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/sched/ext.h>
10#include <linux/init.h>
11#include <linux/fs.h>
12#include <linux/mm.h>
13#include <linux/audit.h>
14#include <linux/numa.h>
15#include <linux/scs.h>
16#include <linux/plist.h>
17
18#include <linux/uaccess.h>
19
20static struct signal_struct init_signals = {
21 .nr_threads = 1,
22 .thread_head = LIST_HEAD_INIT(init_task.thread_node),
23 .wait_chldexit = __WAIT_QUEUE_HEAD_INITIALIZER(init_signals.wait_chldexit),
24 .shared_pending = {
25 .list = LIST_HEAD_INIT(init_signals.shared_pending.list),
26 .signal = {{0}}
27 },
28 .multiprocess = HLIST_HEAD_INIT,
29 .rlim = INIT_RLIMITS,
30 .cred_guard_mutex = __MUTEX_INITIALIZER(init_signals.cred_guard_mutex),
31 .exec_update_lock = __RWSEM_INITIALIZER(init_signals.exec_update_lock),
32#ifdef CONFIG_POSIX_TIMERS
33 .posix_timers = HLIST_HEAD_INIT,
34 .ignored_posix_timers = HLIST_HEAD_INIT,
35 .cputimer = {
36 .cputime_atomic = INIT_CPUTIME_ATOMIC,
37 },
38#endif
39 INIT_CPU_TIMERS(init_signals)
40 .pids = {
41 [PIDTYPE_PID] = &init_struct_pid,
42 [PIDTYPE_TGID] = &init_struct_pid,
43 [PIDTYPE_PGID] = &init_struct_pid,
44 [PIDTYPE_SID] = &init_struct_pid,
45 },
46 INIT_PREV_CPUTIME(init_signals)
47};
48
49static struct sighand_struct init_sighand = {
50 .count = REFCOUNT_INIT(1),
51 .action = { { { .sa_handler = SIG_DFL, } }, },
52 .siglock = __SPIN_LOCK_UNLOCKED(init_sighand.siglock),
53 .signalfd_wqh = __WAIT_QUEUE_HEAD_INITIALIZER(init_sighand.signalfd_wqh),
54};
55
56#ifdef CONFIG_SHADOW_CALL_STACK
57unsigned long init_shadow_call_stack[SCS_SIZE / sizeof(long)] = {
58 [(SCS_SIZE / sizeof(long)) - 1] = SCS_END_MAGIC
59};
60#endif
61
62/*
63 * Set up the first task table, touch at your own risk!. Base=0,
64 * limit=0x1fffff (=2MB)
65 */
66struct task_struct init_task __aligned(L1_CACHE_BYTES) = {
67#ifdef CONFIG_THREAD_INFO_IN_TASK
68 .thread_info = INIT_THREAD_INFO(init_task),
69 .stack_refcount = REFCOUNT_INIT(1),
70#endif
71 .__state = 0,
72 .stack = init_stack,
73 .usage = REFCOUNT_INIT(2),
74 .flags = PF_KTHREAD,
75 .prio = MAX_PRIO - 20,
76 .static_prio = MAX_PRIO - 20,
77 .normal_prio = MAX_PRIO - 20,
78 .policy = SCHED_NORMAL,
79 .cpus_ptr = &init_task.cpus_mask,
80 .user_cpus_ptr = NULL,
81 .cpus_mask = CPU_MASK_ALL,
82 .max_allowed_capacity = SCHED_CAPACITY_SCALE,
83 .nr_cpus_allowed= NR_CPUS,
84 .mm = NULL,
85 .active_mm = &init_mm,
86 .faults_disabled_mapping = NULL,
87 .restart_block = {
88 .fn = do_no_restart_syscall,
89 },
90 .se = {
91 .group_node = LIST_HEAD_INIT(init_task.se.group_node),
92 },
93 .rt = {
94 .run_list = LIST_HEAD_INIT(init_task.rt.run_list),
95 .time_slice = RR_TIMESLICE,
96 },
97 .tasks = LIST_HEAD_INIT(init_task.tasks),
98#ifdef CONFIG_SMP
99 .pushable_tasks = PLIST_NODE_INIT(init_task.pushable_tasks, MAX_PRIO),
100#endif
101#ifdef CONFIG_CGROUP_SCHED
102 .sched_task_group = &root_task_group,
103#endif
104#ifdef CONFIG_SCHED_CLASS_EXT
105 .scx = {
106 .dsq_list.node = LIST_HEAD_INIT(init_task.scx.dsq_list.node),
107 .sticky_cpu = -1,
108 .holding_cpu = -1,
109 .runnable_node = LIST_HEAD_INIT(init_task.scx.runnable_node),
110 .runnable_at = INITIAL_JIFFIES,
111 .ddsp_dsq_id = SCX_DSQ_INVALID,
112 .slice = SCX_SLICE_DFL,
113 },
114#endif
115 .ptraced = LIST_HEAD_INIT(init_task.ptraced),
116 .ptrace_entry = LIST_HEAD_INIT(init_task.ptrace_entry),
117 .real_parent = &init_task,
118 .parent = &init_task,
119 .children = LIST_HEAD_INIT(init_task.children),
120 .sibling = LIST_HEAD_INIT(init_task.sibling),
121 .group_leader = &init_task,
122 RCU_POINTER_INITIALIZER(real_cred, &init_cred),
123 RCU_POINTER_INITIALIZER(cred, &init_cred),
124 .comm = INIT_TASK_COMM,
125 .thread = INIT_THREAD,
126 .fs = &init_fs,
127 .files = &init_files,
128#ifdef CONFIG_IO_URING
129 .io_uring = NULL,
130#endif
131 .signal = &init_signals,
132 .sighand = &init_sighand,
133 .nsproxy = &init_nsproxy,
134 .pending = {
135 .list = LIST_HEAD_INIT(init_task.pending.list),
136 .signal = {{0}}
137 },
138 .blocked = {{0}},
139 .alloc_lock = __SPIN_LOCK_UNLOCKED(init_task.alloc_lock),
140 .journal_info = NULL,
141 INIT_CPU_TIMERS(init_task)
142 .pi_lock = __RAW_SPIN_LOCK_UNLOCKED(init_task.pi_lock),
143 .timer_slack_ns = 50000, /* 50 usec default slack */
144 .thread_pid = &init_struct_pid,
145 .thread_node = LIST_HEAD_INIT(init_signals.thread_head),
146#ifdef CONFIG_AUDIT
147 .loginuid = INVALID_UID,
148 .sessionid = AUDIT_SID_UNSET,
149#endif
150#ifdef CONFIG_PERF_EVENTS
151 .perf_event_mutex = __MUTEX_INITIALIZER(init_task.perf_event_mutex),
152 .perf_event_list = LIST_HEAD_INIT(init_task.perf_event_list),
153#endif
154#ifdef CONFIG_PREEMPT_RCU
155 .rcu_read_lock_nesting = 0,
156 .rcu_read_unlock_special.s = 0,
157 .rcu_node_entry = LIST_HEAD_INIT(init_task.rcu_node_entry),
158 .rcu_blocked_node = NULL,
159#endif
160#ifdef CONFIG_TASKS_RCU
161 .rcu_tasks_holdout = false,
162 .rcu_tasks_holdout_list = LIST_HEAD_INIT(init_task.rcu_tasks_holdout_list),
163 .rcu_tasks_idle_cpu = -1,
164 .rcu_tasks_exit_list = LIST_HEAD_INIT(init_task.rcu_tasks_exit_list),
165#endif
166#ifdef CONFIG_TASKS_TRACE_RCU
167 .trc_reader_nesting = 0,
168 .trc_reader_special.s = 0,
169 .trc_holdout_list = LIST_HEAD_INIT(init_task.trc_holdout_list),
170 .trc_blkd_node = LIST_HEAD_INIT(init_task.trc_blkd_node),
171#endif
172#ifdef CONFIG_CPUSETS
173 .mems_allowed_seq = SEQCNT_SPINLOCK_ZERO(init_task.mems_allowed_seq,
174 &init_task.alloc_lock),
175#endif
176#ifdef CONFIG_RT_MUTEXES
177 .pi_waiters = RB_ROOT_CACHED,
178 .pi_top_task = NULL,
179#endif
180 INIT_PREV_CPUTIME(init_task)
181#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
182 .vtime.seqcount = SEQCNT_ZERO(init_task.vtime_seqcount),
183 .vtime.starttime = 0,
184 .vtime.state = VTIME_SYS,
185#endif
186#ifdef CONFIG_NUMA_BALANCING
187 .numa_preferred_nid = NUMA_NO_NODE,
188 .numa_group = NULL,
189 .numa_faults = NULL,
190#endif
191#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
192 .kasan_depth = 1,
193#endif
194#ifdef CONFIG_KCSAN
195 .kcsan_ctx = {
196 .scoped_accesses = {LIST_POISON1, NULL},
197 },
198#endif
199#ifdef CONFIG_TRACE_IRQFLAGS
200 .softirqs_enabled = 1,
201#endif
202#ifdef CONFIG_LOCKDEP
203 .lockdep_depth = 0, /* no locks held yet */
204 .curr_chain_key = INITIAL_CHAIN_KEY,
205 .lockdep_recursion = 0,
206#endif
207#ifdef CONFIG_FUNCTION_GRAPH_TRACER
208 .ret_stack = NULL,
209 .tracing_graph_pause = ATOMIC_INIT(0),
210#endif
211#if defined(CONFIG_TRACING) && defined(CONFIG_PREEMPTION)
212 .trace_recursion = 0,
213#endif
214#ifdef CONFIG_LIVEPATCH
215 .patch_state = KLP_TRANSITION_IDLE,
216#endif
217#ifdef CONFIG_SECURITY
218 .security = NULL,
219#endif
220#ifdef CONFIG_SECCOMP_FILTER
221 .seccomp = { .filter_count = ATOMIC_INIT(0) },
222#endif
223};
224EXPORT_SYMBOL(init_task);
225
226/*
227 * Initial thread structure. Alignment of this is handled by a special
228 * linker map entry.
229 */
230#ifndef CONFIG_THREAD_INFO_IN_TASK
231struct thread_info init_thread_info __init_thread_info = INIT_THREAD_INFO(init_task);
232#endif
233

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source code of linux/init/init_task.c