linux/include/linux/init_task.h
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   1#ifndef _LINUX__INIT_TASK_H
   2#define _LINUX__INIT_TASK_H
   3
   4#include <linux/rcupdate.h>
   5#include <linux/irqflags.h>
   6#include <linux/utsname.h>
   7#include <linux/lockdep.h>
   8#include <linux/ftrace.h>
   9#include <linux/ipc.h>
  10#include <linux/pid_namespace.h>
  11#include <linux/user_namespace.h>
  12#include <linux/securebits.h>
  13#include <linux/seqlock.h>
  14#include <net/net_namespace.h>
  15#include <linux/sched/rt.h>
  16
  17#ifdef CONFIG_SMP
  18# define INIT_PUSHABLE_TASKS(tsk)                                       \
  19        .pushable_tasks = PLIST_NODE_INIT(tsk.pushable_tasks, MAX_PRIO),
  20#else
  21# define INIT_PUSHABLE_TASKS(tsk)
  22#endif
  23
  24extern struct files_struct init_files;
  25extern struct fs_struct init_fs;
  26
  27#ifdef CONFIG_CGROUPS
  28#define INIT_GROUP_RWSEM(sig)                                           \
  29        .group_rwsem = __RWSEM_INITIALIZER(sig.group_rwsem),
  30#else
  31#define INIT_GROUP_RWSEM(sig)
  32#endif
  33
  34#ifdef CONFIG_CPUSETS
  35#define INIT_CPUSET_SEQ                                                 \
  36        .mems_allowed_seq = SEQCNT_ZERO,
  37#else
  38#define INIT_CPUSET_SEQ
  39#endif
  40
  41#define INIT_SIGNALS(sig) {                                             \
  42        .nr_threads     = 1,                                            \
  43        .wait_chldexit  = __WAIT_QUEUE_HEAD_INITIALIZER(sig.wait_chldexit),\
  44        .shared_pending = {                                             \
  45                .list = LIST_HEAD_INIT(sig.shared_pending.list),        \
  46                .signal =  {{0}}},                                      \
  47        .posix_timers    = LIST_HEAD_INIT(sig.posix_timers),            \
  48        .cpu_timers     = INIT_CPU_TIMERS(sig.cpu_timers),              \
  49        .rlim           = INIT_RLIMITS,                                 \
  50        .cputimer       = {                                             \
  51                .cputime = INIT_CPUTIME,                                \
  52                .running = 0,                                           \
  53                .lock = __RAW_SPIN_LOCK_UNLOCKED(sig.cputimer.lock),    \
  54        },                                                              \
  55        .cred_guard_mutex =                                             \
  56                 __MUTEX_INITIALIZER(sig.cred_guard_mutex),             \
  57        INIT_GROUP_RWSEM(sig)                                           \
  58}
  59
  60extern struct nsproxy init_nsproxy;
  61
  62#define INIT_SIGHAND(sighand) {                                         \
  63        .count          = ATOMIC_INIT(1),                               \
  64        .action         = { { { .sa_handler = SIG_DFL, } }, },          \
  65        .siglock        = __SPIN_LOCK_UNLOCKED(sighand.siglock),        \
  66        .signalfd_wqh   = __WAIT_QUEUE_HEAD_INITIALIZER(sighand.signalfd_wqh),  \
  67}
  68
  69extern struct group_info init_groups;
  70
  71#define INIT_STRUCT_PID {                                               \
  72        .count          = ATOMIC_INIT(1),                               \
  73        .tasks          = {                                             \
  74                { .first = NULL },                                      \
  75                { .first = NULL },                                      \
  76                { .first = NULL },                                      \
  77        },                                                              \
  78        .level          = 0,                                            \
  79        .numbers        = { {                                           \
  80                .nr             = 0,                                    \
  81                .ns             = &init_pid_ns,                         \
  82                .pid_chain      = { .next = NULL, .pprev = NULL },      \
  83        }, }                                                            \
  84}
  85
  86#define INIT_PID_LINK(type)                                     \
  87{                                                               \
  88        .node = {                                               \
  89                .next = NULL,                                   \
  90                .pprev = NULL,                                  \
  91        },                                                      \
  92        .pid = &init_struct_pid,                                \
  93}
  94
  95#ifdef CONFIG_AUDITSYSCALL
  96#define INIT_IDS \
  97        .loginuid = INVALID_UID, \
  98        .sessionid = -1,
  99#else
 100#define INIT_IDS
 101#endif
 102
 103#ifdef CONFIG_RCU_BOOST
 104#define INIT_TASK_RCU_BOOST()                                           \
 105        .rcu_boost_mutex = NULL,
 106#else
 107#define INIT_TASK_RCU_BOOST()
 108#endif
 109#ifdef CONFIG_TREE_PREEMPT_RCU
 110#define INIT_TASK_RCU_TREE_PREEMPT()                                    \
 111        .rcu_blocked_node = NULL,
 112#else
 113#define INIT_TASK_RCU_TREE_PREEMPT(tsk)
 114#endif
 115#ifdef CONFIG_PREEMPT_RCU
 116#define INIT_TASK_RCU_PREEMPT(tsk)                                      \
 117        .rcu_read_lock_nesting = 0,                                     \
 118        .rcu_read_unlock_special = 0,                                   \
 119        .rcu_node_entry = LIST_HEAD_INIT(tsk.rcu_node_entry),           \
 120        INIT_TASK_RCU_TREE_PREEMPT()                                    \
 121        INIT_TASK_RCU_BOOST()
 122#else
 123#define INIT_TASK_RCU_PREEMPT(tsk)
 124#endif
 125
 126extern struct cred init_cred;
 127
 128extern struct task_group root_task_group;
 129
 130#ifdef CONFIG_CGROUP_SCHED
 131# define INIT_CGROUP_SCHED(tsk)                                         \
 132        .sched_task_group = &root_task_group,
 133#else
 134# define INIT_CGROUP_SCHED(tsk)
 135#endif
 136
 137#ifdef CONFIG_PERF_EVENTS
 138# define INIT_PERF_EVENTS(tsk)                                          \
 139        .perf_event_mutex =                                             \
 140                 __MUTEX_INITIALIZER(tsk.perf_event_mutex),             \
 141        .perf_event_list = LIST_HEAD_INIT(tsk.perf_event_list),
 142#else
 143# define INIT_PERF_EVENTS(tsk)
 144#endif
 145
 146#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
 147# define INIT_VTIME(tsk)                                                \
 148        .vtime_seqlock = __SEQLOCK_UNLOCKED(tsk.vtime_seqlock), \
 149        .vtime_snap = 0,                                \
 150        .vtime_snap_whence = VTIME_SYS,
 151#else
 152# define INIT_VTIME(tsk)
 153#endif
 154
 155#define INIT_TASK_COMM "swapper"
 156
 157/*
 158 *  INIT_TASK is used to set up the first task table, touch at
 159 * your own risk!. Base=0, limit=0x1fffff (=2MB)
 160 */
 161#define INIT_TASK(tsk)  \
 162{                                                                       \
 163        .state          = 0,                                            \
 164        .stack          = &init_thread_info,                            \
 165        .usage          = ATOMIC_INIT(2),                               \
 166        .flags          = PF_KTHREAD,                                   \
 167        .prio           = MAX_PRIO-20,                                  \
 168        .static_prio    = MAX_PRIO-20,                                  \
 169        .normal_prio    = MAX_PRIO-20,                                  \
 170        .policy         = SCHED_NORMAL,                                 \
 171        .cpus_allowed   = CPU_MASK_ALL,                                 \
 172        .nr_cpus_allowed= NR_CPUS,                                      \
 173        .mm             = NULL,                                         \
 174        .active_mm      = &init_mm,                                     \
 175        .se             = {                                             \
 176                .group_node     = LIST_HEAD_INIT(tsk.se.group_node),    \
 177        },                                                              \
 178        .rt             = {                                             \
 179                .run_list       = LIST_HEAD_INIT(tsk.rt.run_list),      \
 180                .time_slice     = RR_TIMESLICE,                         \
 181        },                                                              \
 182        .tasks          = LIST_HEAD_INIT(tsk.tasks),                    \
 183        INIT_PUSHABLE_TASKS(tsk)                                        \
 184        INIT_CGROUP_SCHED(tsk)                                          \
 185        .ptraced        = LIST_HEAD_INIT(tsk.ptraced),                  \
 186        .ptrace_entry   = LIST_HEAD_INIT(tsk.ptrace_entry),             \
 187        .real_parent    = &tsk,                                         \
 188        .parent         = &tsk,                                         \
 189        .children       = LIST_HEAD_INIT(tsk.children),                 \
 190        .sibling        = LIST_HEAD_INIT(tsk.sibling),                  \
 191        .group_leader   = &tsk,                                         \
 192        RCU_POINTER_INITIALIZER(real_cred, &init_cred),                 \
 193        RCU_POINTER_INITIALIZER(cred, &init_cred),                      \
 194        .comm           = INIT_TASK_COMM,                               \
 195        .thread         = INIT_THREAD,                                  \
 196        .fs             = &init_fs,                                     \
 197        .files          = &init_files,                                  \
 198        .signal         = &init_signals,                                \
 199        .sighand        = &init_sighand,                                \
 200        .nsproxy        = &init_nsproxy,                                \
 201        .pending        = {                                             \
 202                .list = LIST_HEAD_INIT(tsk.pending.list),               \
 203                .signal = {{0}}},                                       \
 204        .blocked        = {{0}},                                        \
 205        .alloc_lock     = __SPIN_LOCK_UNLOCKED(tsk.alloc_lock),         \
 206        .journal_info   = NULL,                                         \
 207        .cpu_timers     = INIT_CPU_TIMERS(tsk.cpu_timers),              \
 208        .pi_lock        = __RAW_SPIN_LOCK_UNLOCKED(tsk.pi_lock),        \
 209        .timer_slack_ns = 50000, /* 50 usec default slack */            \
 210        .pids = {                                                       \
 211                [PIDTYPE_PID]  = INIT_PID_LINK(PIDTYPE_PID),            \
 212                [PIDTYPE_PGID] = INIT_PID_LINK(PIDTYPE_PGID),           \
 213                [PIDTYPE_SID]  = INIT_PID_LINK(PIDTYPE_SID),            \
 214        },                                                              \
 215        .thread_group   = LIST_HEAD_INIT(tsk.thread_group),             \
 216        INIT_IDS                                                        \
 217        INIT_PERF_EVENTS(tsk)                                           \
 218        INIT_TRACE_IRQFLAGS                                             \
 219        INIT_LOCKDEP                                                    \
 220        INIT_FTRACE_GRAPH                                               \
 221        INIT_TRACE_RECURSION                                            \
 222        INIT_TASK_RCU_PREEMPT(tsk)                                      \
 223        INIT_CPUSET_SEQ                                                 \
 224        INIT_VTIME(tsk)                                                 \
 225}
 226
 227
 228#define INIT_CPU_TIMERS(cpu_timers)                                     \
 229{                                                                       \
 230        LIST_HEAD_INIT(cpu_timers[0]),                                  \
 231        LIST_HEAD_INIT(cpu_timers[1]),                                  \
 232        LIST_HEAD_INIT(cpu_timers[2]),                                  \
 233}
 234
 235/* Attach to the init_task data structure for proper alignment */
 236#define __init_task_data __attribute__((__section__(".data..init_task")))
 237
 238
 239#endif
 240
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