Merge tag 'kvmarm-fixes-6.0-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmar...
[platform/kernel/linux-rpi.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 #include <linux/scs.h>
15
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         .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),
32         .cputimer       = {
33                 .cputime_atomic = INIT_CPUTIME_ATOMIC,
34         },
35 #endif
36         INIT_CPU_TIMERS(init_signals)
37         .pids = {
38                 [PIDTYPE_PID]   = &init_struct_pid,
39                 [PIDTYPE_TGID]  = &init_struct_pid,
40                 [PIDTYPE_PGID]  = &init_struct_pid,
41                 [PIDTYPE_SID]   = &init_struct_pid,
42         },
43         INIT_PREV_CPUTIME(init_signals)
44 };
45
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),
51 };
52
53 #ifdef CONFIG_SHADOW_CALL_STACK
54 unsigned long init_shadow_call_stack[SCS_SIZE / sizeof(long)]
55                 __init_task_data = {
56         [(SCS_SIZE / sizeof(long)) - 1] = SCS_END_MAGIC
57 };
58 #endif
59
60 /*
61  * Set up the first task table, touch at your own risk!. Base=0,
62  * limit=0x1fffff (=2MB)
63  */
64 struct task_struct init_task
65 #ifdef CONFIG_ARCH_TASK_STRUCT_ON_STACK
66         __init_task_data
67 #endif
68         __aligned(L1_CACHE_BYTES)
69 = {
70 #ifdef CONFIG_THREAD_INFO_IN_TASK
71         .thread_info    = INIT_THREAD_INFO(init_task),
72         .stack_refcount = REFCOUNT_INIT(1),
73 #endif
74         .__state        = 0,
75         .stack          = init_stack,
76         .usage          = REFCOUNT_INIT(2),
77         .flags          = PF_KTHREAD,
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,
86         .mm             = NULL,
87         .active_mm      = &init_mm,
88         .restart_block  = {
89                 .fn = do_no_restart_syscall,
90         },
91         .se             = {
92                 .group_node     = LIST_HEAD_INIT(init_task.se.group_node),
93         },
94         .rt             = {
95                 .run_list       = LIST_HEAD_INIT(init_task.rt.run_list),
96                 .time_slice     = RR_TIMESLICE,
97         },
98         .tasks          = LIST_HEAD_INIT(init_task.tasks),
99 #ifdef CONFIG_SMP
100         .pushable_tasks = PLIST_NODE_INIT(init_task.pushable_tasks, MAX_PRIO),
101 #endif
102 #ifdef CONFIG_CGROUP_SCHED
103         .sched_task_group = &root_task_group,
104 #endif
105         .ptraced        = LIST_HEAD_INIT(init_task.ptraced),
106         .ptrace_entry   = LIST_HEAD_INIT(init_task.ptrace_entry),
107         .real_parent    = &init_task,
108         .parent         = &init_task,
109         .children       = LIST_HEAD_INIT(init_task.children),
110         .sibling        = LIST_HEAD_INIT(init_task.sibling),
111         .group_leader   = &init_task,
112         RCU_POINTER_INITIALIZER(real_cred, &init_cred),
113         RCU_POINTER_INITIALIZER(cred, &init_cred),
114         .comm           = INIT_TASK_COMM,
115         .thread         = INIT_THREAD,
116         .fs             = &init_fs,
117         .files          = &init_files,
118 #ifdef CONFIG_IO_URING
119         .io_uring       = NULL,
120 #endif
121         .signal         = &init_signals,
122         .sighand        = &init_sighand,
123         .nsproxy        = &init_nsproxy,
124         .pending        = {
125                 .list = LIST_HEAD_INIT(init_task.pending.list),
126                 .signal = {{0}}
127         },
128         .blocked        = {{0}},
129         .alloc_lock     = __SPIN_LOCK_UNLOCKED(init_task.alloc_lock),
130         .journal_info   = NULL,
131         INIT_CPU_TIMERS(init_task)
132         .pi_lock        = __RAW_SPIN_LOCK_UNLOCKED(init_task.pi_lock),
133         .timer_slack_ns = 50000, /* 50 usec default slack */
134         .thread_pid     = &init_struct_pid,
135         .thread_group   = LIST_HEAD_INIT(init_task.thread_group),
136         .thread_node    = LIST_HEAD_INIT(init_signals.thread_head),
137 #ifdef CONFIG_AUDIT
138         .loginuid       = INVALID_UID,
139         .sessionid      = AUDIT_SID_UNSET,
140 #endif
141 #ifdef CONFIG_PERF_EVENTS
142         .perf_event_mutex = __MUTEX_INITIALIZER(init_task.perf_event_mutex),
143         .perf_event_list = LIST_HEAD_INIT(init_task.perf_event_list),
144 #endif
145 #ifdef CONFIG_PREEMPT_RCU
146         .rcu_read_lock_nesting = 0,
147         .rcu_read_unlock_special.s = 0,
148         .rcu_node_entry = LIST_HEAD_INIT(init_task.rcu_node_entry),
149         .rcu_blocked_node = NULL,
150 #endif
151 #ifdef CONFIG_TASKS_RCU
152         .rcu_tasks_holdout = false,
153         .rcu_tasks_holdout_list = LIST_HEAD_INIT(init_task.rcu_tasks_holdout_list),
154         .rcu_tasks_idle_cpu = -1,
155 #endif
156 #ifdef CONFIG_TASKS_TRACE_RCU
157         .trc_reader_nesting = 0,
158         .trc_reader_special.s = 0,
159         .trc_holdout_list = LIST_HEAD_INIT(init_task.trc_holdout_list),
160         .trc_blkd_node = LIST_HEAD_INIT(init_task.trc_blkd_node),
161 #endif
162 #ifdef CONFIG_CPUSETS
163         .mems_allowed_seq = SEQCNT_SPINLOCK_ZERO(init_task.mems_allowed_seq,
164                                                  &init_task.alloc_lock),
165 #endif
166 #ifdef CONFIG_RT_MUTEXES
167         .pi_waiters     = RB_ROOT_CACHED,
168         .pi_top_task    = NULL,
169 #endif
170         INIT_PREV_CPUTIME(init_task)
171 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
172         .vtime.seqcount = SEQCNT_ZERO(init_task.vtime_seqcount),
173         .vtime.starttime = 0,
174         .vtime.state    = VTIME_SYS,
175 #endif
176 #ifdef CONFIG_NUMA_BALANCING
177         .numa_preferred_nid = NUMA_NO_NODE,
178         .numa_group     = NULL,
179         .numa_faults    = NULL,
180 #endif
181 #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
182         .kasan_depth    = 1,
183 #endif
184 #ifdef CONFIG_KCSAN
185         .kcsan_ctx = {
186                 .scoped_accesses        = {LIST_POISON1, NULL},
187         },
188 #endif
189 #ifdef CONFIG_TRACE_IRQFLAGS
190         .softirqs_enabled = 1,
191 #endif
192 #ifdef CONFIG_LOCKDEP
193         .lockdep_depth = 0, /* no locks held yet */
194         .curr_chain_key = INITIAL_CHAIN_KEY,
195         .lockdep_recursion = 0,
196 #endif
197 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
198         .ret_stack              = NULL,
199         .tracing_graph_pause    = ATOMIC_INIT(0),
200 #endif
201 #if defined(CONFIG_TRACING) && defined(CONFIG_PREEMPTION)
202         .trace_recursion = 0,
203 #endif
204 #ifdef CONFIG_LIVEPATCH
205         .patch_state    = KLP_UNDEFINED,
206 #endif
207 #ifdef CONFIG_SECURITY
208         .security       = NULL,
209 #endif
210 #ifdef CONFIG_SECCOMP_FILTER
211         .seccomp        = { .filter_count = ATOMIC_INIT(0) },
212 #endif
213 };
214 EXPORT_SYMBOL(init_task);
215
216 /*
217  * Initial thread structure. Alignment of this is handled by a special
218  * linker map entry.
219  */
220 #ifndef CONFIG_THREAD_INFO_IN_TASK
221 struct thread_info init_thread_info __init_thread_info = INIT_THREAD_INFO(init_task);
222 #endif