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 <linux/rbtree.h>
  15 #include <net/net_namespace.h>
  16 #include <linux/sched/rt.h>
  17
  18 #ifdef CONFIG_SMP
  19 # define INIT_PUSHABLE_TASKS(tsk)                                       \
  20         .pushable_tasks = PLIST_NODE_INIT(tsk.pushable_tasks, MAX_PRIO),
  21 #else
  22 # define INIT_PUSHABLE_TASKS(tsk)
  23 #endif
  24
  25 extern struct files_struct init_files;
  26 extern struct fs_struct init_fs;
  27
  28 #ifdef CONFIG_CGROUPS
  29 #define INIT_GROUP_RWSEM(sig)                                           \
  30         .group_rwsem = __RWSEM_INITIALIZER(sig.group_rwsem),
  31 #else
  32 #define INIT_GROUP_RWSEM(sig)
  33 #endif
  34
  35 #ifdef CONFIG_CPUSETS
  36 #define INIT_CPUSET_SEQ(tsk)                                                    \
  37         .mems_allowed_seq = SEQCNT_ZERO(tsk.mems_allowed_seq),
  38 #else
  39 #define INIT_CPUSET_SEQ(tsk)
  40 #endif
  41
  42 #define INIT_SIGNALS(sig) {                                             \
  43         .nr_threads     = 1,                                            \
  44         .thread_head    = LIST_HEAD_INIT(init_task.thread_node),        \
  45         .wait_chldexit  = __WAIT_QUEUE_HEAD_INITIALIZER(sig.wait_chldexit),\
  46         .shared_pending = {                                             \
  47                 .list = LIST_HEAD_INIT(sig.shared_pending.list),        \
  48                 .signal =  {{0}}},                                      \
  49         .posix_timers    = LIST_HEAD_INIT(sig.posix_timers),            \
  50         .cpu_timers     = INIT_CPU_TIMERS(sig.cpu_timers),              \
  51         .rlim           = INIT_RLIMITS,                                 \
  52         .cputimer       = {                                             \
  53                 .cputime = INIT_CPUTIME,                                \
  54                 .running = 0,                                           \
  55                 .lock = __RAW_SPIN_LOCK_UNLOCKED(sig.cputimer.lock),    \
  56         },                                                              \
  57         .cred_guard_mutex =                                             \
  58                  __MUTEX_INITIALIZER(sig.cred_guard_mutex),             \
  59         INIT_GROUP_RWSEM(sig)                                           \
  60 }
  61
  62 extern struct nsproxy init_nsproxy;
  63
  64 #define INIT_SIGHAND(sighand) {                                         \
  65         .count          = ATOMIC_INIT(1),                               \
  66         .action         = { { { .sa_handler = SIG_DFL, } }, },          \
  67         .siglock        = __SPIN_LOCK_UNLOCKED(sighand.siglock),        \
  68         .signalfd_wqh   = __WAIT_QUEUE_HEAD_INITIALIZER(sighand.signalfd_wqh),  \
  69 }
  70
  71 extern struct group_info init_groups;
  72
  73 #define INIT_STRUCT_PID {                                               \
  74         .count          = ATOMIC_INIT(1),                               \
  75         .tasks          = {                                             \
  76                 { .first = NULL },                                      \
  77                 { .first = NULL },                                      \
  78                 { .first = NULL },                                      \
  79         },                                                              \
  80         .level          = 0,                                            \
  81         .numbers        = { {                                           \
  82                 .nr             = 0,                                    \
  83                 .ns             = &init_pid_ns,                         \
  84                 .pid_chain      = { .next = NULL, .pprev = NULL },      \
  85         }, }                                                            \
  86 }
  87
  88 #define INIT_PID_LINK(type)                                     \
  89 {                                                               \
  90         .node = {                                               \
  91                 .next = NULL,                                   \
  92                 .pprev = NULL,                                  \
  93         },                                                      \
  94         .pid = &init_struct_pid,                                \
  95 }
  96
  97 #ifdef CONFIG_AUDITSYSCALL
  98 #define INIT_IDS \
  99         .loginuid = INVALID_UID, \
 100         .sessionid = (unsigned int)-1,
 101 #else
 102 #define INIT_IDS
 103 #endif
 104
 105 #ifdef CONFIG_PREEMPT_RCU
 106 #define INIT_TASK_RCU_TREE_PREEMPT()                                    \
 107         .rcu_blocked_node = NULL,
 108 #else
 109 #define INIT_TASK_RCU_TREE_PREEMPT(tsk)
 110 #endif
 111 #ifdef CONFIG_PREEMPT_RCU
 112 #define INIT_TASK_RCU_PREEMPT(tsk)                                      \
 113         .rcu_read_lock_nesting = 0,                                     \
 114         .rcu_read_unlock_special.s = 0,                                 \
 115         .rcu_node_entry = LIST_HEAD_INIT(tsk.rcu_node_entry),           \
 116         INIT_TASK_RCU_TREE_PREEMPT()
 117 #else
 118 #define INIT_TASK_RCU_PREEMPT(tsk)
 119 #endif
 120 #ifdef CONFIG_TASKS_RCU
 121 #define INIT_TASK_RCU_TASKS(tsk)                                        \
 122         .rcu_tasks_holdout = false,                                     \
 123         .rcu_tasks_holdout_list =                                       \
 124                 LIST_HEAD_INIT(tsk.rcu_tasks_holdout_list),             \
 125         .rcu_tasks_idle_cpu = -1,
 126 #else
 127 #define INIT_TASK_RCU_TASKS(tsk)
 128 #endif
 129
 130 extern struct cred init_cred;
 131
 132 extern struct task_group root_task_group;
 133
 134 #ifdef CONFIG_CGROUP_SCHED
 135 # define INIT_CGROUP_SCHED(tsk)                                         \
 136         .sched_task_group = &root_task_group,
 137 #else
 138 # define INIT_CGROUP_SCHED(tsk)
 139 #endif
 140
 141 #ifdef CONFIG_PERF_EVENTS
 142 # define INIT_PERF_EVENTS(tsk)                                          \
 143         .perf_event_mutex =                                             \
 144                  __MUTEX_INITIALIZER(tsk.perf_event_mutex),             \
 145         .perf_event_list = LIST_HEAD_INIT(tsk.perf_event_list),
 146 #else
 147 # define INIT_PERF_EVENTS(tsk)
 148 #endif
 149
 150 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
 151 # define INIT_VTIME(tsk)                                                \
 152         .vtime_seqlock = __SEQLOCK_UNLOCKED(tsk.vtime_seqlock), \
 153         .vtime_snap = 0,                                \
 154         .vtime_snap_whence = VTIME_SYS,
 155 #else
 156 # define INIT_VTIME(tsk)
 157 #endif
 158
 159 #define INIT_TASK_COMM "swapper"
 160
 161 #ifdef CONFIG_RT_MUTEXES
 162 # define INIT_RT_MUTEXES(tsk)                                           \
 163         .pi_waiters = RB_ROOT,                                          \
 164         .pi_waiters_leftmost = NULL,
 165 #else
 166 # define INIT_RT_MUTEXES(tsk)
 167 #endif
 168
 169 #ifdef CONFIG_NUMA_BALANCING
 170 # define INIT_NUMA_BALANCING(tsk)                                       \
 171         .numa_preferred_nid = -1,                                       \
 172         .numa_group = NULL,                                             \
 173         .numa_faults = NULL,
 174 #else
 175 # define INIT_NUMA_BALANCING(tsk)
 176 #endif
 177
 178 /*
 179  *  INIT_TASK is used to set up the first task table, touch at
 180  * your own risk!. Base=0, limit=0x1fffff (=2MB)
 181  */
 182 #define INIT_TASK(tsk)  \
 183 {                                                                       \
 184         .state          = 0,                                            \
 185         .stack          = &init_thread_info,                            \
 186         .usage          = ATOMIC_INIT(2),                               \
 187         .flags          = PF_KTHREAD,                                   \
 188         .prio           = MAX_PRIO-20,                                  \
 189         .static_prio    = MAX_PRIO-20,                                  \
 190         .normal_prio    = MAX_PRIO-20,                                  \
 191         .policy         = SCHED_NORMAL,                                 \
 192         .cpus_allowed   = CPU_MASK_ALL,                                 \
 193         .nr_cpus_allowed= NR_CPUS,                                      \
 194         .mm             = NULL,                                         \
 195         .active_mm      = &init_mm,                                     \
 196         .se             = {                                             \
 197                 .group_node     = LIST_HEAD_INIT(tsk.se.group_node),    \
 198         },                                                              \
 199         .rt             = {                                             \
 200                 .run_list       = LIST_HEAD_INIT(tsk.rt.run_list),      \
 201                 .time_slice     = RR_TIMESLICE,                         \
 202         },                                                              \
 203         .tasks          = LIST_HEAD_INIT(tsk.tasks),                    \
 204         INIT_PUSHABLE_TASKS(tsk)                                        \
 205         INIT_CGROUP_SCHED(tsk)                                          \
 206         .ptraced        = LIST_HEAD_INIT(tsk.ptraced),                  \
 207         .ptrace_entry   = LIST_HEAD_INIT(tsk.ptrace_entry),             \
 208         .real_parent    = &tsk,                                         \
 209         .parent         = &tsk,                                         \
 210         .children       = LIST_HEAD_INIT(tsk.children),                 \
 211         .sibling        = LIST_HEAD_INIT(tsk.sibling),                  \
 212         .group_leader   = &tsk,                                         \
 213         RCU_POINTER_INITIALIZER(real_cred, &init_cred),                 \
 214         RCU_POINTER_INITIALIZER(cred, &init_cred),                      \
 215         .comm           = INIT_TASK_COMM,                               \
 216         .thread         = INIT_THREAD,                                  \
 217         .fs             = &init_fs,                                     \
 218         .files          = &init_files,                                  \
 219         .signal         = &init_signals,                                \
 220         .sighand        = &init_sighand,                                \
 221         .nsproxy        = &init_nsproxy,                                \
 222         .pending        = {                                             \
 223                 .list = LIST_HEAD_INIT(tsk.pending.list),               \
 224                 .signal = {{0}}},                                       \
 225         .blocked        = {{0}},                                        \
 226         .alloc_lock     = __SPIN_LOCK_UNLOCKED(tsk.alloc_lock),         \
 227         .journal_info   = NULL,                                         \
 228         .cpu_timers     = INIT_CPU_TIMERS(tsk.cpu_timers),              \
 229         .pi_lock        = __RAW_SPIN_LOCK_UNLOCKED(tsk.pi_lock),        \
 230         .timer_slack_ns = 50000, /* 50 usec default slack */            \
 231         .pids = {                                                       \
 232                 [PIDTYPE_PID]  = INIT_PID_LINK(PIDTYPE_PID),            \
 233                 [PIDTYPE_PGID] = INIT_PID_LINK(PIDTYPE_PGID),           \
 234                 [PIDTYPE_SID]  = INIT_PID_LINK(PIDTYPE_SID),            \
 235         },                                                              \
 236         .thread_group   = LIST_HEAD_INIT(tsk.thread_group),             \
 237         .thread_node    = LIST_HEAD_INIT(init_signals.thread_head),     \
 238         INIT_IDS                                                        \
 239         INIT_PERF_EVENTS(tsk)                                           \
 240         INIT_TRACE_IRQFLAGS                                             \
 241         INIT_LOCKDEP                                                    \
 242         INIT_FTRACE_GRAPH                                               \
 243         INIT_TRACE_RECURSION                                            \
 244         INIT_TASK_RCU_PREEMPT(tsk)                                      \
 245         INIT_TASK_RCU_TASKS(tsk)                                        \
 246         INIT_CPUSET_SEQ(tsk)                                            \
 247         INIT_RT_MUTEXES(tsk)                                            \
 248         INIT_VTIME(tsk)                                                 \
 249         INIT_NUMA_BALANCING(tsk)                                        \
 250 }
 251
 252
 253 #define INIT_CPU_TIMERS(cpu_timers)                                     \
 254 {                                                                       \
 255         LIST_HEAD_INIT(cpu_timers[0]),                                  \
 256         LIST_HEAD_INIT(cpu_timers[1]),                                  \
 257         LIST_HEAD_INIT(cpu_timers[2]),                                  \
 258 }
 259
 260 /* Attach to the init_task data structure for proper alignment */
 261 #define __init_task_data __attribute__((__section__(".data..init_task")))
 262
 263
 264 #endif