7ab773b9b3cd566c504e84d6fc06a0d869705145
[sfrench/cifs-2.6.git] / init / init_task.c
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 #include <linux/audit.h>
13 #include <linux/numa.h>
14
15 #include <asm/pgtable.h>
16 #include <linux/uaccess.h>
17
18 static struct signal_struct init_signals = {
19         .nr_threads     = 1,
20         .thread_head    = LIST_HEAD_INIT(init_task.thread_node),
21         .wait_chldexit  = __WAIT_QUEUE_HEAD_INITIALIZER(init_signals.wait_chldexit),
22         .shared_pending = {
23                 .list = LIST_HEAD_INIT(init_signals.shared_pending.list),
24                 .signal =  {{0}}
25         },
26         .multiprocess   = HLIST_HEAD_INIT,
27         .rlim           = INIT_RLIMITS,
28         .cred_guard_mutex = __MUTEX_INITIALIZER(init_signals.cred_guard_mutex),
29 #ifdef CONFIG_POSIX_TIMERS
30         .posix_timers = LIST_HEAD_INIT(init_signals.posix_timers),
31         .cputimer       = {
32                 .cputime_atomic = INIT_CPUTIME_ATOMIC,
33                 .running        = false,
34                 .checking_timer = false,
35         },
36 #endif
37         INIT_CPU_TIMERS(init_signals)
38         .pids = {
39                 [PIDTYPE_PID]   = &init_struct_pid,
40                 [PIDTYPE_TGID]  = &init_struct_pid,
41                 [PIDTYPE_PGID]  = &init_struct_pid,
42                 [PIDTYPE_SID]   = &init_struct_pid,
43         },
44         INIT_PREV_CPUTIME(init_signals)
45 };
46
47 static struct sighand_struct init_sighand = {
48         .count          = REFCOUNT_INIT(1),
49         .action         = { { { .sa_handler = SIG_DFL, } }, },
50         .siglock        = __SPIN_LOCK_UNLOCKED(init_sighand.siglock),
51         .signalfd_wqh   = __WAIT_QUEUE_HEAD_INITIALIZER(init_sighand.signalfd_wqh),
52 };
53
54 /*
55  * Set up the first task table, touch at your own risk!. Base=0,
56  * limit=0x1fffff (=2MB)
57  */
58 struct task_struct init_task
59 #ifdef CONFIG_ARCH_TASK_STRUCT_ON_STACK
60         __init_task_data
61 #endif
62 = {
63 #ifdef CONFIG_THREAD_INFO_IN_TASK
64         .thread_info    = INIT_THREAD_INFO(init_task),
65         .stack_refcount = REFCOUNT_INIT(1),
66 #endif
67         .state          = 0,
68         .stack          = init_stack,
69         .usage          = REFCOUNT_INIT(2),
70         .flags          = PF_KTHREAD,
71         .prio           = MAX_PRIO - 20,
72         .static_prio    = MAX_PRIO - 20,
73         .normal_prio    = MAX_PRIO - 20,
74         .policy         = SCHED_NORMAL,
75         .cpus_ptr       = &init_task.cpus_mask,
76         .cpus_mask      = CPU_MASK_ALL,
77         .nr_cpus_allowed= NR_CPUS,
78         .mm             = NULL,
79         .active_mm      = &init_mm,
80         .restart_block  = {
81                 .fn = do_no_restart_syscall,
82         },
83         .se             = {
84                 .group_node     = LIST_HEAD_INIT(init_task.se.group_node),
85         },
86         .rt             = {
87                 .run_list       = LIST_HEAD_INIT(init_task.rt.run_list),
88                 .time_slice     = RR_TIMESLICE,
89         },
90         .tasks          = LIST_HEAD_INIT(init_task.tasks),
91 #ifdef CONFIG_SMP
92         .pushable_tasks = PLIST_NODE_INIT(init_task.pushable_tasks, MAX_PRIO),
93 #endif
94 #ifdef CONFIG_CGROUP_SCHED
95         .sched_task_group = &root_task_group,
96 #endif
97         .ptraced        = LIST_HEAD_INIT(init_task.ptraced),
98         .ptrace_entry   = LIST_HEAD_INIT(init_task.ptrace_entry),
99         .real_parent    = &init_task,
100         .parent         = &init_task,
101         .children       = LIST_HEAD_INIT(init_task.children),
102         .sibling        = LIST_HEAD_INIT(init_task.sibling),
103         .group_leader   = &init_task,
104         RCU_POINTER_INITIALIZER(real_cred, &init_cred),
105         RCU_POINTER_INITIALIZER(cred, &init_cred),
106         .comm           = INIT_TASK_COMM,
107         .thread         = INIT_THREAD,
108         .fs             = &init_fs,
109         .files          = &init_files,
110         .signal         = &init_signals,
111         .sighand        = &init_sighand,
112         .nsproxy        = &init_nsproxy,
113         .pending        = {
114                 .list = LIST_HEAD_INIT(init_task.pending.list),
115                 .signal = {{0}}
116         },
117         .blocked        = {{0}},
118         .alloc_lock     = __SPIN_LOCK_UNLOCKED(init_task.alloc_lock),
119         .journal_info   = NULL,
120         INIT_CPU_TIMERS(init_task)
121         .pi_lock        = __RAW_SPIN_LOCK_UNLOCKED(init_task.pi_lock),
122         .timer_slack_ns = 50000, /* 50 usec default slack */
123         .thread_pid     = &init_struct_pid,
124         .thread_group   = LIST_HEAD_INIT(init_task.thread_group),
125         .thread_node    = LIST_HEAD_INIT(init_signals.thread_head),
126 #ifdef CONFIG_AUDIT
127         .loginuid       = INVALID_UID,
128         .sessionid      = AUDIT_SID_UNSET,
129 #endif
130 #ifdef CONFIG_PERF_EVENTS
131         .perf_event_mutex = __MUTEX_INITIALIZER(init_task.perf_event_mutex),
132         .perf_event_list = LIST_HEAD_INIT(init_task.perf_event_list),
133 #endif
134 #ifdef CONFIG_PREEMPT_RCU
135         .rcu_read_lock_nesting = 0,
136         .rcu_read_unlock_special.s = 0,
137         .rcu_node_entry = LIST_HEAD_INIT(init_task.rcu_node_entry),
138         .rcu_blocked_node = NULL,
139 #endif
140 #ifdef CONFIG_TASKS_RCU
141         .rcu_tasks_holdout = false,
142         .rcu_tasks_holdout_list = LIST_HEAD_INIT(init_task.rcu_tasks_holdout_list),
143         .rcu_tasks_idle_cpu = -1,
144 #endif
145 #ifdef CONFIG_CPUSETS
146         .mems_allowed_seq = SEQCNT_ZERO(init_task.mems_allowed_seq),
147 #endif
148 #ifdef CONFIG_RT_MUTEXES
149         .pi_waiters     = RB_ROOT_CACHED,
150         .pi_top_task    = NULL,
151 #endif
152         INIT_PREV_CPUTIME(init_task)
153 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
154         .vtime.seqcount = SEQCNT_ZERO(init_task.vtime_seqcount),
155         .vtime.starttime = 0,
156         .vtime.state    = VTIME_SYS,
157 #endif
158 #ifdef CONFIG_NUMA_BALANCING
159         .numa_preferred_nid = NUMA_NO_NODE,
160         .numa_group     = NULL,
161         .numa_faults    = NULL,
162 #endif
163 #ifdef CONFIG_KASAN
164         .kasan_depth    = 1,
165 #endif
166 #ifdef CONFIG_TRACE_IRQFLAGS
167         .softirqs_enabled = 1,
168 #endif
169 #ifdef CONFIG_LOCKDEP
170         .lockdep_depth = 0, /* no locks held yet */
171         .curr_chain_key = INITIAL_CHAIN_KEY,
172         .lockdep_recursion = 0,
173 #endif
174 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
175         .ret_stack      = NULL,
176 #endif
177 #if defined(CONFIG_TRACING) && defined(CONFIG_PREEMPT)
178         .trace_recursion = 0,
179 #endif
180 #ifdef CONFIG_LIVEPATCH
181         .patch_state    = KLP_UNDEFINED,
182 #endif
183 #ifdef CONFIG_SECURITY
184         .security       = NULL,
185 #endif
186 };
187 EXPORT_SYMBOL(init_task);
188
189 /*
190  * Initial thread structure. Alignment of this is handled by a special
191  * linker map entry.
192  */
193 #ifndef CONFIG_THREAD_INFO_IN_TASK
194 struct thread_info init_thread_info __init_thread_info = INIT_THREAD_INFO(init_task);
195 #endif