include/linux/init_task.h

   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
  22 extern struct files_struct init_files;
  23 extern 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
  58 extern 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
  67 extern 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
 124 extern struct cred init_cred;
 125
 126 extern 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