Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
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linux
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#ifdef CONFIG_CGROUPS
31 .cgroup_threadgroup_rwsem = __RWSEM_INITIALIZER(init_signals.cgroup_threadgroup_rwsem),
32#endif
33 .cred_guard_mutex = __MUTEX_INITIALIZER(init_signals.cred_guard_mutex),
34 .exec_update_lock = __RWSEM_INITIALIZER(init_signals.exec_update_lock),
35#ifdef CONFIG_POSIX_TIMERS
36 .posix_timers = HLIST_HEAD_INIT,
37 .ignored_posix_timers = HLIST_HEAD_INIT,
38 .cputimer = {
39 .cputime_atomic = INIT_CPUTIME_ATOMIC,
40 },
41#endif
42 INIT_CPU_TIMERS(init_signals)
43 .pids = {
44 [PIDTYPE_PID] = &init_struct_pid,
45 [PIDTYPE_TGID] = &init_struct_pid,
46 [PIDTYPE_PGID] = &init_struct_pid,
47 [PIDTYPE_SID] = &init_struct_pid,
48 },
49 INIT_PREV_CPUTIME(init_signals)
50};
51
52static struct sighand_struct init_sighand = {
53 .count = REFCOUNT_INIT(1),
54 .action = { { { .sa_handler = SIG_DFL, } }, },
55 .siglock = __SPIN_LOCK_UNLOCKED(init_sighand.siglock),
56 .signalfd_wqh = __WAIT_QUEUE_HEAD_INITIALIZER(init_sighand.signalfd_wqh),
57};
58
59#ifdef CONFIG_SHADOW_CALL_STACK
60unsigned long init_shadow_call_stack[SCS_SIZE / sizeof(long)] = {
61 [(SCS_SIZE / sizeof(long)) - 1] = SCS_END_MAGIC
62};
63#endif
64
65/* init to 2 - one for init_task, one to ensure it is never freed */
66static struct group_info init_groups = { .usage = REFCOUNT_INIT(2) };
67
68/*
69 * The initial credentials for the initial task
70 */
71static struct cred init_cred = {
72 .usage = ATOMIC_INIT(4),
73 .uid = GLOBAL_ROOT_UID,
74 .gid = GLOBAL_ROOT_GID,
75 .suid = GLOBAL_ROOT_UID,
76 .sgid = GLOBAL_ROOT_GID,
77 .euid = GLOBAL_ROOT_UID,
78 .egid = GLOBAL_ROOT_GID,
79 .fsuid = GLOBAL_ROOT_UID,
80 .fsgid = GLOBAL_ROOT_GID,
81 .securebits = SECUREBITS_DEFAULT,
82 .cap_inheritable = CAP_EMPTY_SET,
83 .cap_permitted = CAP_FULL_SET,
84 .cap_effective = CAP_FULL_SET,
85 .cap_bset = CAP_FULL_SET,
86 .user = INIT_USER,
87 .user_ns = &init_user_ns,
88 .group_info = &init_groups,
89 .ucounts = &init_ucounts,
90};
91
92/*
93 * Set up the first task table, touch at your own risk!. Base=0,
94 * limit=0x1fffff (=2MB)
95 */
96struct task_struct init_task __aligned(L1_CACHE_BYTES) = {
97#ifdef CONFIG_THREAD_INFO_IN_TASK
98 .thread_info = INIT_THREAD_INFO(init_task),
99 .stack_refcount = REFCOUNT_INIT(1),
100#endif
101 .__state = 0,
102 .stack = init_stack,
103 .usage = REFCOUNT_INIT(2),
104 .flags = PF_KTHREAD,
105 .prio = MAX_PRIO - 20,
106 .static_prio = MAX_PRIO - 20,
107 .normal_prio = MAX_PRIO - 20,
108 .policy = SCHED_NORMAL,
109 .cpus_ptr = &init_task.cpus_mask,
110 .user_cpus_ptr = NULL,
111 .cpus_mask = CPU_MASK_ALL,
112 .max_allowed_capacity = SCHED_CAPACITY_SCALE,
113 .nr_cpus_allowed= NR_CPUS,
114 .mm = NULL,
115 .active_mm = &init_mm,
116 .faults_disabled_mapping = NULL,
117 .restart_block = {
118 .fn = do_no_restart_syscall,
119 },
120 .se = {
121 .group_node = LIST_HEAD_INIT(init_task.se.group_node),
122 },
123 .rt = {
124 .run_list = LIST_HEAD_INIT(init_task.rt.run_list),
125 .time_slice = RR_TIMESLICE,
126 },
127 .tasks = LIST_HEAD_INIT(init_task.tasks),
128#ifdef CONFIG_SMP
129 .pushable_tasks = PLIST_NODE_INIT(init_task.pushable_tasks, MAX_PRIO),
130#endif
131#ifdef CONFIG_CGROUP_SCHED
132 .sched_task_group = &root_task_group,
133#endif
134#ifdef CONFIG_SCHED_CLASS_EXT
135 .scx = {
136 .dsq_list.node = LIST_HEAD_INIT(init_task.scx.dsq_list.node),
137 .sticky_cpu = -1,
138 .holding_cpu = -1,
139 .runnable_node = LIST_HEAD_INIT(init_task.scx.runnable_node),
140 .runnable_at = INITIAL_JIFFIES,
141 .ddsp_dsq_id = SCX_DSQ_INVALID,
142 .slice = SCX_SLICE_DFL,
143 },
144#endif
145 .ptraced = LIST_HEAD_INIT(init_task.ptraced),
146 .ptrace_entry = LIST_HEAD_INIT(init_task.ptrace_entry),
147 .real_parent = &init_task,
148 .parent = &init_task,
149 .children = LIST_HEAD_INIT(init_task.children),
150 .sibling = LIST_HEAD_INIT(init_task.sibling),
151 .group_leader = &init_task,
152 RCU_POINTER_INITIALIZER(real_cred, &init_cred),
153 RCU_POINTER_INITIALIZER(cred, &init_cred),
154 .comm = INIT_TASK_COMM,
155 .thread = INIT_THREAD,
156 .fs = &init_fs,
157 .files = &init_files,
158#ifdef CONFIG_IO_URING
159 .io_uring = NULL,
160#endif
161 .signal = &init_signals,
162 .sighand = &init_sighand,
163 .nsproxy = &init_nsproxy,
164 .pending = {
165 .list = LIST_HEAD_INIT(init_task.pending.list),
166 .signal = {{0}}
167 },
168 .blocked = {{0}},
169 .alloc_lock = __SPIN_LOCK_UNLOCKED(init_task.alloc_lock),
170 .journal_info = NULL,
171 INIT_CPU_TIMERS(init_task)
172 .pi_lock = __RAW_SPIN_LOCK_UNLOCKED(init_task.pi_lock),
173 .timer_slack_ns = 50000, /* 50 usec default slack */
174 .thread_pid = &init_struct_pid,
175 .thread_node = LIST_HEAD_INIT(init_signals.thread_head),
176#ifdef CONFIG_AUDIT
177 .loginuid = INVALID_UID,
178 .sessionid = AUDIT_SID_UNSET,
179#endif
180#ifdef CONFIG_PERF_EVENTS
181 .perf_event_mutex = __MUTEX_INITIALIZER(init_task.perf_event_mutex),
182 .perf_event_list = LIST_HEAD_INIT(init_task.perf_event_list),
183#endif
184#ifdef CONFIG_PREEMPT_RCU
185 .rcu_read_lock_nesting = 0,
186 .rcu_read_unlock_special.s = 0,
187 .rcu_node_entry = LIST_HEAD_INIT(init_task.rcu_node_entry),
188 .rcu_blocked_node = NULL,
189#endif
190#ifdef CONFIG_TASKS_RCU
191 .rcu_tasks_holdout = false,
192 .rcu_tasks_holdout_list = LIST_HEAD_INIT(init_task.rcu_tasks_holdout_list),
193 .rcu_tasks_idle_cpu = -1,
194 .rcu_tasks_exit_list = LIST_HEAD_INIT(init_task.rcu_tasks_exit_list),
195#endif
196#ifdef CONFIG_TASKS_TRACE_RCU
197 .trc_reader_nesting = 0,
198 .trc_reader_special.s = 0,
199 .trc_holdout_list = LIST_HEAD_INIT(init_task.trc_holdout_list),
200 .trc_blkd_node = LIST_HEAD_INIT(init_task.trc_blkd_node),
201#endif
202#ifdef CONFIG_CPUSETS
203 .mems_allowed_seq = SEQCNT_SPINLOCK_ZERO(init_task.mems_allowed_seq,
204 &init_task.alloc_lock),
205#endif
206#ifdef CONFIG_RT_MUTEXES
207 .pi_waiters = RB_ROOT_CACHED,
208 .pi_top_task = NULL,
209#endif
210 INIT_PREV_CPUTIME(init_task)
211#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
212 .vtime.seqcount = SEQCNT_ZERO(init_task.vtime_seqcount),
213 .vtime.starttime = 0,
214 .vtime.state = VTIME_SYS,
215#endif
216#ifdef CONFIG_NUMA_BALANCING
217 .numa_preferred_nid = NUMA_NO_NODE,
218 .numa_group = NULL,
219 .numa_faults = NULL,
220#endif
221#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
222 .kasan_depth = 1,
223#endif
224#ifdef CONFIG_KCSAN
225 .kcsan_ctx = {
226 .scoped_accesses = {LIST_POISON1, NULL},
227 },
228#endif
229#ifdef CONFIG_TRACE_IRQFLAGS
230 .softirqs_enabled = 1,
231#endif
232#ifdef CONFIG_LOCKDEP
233 .lockdep_depth = 0, /* no locks held yet */
234 .curr_chain_key = INITIAL_CHAIN_KEY,
235 .lockdep_recursion = 0,
236#endif
237#ifdef CONFIG_FUNCTION_GRAPH_TRACER
238 .ret_stack = NULL,
239 .tracing_graph_pause = ATOMIC_INIT(0),
240#endif
241#if defined(CONFIG_TRACING) && defined(CONFIG_PREEMPTION)
242 .trace_recursion = 0,
243#endif
244#ifdef CONFIG_LIVEPATCH
245 .patch_state = KLP_TRANSITION_IDLE,
246#endif
247#ifdef CONFIG_SECURITY
248 .security = NULL,
249#endif
250#ifdef CONFIG_SECCOMP_FILTER
251 .seccomp = { .filter_count = ATOMIC_INIT(0) },
252#endif
253#ifdef CONFIG_SCHED_MM_CID
254 .mm_cid = { .cid = MM_CID_UNSET, },
255#endif
256};
257EXPORT_SYMBOL(init_task);
258
259/*
260 * Initial thread structure. Alignment of this is handled by a special
261 * linker map entry.
262 */
263#ifndef CONFIG_THREAD_INFO_IN_TASK
264struct thread_info init_thread_info __init_thread_info = INIT_THREAD_INFO(init_task);
265#endif