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![Eric W. Biederman](/assets/img/avatar_default.png)
Currently there is a circular reference between work queue initialization and kthread initialization. This prevents the kthread infrastructure from initializing until after work queues have been initialized. We want the properties of tasks created with kthread_create to be as close as possible to the init_task and to not be contaminated by user processes. The later we start our kthreadd that creates these tasks the harder it is to avoid contamination from user processes and the more of a mess we have to clean up because the defaults have changed on us. So this patch modifies the kthread support to not use work queues but to instead use a simple list of structures, and to have kthreadd start from init_task immediately after our kernel thread that execs /sbin/init. By being a true child of init_task we only have to change those process settings that we want to have different from init_task, such as our process name, the cpus that are allowed, blocking all signals and setting SIGCHLD to SIG_IGN so that all of our children are reaped automatically. By being a true child of init_task we also naturally get our ppid set to 0 and do not wind up as a child of PID == 1. Ensuring that tasks generated by kthread_create will not slow down the functioning of the wait family of functions. [akpm@linux-foundation.org: use interruptible sleeps] Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
837 lines
20 KiB
C
837 lines
20 KiB
C
/*
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* linux/init/main.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* GK 2/5/95 - Changed to support mounting root fs via NFS
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* Added initrd & change_root: Werner Almesberger & Hans Lermen, Feb '96
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* Moan early if gcc is old, avoiding bogus kernels - Paul Gortmaker, May '96
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* Simplified starting of init: Michael A. Griffith <grif@acm.org>
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*/
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/proc_fs.h>
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#include <linux/kernel.h>
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#include <linux/syscalls.h>
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#include <linux/string.h>
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#include <linux/ctype.h>
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#include <linux/delay.h>
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#include <linux/utsname.h>
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#include <linux/ioport.h>
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#include <linux/init.h>
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#include <linux/smp_lock.h>
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#include <linux/initrd.h>
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#include <linux/hdreg.h>
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#include <linux/bootmem.h>
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#include <linux/tty.h>
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#include <linux/gfp.h>
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#include <linux/percpu.h>
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#include <linux/kmod.h>
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#include <linux/kernel_stat.h>
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#include <linux/start_kernel.h>
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#include <linux/security.h>
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#include <linux/workqueue.h>
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#include <linux/profile.h>
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#include <linux/rcupdate.h>
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#include <linux/moduleparam.h>
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#include <linux/kallsyms.h>
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#include <linux/writeback.h>
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#include <linux/cpu.h>
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#include <linux/cpuset.h>
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#include <linux/efi.h>
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#include <linux/tick.h>
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#include <linux/interrupt.h>
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#include <linux/taskstats_kern.h>
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#include <linux/delayacct.h>
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#include <linux/unistd.h>
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#include <linux/rmap.h>
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#include <linux/mempolicy.h>
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#include <linux/key.h>
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#include <linux/unwind.h>
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#include <linux/buffer_head.h>
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#include <linux/debug_locks.h>
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#include <linux/lockdep.h>
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#include <linux/pid_namespace.h>
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#include <linux/device.h>
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#include <linux/kthread.h>
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#include <asm/io.h>
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#include <asm/bugs.h>
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#include <asm/setup.h>
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#include <asm/sections.h>
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#include <asm/cacheflush.h>
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#ifdef CONFIG_X86_LOCAL_APIC
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#include <asm/smp.h>
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#endif
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/*
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* This is one of the first .c files built. Error out early if we have compiler
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* trouble.
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*
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* Versions of gcc older than that listed below may actually compile and link
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* okay, but the end product can have subtle run time bugs. To avoid associated
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* bogus bug reports, we flatly refuse to compile with a gcc that is known to be
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* too old from the very beginning.
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*/
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#if (__GNUC__ < 3) || (__GNUC__ == 3 && __GNUC_MINOR__ < 2)
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#error Sorry, your GCC is too old. It builds incorrect kernels.
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#endif
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#if __GNUC__ == 4 && __GNUC_MINOR__ == 1 && __GNUC_PATCHLEVEL__ == 0
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#warning gcc-4.1.0 is known to miscompile the kernel. A different compiler version is recommended.
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#endif
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static int kernel_init(void *);
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extern void init_IRQ(void);
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extern void fork_init(unsigned long);
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extern void mca_init(void);
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extern void sbus_init(void);
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extern void signals_init(void);
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extern void pidhash_init(void);
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extern void pidmap_init(void);
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extern void prio_tree_init(void);
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extern void radix_tree_init(void);
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extern void free_initmem(void);
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#ifdef CONFIG_ACPI
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extern void acpi_early_init(void);
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#else
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static inline void acpi_early_init(void) { }
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#endif
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#ifndef CONFIG_DEBUG_RODATA
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static inline void mark_rodata_ro(void) { }
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#endif
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#ifdef CONFIG_TC
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extern void tc_init(void);
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#endif
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enum system_states system_state;
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EXPORT_SYMBOL(system_state);
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/*
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* Boot command-line arguments
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*/
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#define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT
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#define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT
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extern void time_init(void);
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/* Default late time init is NULL. archs can override this later. */
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void (*late_time_init)(void);
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extern void softirq_init(void);
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/* Untouched command line saved by arch-specific code. */
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char __initdata boot_command_line[COMMAND_LINE_SIZE];
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/* Untouched saved command line (eg. for /proc) */
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char *saved_command_line;
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/* Command line for parameter parsing */
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static char *static_command_line;
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static char *execute_command;
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static char *ramdisk_execute_command;
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/* Setup configured maximum number of CPUs to activate */
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static unsigned int max_cpus = NR_CPUS;
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/*
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* If set, this is an indication to the drivers that reset the underlying
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* device before going ahead with the initialization otherwise driver might
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* rely on the BIOS and skip the reset operation.
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*
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* This is useful if kernel is booting in an unreliable environment.
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* For ex. kdump situaiton where previous kernel has crashed, BIOS has been
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* skipped and devices will be in unknown state.
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*/
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unsigned int reset_devices;
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EXPORT_SYMBOL(reset_devices);
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/*
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* Setup routine for controlling SMP activation
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*
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* Command-line option of "nosmp" or "maxcpus=0" will disable SMP
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* activation entirely (the MPS table probe still happens, though).
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*
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* Command-line option of "maxcpus=<NUM>", where <NUM> is an integer
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* greater than 0, limits the maximum number of CPUs activated in
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* SMP mode to <NUM>.
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*/
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static int __init nosmp(char *str)
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{
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max_cpus = 0;
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return 1;
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}
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__setup("nosmp", nosmp);
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static int __init maxcpus(char *str)
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{
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get_option(&str, &max_cpus);
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return 1;
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}
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__setup("maxcpus=", maxcpus);
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static int __init set_reset_devices(char *str)
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{
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reset_devices = 1;
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return 1;
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}
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__setup("reset_devices", set_reset_devices);
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static char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
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char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };
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static const char *panic_later, *panic_param;
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extern struct obs_kernel_param __setup_start[], __setup_end[];
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static int __init obsolete_checksetup(char *line)
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{
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struct obs_kernel_param *p;
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int had_early_param = 0;
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p = __setup_start;
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do {
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int n = strlen(p->str);
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if (!strncmp(line, p->str, n)) {
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if (p->early) {
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/* Already done in parse_early_param?
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* (Needs exact match on param part).
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* Keep iterating, as we can have early
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* params and __setups of same names 8( */
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if (line[n] == '\0' || line[n] == '=')
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had_early_param = 1;
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} else if (!p->setup_func) {
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printk(KERN_WARNING "Parameter %s is obsolete,"
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" ignored\n", p->str);
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return 1;
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} else if (p->setup_func(line + n))
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return 1;
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}
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p++;
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} while (p < __setup_end);
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return had_early_param;
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}
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/*
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* This should be approx 2 Bo*oMips to start (note initial shift), and will
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* still work even if initially too large, it will just take slightly longer
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*/
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unsigned long loops_per_jiffy = (1<<12);
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EXPORT_SYMBOL(loops_per_jiffy);
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static int __init debug_kernel(char *str)
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{
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if (*str)
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return 0;
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console_loglevel = 10;
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return 1;
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}
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static int __init quiet_kernel(char *str)
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{
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if (*str)
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return 0;
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console_loglevel = 4;
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return 1;
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}
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__setup("debug", debug_kernel);
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__setup("quiet", quiet_kernel);
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static int __init loglevel(char *str)
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{
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get_option(&str, &console_loglevel);
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return 1;
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}
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__setup("loglevel=", loglevel);
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/*
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* Unknown boot options get handed to init, unless they look like
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* failed parameters
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*/
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static int __init unknown_bootoption(char *param, char *val)
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{
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/* Change NUL term back to "=", to make "param" the whole string. */
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if (val) {
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/* param=val or param="val"? */
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if (val == param+strlen(param)+1)
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val[-1] = '=';
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else if (val == param+strlen(param)+2) {
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val[-2] = '=';
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memmove(val-1, val, strlen(val)+1);
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val--;
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} else
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BUG();
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}
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/* Handle obsolete-style parameters */
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if (obsolete_checksetup(param))
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return 0;
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/*
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* Preemptive maintenance for "why didn't my mispelled command
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* line work?"
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*/
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if (strchr(param, '.') && (!val || strchr(param, '.') < val)) {
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printk(KERN_ERR "Unknown boot option `%s': ignoring\n", param);
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return 0;
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}
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if (panic_later)
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return 0;
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if (val) {
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/* Environment option */
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unsigned int i;
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for (i = 0; envp_init[i]; i++) {
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if (i == MAX_INIT_ENVS) {
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panic_later = "Too many boot env vars at `%s'";
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panic_param = param;
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}
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if (!strncmp(param, envp_init[i], val - param))
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break;
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}
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envp_init[i] = param;
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} else {
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/* Command line option */
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unsigned int i;
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for (i = 0; argv_init[i]; i++) {
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if (i == MAX_INIT_ARGS) {
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panic_later = "Too many boot init vars at `%s'";
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panic_param = param;
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}
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}
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argv_init[i] = param;
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}
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return 0;
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}
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static int __init init_setup(char *str)
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{
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unsigned int i;
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execute_command = str;
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/*
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* In case LILO is going to boot us with default command line,
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* it prepends "auto" before the whole cmdline which makes
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* the shell think it should execute a script with such name.
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* So we ignore all arguments entered _before_ init=... [MJ]
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*/
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for (i = 1; i < MAX_INIT_ARGS; i++)
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argv_init[i] = NULL;
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return 1;
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}
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__setup("init=", init_setup);
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static int __init rdinit_setup(char *str)
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{
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unsigned int i;
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ramdisk_execute_command = str;
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/* See "auto" comment in init_setup */
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for (i = 1; i < MAX_INIT_ARGS; i++)
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argv_init[i] = NULL;
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return 1;
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}
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__setup("rdinit=", rdinit_setup);
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#ifndef CONFIG_SMP
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#ifdef CONFIG_X86_LOCAL_APIC
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static void __init smp_init(void)
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{
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APIC_init_uniprocessor();
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}
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#else
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#define smp_init() do { } while (0)
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#endif
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static inline void setup_per_cpu_areas(void) { }
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static inline void smp_prepare_cpus(unsigned int maxcpus) { }
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#else
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#ifdef __GENERIC_PER_CPU
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unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
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EXPORT_SYMBOL(__per_cpu_offset);
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static void __init setup_per_cpu_areas(void)
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{
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unsigned long size, i;
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char *ptr;
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unsigned long nr_possible_cpus = num_possible_cpus();
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/* Copy section for each CPU (we discard the original) */
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size = ALIGN(PERCPU_ENOUGH_ROOM, PAGE_SIZE);
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ptr = alloc_bootmem_pages(size * nr_possible_cpus);
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for_each_possible_cpu(i) {
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__per_cpu_offset[i] = ptr - __per_cpu_start;
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memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
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ptr += size;
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}
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}
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#endif /* !__GENERIC_PER_CPU */
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/* Called by boot processor to activate the rest. */
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static void __init smp_init(void)
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{
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unsigned int cpu;
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/* FIXME: This should be done in userspace --RR */
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for_each_present_cpu(cpu) {
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if (num_online_cpus() >= max_cpus)
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break;
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if (!cpu_online(cpu))
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cpu_up(cpu);
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}
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/* Any cleanup work */
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printk(KERN_INFO "Brought up %ld CPUs\n", (long)num_online_cpus());
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smp_cpus_done(max_cpus);
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}
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#endif
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/*
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* We need to store the untouched command line for future reference.
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* We also need to store the touched command line since the parameter
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* parsing is performed in place, and we should allow a component to
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* store reference of name/value for future reference.
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*/
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static void __init setup_command_line(char *command_line)
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{
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saved_command_line = alloc_bootmem(strlen (boot_command_line)+1);
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static_command_line = alloc_bootmem(strlen (command_line)+1);
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strcpy (saved_command_line, boot_command_line);
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strcpy (static_command_line, command_line);
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}
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/*
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* We need to finalize in a non-__init function or else race conditions
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* between the root thread and the init thread may cause start_kernel to
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* be reaped by free_initmem before the root thread has proceeded to
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* cpu_idle.
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*
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* gcc-3.4 accidentally inlines this function, so use noinline.
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*/
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static void noinline rest_init(void)
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__releases(kernel_lock)
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{
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int pid;
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kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND);
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numa_default_policy();
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pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES);
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kthreadd_task = find_task_by_pid(pid);
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unlock_kernel();
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/*
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* The boot idle thread must execute schedule()
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* at least one to get things moving:
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*/
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preempt_enable_no_resched();
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schedule();
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preempt_disable();
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/* Call into cpu_idle with preempt disabled */
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cpu_idle();
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}
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|
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/* Check for early params. */
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static int __init do_early_param(char *param, char *val)
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{
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struct obs_kernel_param *p;
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for (p = __setup_start; p < __setup_end; p++) {
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if (p->early && strcmp(param, p->str) == 0) {
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if (p->setup_func(val) != 0)
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printk(KERN_WARNING
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"Malformed early option '%s'\n", param);
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}
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}
|
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/* We accept everything at this stage. */
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return 0;
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}
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|
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/* Arch code calls this early on, or if not, just before other parsing. */
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void __init parse_early_param(void)
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|
{
|
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static __initdata int done = 0;
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static __initdata char tmp_cmdline[COMMAND_LINE_SIZE];
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|
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if (done)
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return;
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|
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/* All fall through to do_early_param. */
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strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
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parse_args("early options", tmp_cmdline, NULL, 0, do_early_param);
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done = 1;
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}
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|
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/*
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|
* Activate the first processor.
|
|
*/
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|
|
|
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 __attribute__((weak)) smp_setup_processor_id(void)
|
|
{
|
|
}
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|
|
|
asmlinkage void __init start_kernel(void)
|
|
{
|
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char * command_line;
|
|
extern struct kernel_param __start___param[], __stop___param[];
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|
|
|
smp_setup_processor_id();
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|
|
|
/*
|
|
* Need to run as early as possible, to initialize the
|
|
* lockdep hash:
|
|
*/
|
|
unwind_init();
|
|
lockdep_init();
|
|
|
|
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);
|
|
setup_command_line(command_line);
|
|
unwind_setup();
|
|
setup_per_cpu_areas();
|
|
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();
|
|
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 &&
|
|
initrd_start < min_low_pfn << PAGE_SHIFT) {
|
|
printk(KERN_CRIT "initrd overwritten (0x%08lx < 0x%08lx) - "
|
|
"disabling it.\n",initrd_start,min_low_pfn << PAGE_SHIFT);
|
|
initrd_start = 0;
|
|
}
|
|
#endif
|
|
vfs_caches_init_early();
|
|
cpuset_init_early();
|
|
mem_init();
|
|
kmem_cache_init();
|
|
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
|
|
fork_init(num_physpages);
|
|
proc_caches_init();
|
|
buffer_init();
|
|
unnamed_dev_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
|
|
cpuset_init();
|
|
taskstats_init_early();
|
|
delayacct_init();
|
|
|
|
check_bugs();
|
|
|
|
acpi_early_init(); /* before LAPIC and SMP init */
|
|
|
|
/* Do the rest non-__init'ed, we're now alive */
|
|
rest_init();
|
|
}
|
|
|
|
static int __initdata initcall_debug;
|
|
|
|
static int __init initcall_debug_setup(char *str)
|
|
{
|
|
initcall_debug = 1;
|
|
return 1;
|
|
}
|
|
__setup("initcall_debug", initcall_debug_setup);
|
|
|
|
extern initcall_t __initcall_start[], __initcall_end[];
|
|
|
|
static void __init do_initcalls(void)
|
|
{
|
|
initcall_t *call;
|
|
int count = preempt_count();
|
|
|
|
for (call = __initcall_start; call < __initcall_end; call++) {
|
|
ktime_t t0, t1, delta;
|
|
char *msg = NULL;
|
|
char msgbuf[40];
|
|
int result;
|
|
|
|
if (initcall_debug) {
|
|
printk("Calling initcall 0x%p", *call);
|
|
print_fn_descriptor_symbol(": %s()",
|
|
(unsigned long) *call);
|
|
printk("\n");
|
|
t0 = ktime_get();
|
|
}
|
|
|
|
result = (*call)();
|
|
|
|
if (initcall_debug) {
|
|
t1 = ktime_get();
|
|
delta = ktime_sub(t1, t0);
|
|
|
|
printk("initcall 0x%p", *call);
|
|
print_fn_descriptor_symbol(": %s()",
|
|
(unsigned long) *call);
|
|
printk(" returned %d.\n", result);
|
|
|
|
printk("initcall 0x%p ran for %Ld msecs: ",
|
|
*call, (unsigned long long)delta.tv64 >> 20);
|
|
print_fn_descriptor_symbol("%s()\n",
|
|
(unsigned long) *call);
|
|
}
|
|
|
|
if (result && result != -ENODEV && initcall_debug) {
|
|
sprintf(msgbuf, "error code %d", result);
|
|
msg = msgbuf;
|
|
}
|
|
if (preempt_count() != count) {
|
|
msg = "preemption imbalance";
|
|
preempt_count() = count;
|
|
}
|
|
if (irqs_disabled()) {
|
|
msg = "disabled interrupts";
|
|
local_irq_enable();
|
|
}
|
|
if (msg) {
|
|
printk(KERN_WARNING "initcall at 0x%p", *call);
|
|
print_fn_descriptor_symbol(": %s()",
|
|
(unsigned long) *call);
|
|
printk(": returned with %s\n", msg);
|
|
}
|
|
}
|
|
|
|
/* 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)
|
|
{
|
|
/* drivers will send hotplug events */
|
|
init_workqueues();
|
|
usermodehelper_init();
|
|
driver_init();
|
|
init_irq_proc();
|
|
do_initcalls();
|
|
}
|
|
|
|
static void __init do_pre_smp_initcalls(void)
|
|
{
|
|
extern int spawn_ksoftirqd(void);
|
|
#ifdef CONFIG_SMP
|
|
extern int migration_init(void);
|
|
|
|
migration_init();
|
|
#endif
|
|
spawn_ksoftirqd();
|
|
spawn_softlockup_task();
|
|
}
|
|
|
|
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);
|
|
|
|
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(current, CPU_MASK_ALL);
|
|
/*
|
|
* 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(max_cpus);
|
|
|
|
do_pre_smp_initcalls();
|
|
|
|
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..
|
|
*/
|
|
init_post();
|
|
return 0;
|
|
}
|