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