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