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>
14 #include <linux/scs.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 .exec_update_mutex
= __MUTEX_INITIALIZER(init_signals
.exec_update_mutex
),
30 #ifdef CONFIG_POSIX_TIMERS
31 .posix_timers
= LIST_HEAD_INIT(init_signals
.posix_timers
),
33 .cputime_atomic
= INIT_CPUTIME_ATOMIC
,
36 INIT_CPU_TIMERS(init_signals
)
38 [PIDTYPE_PID
] = &init_struct_pid
,
39 [PIDTYPE_TGID
] = &init_struct_pid
,
40 [PIDTYPE_PGID
] = &init_struct_pid
,
41 [PIDTYPE_SID
] = &init_struct_pid
,
43 INIT_PREV_CPUTIME(init_signals
)
46 static struct sighand_struct init_sighand
= {
47 .count
= REFCOUNT_INIT(1),
48 .action
= { { { .sa_handler
= SIG_DFL
, } }, },
49 .siglock
= __SPIN_LOCK_UNLOCKED(init_sighand
.siglock
),
50 .signalfd_wqh
= __WAIT_QUEUE_HEAD_INITIALIZER(init_sighand
.signalfd_wqh
),
53 #ifdef CONFIG_SHADOW_CALL_STACK
54 unsigned long init_shadow_call_stack
[SCS_SIZE
/ sizeof(long)]
56 [(SCS_SIZE
/ sizeof(long)) - 1] = SCS_END_MAGIC
61 * Set up the first task table, touch at your own risk!. Base=0,
62 * limit=0x1fffff (=2MB)
64 struct task_struct init_task
65 #ifdef CONFIG_ARCH_TASK_STRUCT_ON_STACK
69 #ifdef CONFIG_THREAD_INFO_IN_TASK
70 .thread_info
= INIT_THREAD_INFO(init_task
),
71 .stack_refcount
= REFCOUNT_INIT(1),
75 .usage
= REFCOUNT_INIT(2),
77 .prio
= MAX_PRIO
- 20,
78 .static_prio
= MAX_PRIO
- 20,
79 .normal_prio
= MAX_PRIO
- 20,
80 .policy
= SCHED_NORMAL
,
81 .cpus_ptr
= &init_task
.cpus_mask
,
82 .cpus_mask
= CPU_MASK_ALL
,
83 .nr_cpus_allowed
= NR_CPUS
,
85 .active_mm
= &init_mm
,
87 .fn
= do_no_restart_syscall
,
90 .group_node
= LIST_HEAD_INIT(init_task
.se
.group_node
),
93 .run_list
= LIST_HEAD_INIT(init_task
.rt
.run_list
),
94 .time_slice
= RR_TIMESLICE
,
96 .tasks
= LIST_HEAD_INIT(init_task
.tasks
),
98 .pushable_tasks
= PLIST_NODE_INIT(init_task
.pushable_tasks
, MAX_PRIO
),
100 #ifdef CONFIG_CGROUP_SCHED
101 .sched_task_group
= &root_task_group
,
103 .ptraced
= LIST_HEAD_INIT(init_task
.ptraced
),
104 .ptrace_entry
= LIST_HEAD_INIT(init_task
.ptrace_entry
),
105 .real_parent
= &init_task
,
106 .parent
= &init_task
,
107 .children
= LIST_HEAD_INIT(init_task
.children
),
108 .sibling
= LIST_HEAD_INIT(init_task
.sibling
),
109 .group_leader
= &init_task
,
110 RCU_POINTER_INITIALIZER(real_cred
, &init_cred
),
111 RCU_POINTER_INITIALIZER(cred
, &init_cred
),
112 .comm
= INIT_TASK_COMM
,
113 .thread
= INIT_THREAD
,
115 .files
= &init_files
,
116 .signal
= &init_signals
,
117 .sighand
= &init_sighand
,
118 .nsproxy
= &init_nsproxy
,
120 .list
= LIST_HEAD_INIT(init_task
.pending
.list
),
124 .alloc_lock
= __SPIN_LOCK_UNLOCKED(init_task
.alloc_lock
),
125 .journal_info
= NULL
,
126 INIT_CPU_TIMERS(init_task
)
127 .pi_lock
= __RAW_SPIN_LOCK_UNLOCKED(init_task
.pi_lock
),
128 .timer_slack_ns
= 50000, /* 50 usec default slack */
129 .thread_pid
= &init_struct_pid
,
130 .thread_group
= LIST_HEAD_INIT(init_task
.thread_group
),
131 .thread_node
= LIST_HEAD_INIT(init_signals
.thread_head
),
133 .loginuid
= INVALID_UID
,
134 .sessionid
= AUDIT_SID_UNSET
,
136 #ifdef CONFIG_PERF_EVENTS
137 .perf_event_mutex
= __MUTEX_INITIALIZER(init_task
.perf_event_mutex
),
138 .perf_event_list
= LIST_HEAD_INIT(init_task
.perf_event_list
),
140 #ifdef CONFIG_PREEMPT_RCU
141 .rcu_read_lock_nesting
= 0,
142 .rcu_read_unlock_special
.s
= 0,
143 .rcu_node_entry
= LIST_HEAD_INIT(init_task
.rcu_node_entry
),
144 .rcu_blocked_node
= NULL
,
146 #ifdef CONFIG_TASKS_RCU
147 .rcu_tasks_holdout
= false,
148 .rcu_tasks_holdout_list
= LIST_HEAD_INIT(init_task
.rcu_tasks_holdout_list
),
149 .rcu_tasks_idle_cpu
= -1,
151 #ifdef CONFIG_TASKS_TRACE_RCU
152 .trc_reader_nesting
= 0,
153 .trc_reader_special
.s
= 0,
154 .trc_holdout_list
= LIST_HEAD_INIT(init_task
.trc_holdout_list
),
156 #ifdef CONFIG_CPUSETS
157 .mems_allowed_seq
= SEQCNT_ZERO(init_task
.mems_allowed_seq
),
159 #ifdef CONFIG_RT_MUTEXES
160 .pi_waiters
= RB_ROOT_CACHED
,
163 INIT_PREV_CPUTIME(init_task
)
164 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
165 .vtime
.seqcount
= SEQCNT_ZERO(init_task
.vtime_seqcount
),
166 .vtime
.starttime
= 0,
167 .vtime
.state
= VTIME_SYS
,
169 #ifdef CONFIG_NUMA_BALANCING
170 .numa_preferred_nid
= NUMA_NO_NODE
,
181 .atomic_nest_count
= 0,
182 .in_flat_atomic
= false,
184 .scoped_accesses
= {LIST_POISON1
, NULL
},
187 #ifdef CONFIG_TRACE_IRQFLAGS
188 .softirqs_enabled
= 1,
190 #ifdef CONFIG_LOCKDEP
191 .lockdep_depth
= 0, /* no locks held yet */
192 .curr_chain_key
= INITIAL_CHAIN_KEY
,
193 .lockdep_recursion
= 0,
195 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
198 #if defined(CONFIG_TRACING) && defined(CONFIG_PREEMPTION)
199 .trace_recursion
= 0,
201 #ifdef CONFIG_LIVEPATCH
202 .patch_state
= KLP_UNDEFINED
,
204 #ifdef CONFIG_SECURITY
207 #ifdef CONFIG_SECCOMP
208 .seccomp
= { .filter_count
= ATOMIC_INIT(0) },
211 EXPORT_SYMBOL(init_task
);
214 * Initial thread structure. Alignment of this is handled by a special
217 #ifndef CONFIG_THREAD_INFO_IN_TASK
218 struct thread_info init_thread_info __init_thread_info
= INIT_THREAD_INFO(init_task
);