Quelle  init_task.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
#include <linux/init_task.h>
#include <linux/export.h>
#include <linux/mqueue.h>
#include <linux/sched.h>
#include <linux/sched/sysctl.h>
#include <linux/sched/rt.h>
#include <linux/sched/task.h>
#include <linux/sched/ext.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/audit.h>
#include <linux/numa.h>
#include <linux/scs.h>
#include <linux/plist.h>

#include <linux/uaccess.h>

static struct signal_struct init_signals = {
 .nr_threads = 1,
 .thread_head = LIST_HEAD_INIT(init_task.thread_node),
 .wait_chldexit = __WAIT_QUEUE_HEAD_INITIALIZER(init_signals.wait_chldexit),
 .shared_pending = {
  .list = LIST_HEAD_INIT(init_signals.shared_pending.list),
  .signal =  {{0}}
 },
 .multiprocess = HLIST_HEAD_INIT,
 .rlim  = INIT_RLIMITS,
 .cred_guard_mutex = __MUTEX_INITIALIZER(init_signals.cred_guard_mutex),
 .exec_update_lock = __RWSEM_INITIALIZER(init_signals.exec_update_lock),
#ifdef CONFIG_POSIX_TIMERS
 .posix_timers  = HLIST_HEAD_INIT,
 .ignored_posix_timers = HLIST_HEAD_INIT,
 .cputimer  = {
  .cputime_atomic = INIT_CPUTIME_ATOMIC,
 },
#endif
 INIT_CPU_TIMERS(init_signals)
 .pids = {
  [PIDTYPE_PID] = &init_struct_pid,
  [PIDTYPE_TGID] = &init_struct_pid,
  [PIDTYPE_PGID] = &init_struct_pid,
  [PIDTYPE_SID] = &init_struct_pid,
 },
 INIT_PREV_CPUTIME(init_signals)
};

static struct sighand_struct init_sighand = {
 .count  = REFCOUNT_INIT(1),
 .action  = { { { .sa_handler = SIG_DFL, } }, },
 .siglock = __SPIN_LOCK_UNLOCKED(init_sighand.siglock),
 .signalfd_wqh = __WAIT_QUEUE_HEAD_INITIALIZER(init_sighand.signalfd_wqh),
};

#ifdef CONFIG_SHADOW_CALL_STACK
unsigned long init_shadow_call_stack[SCS_SIZE / sizeof(long)] = {
 [(SCS_SIZE / sizeof(long)) - 1] = SCS_END_MAGIC
};
#endif

/*
 * Set up the first task table, touch at your own risk!. Base=0,
 * limit=0x1fffff (=2MB)
 */
struct task_struct init_task __aligned(L1_CACHE_BYTES) = {
#ifdef CONFIG_THREAD_INFO_IN_TASK
 .thread_info = INIT_THREAD_INFO(init_task),
 .stack_refcount = REFCOUNT_INIT(1),
#endif
 .__state = 0,
 .stack  = init_stack,
 .usage  = REFCOUNT_INIT(2),
 .flags  = PF_KTHREAD,
 .prio  = MAX_PRIO - 20,
 .static_prio = MAX_PRIO - 20,
 .normal_prio = MAX_PRIO - 20,
 .policy  = SCHED_NORMAL,
 .cpus_ptr = &init_task.cpus_mask,
 .user_cpus_ptr = NULL,
 .cpus_mask = CPU_MASK_ALL,
 .max_allowed_capacity = SCHED_CAPACITY_SCALE,
 .nr_cpus_allowed= NR_CPUS,
 .mm  = NULL,
 .active_mm = &init_mm,
 .faults_disabled_mapping = NULL,
 .restart_block = {
  .fn = do_no_restart_syscall,
 },
 .se  = {
  .group_node  = LIST_HEAD_INIT(init_task.se.group_node),
 },
 .rt  = {
  .run_list = LIST_HEAD_INIT(init_task.rt.run_list),
  .time_slice = RR_TIMESLICE,
 },
 .tasks  = LIST_HEAD_INIT(init_task.tasks),
#ifdef CONFIG_SMP
 .pushable_tasks = PLIST_NODE_INIT(init_task.pushable_tasks, MAX_PRIO),
#endif
#ifdef CONFIG_CGROUP_SCHED
 .sched_task_group = &root_task_group,
#endif
#ifdef CONFIG_SCHED_CLASS_EXT
 .scx  = {
  .dsq_list.node = LIST_HEAD_INIT(init_task.scx.dsq_list.node),
  .sticky_cpu = -1,
  .holding_cpu = -1,
  .runnable_node = LIST_HEAD_INIT(init_task.scx.runnable_node),
  .runnable_at = INITIAL_JIFFIES,
  .ddsp_dsq_id = SCX_DSQ_INVALID,
  .slice  = SCX_SLICE_DFL,
 },
#endif
 .ptraced = LIST_HEAD_INIT(init_task.ptraced),
 .ptrace_entry = LIST_HEAD_INIT(init_task.ptrace_entry),
 .real_parent = &init_task,
 .parent  = &init_task,
 .children = LIST_HEAD_INIT(init_task.children),
 .sibling = LIST_HEAD_INIT(init_task.sibling),
 .group_leader = &init_task,
 RCU_POINTER_INITIALIZER(real_cred, &init_cred),
 RCU_POINTER_INITIALIZER(cred, &init_cred),
 .comm  = INIT_TASK_COMM,
 .thread  = INIT_THREAD,
 .fs  = &init_fs,
 .files  = &init_files,
#ifdef CONFIG_IO_URING
 .io_uring = NULL,
#endif
 .signal  = &init_signals,
 .sighand = &init_sighand,
 .nsproxy = &init_nsproxy,
 .pending = {
  .list = LIST_HEAD_INIT(init_task.pending.list),
  .signal = {{0}}
 },
 .blocked = {{0}},
 .alloc_lock = __SPIN_LOCK_UNLOCKED(init_task.alloc_lock),
 .journal_info = NULL,
 INIT_CPU_TIMERS(init_task)
 .pi_lock = __RAW_SPIN_LOCK_UNLOCKED(init_task.pi_lock),
 .timer_slack_ns = 50000, /* 50 usec default slack */
 .thread_pid = &init_struct_pid,
 .thread_node = LIST_HEAD_INIT(init_signals.thread_head),
#ifdef CONFIG_AUDIT
 .loginuid = INVALID_UID,
 .sessionid = AUDIT_SID_UNSET,
#endif
#ifdef CONFIG_PERF_EVENTS
 .perf_event_mutex = __MUTEX_INITIALIZER(init_task.perf_event_mutex),
 .perf_event_list = LIST_HEAD_INIT(init_task.perf_event_list),
#endif
#ifdef CONFIG_PREEMPT_RCU
 .rcu_read_lock_nesting = 0,
 .rcu_read_unlock_special.s = 0,
 .rcu_node_entry = LIST_HEAD_INIT(init_task.rcu_node_entry),
 .rcu_blocked_node = NULL,
#endif
#ifdef CONFIG_TASKS_RCU
 .rcu_tasks_holdout = false,
 .rcu_tasks_holdout_list = LIST_HEAD_INIT(init_task.rcu_tasks_holdout_list),
 .rcu_tasks_idle_cpu = -1,
 .rcu_tasks_exit_list = LIST_HEAD_INIT(init_task.rcu_tasks_exit_list),
#endif
#ifdef CONFIG_TASKS_TRACE_RCU
 .trc_reader_nesting = 0,
 .trc_reader_special.s = 0,
 .trc_holdout_list = LIST_HEAD_INIT(init_task.trc_holdout_list),
 .trc_blkd_node = LIST_HEAD_INIT(init_task.trc_blkd_node),
#endif
#ifdef CONFIG_CPUSETS
 .mems_allowed_seq = SEQCNT_SPINLOCK_ZERO(init_task.mems_allowed_seq,
       &init_task.alloc_lock),
#endif
#ifdef CONFIG_RT_MUTEXES
 .pi_waiters = RB_ROOT_CACHED,
 .pi_top_task = NULL,
#endif
 INIT_PREV_CPUTIME(init_task)
#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
 .vtime.seqcount = SEQCNT_ZERO(init_task.vtime_seqcount),
 .vtime.starttime = 0,
 .vtime.state = VTIME_SYS,
#endif
#ifdef CONFIG_NUMA_BALANCING
 .numa_preferred_nid = NUMA_NO_NODE,
 .numa_group = NULL,
 .numa_faults = NULL,
#endif
#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
 .kasan_depth = 1,
#endif
#ifdef CONFIG_KCSAN
 .kcsan_ctx = {
  .scoped_accesses = {LIST_POISON1, NULL},
 },
#endif
#ifdef CONFIG_TRACE_IRQFLAGS
 .softirqs_enabled = 1,
#endif
#ifdef CONFIG_LOCKDEP
 .lockdep_depth = 0, /* no locks held yet */
 .curr_chain_key = INITIAL_CHAIN_KEY,
 .lockdep_recursion = 0,
#endif
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
 .ret_stack  = NULL,
 .tracing_graph_pause = ATOMIC_INIT(0),
#endif
#if defined(CONFIG_TRACING) && defined(CONFIG_PREEMPTION)
 .trace_recursion = 0,
#endif
#ifdef CONFIG_LIVEPATCH
 .patch_state = KLP_TRANSITION_IDLE,
#endif
#ifdef CONFIG_SECURITY
 .security = NULL,
#endif
#ifdef CONFIG_SECCOMP_FILTER
 .seccomp = { .filter_count = ATOMIC_INIT(0) },
#endif
};
EXPORT_SYMBOL(init_task);

/*
 * Initial thread structure. Alignment of this is handled by a special
 * linker map entry.
 */
#ifndef CONFIG_THREAD_INFO_IN_TASK
struct thread_info init_thread_info __init_thread_info = INIT_THREAD_INFO(init_task);
#endif