projects/linux·blob v4.17-rc3 · refs

187 lines · 5.1 KiB

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>
10#include <linux/fs.h>
11#include <linux/mm.h>
12
13#include <asm/pgtable.h>
14#include <linux/uaccess.h>
15
16static struct signal_struct init_signals = {
17 .nr_threads = 1,
18 .thread_head = LIST_HEAD_INIT(init_task.thread_node),
19 .wait_chldexit = __WAIT_QUEUE_HEAD_INITIALIZER(init_signals.wait_chldexit),
20 .shared_pending = {
21 .list = LIST_HEAD_INIT(init_signals.shared_pending.list),
22 .signal = {{0}}
23 },
24 .rlim = INIT_RLIMITS,
25 .cred_guard_mutex = __MUTEX_INITIALIZER(init_signals.cred_guard_mutex),
26#ifdef CONFIG_POSIX_TIMERS
27 .posix_timers = LIST_HEAD_INIT(init_signals.posix_timers),
28 .cputimer = {
29 .cputime_atomic = INIT_CPUTIME_ATOMIC,
30 .running = false,
31 .checking_timer = false,
32 },
33#endif
34 INIT_CPU_TIMERS(init_signals)
35 INIT_PREV_CPUTIME(init_signals)
36};
37
38static struct sighand_struct init_sighand = {
39 .count = ATOMIC_INIT(1),
40 .action = { { { .sa_handler = SIG_DFL, } }, },
41 .siglock = __SPIN_LOCK_UNLOCKED(init_sighand.siglock),
42 .signalfd_wqh = __WAIT_QUEUE_HEAD_INITIALIZER(init_sighand.signalfd_wqh),
43};
44
45/*
46 * Set up the first task table, touch at your own risk!. Base=0,
47 * limit=0x1fffff (=2MB)
48 */
49struct task_struct init_task
50#ifdef CONFIG_ARCH_TASK_STRUCT_ON_STACK
51 __init_task_data
52#endif
53= {
54#ifdef CONFIG_THREAD_INFO_IN_TASK
55 .thread_info = INIT_THREAD_INFO(init_task),
56 .stack_refcount = ATOMIC_INIT(1),
57#endif
58 .state = 0,
59 .stack = init_stack,
60 .usage = ATOMIC_INIT(2),
61 .flags = PF_KTHREAD,
62 .prio = MAX_PRIO - 20,
63 .static_prio = MAX_PRIO - 20,
64 .normal_prio = MAX_PRIO - 20,
65 .policy = SCHED_NORMAL,
66 .cpus_allowed = CPU_MASK_ALL,
67 .nr_cpus_allowed= NR_CPUS,
68 .mm = NULL,
69 .active_mm = &init_mm,
70 .restart_block = {
71 .fn = do_no_restart_syscall,
72 },
73 .se = {
74 .group_node = LIST_HEAD_INIT(init_task.se.group_node),
75 },
76 .rt = {
77 .run_list = LIST_HEAD_INIT(init_task.rt.run_list),
78 .time_slice = RR_TIMESLICE,
79 },
80 .tasks = LIST_HEAD_INIT(init_task.tasks),
81#ifdef CONFIG_SMP
82 .pushable_tasks = PLIST_NODE_INIT(init_task.pushable_tasks, MAX_PRIO),
83#endif
84#ifdef CONFIG_CGROUP_SCHED
85 .sched_task_group = &root_task_group,
86#endif
87 .ptraced = LIST_HEAD_INIT(init_task.ptraced),
88 .ptrace_entry = LIST_HEAD_INIT(init_task.ptrace_entry),
89 .real_parent = &init_task,
90 .parent = &init_task,
91 .children = LIST_HEAD_INIT(init_task.children),
92 .sibling = LIST_HEAD_INIT(init_task.sibling),
93 .group_leader = &init_task,
94 RCU_POINTER_INITIALIZER(real_cred, &init_cred),
95 RCU_POINTER_INITIALIZER(cred, &init_cred),
96 .comm = INIT_TASK_COMM,
97 .thread = INIT_THREAD,
98 .fs = &init_fs,
99 .files = &init_files,
100 .signal = &init_signals,
101 .sighand = &init_sighand,
102 .nsproxy = &init_nsproxy,
103 .pending = {
104 .list = LIST_HEAD_INIT(init_task.pending.list),
105 .signal = {{0}}
106 },
107 .blocked = {{0}},
108 .alloc_lock = __SPIN_LOCK_UNLOCKED(init_task.alloc_lock),
109 .journal_info = NULL,
110 INIT_CPU_TIMERS(init_task)
111 .pi_lock = __RAW_SPIN_LOCK_UNLOCKED(init_task.pi_lock),
112 .timer_slack_ns = 50000, /* 50 usec default slack */
113 .pids = {
114 [PIDTYPE_PID] = INIT_PID_LINK(PIDTYPE_PID),
115 [PIDTYPE_PGID] = INIT_PID_LINK(PIDTYPE_PGID),
116 [PIDTYPE_SID] = INIT_PID_LINK(PIDTYPE_SID),
117 },
118 .thread_group = LIST_HEAD_INIT(init_task.thread_group),
119 .thread_node = LIST_HEAD_INIT(init_signals.thread_head),
120#ifdef CONFIG_AUDITSYSCALL
121 .loginuid = INVALID_UID,
122 .sessionid = (unsigned int)-1,
123#endif
124#ifdef CONFIG_PERF_EVENTS
125 .perf_event_mutex = __MUTEX_INITIALIZER(init_task.perf_event_mutex),
126 .perf_event_list = LIST_HEAD_INIT(init_task.perf_event_list),
127#endif
128#ifdef CONFIG_PREEMPT_RCU
129 .rcu_read_lock_nesting = 0,
130 .rcu_read_unlock_special.s = 0,
131 .rcu_node_entry = LIST_HEAD_INIT(init_task.rcu_node_entry),
132 .rcu_blocked_node = NULL,
133#endif
134#ifdef CONFIG_TASKS_RCU
135 .rcu_tasks_holdout = false,
136 .rcu_tasks_holdout_list = LIST_HEAD_INIT(init_task.rcu_tasks_holdout_list),
137 .rcu_tasks_idle_cpu = -1,
138#endif
139#ifdef CONFIG_CPUSETS
140 .mems_allowed_seq = SEQCNT_ZERO(init_task.mems_allowed_seq),
141#endif
142#ifdef CONFIG_RT_MUTEXES
143 .pi_waiters = RB_ROOT_CACHED,
144 .pi_top_task = NULL,
145#endif
146 INIT_PREV_CPUTIME(init_task)
147#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
148 .vtime.seqcount = SEQCNT_ZERO(init_task.vtime_seqcount),
149 .vtime.starttime = 0,
150 .vtime.state = VTIME_SYS,
151#endif
152#ifdef CONFIG_NUMA_BALANCING
153 .numa_preferred_nid = -1,
154 .numa_group = NULL,
155 .numa_faults = NULL,
156#endif
157#ifdef CONFIG_KASAN
158 .kasan_depth = 1,
159#endif
160#ifdef CONFIG_TRACE_IRQFLAGS
161 .softirqs_enabled = 1,
162#endif
163#ifdef CONFIG_LOCKDEP
164 .lockdep_recursion = 0,
165#endif
166#ifdef CONFIG_FUNCTION_GRAPH_TRACER
167 .ret_stack = NULL,
168#endif
169#if defined(CONFIG_TRACING) && defined(CONFIG_PREEMPT)
170 .trace_recursion = 0,
171#endif
172#ifdef CONFIG_LIVEPATCH
173 .patch_state = KLP_UNDEFINED,
174#endif
175#ifdef CONFIG_SECURITY
176 .security = NULL,
177#endif
178};
179EXPORT_SYMBOL(init_task);
180
181/*
182 * Initial thread structure. Alignment of this is handled by a special
183 * linker map entry.
184 */
185#ifndef CONFIG_THREAD_INFO_IN_TASK
186struct thread_info init_thread_info __init_thread_info = INIT_THREAD_INFO(init_task);
187#endif