ktime_to_ns(delta) >> 10;
|
|
printk(KERN_DEBUG "initcall %pF returned %d after %lld usecs\n", fn,
|
|
ret, duration);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int __init_or_module do_one_initcall(initcall_t fn)
|
|
{
|
|
int count = preempt_count();
|
|
int ret;
|
|
|
|
if (initcall_debug)
|
|
ret = do_one_initcall_debug(fn);
|
|
else
|
|
ret = fn();
|
|
|
|
msgbuf[0] = 0;
|
|
|
|
if (ret && ret != -ENODEV && initcall_debug)
|
|
sprintf(msgbuf, "error code %d ", ret);
|
|
|
|
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 ret;
|
|
}
|
|
|
|
|
|
extern initcall_t __initcall_start[], __initcall_end[], __early_initcall_end[];
|
|
|
|
static void __init do_initcalls(void)
|
|
{
|
|
initcall_t *fn;
|
|
|
|
for (fn = __early_initcall_end; fn < __initcall_end; fn++)
|
|
do_one_initcall(*fn);
|
|
}
|
|
|
|
/*
|
|
* 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();
|
|
usermodehelper_init();
|
|
init_tmpfs();
|
|
driver_init();
|
|
init_irq_proc();
|
|
do_ctors();
|
|
do_initcalls();
|
|
}
|
|
|
|
static void __init do_pre_smp_initcalls(void)
|
|
{
|
|
initcall_t *fn;
|
|
|
|
for (fn = __initcall_start; fn < __early_initcall_end; fn++)
|
|
do_one_initcall(*fn);
|
|
}
|
|
|
|
static void run_init_process(const 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 noinline int init_post(void)
|
|
{
|
|
/* need to finish all async __init code before freeing the memory */
|
|
async_synchronize_full();
|
|
free_initmem();
|
|
mark_rodata_ro();
|
|
system_state = SYSTEM_RUNNING;
|
|
numa_default_policy();
|
|
|
|
|
|
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. "
|
|
"See Linux Documentation/init.txt for guidance.");
|
|
}
|
|
|
|
static int __init kernel_init(void * unused)
|
|
{
|
|
/*
|
|
* Wait until kthreadd is all set-up.
|
|
*/
|
|
wait_for_completion(&kthreadd_done);
|
|
/*
|
|
* init can allocate pages on any node
|
|
*/
|
|
set_mems_allowed(node_states[N_HIGH_MEMORY]);
|
|
/*
|
|
* init can run on any cpu.
|
|
*/
|
|
set_cpus_allowed_ptr(current, cpu_all_mask);
|
|
/*
|
|
* 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();
|
|
lockup_detector_init();
|
|
|
|
smp_init();
|
|
sched_init_smp();
|
|
|
|
do_basic_setup();
|
|
|
|
/* Open the /dev/console on the rootfs, this should never fail */
|
|
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);
|
|
/*
|
|
* 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..
|
|
*/
|
|
|
|
init_post();
|
|
return 0;
|
|
}
|