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_ptr
= &init_task
.cpus_mask
,
76 .cpus_mask
= CPU_MASK_ALL
,
77 .nr_cpus_allowed
= NR_CPUS
,
79 .active_mm
= &init_mm
,
81 .fn
= do_no_restart_syscall
,
84 .group_node
= LIST_HEAD_INIT(init_task
.se
.group_node
),
87 .run_list
= LIST_HEAD_INIT(init_task
.rt
.run_list
),
88 .time_slice
= RR_TIMESLICE
,
90 .tasks
= LIST_HEAD_INIT(init_task
.tasks
),
92 .pushable_tasks
= PLIST_NODE_INIT(init_task
.pushable_tasks
, MAX_PRIO
),
94 #ifdef CONFIG_CGROUP_SCHED
95 .sched_task_group
= &root_task_group
,
97 .ptraced
= LIST_HEAD_INIT(init_task
.ptraced
),
98 .ptrace_entry
= LIST_HEAD_INIT(init_task
.ptrace_entry
),
99 .real_parent
= &init_task
,
100 .parent
= &init_task
,
101 .children
= LIST_HEAD_INIT(init_task
.children
),
102 .sibling
= LIST_HEAD_INIT(init_task
.sibling
),
103 .group_leader
= &init_task
,
104 RCU_POINTER_INITIALIZER(real_cred
, &init_cred
),
105 RCU_POINTER_INITIALIZER(cred
, &init_cred
),
106 .comm
= INIT_TASK_COMM
,
107 .thread
= INIT_THREAD
,
109 .files
= &init_files
,
110 .signal
= &init_signals
,
111 .sighand
= &init_sighand
,
112 .nsproxy
= &init_nsproxy
,
114 .list
= LIST_HEAD_INIT(init_task
.pending
.list
),
118 .alloc_lock
= __SPIN_LOCK_UNLOCKED(init_task
.alloc_lock
),
119 .journal_info
= NULL
,
120 INIT_CPU_TIMERS(init_task
)
121 .pi_lock
= __RAW_SPIN_LOCK_UNLOCKED(init_task
.pi_lock
),
122 .timer_slack_ns
= 50000, /* 50 usec default slack */
123 .thread_pid
= &init_struct_pid
,
124 .thread_group
= LIST_HEAD_INIT(init_task
.thread_group
),
125 .thread_node
= LIST_HEAD_INIT(init_signals
.thread_head
),
127 .loginuid
= INVALID_UID
,
128 .sessionid
= AUDIT_SID_UNSET
,
130 #ifdef CONFIG_PERF_EVENTS
131 .perf_event_mutex
= __MUTEX_INITIALIZER(init_task
.perf_event_mutex
),
132 .perf_event_list
= LIST_HEAD_INIT(init_task
.perf_event_list
),
134 #ifdef CONFIG_PREEMPT_RCU
135 .rcu_read_lock_nesting
= 0,
136 .rcu_read_unlock_special
.s
= 0,
137 .rcu_node_entry
= LIST_HEAD_INIT(init_task
.rcu_node_entry
),
138 .rcu_blocked_node
= NULL
,
140 #ifdef CONFIG_TASKS_RCU
141 .rcu_tasks_holdout
= false,
142 .rcu_tasks_holdout_list
= LIST_HEAD_INIT(init_task
.rcu_tasks_holdout_list
),
143 .rcu_tasks_idle_cpu
= -1,
145 #ifdef CONFIG_CPUSETS
146 .mems_allowed_seq
= SEQCNT_ZERO(init_task
.mems_allowed_seq
),
148 #ifdef CONFIG_RT_MUTEXES
149 .pi_waiters
= RB_ROOT_CACHED
,
152 INIT_PREV_CPUTIME(init_task
)
153 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
154 .vtime
.seqcount
= SEQCNT_ZERO(init_task
.vtime_seqcount
),
155 .vtime
.starttime
= 0,
156 .vtime
.state
= VTIME_SYS
,
158 #ifdef CONFIG_NUMA_BALANCING
159 .numa_preferred_nid
= NUMA_NO_NODE
,
166 #ifdef CONFIG_TRACE_IRQFLAGS
167 .softirqs_enabled
= 1,
169 #ifdef CONFIG_LOCKDEP
170 .lockdep_depth
= 0, /* no locks held yet */
171 .curr_chain_key
= INITIAL_CHAIN_KEY
,
172 .lockdep_recursion
= 0,
174 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
177 #if defined(CONFIG_TRACING) && defined(CONFIG_PREEMPT)
178 .trace_recursion
= 0,
180 #ifdef CONFIG_LIVEPATCH
181 .patch_state
= KLP_UNDEFINED
,
183 #ifdef CONFIG_SECURITY
187 EXPORT_SYMBOL(init_task
);
190 * Initial thread structure. Alignment of this is handled by a special
193 #ifndef CONFIG_THREAD_INFO_IN_TASK
194 struct thread_info init_thread_info __init_thread_info
= INIT_THREAD_INFO(init_task
);