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![Linus Torvalds](/assets/img/avatar_default.png)
This reverts commit ea1e7ed337
.
Al points out that while the commit *does* actually create a separate
slab for the page->ptl allocation, that slab is never actually used, and
the code continues to use kmalloc/kfree.
Damien Wyart points out that the original patch did have the conversion
to use kmem_cache_alloc/free, so it got lost somewhere on its way to me.
Revert the half-arsed attempt that didn't do anything. If we really do
want the special slab (remember: this is all relevant just for debug
builds, so it's not necessarily all that critical) we might as well redo
the patch fully.
Reported-by: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Kirill A Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
942 lines
23 KiB
C
942 lines
23 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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#define DEBUG /* Enable initcall_debug */
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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/stackprotector.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/ioport.h>
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#include <linux/init.h>
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#include <linux/initrd.h>
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#include <linux/bootmem.h>
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#include <linux/acpi.h>
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#include <linux/tty.h>
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#include <linux/percpu.h>
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#include <linux/kmod.h>
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#include <linux/vmalloc.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/smp.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/cgroup.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/buffer_head.h>
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#include <linux/page_cgroup.h>
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#include <linux/debug_locks.h>
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#include <linux/debugobjects.h>
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#include <linux/lockdep.h>
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#include <linux/kmemleak.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 <linux/sched.h>
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#include <linux/signal.h>
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#include <linux/idr.h>
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#include <linux/kgdb.h>
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#include <linux/ftrace.h>
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#include <linux/async.h>
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#include <linux/kmemcheck.h>
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#include <linux/sfi.h>
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#include <linux/shmem_fs.h>
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#include <linux/slab.h>
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#include <linux/perf_event.h>
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#include <linux/file.h>
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#include <linux/ptrace.h>
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#include <linux/blkdev.h>
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#include <linux/elevator.h>
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#include <linux/sched_clock.h>
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#include <linux/context_tracking.h>
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#include <linux/random.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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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 radix_tree_init(void);
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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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/*
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* Debug helper: via this flag we know that we are in 'early bootup code'
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* where only the boot processor is running with IRQ disabled. This means
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* two things - IRQ must not be enabled before the flag is cleared and some
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* operations which are not allowed with IRQ disabled are allowed while the
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* flag is set.
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*/
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bool early_boot_irqs_disabled __read_mostly;
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enum system_states system_state __read_mostly;
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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 (*__initdata late_time_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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/* Command line for per-initcall parameter parsing */
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static char *initcall_command_line;
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static char *execute_command;
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static char *ramdisk_execute_command;
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/*
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* Used to generate warnings if static_key manipulation functions are used
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* before jump_label_init is called.
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*/
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bool static_key_initialized __read_mostly = false;
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EXPORT_SYMBOL_GPL(static_key_initialized);
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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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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 const char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
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const 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 const 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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const 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 (parameqn(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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pr_warn("Parameter %s is obsolete, ignored\n",
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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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console_loglevel = 10;
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return 0;
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}
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static int __init quiet_kernel(char *str)
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{
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console_loglevel = 4;
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return 0;
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}
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early_param("debug", debug_kernel);
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early_param("quiet", quiet_kernel);
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static int __init loglevel(char *str)
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{
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int newlevel;
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/*
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* Only update loglevel value when a correct setting was passed,
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* to prevent blind crashes (when loglevel being set to 0) that
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* are quite hard to debug
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*/
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if (get_option(&str, &newlevel)) {
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console_loglevel = newlevel;
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return 0;
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}
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return -EINVAL;
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}
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early_param("loglevel", loglevel);
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/* Change NUL term back to "=", to make "param" the whole string. */
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static int __init repair_env_string(char *param, char *val, const char *unused)
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{
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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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return 0;
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}
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/*
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* Unknown boot options get handed to init, unless they look like
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* unused parameters (modprobe will find them in /proc/cmdline).
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*/
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static int __init unknown_bootoption(char *param, char *val, const char *unused)
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{
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repair_env_string(param, val, unused);
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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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/* Unused module parameter. */
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if (strchr(param, '.') && (!val || strchr(param, '.') < val))
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return 0;
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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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static const unsigned int setup_max_cpus = NR_CPUS;
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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_nr_cpu_ids(void) { }
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static inline void smp_prepare_cpus(unsigned int maxcpus) { }
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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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initcall_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 __initdata DECLARE_COMPLETION(kthreadd_done);
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static noinline void __init_refok rest_init(void)
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{
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int pid;
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rcu_scheduler_starting();
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/*
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* We need to spawn init first so that it obtains pid 1, however
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* the init task will end up wanting to create kthreads, which, if
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* we schedule it before we create kthreadd, will OOPS.
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*/
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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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rcu_read_lock();
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kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns);
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rcu_read_unlock();
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complete(&kthreadd_done);
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/*
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* The boot idle thread must execute schedule()
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* at least once to get things moving:
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*/
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init_idle_bootup_task(current);
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schedule_preempt_disabled();
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/* Call into cpu_idle with preempt disabled */
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cpu_startup_entry(CPUHP_ONLINE);
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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, const char *unused)
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{
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const struct obs_kernel_param *p;
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for (p = __setup_start; p < __setup_end; p++) {
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if ((p->early && parameq(param, p->str)) ||
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(strcmp(param, "console") == 0 &&
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strcmp(p->str, "earlycon") == 0)
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) {
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if (p->setup_func(val) != 0)
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pr_warn("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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void __init parse_early_options(char *cmdline)
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{
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parse_args("early options", cmdline, NULL, 0, 0, 0, do_early_param);
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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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|
{
|
|
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_early_options(tmp_cmdline);
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done = 1;
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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)
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|
{
|
|
int cpu = smp_processor_id();
|
|
/* Mark the boot cpu "present", "online" etc for SMP and UP case */
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set_cpu_online(cpu, true);
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set_cpu_active(cpu, true);
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set_cpu_present(cpu, true);
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set_cpu_possible(cpu, true);
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|
}
|
|
|
|
void __init __weak smp_setup_processor_id(void)
|
|
{
|
|
}
|
|
|
|
# if THREAD_SIZE >= PAGE_SIZE
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|
void __init __weak thread_info_cache_init(void)
|
|
{
|
|
}
|
|
#endif
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|
|
|
/*
|
|
* Set up kernel memory allocators
|
|
*/
|
|
static void __init mm_init(void)
|
|
{
|
|
/*
|
|
* page_cgroup requires contiguous pages,
|
|
* 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[];
|
|
|
|
/*
|
|
* Need to run as early as possible, to initialize the
|
|
* lockdep hash:
|
|
*/
|
|
lockdep_init();
|
|
smp_setup_processor_id();
|
|
debug_objects_early_init();
|
|
|
|
/*
|
|
* Set up the the initial canary ASAP:
|
|
*/
|
|
boot_init_stack_canary();
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|
|
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cgroup_init_early();
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|
|
|
local_irq_disable();
|
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early_boot_irqs_disabled = true;
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|
|
|
/*
|
|
* Interrupts are still disabled. Do necessary setups, then
|
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* enable them
|
|
*/
|
|
boot_cpu_init();
|
|
page_address_init();
|
|
pr_notice("%s", linux_banner);
|
|
setup_arch(&command_line);
|
|
mm_init_owner(&init_mm, &init_task);
|
|
mm_init_cpumask(&init_mm);
|
|
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, NULL);
|
|
page_alloc_init();
|
|
|
|
pr_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,
|
|
-1, -1, &unknown_bootoption);
|
|
|
|
jump_label_init();
|
|
|
|
/*
|
|
* These use large bootmem allocations and must precede
|
|
* kmem_cache_init()
|
|
*/
|
|
setup_log_buf(0);
|
|
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 (WARN(!irqs_disabled(), "Interrupts were enabled *very* early, fixing it\n"))
|
|
local_irq_disable();
|
|
idr_init_cache();
|
|
rcu_init();
|
|
tick_nohz_init();
|
|
context_tracking_init();
|
|
radix_tree_init();
|
|
/* init some links before init_ISA_irqs() */
|
|
early_irq_init();
|
|
init_IRQ();
|
|
tick_init();
|
|
init_timers();
|
|
hrtimers_init();
|
|
softirq_init();
|
|
timekeeping_init();
|
|
time_init();
|
|
sched_clock_postinit();
|
|
perf_event_init();
|
|
profile_init();
|
|
call_function_init();
|
|
WARN(!irqs_disabled(), "Interrupts were enabled early\n");
|
|
early_boot_irqs_disabled = false;
|
|
local_irq_enable();
|
|
|
|
kmem_cache_init_late();
|
|
|
|
/*
|
|
* HACK ALERT! This is early. We're enabling the console before
|
|
* we've done PCI setups etc, and console_init() must be aware of
|
|
* this. But we do want output early, in case something goes wrong.
|
|
*/
|
|
console_init();
|
|
if (panic_later)
|
|
panic(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) {
|
|
pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n",
|
|
page_to_pfn(virt_to_page((void *)initrd_start)),
|
|
min_low_pfn);
|
|
initrd_start = 0;
|
|
}
|
|
#endif
|
|
page_cgroup_init();
|
|
debug_objects_mem_init();
|
|
kmemleak_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_RUNTIME_SERVICES))
|
|
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();
|
|
|
|
if (efi_enabled(EFI_RUNTIME_SERVICES)) {
|
|
efi_late_init();
|
|
efi_free_boot_services();
|
|
}
|
|
|
|
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
|
|
}
|
|
|
|
bool initcall_debug;
|
|
core_param(initcall_debug, initcall_debug, bool, 0644);
|
|
|
|
static int __init_or_module do_one_initcall_debug(initcall_t fn)
|
|
{
|
|
ktime_t calltime, delta, rettime;
|
|
unsigned long long duration;
|
|
int ret;
|
|
|
|
pr_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;
|
|
pr_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;
|
|
char msgbuf[64];
|
|
|
|
if (initcall_debug)
|
|
ret = do_one_initcall_debug(fn);
|
|
else
|
|
ret = fn();
|
|
|
|
msgbuf[0] = 0;
|
|
|
|
if (preempt_count() != count) {
|
|
sprintf(msgbuf, "preemption imbalance ");
|
|
preempt_count_set(count);
|
|
}
|
|
if (irqs_disabled()) {
|
|
strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf));
|
|
local_irq_enable();
|
|
}
|
|
WARN(msgbuf[0], "initcall %pF returned with %s\n", fn, msgbuf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
extern initcall_t __initcall_start[];
|
|
extern initcall_t __initcall0_start[];
|
|
extern initcall_t __initcall1_start[];
|
|
extern initcall_t __initcall2_start[];
|
|
extern initcall_t __initcall3_start[];
|
|
extern initcall_t __initcall4_start[];
|
|
extern initcall_t __initcall5_start[];
|
|
extern initcall_t __initcall6_start[];
|
|
extern initcall_t __initcall7_start[];
|
|
extern initcall_t __initcall_end[];
|
|
|
|
static initcall_t *initcall_levels[] __initdata = {
|
|
__initcall0_start,
|
|
__initcall1_start,
|
|
__initcall2_start,
|
|
__initcall3_start,
|
|
__initcall4_start,
|
|
__initcall5_start,
|
|
__initcall6_start,
|
|
__initcall7_start,
|
|
__initcall_end,
|
|
};
|
|
|
|
/* Keep these in sync with initcalls in include/linux/init.h */
|
|
static char *initcall_level_names[] __initdata = {
|
|
"early",
|
|
"core",
|
|
"postcore",
|
|
"arch",
|
|
"subsys",
|
|
"fs",
|
|
"device",
|
|
"late",
|
|
};
|
|
|
|
static void __init do_initcall_level(int level)
|
|
{
|
|
extern const struct kernel_param __start___param[], __stop___param[];
|
|
initcall_t *fn;
|
|
|
|
strcpy(initcall_command_line, saved_command_line);
|
|
parse_args(initcall_level_names[level],
|
|
initcall_command_line, __start___param,
|
|
__stop___param - __start___param,
|
|
level, level,
|
|
&repair_env_string);
|
|
|
|
for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++)
|
|
do_one_initcall(*fn);
|
|
}
|
|
|
|
static void __init do_initcalls(void)
|
|
{
|
|
int level;
|
|
|
|
for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++)
|
|
do_initcall_level(level);
|
|
}
|
|
|
|
/*
|
|
* Ok, the machine is now initialized. None of the devices
|
|
* have been touched yet, but the CPU subsystem is up and
|
|
* running, and memory and process management works.
|
|
*
|
|
* Now we can finally start doing some real work..
|
|
*/
|
|
static void __init do_basic_setup(void)
|
|
{
|
|
cpuset_init_smp();
|
|
usermodehelper_init();
|
|
shmem_init();
|
|
driver_init();
|
|
init_irq_proc();
|
|
do_ctors();
|
|
usermodehelper_enable();
|
|
do_initcalls();
|
|
random_int_secret_init();
|
|
}
|
|
|
|
static void __init do_pre_smp_initcalls(void)
|
|
{
|
|
initcall_t *fn;
|
|
|
|
for (fn = __initcall_start; fn < __initcall0_start; fn++)
|
|
do_one_initcall(*fn);
|
|
}
|
|
|
|
/*
|
|
* This function requests modules which should be loaded by default and is
|
|
* called twice right after initrd is mounted and right before init is
|
|
* exec'd. If such modules are on either initrd or rootfs, they will be
|
|
* loaded before control is passed to userland.
|
|
*/
|
|
void __init load_default_modules(void)
|
|
{
|
|
load_default_elevator_module();
|
|
}
|
|
|
|
static int run_init_process(const char *init_filename)
|
|
{
|
|
argv_init[0] = init_filename;
|
|
return do_execve(init_filename,
|
|
(const char __user *const __user *)argv_init,
|
|
(const char __user *const __user *)envp_init);
|
|
}
|
|
|
|
static int try_to_run_init_process(const char *init_filename)
|
|
{
|
|
int ret;
|
|
|
|
ret = run_init_process(init_filename);
|
|
|
|
if (ret && ret != -ENOENT) {
|
|
pr_err("Starting init: %s exists but couldn't execute it (error %d)\n",
|
|
init_filename, ret);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static noinline void __init kernel_init_freeable(void);
|
|
|
|
static int __ref kernel_init(void *unused)
|
|
{
|
|
int ret;
|
|
|
|
kernel_init_freeable();
|
|
/* need to finish all async __init code before freeing the memory */
|
|
async_synchronize_full();
|
|
free_initmem();
|
|
mark_rodata_ro();
|
|
system_state = SYSTEM_RUNNING;
|
|
numa_default_policy();
|
|
|
|
flush_delayed_fput();
|
|
|
|
if (ramdisk_execute_command) {
|
|
ret = run_init_process(ramdisk_execute_command);
|
|
if (!ret)
|
|
return 0;
|
|
pr_err("Failed to execute %s (error %d)\n",
|
|
ramdisk_execute_command, ret);
|
|
}
|
|
|
|
/*
|
|
* We try each of these until one succeeds.
|
|
*
|
|
* The Bourne shell can be used instead of init if we are
|
|
* trying to recover a really broken machine.
|
|
*/
|
|
if (execute_command) {
|
|
ret = run_init_process(execute_command);
|
|
if (!ret)
|
|
return 0;
|
|
pr_err("Failed to execute %s (error %d). Attempting defaults...\n",
|
|
execute_command, ret);
|
|
}
|
|
if (!try_to_run_init_process("/sbin/init") ||
|
|
!try_to_run_init_process("/etc/init") ||
|
|
!try_to_run_init_process("/bin/init") ||
|
|
!try_to_run_init_process("/bin/sh"))
|
|
return 0;
|
|
|
|
panic("No working init found. Try passing init= option to kernel. "
|
|
"See Linux Documentation/init.txt for guidance.");
|
|
}
|
|
|
|
static noinline void __init kernel_init_freeable(void)
|
|
{
|
|
/*
|
|
* Wait until kthreadd is all set-up.
|
|
*/
|
|
wait_for_completion(&kthreadd_done);
|
|
|
|
/* Now the scheduler is fully set up and can do blocking allocations */
|
|
gfp_allowed_mask = __GFP_BITS_MASK;
|
|
|
|
/*
|
|
* init can allocate pages on any node
|
|
*/
|
|
set_mems_allowed(node_states[N_MEMORY]);
|
|
/*
|
|
* init can run on any cpu.
|
|
*/
|
|
set_cpus_allowed_ptr(current, cpu_all_mask);
|
|
|
|
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)
|
|
pr_err("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..
|
|
*/
|
|
|
|
/* rootfs is available now, try loading default modules */
|
|
load_default_modules();
|
|
}
|