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 <linux/seqlock.h>
  14 #include <net/net_namespace.h>
  15 #include <linux/sched/rt.h>
  16
  17 #ifdef CONFIG_SMP
  18 # define INIT_PUSHABLE_TASKS(tsk)                                       \
  19         .pushable_tasks = PLIST_NODE_INIT(tsk.pushable_tasks, MAX_PRIO),
  20 #else
  21 # define INIT_PUSHABLE_TASKS(tsk)
  22 #endif
  23
  24 extern struct files_struct init_files;
  25 extern struct fs_struct init_fs;
  26
  27 #ifdef CONFIG_CGROUPS
  28 #define INIT_GROUP_RWSEM(sig)                                           \
  29         .group_rwsem = __RWSEM_INITIALIZER(sig.group_rwsem),
  30 #else
  31 #define INIT_GROUP_RWSEM(sig)
  32 #endif
  33
  34 #ifdef CONFIG_CPUSETS
  35 #define INIT_CPUSET_SEQ                                                 \
  36         .mems_allowed_seq = SEQCNT_ZERO,
  37 #else
  38 #define INIT_CPUSET_SEQ
  39 #endif
  40
  41 #define INIT_SIGNALS(sig) {                                             \
  42         .nr_threads     = 1,                                            \
  43         .thread_head    = LIST_HEAD_INIT(init_task.thread_node),        \
  44         .wait_chldexit  = __WAIT_QUEUE_HEAD_INITIALIZER(sig.wait_chldexit),\
  45         .shared_pending = {                                             \
  46                 .list = LIST_HEAD_INIT(sig.shared_pending.list),        \
  47                 .signal =  {{0}}},                                      \
  48         .posix_timers    = LIST_HEAD_INIT(sig.posix_timers),            \
  49         .cpu_timers     = INIT_CPU_TIMERS(sig.cpu_timers),              \
  50         .rlim           = INIT_RLIMITS,                                 \
  51         .cputimer       = {                                             \
  52                 .cputime = INIT_CPUTIME,                                \
  53                 .running = 0,                                           \
  54                 .lock = __RAW_SPIN_LOCK_UNLOCKED(sig.cputimer.lock),    \
  55         },                                                              \
  56         .cred_guard_mutex =                                             \
  57                  __MUTEX_INITIALIZER(sig.cred_guard_mutex),             \
  58         INIT_GROUP_RWSEM(sig)                                           \
  59 }
  60
  61 extern struct nsproxy init_nsproxy;
  62
  63 #define INIT_SIGHAND(sighand) {                                         \
  64         .count          = ATOMIC_INIT(1),                               \
  65         .action         = { { { .sa_handler = SIG_DFL, } }, },          \
  66         .siglock        = __SPIN_LOCK_UNLOCKED(sighand.siglock),        \
  67         .signalfd_wqh   = __WAIT_QUEUE_HEAD_INITIALIZER(sighand.signalfd_wqh),  \
  68 }
  69
  70 extern struct group_info init_groups;
  71
  72 #define INIT_STRUCT_PID {                                               \
  73         .count          = ATOMIC_INIT(1),                               \
  74         .tasks          = {                                             \
  75                 { .first = NULL },                                      \
  76                 { .first = NULL },                                      \
  77                 { .first = NULL },                                      \
  78         },                                                              \
  79         .level          = 0,                                            \
  80         .numbers        = { {                                           \
  81                 .nr             = 0,                                    \
  82                 .ns             = &init_pid_ns,                         \
  83                 .pid_chain      = { .next = NULL, .pprev = NULL },      \
  84         }, }                                                            \
  85 }
  86
  87 #define INIT_PID_LINK(type)                                     \
  88 {                                                               \
  89         .node = {                                               \
  90                 .next = NULL,                                   \
  91                 .pprev = NULL,                                  \
  92         },                                                      \
  93         .pid = &init_struct_pid,                                \
  94 }
  95
  96 #ifdef CONFIG_AUDITSYSCALL
  97 #define INIT_IDS \
  98         .loginuid = INVALID_UID, \
  99         .sessionid = -1,
 100 #else
 101 #define INIT_IDS
 102 #endif
 103
 104 #ifdef CONFIG_RCU_BOOST
 105 #define INIT_TASK_RCU_BOOST()                                           \
 106         .rcu_boost_mutex = NULL,
 107 #else
 108 #define INIT_TASK_RCU_BOOST()
 109 #endif
 110 #ifdef CONFIG_TREE_PREEMPT_RCU
 111 #define INIT_TASK_RCU_TREE_PREEMPT()                                    \
 112         .rcu_blocked_node = NULL,
 113 #else
 114 #define INIT_TASK_RCU_TREE_PREEMPT(tsk)
 115 #endif
 116 #ifdef CONFIG_PREEMPT_RCU
 117 #define INIT_TASK_RCU_PREEMPT(tsk)                                      \
 118         .rcu_read_lock_nesting = 0,                                     \
 119         .rcu_read_unlock_special = 0,                                   \
 120         .rcu_node_entry = LIST_HEAD_INIT(tsk.rcu_node_entry),           \
 121         INIT_TASK_RCU_TREE_PREEMPT()                                    \
 122         INIT_TASK_RCU_BOOST()
 123 #else
 124 #define INIT_TASK_RCU_PREEMPT(tsk)
 125 #endif
 126
 127 extern struct cred init_cred;
 128
 129 extern struct task_group root_task_group;
 130
 131 #ifdef CONFIG_CGROUP_SCHED
 132 # define INIT_CGROUP_SCHED(tsk)                                         \
 133         .sched_task_group = &root_task_group,
 134 #else
 135 # define INIT_CGROUP_SCHED(tsk)
 136 #endif
 137
 138 #ifdef CONFIG_PERF_EVENTS
 139 # define INIT_PERF_EVENTS(tsk)                                          \
 140         .perf_event_mutex =                                             \
 141                  __MUTEX_INITIALIZER(tsk.perf_event_mutex),             \
 142         .perf_event_list = LIST_HEAD_INIT(tsk.perf_event_list),
 143 #else
 144 # define INIT_PERF_EVENTS(tsk)
 145 #endif
 146
 147 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
 148 # define INIT_VTIME(tsk)                                                \
 149         .vtime_seqlock = __SEQLOCK_UNLOCKED(tsk.vtime_seqlock), \
 150         .vtime_snap = 0,                                \
 151         .vtime_snap_whence = VTIME_SYS,
 152 #else
 153 # define INIT_VTIME(tsk)
 154 #endif
 155
 156 #define INIT_TASK_COMM "swapper"
 157
 158 /*
 159  *  INIT_TASK is used to set up the first task table, touch at
 160  * your own risk!. Base=0, limit=0x1fffff (=2MB)
 161  */
 162 #define INIT_TASK(tsk)  \
 163 {                                                                       \
 164         .state          = 0,                                            \
 165         .stack          = &init_thread_info,                            \
 166         .usage          = ATOMIC_INIT(2),                               \
 167         .flags          = PF_KTHREAD,                                   \
 168         .prio           = MAX_PRIO-20,                                  \
 169         .static_prio    = MAX_PRIO-20,                                  \
 170         .normal_prio    = MAX_PRIO-20,                                  \
 171         .policy         = SCHED_NORMAL,                                 \
 172         .cpus_allowed   = CPU_MASK_ALL,                                 \
 173         .nr_cpus_allowed= NR_CPUS,                                      \
 174         .mm             = NULL,                                         \
 175         .active_mm      = &init_mm,                                     \
 176         .se             = {                                             \
 177                 .group_node     = LIST_HEAD_INIT(tsk.se.group_node),    \
 178         },                                                              \
 179         .rt             = {                                             \
 180                 .run_list       = LIST_HEAD_INIT(tsk.rt.run_list),      \
 181                 .time_slice     = RR_TIMESLICE,                         \
 182         },                                                              \
 183         .tasks          = LIST_HEAD_INIT(tsk.tasks),                    \
 184         INIT_PUSHABLE_TASKS(tsk)                                        \
 185         INIT_CGROUP_SCHED(tsk)                                          \
 186         .ptraced        = LIST_HEAD_INIT(tsk.ptraced),                  \
 187         .ptrace_entry   = LIST_HEAD_INIT(tsk.ptrace_entry),             \
 188         .real_parent    = &tsk,                                         \
 189         .parent         = &tsk,                                         \
 190         .children       = LIST_HEAD_INIT(tsk.children),                 \
 191         .sibling        = LIST_HEAD_INIT(tsk.sibling),                  \
 192         .group_leader   = &tsk,                                         \
 193         RCU_POINTER_INITIALIZER(real_cred, &init_cred),                 \
 194         RCU_POINTER_INITIALIZER(cred, &init_cred),                      \
 195         .comm           = INIT_TASK_COMM,                               \
 196         .thread         = INIT_THREAD,                                  \
 197         .fs             = &init_fs,                                     \
 198         .files          = &init_files,                                  \
 199         .signal         = &init_signals,                                \
 200         .sighand        = &init_sighand,                                \
 201         .nsproxy        = &init_nsproxy,                                \
 202         .pending        = {                                             \
 203                 .list = LIST_HEAD_INIT(tsk.pending.list),               \
 204                 .signal = {{0}}},                                       \
 205         .blocked        = {{0}},                                        \
 206         .alloc_lock     = __SPIN_LOCK_UNLOCKED(tsk.alloc_lock),         \
 207         .journal_info   = NULL,                                         \
 208         .cpu_timers     = INIT_CPU_TIMERS(tsk.cpu_timers),              \
 209         .pi_lock        = __RAW_SPIN_LOCK_UNLOCKED(tsk.pi_lock),        \
 210         .timer_slack_ns = 50000, /* 50 usec default slack */            \
 211         .pids = {                                                       \
 212                 [PIDTYPE_PID]  = INIT_PID_LINK(PIDTYPE_PID),            \
 213                 [PIDTYPE_PGID] = INIT_PID_LINK(PIDTYPE_PGID),           \
 214                 [PIDTYPE_SID]  = INIT_PID_LINK(PIDTYPE_SID),            \
 215         },                                                              \
 216         .thread_group   = LIST_HEAD_INIT(tsk.thread_group),             \
 217         .thread_node    = LIST_HEAD_INIT(init_signals.thread_head),     \
 218         INIT_IDS                                                        \
 219         INIT_PERF_EVENTS(tsk)                                           \
 220         INIT_TRACE_IRQFLAGS                                             \
 221         INIT_LOCKDEP                                                    \
 222         INIT_FTRACE_GRAPH                                               \
 223         INIT_TRACE_RECURSION                                            \
 224         INIT_TASK_RCU_PREEMPT(tsk)                                      \
 225         INIT_CPUSET_SEQ                                                 \
 226         INIT_VTIME(tsk)                                                 \
 227 }
 228
 229
 230 #define INIT_CPU_TIMERS(cpu_timers)                                     \
 231 {                                                                       \
 232         LIST_HEAD_INIT(cpu_timers[0]),                                  \
 233         LIST_HEAD_INIT(cpu_timers[1]),                                  \
 234         LIST_HEAD_INIT(cpu_timers[2]),                                  \
 235 }
 236
 237 /* Attach to the init_task data structure for proper alignment */
 238 #define __init_task_data __attribute__((__section__(".data..init_task")))
 239
 240
 241 #endif