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