1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/init_task.h>
3 #include <linux/export.h>
4 #include <linux/mqueue.h>
5 #include <linux/sched.h>
6 #include <linux/sched/sysctl.h>
7 #include <linux/sched/rt.h>
8 #include <linux/sched/task.h>
9 #include <linux/init.h>
12 #include <linux/audit.h>
13 #include <linux/numa.h>
15 #include <asm/pgtable.h>
16 #include <linux/uaccess.h>
18 static struct signal_struct init_signals = {
20 .thread_head = LIST_HEAD_INIT(init_task.thread_node),
21 .wait_chldexit = __WAIT_QUEUE_HEAD_INITIALIZER(init_signals.wait_chldexit),
23 .list = LIST_HEAD_INIT(init_signals.shared_pending.list),
26 .multiprocess = HLIST_HEAD_INIT,
28 .cred_guard_mutex = __MUTEX_INITIALIZER(init_signals.cred_guard_mutex),
29 #ifdef CONFIG_POSIX_TIMERS
30 .posix_timers = LIST_HEAD_INIT(init_signals.posix_timers),
32 .cputime_atomic = INIT_CPUTIME_ATOMIC,
34 .checking_timer = false,
37 INIT_CPU_TIMERS(init_signals)
39 [PIDTYPE_PID] = &init_struct_pid,
40 [PIDTYPE_TGID] = &init_struct_pid,
41 [PIDTYPE_PGID] = &init_struct_pid,
42 [PIDTYPE_SID] = &init_struct_pid,
44 INIT_PREV_CPUTIME(init_signals)
47 static struct sighand_struct init_sighand = {
48 .count = REFCOUNT_INIT(1),
49 .action = { { { .sa_handler = SIG_DFL, } }, },
50 .siglock = __SPIN_LOCK_UNLOCKED(init_sighand.siglock),
51 .signalfd_wqh = __WAIT_QUEUE_HEAD_INITIALIZER(init_sighand.signalfd_wqh),
55 * Set up the first task table, touch at your own risk!. Base=0,
56 * limit=0x1fffff (=2MB)
58 struct task_struct init_task
59 #ifdef CONFIG_ARCH_TASK_STRUCT_ON_STACK
63 #ifdef CONFIG_THREAD_INFO_IN_TASK
64 .thread_info = INIT_THREAD_INFO(init_task),
65 .stack_refcount = REFCOUNT_INIT(1),
69 .usage = REFCOUNT_INIT(2),
71 .prio = MAX_PRIO - 20,
72 .static_prio = MAX_PRIO - 20,
73 .normal_prio = MAX_PRIO - 20,
74 .policy = SCHED_NORMAL,
75 .cpus_allowed = CPU_MASK_ALL,
76 .nr_cpus_allowed= NR_CPUS,
78 .active_mm = &init_mm,
80 .fn = do_no_restart_syscall,
83 .group_node = LIST_HEAD_INIT(init_task.se.group_node),
86 .run_list = LIST_HEAD_INIT(init_task.rt.run_list),
87 .time_slice = RR_TIMESLICE,
89 .tasks = LIST_HEAD_INIT(init_task.tasks),
91 .pushable_tasks = PLIST_NODE_INIT(init_task.pushable_tasks, MAX_PRIO),
93 #ifdef CONFIG_CGROUP_SCHED
94 .sched_task_group = &root_task_group,
96 .ptraced = LIST_HEAD_INIT(init_task.ptraced),
97 .ptrace_entry = LIST_HEAD_INIT(init_task.ptrace_entry),
98 .real_parent = &init_task,
100 .children = LIST_HEAD_INIT(init_task.children),
101 .sibling = LIST_HEAD_INIT(init_task.sibling),
102 .group_leader = &init_task,
103 RCU_POINTER_INITIALIZER(real_cred, &init_cred),
104 RCU_POINTER_INITIALIZER(cred, &init_cred),
105 .comm = INIT_TASK_COMM,
106 .thread = INIT_THREAD,
108 .files = &init_files,
109 .signal = &init_signals,
110 .sighand = &init_sighand,
111 .nsproxy = &init_nsproxy,
113 .list = LIST_HEAD_INIT(init_task.pending.list),
117 .alloc_lock = __SPIN_LOCK_UNLOCKED(init_task.alloc_lock),
118 .journal_info = NULL,
119 INIT_CPU_TIMERS(init_task)
120 .pi_lock = __RAW_SPIN_LOCK_UNLOCKED(init_task.pi_lock),
121 .timer_slack_ns = 50000, /* 50 usec default slack */
122 .thread_pid = &init_struct_pid,
123 .thread_group = LIST_HEAD_INIT(init_task.thread_group),
124 .thread_node = LIST_HEAD_INIT(init_signals.thread_head),
126 .loginuid = INVALID_UID,
127 .sessionid = AUDIT_SID_UNSET,
129 #ifdef CONFIG_PERF_EVENTS
130 .perf_event_mutex = __MUTEX_INITIALIZER(init_task.perf_event_mutex),
131 .perf_event_list = LIST_HEAD_INIT(init_task.perf_event_list),
133 #ifdef CONFIG_PREEMPT_RCU
134 .rcu_read_lock_nesting = 0,
135 .rcu_read_unlock_special.s = 0,
136 .rcu_node_entry = LIST_HEAD_INIT(init_task.rcu_node_entry),
137 .rcu_blocked_node = NULL,
139 #ifdef CONFIG_TASKS_RCU
140 .rcu_tasks_holdout = false,
141 .rcu_tasks_holdout_list = LIST_HEAD_INIT(init_task.rcu_tasks_holdout_list),
142 .rcu_tasks_idle_cpu = -1,
144 #ifdef CONFIG_CPUSETS
145 .mems_allowed_seq = SEQCNT_ZERO(init_task.mems_allowed_seq),
147 #ifdef CONFIG_RT_MUTEXES
148 .pi_waiters = RB_ROOT_CACHED,
151 INIT_PREV_CPUTIME(init_task)
152 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
153 .vtime.seqcount = SEQCNT_ZERO(init_task.vtime_seqcount),
154 .vtime.starttime = 0,
155 .vtime.state = VTIME_SYS,
157 #ifdef CONFIG_NUMA_BALANCING
158 .numa_preferred_nid = NUMA_NO_NODE,
165 #ifdef CONFIG_TRACE_IRQFLAGS
166 .softirqs_enabled = 1,
168 #ifdef CONFIG_LOCKDEP
169 .lockdep_recursion = 0,
171 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
174 #if defined(CONFIG_TRACING) && defined(CONFIG_PREEMPT)
175 .trace_recursion = 0,
177 #ifdef CONFIG_LIVEPATCH
178 .patch_state = KLP_UNDEFINED,
180 #ifdef CONFIG_SECURITY
184 EXPORT_SYMBOL(init_task);
187 * Initial thread structure. Alignment of this is handled by a special
190 #ifndef CONFIG_THREAD_INFO_IN_TASK
191 struct thread_info init_thread_info __init_thread_info = INIT_THREAD_INFO(init_task);