* Simplified starting of init: Michael A. Griffith <grif@acm.org>
*/
-#define __KERNEL_SYSCALLS__
-
-#include <linux/config.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
-#include <linux/devfs_fs_kernel.h>
#include <linux/kernel.h>
#include <linux/syscalls.h>
#include <linux/string.h>
#include <linux/percpu.h>
#include <linux/kmod.h>
#include <linux/kernel_stat.h>
+#include <linux/start_kernel.h>
#include <linux/security.h>
#include <linux/workqueue.h>
#include <linux/profile.h>
#include <linux/cpu.h>
#include <linux/cpuset.h>
#include <linux/efi.h>
+#include <linux/taskstats_kern.h>
+#include <linux/delayacct.h>
#include <linux/unistd.h>
#include <linux/rmap.h>
#include <linux/mempolicy.h>
#include <linux/key.h>
+#include <linux/unwind.h>
+#include <linux/buffer_head.h>
+#include <linux/debug_locks.h>
+#include <linux/lockdep.h>
+#include <linux/pid_namespace.h>
+#include <linux/device.h>
#include <asm/io.h>
#include <asm/bugs.h>
#error Sorry, your GCC is too old. It builds incorrect kernels.
#endif
+#if __GNUC__ == 4 && __GNUC_MINOR__ == 1 && __GNUC_PATCHLEVEL__ == 0
+#warning gcc-4.1.0 is known to miscompile the kernel. A different compiler version is recommended.
+#endif
+
static int init(void *);
extern void init_IRQ(void);
extern void sbus_init(void);
extern void sysctl_init(void);
extern void signals_init(void);
-extern void buffer_init(void);
extern void pidhash_init(void);
extern void pidmap_init(void);
extern void prio_tree_init(void);
extern void radix_tree_init(void);
extern void free_initmem(void);
-extern void populate_rootfs(void);
-extern void driver_init(void);
extern void prepare_namespace(void);
#ifdef CONFIG_ACPI
extern void acpi_early_init(void);
static unsigned int max_cpus = NR_CPUS;
/*
+ * 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);
+
+/*
* Setup routine for controlling SMP activation
*
* Command-line option of "nosmp" or "maxcpus=0" will disable SMP
__setup("maxcpus=", maxcpus);
+static int __init set_reset_devices(char *str)
+{
+ reset_devices = 1;
+ return 1;
+}
+
+__setup("reset_devices", set_reset_devices);
+
static char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };
static const char *panic_later, *panic_param;
static int __init obsolete_checksetup(char *line)
{
struct obs_kernel_param *p;
+ int had_early_param = 0;
p = __setup_start;
do {
int n = strlen(p->str);
if (!strncmp(line, p->str, n)) {
if (p->early) {
- /* Already done in parse_early_param? (Needs
- * exact match on param part) */
+ /* 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] == '=')
- return 1;
+ had_early_param = 1;
} else if (!p->setup_func) {
printk(KERN_WARNING "Parameter %s is obsolete,"
" ignored\n", p->str);
}
p++;
} while (p < __setup_end);
- return 0;
+
+ return had_early_param;
}
/*
}
__setup("rdinit=", rdinit_setup);
-extern void setup_arch(char **);
-
#ifndef CONFIG_SMP
#ifdef CONFIG_X86_LOCAL_APIC
#endif
ptr = alloc_bootmem(size * nr_possible_cpus);
- for_each_cpu(i) {
+ for_each_possible_cpu(i) {
__per_cpu_offset[i] = ptr - __per_cpu_start;
memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
ptr += size;
cpu_set(cpu, cpu_possible_map);
}
+void __init __attribute__((weak)) smp_setup_processor_id(void)
+{
+}
+
asmlinkage void __init start_kernel(void)
{
char * command_line;
extern struct kernel_param __start___param[], __stop___param[];
+
+ smp_setup_processor_id();
+
+ /*
+ * Need to run as early as possible, to initialize the
+ * lockdep hash:
+ */
+ unwind_init();
+ lockdep_init();
+
+ local_irq_disable();
+ early_boot_irqs_off();
+ early_init_irq_lock_class();
+
/*
* Interrupts are still disabled. Do necessary setups, then
* enable them
printk(KERN_NOTICE);
printk(linux_banner);
setup_arch(&command_line);
+ unwind_setup();
setup_per_cpu_areas();
smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */
parse_args("Booting kernel", 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_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
console_init();
if (panic_later)
panic(panic_later, panic_param);
- profile_init();
- local_irq_enable();
+
+ 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) {
proc_root_init();
#endif
cpuset_init();
+ taskstats_init_early();
+ delayacct_init();
check_bugs();
}
__setup("initcall_debug", initcall_debug_setup);
-struct task_struct *child_reaper = &init_task;
-
extern initcall_t __initcall_start[], __initcall_end[];
static void __init do_initcalls(void)
int count = preempt_count();
for (call = __initcall_start; call < __initcall_end; call++) {
- char *msg;
+ char *msg = NULL;
+ char msgbuf[40];
+ int result;
if (initcall_debug) {
- printk(KERN_DEBUG "Calling initcall 0x%p", *call);
- print_fn_descriptor_symbol(": %s()", (unsigned long) *call);
+ printk("Calling initcall 0x%p", *call);
+ print_fn_descriptor_symbol(": %s()",
+ (unsigned long) *call);
printk("\n");
}
- (*call)();
+ result = (*call)();
- msg = NULL;
+ if (result && result != -ENODEV && initcall_debug) {
+ sprintf(msgbuf, "error code %d", result);
+ msg = msgbuf;
+ }
if (preempt_count() != count) {
msg = "preemption imbalance";
preempt_count() = count;
local_irq_enable();
}
if (msg) {
- printk(KERN_WARNING "error in initcall at 0x%p: "
- "returned with %s\n", *call, msg);
+ printk(KERN_WARNING "initcall at 0x%p", *call);
+ print_fn_descriptor_symbol(": %s()",
+ (unsigned long) *call);
+ printk(": returned with %s\n", msg);
}
}
do_initcalls();
}
-static void do_pre_smp_initcalls(void)
+static void __init do_pre_smp_initcalls(void)
{
extern int spawn_ksoftirqd(void);
#ifdef CONFIG_SMP
static void run_init_process(char *init_filename)
{
argv_init[0] = init_filename;
- execve(init_filename, argv_init, envp_init);
-}
-
-static inline void fixup_cpu_present_map(void)
-{
-#ifdef CONFIG_SMP
- int i;
-
- /*
- * If arch is not hotplug ready and did not populate
- * cpu_present_map, just make cpu_present_map same as cpu_possible_map
- * for other cpu bringup code to function as normal. e.g smp_init() etc.
- */
- if (cpus_empty(cpu_present_map)) {
- for_each_cpu(i) {
- cpu_set(i, cpu_present_map);
- }
- }
-#endif
+ kernel_execve(init_filename, argv_init, envp_init);
}
static int init(void * unused)
* assumptions about where in the task array this
* can be found.
*/
- child_reaper = current;
+ init_pid_ns.child_reaper = current;
+
+ cad_pid = task_pid(current);
smp_prepare_cpus(max_cpus);
do_pre_smp_initcalls();
- fixup_cpu_present_map();
smp_init();
sched_init_smp();
cpuset_init_smp();
- /*
- * Do this before initcalls, because some drivers want to access
- * firmware files.
- */
- populate_rootfs();
-
do_basic_setup();
/*
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff