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_lock
= __RWSEM_INITIALIZER(init_signals
.exec_update_lock
),
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
68 __aligned(L1_CACHE_BYTES
)
70 #ifdef CONFIG_THREAD_INFO_IN_TASK
71 .thread_info
= INIT_THREAD_INFO(init_task
),
72 .stack_refcount
= REFCOUNT_INIT(1),
76 .usage
= REFCOUNT_INIT(2),
78 .prio
= MAX_PRIO
- 20,
79 .static_prio
= MAX_PRIO
- 20,
80 .normal_prio
= MAX_PRIO
- 20,
81 .policy
= SCHED_NORMAL
,
82 .cpus_ptr
= &init_task
.cpus_mask
,
83 .user_cpus_ptr
= NULL
,
84 .cpus_mask
= CPU_MASK_ALL
,
85 .nr_cpus_allowed
= NR_CPUS
,
87 .active_mm
= &init_mm
,
88 .faults_disabled_mapping
= NULL
,
90 .fn
= do_no_restart_syscall
,
93 .group_node
= LIST_HEAD_INIT(init_task
.se
.group_node
),
96 .run_list
= LIST_HEAD_INIT(init_task
.rt
.run_list
),
97 .time_slice
= RR_TIMESLICE
,
99 .tasks
= LIST_HEAD_INIT(init_task
.tasks
),
101 .pushable_tasks
= PLIST_NODE_INIT(init_task
.pushable_tasks
, MAX_PRIO
),
103 #ifdef CONFIG_CGROUP_SCHED
104 .sched_task_group
= &root_task_group
,
106 .ptraced
= LIST_HEAD_INIT(init_task
.ptraced
),
107 .ptrace_entry
= LIST_HEAD_INIT(init_task
.ptrace_entry
),
108 .real_parent
= &init_task
,
109 .parent
= &init_task
,
110 .children
= LIST_HEAD_INIT(init_task
.children
),
111 .sibling
= LIST_HEAD_INIT(init_task
.sibling
),
112 .group_leader
= &init_task
,
113 RCU_POINTER_INITIALIZER(real_cred
, &init_cred
),
114 RCU_POINTER_INITIALIZER(cred
, &init_cred
),
115 .comm
= INIT_TASK_COMM
,
116 .thread
= INIT_THREAD
,
118 .files
= &init_files
,
119 #ifdef CONFIG_IO_URING
122 .signal
= &init_signals
,
123 .sighand
= &init_sighand
,
124 .nsproxy
= &init_nsproxy
,
126 .list
= LIST_HEAD_INIT(init_task
.pending
.list
),
130 .alloc_lock
= __SPIN_LOCK_UNLOCKED(init_task
.alloc_lock
),
131 .journal_info
= NULL
,
132 INIT_CPU_TIMERS(init_task
)
133 .pi_lock
= __RAW_SPIN_LOCK_UNLOCKED(init_task
.pi_lock
),
134 .timer_slack_ns
= 50000, /* 50 usec default slack */
135 .thread_pid
= &init_struct_pid
,
136 .thread_group
= LIST_HEAD_INIT(init_task
.thread_group
),
137 .thread_node
= LIST_HEAD_INIT(init_signals
.thread_head
),
139 .loginuid
= INVALID_UID
,
140 .sessionid
= AUDIT_SID_UNSET
,
142 #ifdef CONFIG_PERF_EVENTS
143 .perf_event_mutex
= __MUTEX_INITIALIZER(init_task
.perf_event_mutex
),
144 .perf_event_list
= LIST_HEAD_INIT(init_task
.perf_event_list
),
146 #ifdef CONFIG_PREEMPT_RCU
147 .rcu_read_lock_nesting
= 0,
148 .rcu_read_unlock_special
.s
= 0,
149 .rcu_node_entry
= LIST_HEAD_INIT(init_task
.rcu_node_entry
),
150 .rcu_blocked_node
= NULL
,
152 #ifdef CONFIG_TASKS_RCU
153 .rcu_tasks_holdout
= false,
154 .rcu_tasks_holdout_list
= LIST_HEAD_INIT(init_task
.rcu_tasks_holdout_list
),
155 .rcu_tasks_idle_cpu
= -1,
157 #ifdef CONFIG_TASKS_TRACE_RCU
158 .trc_reader_nesting
= 0,
159 .trc_reader_special
.s
= 0,
160 .trc_holdout_list
= LIST_HEAD_INIT(init_task
.trc_holdout_list
),
161 .trc_blkd_node
= LIST_HEAD_INIT(init_task
.trc_blkd_node
),
163 #ifdef CONFIG_CPUSETS
164 .mems_allowed_seq
= SEQCNT_SPINLOCK_ZERO(init_task
.mems_allowed_seq
,
165 &init_task
.alloc_lock
),
167 #ifdef CONFIG_RT_MUTEXES
168 .pi_waiters
= RB_ROOT_CACHED
,
171 INIT_PREV_CPUTIME(init_task
)
172 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
173 .vtime
.seqcount
= SEQCNT_ZERO(init_task
.vtime_seqcount
),
174 .vtime
.starttime
= 0,
175 .vtime
.state
= VTIME_SYS
,
177 #ifdef CONFIG_NUMA_BALANCING
178 .numa_preferred_nid
= NUMA_NO_NODE
,
182 #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
187 .scoped_accesses
= {LIST_POISON1
, NULL
},
190 #ifdef CONFIG_TRACE_IRQFLAGS
191 .softirqs_enabled
= 1,
193 #ifdef CONFIG_LOCKDEP
194 .lockdep_depth
= 0, /* no locks held yet */
195 .curr_chain_key
= INITIAL_CHAIN_KEY
,
196 .lockdep_recursion
= 0,
198 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
200 .tracing_graph_pause
= ATOMIC_INIT(0),
202 #if defined(CONFIG_TRACING) && defined(CONFIG_PREEMPTION)
203 .trace_recursion
= 0,
205 #ifdef CONFIG_LIVEPATCH
206 .patch_state
= KLP_UNDEFINED
,
208 #ifdef CONFIG_SECURITY
211 #ifdef CONFIG_SECCOMP_FILTER
212 .seccomp
= { .filter_count
= ATOMIC_INIT(0) },
215 EXPORT_SYMBOL(init_task
);
218 * Initial thread structure. Alignment of this is handled by a special
221 #ifndef CONFIG_THREAD_INFO_IN_TASK
222 struct thread_info init_thread_info __init_thread_info
= INIT_THREAD_INFO(init_task
);