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