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 #include <asm/thread_info.h>
  19
  20 #ifdef CONFIG_SMP
  21 # define INIT_PUSHABLE_TASKS(tsk)                                       \
  22         .pushable_tasks = PLIST_NODE_INIT(tsk.pushable_tasks, MAX_PRIO),
  23 #else
  24 # define INIT_PUSHABLE_TASKS(tsk)
  25 #endif
  26
  27 extern struct files_struct init_files;
  28 extern struct fs_struct init_fs;
  29
  30 #ifdef CONFIG_CPUSETS
  31 #define INIT_CPUSET_SEQ(tsk)                                                    \
  32         .mems_allowed_seq = SEQCNT_ZERO(tsk.mems_allowed_seq),
  33 #else
  34 #define INIT_CPUSET_SEQ(tsk)
  35 #endif
  36
  37 #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
  38 #define INIT_PREV_CPUTIME(x)    .prev_cputime = {                       \
  39         .lock = __RAW_SPIN_LOCK_UNLOCKED(x.prev_cputime.lock),          \
  40 },
  41 #else
  42 #define INIT_PREV_CPUTIME(x)
  43 #endif
  44
  45 #define INIT_SIGNALS(sig) {                                             \
  46         .nr_threads     = 1,                                            \
  47         .thread_head    = LIST_HEAD_INIT(init_task.thread_node),        \
  48         .wait_chldexit  = __WAIT_QUEUE_HEAD_INITIALIZER(sig.wait_chldexit),\
  49         .shared_pending = {                                             \
  50                 .list = LIST_HEAD_INIT(sig.shared_pending.list),        \
  51                 .signal =  {{0}}},                                      \
  52         .posix_timers    = LIST_HEAD_INIT(sig.posix_timers),            \
  53         .cpu_timers     = INIT_CPU_TIMERS(sig.cpu_timers),              \
  54         .rlim           = INIT_RLIMITS,                                 \
  55         .cputimer       = {                                             \
  56                 .cputime_atomic = INIT_CPUTIME_ATOMIC,                  \
  57                 .running        = false,                                \
  58                 .checking_timer = false,                                \
  59         },                                                              \
  60         INIT_PREV_CPUTIME(sig)                                          \
  61         .cred_guard_mutex =                                             \
  62                  __MUTEX_INITIALIZER(sig.cred_guard_mutex),             \
  63 }
  64
  65 extern struct nsproxy init_nsproxy;
  66
  67 #define INIT_SIGHAND(sighand) {                                         \
  68         .count          = ATOMIC_INIT(1),                               \
  69         .action         = { { { .sa_handler = SIG_DFL, } }, },          \
  70         .siglock        = __SPIN_LOCK_UNLOCKED(sighand.siglock),        \
  71         .signalfd_wqh   = __WAIT_QUEUE_HEAD_INITIALIZER(sighand.signalfd_wqh),  \
  72 }
  73
  74 extern struct group_info init_groups;
  75
  76 #define INIT_STRUCT_PID {                                               \
  77         .count          = ATOMIC_INIT(1),                               \
  78         .tasks          = {                                             \
  79                 { .first = NULL },                                      \
  80                 { .first = NULL },                                      \
  81                 { .first = NULL },                                      \
  82         },                                                              \
  83         .level          = 0,                                            \
  84         .numbers        = { {                                           \
  85                 .nr             = 0,                                    \
  86                 .ns             = &init_pid_ns,                         \
  87                 .pid_chain      = { .next = NULL, .pprev = NULL },      \
  88         }, }                                                            \
  89 }
  90
  91 #define INIT_PID_LINK(type)                                     \
  92 {                                                               \
  93         .node = {                                               \
  94                 .next = NULL,                                   \
  95                 .pprev = NULL,                                  \
  96         },                                                      \
  97         .pid = &init_struct_pid,                                \
  98 }
  99
 100 #ifdef CONFIG_AUDITSYSCALL
 101 #define INIT_IDS \
 102         .loginuid = INVALID_UID, \
 103         .sessionid = (unsigned int)-1,
 104 #else
 105 #define INIT_IDS
 106 #endif
 107
 108 #ifdef CONFIG_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.s = 0,                                 \
 118         .rcu_node_entry = LIST_HEAD_INIT(tsk.rcu_node_entry),           \
 119         INIT_TASK_RCU_TREE_PREEMPT()
 120 #else
 121 #define INIT_TASK_RCU_PREEMPT(tsk)
 122 #endif
 123 #ifdef CONFIG_TASKS_RCU
 124 #define INIT_TASK_RCU_TASKS(tsk)                                        \
 125         .rcu_tasks_holdout = false,                                     \
 126         .rcu_tasks_holdout_list =                                       \
 127                 LIST_HEAD_INIT(tsk.rcu_tasks_holdout_list),             \
 128         .rcu_tasks_idle_cpu = -1,
 129 #else
 130 #define INIT_TASK_RCU_TASKS(tsk)
 131 #endif
 132
 133 extern struct cred init_cred;
 134
 135 extern struct task_group root_task_group;
 136
 137 #ifdef CONFIG_CGROUP_SCHED
 138 # define INIT_CGROUP_SCHED(tsk)                                         \
 139         .sched_task_group = &root_task_group,
 140 #else
 141 # define INIT_CGROUP_SCHED(tsk)
 142 #endif
 143
 144 #ifdef CONFIG_PERF_EVENTS
 145 # define INIT_PERF_EVENTS(tsk)                                          \
 146         .perf_event_mutex =                                             \
 147                  __MUTEX_INITIALIZER(tsk.perf_event_mutex),             \
 148         .perf_event_list = LIST_HEAD_INIT(tsk.perf_event_list),
 149 #else
 150 # define INIT_PERF_EVENTS(tsk)
 151 #endif
 152
 153 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
 154 # define INIT_VTIME(tsk)                                                \
 155         .vtime_seqcount = SEQCNT_ZERO(tsk.vtime_seqcount),      \
 156         .vtime_snap = 0,                                \
 157         .vtime_snap_whence = VTIME_SYS,
 158 #else
 159 # define INIT_VTIME(tsk)
 160 #endif
 161
 162 #define INIT_TASK_COMM "swapper"
 163
 164 #ifdef CONFIG_RT_MUTEXES
 165 # define INIT_RT_MUTEXES(tsk)                                           \
 166         .pi_waiters = RB_ROOT,                                          \
 167         .pi_waiters_leftmost = NULL,
 168 #else
 169 # define INIT_RT_MUTEXES(tsk)
 170 #endif
 171
 172 #ifdef CONFIG_NUMA_BALANCING
 173 # define INIT_NUMA_BALANCING(tsk)                                       \
 174         .numa_preferred_nid = -1,                                       \
 175         .numa_group = NULL,                                             \
 176         .numa_faults = NULL,
 177 #else
 178 # define INIT_NUMA_BALANCING(tsk)
 179 #endif
 180
 181 #ifdef CONFIG_KASAN
 182 # define INIT_KASAN(tsk)                                                \
 183         .kasan_depth = 1,
 184 #else
 185 # define INIT_KASAN(tsk)
 186 #endif
 187
 188 #ifdef CONFIG_THREAD_INFO_IN_TASK
 189 # define INIT_TASK_TI(tsk)                      \
 190         .thread_info = INIT_THREAD_INFO(tsk),   \
 191         .stack_refcount = ATOMIC_INIT(1),
 192 #else
 193 # define INIT_TASK_TI(tsk)
 194 #endif
 195
 196 /*
 197  *  INIT_TASK is used to set up the first task table, touch at
 198  * your own risk!. Base=0, limit=0x1fffff (=2MB)
 199  */
 200 #define INIT_TASK(tsk)  \
 201 {                                                                       \
 202         INIT_TASK_TI(tsk)                                               \
 203         .state          = 0,                                            \
 204         .stack          = init_stack,                                   \
 205         .usage          = ATOMIC_INIT(2),                               \
 206         .flags          = PF_KTHREAD,                                   \
 207         .prio           = MAX_PRIO-20,                                  \
 208         .static_prio    = MAX_PRIO-20,                                  \
 209         .normal_prio    = MAX_PRIO-20,                                  \
 210         .policy         = SCHED_NORMAL,                                 \
 211         .cpus_allowed   = CPU_MASK_ALL,                                 \
 212         .nr_cpus_allowed= NR_CPUS,                                      \
 213         .mm             = NULL,                                         \
 214         .active_mm      = &init_mm,                                     \
 215         .restart_block = {                                              \
 216                 .fn = do_no_restart_syscall,                            \
 217         },                                                              \
 218         .se             = {                                             \
 219                 .group_node     = LIST_HEAD_INIT(tsk.se.group_node),    \
 220         },                                                              \
 221         .rt             = {                                             \
 222                 .run_list       = LIST_HEAD_INIT(tsk.rt.run_list),      \
 223                 .time_slice     = RR_TIMESLICE,                         \
 224         },                                                              \
 225         .tasks          = LIST_HEAD_INIT(tsk.tasks),                    \
 226         INIT_PUSHABLE_TASKS(tsk)                                        \
 227         INIT_CGROUP_SCHED(tsk)                                          \
 228         .ptraced        = LIST_HEAD_INIT(tsk.ptraced),                  \
 229         .ptrace_entry   = LIST_HEAD_INIT(tsk.ptrace_entry),             \
 230         .real_parent    = &tsk,                                         \
 231         .parent         = &tsk,                                         \
 232         .children       = LIST_HEAD_INIT(tsk.children),                 \
 233         .sibling        = LIST_HEAD_INIT(tsk.sibling),                  \
 234         .group_leader   = &tsk,                                         \
 235         RCU_POINTER_INITIALIZER(real_cred, &init_cred),                 \
 236         RCU_POINTER_INITIALIZER(cred, &init_cred),                      \
 237         .comm           = INIT_TASK_COMM,                               \
 238         .thread         = INIT_THREAD,                                  \
 239         .fs             = &init_fs,                                     \
 240         .files          = &init_files,                                  \
 241         .signal         = &init_signals,                                \
 242         .sighand        = &init_sighand,                                \
 243         .nsproxy        = &init_nsproxy,                                \
 244         .pending        = {                                             \
 245                 .list = LIST_HEAD_INIT(tsk.pending.list),               \
 246                 .signal = {{0}}},                                       \
 247         .blocked        = {{0}},                                        \
 248         .alloc_lock     = __SPIN_LOCK_UNLOCKED(tsk.alloc_lock),         \
 249         .journal_info   = NULL,                                         \
 250         .cpu_timers     = INIT_CPU_TIMERS(tsk.cpu_timers),              \
 251         .pi_lock        = __RAW_SPIN_LOCK_UNLOCKED(tsk.pi_lock),        \
 252         .timer_slack_ns = 50000, /* 50 usec default slack */            \
 253         .pids = {                                                       \
 254                 [PIDTYPE_PID]  = INIT_PID_LINK(PIDTYPE_PID),            \
 255                 [PIDTYPE_PGID] = INIT_PID_LINK(PIDTYPE_PGID),           \
 256                 [PIDTYPE_SID]  = INIT_PID_LINK(PIDTYPE_SID),            \
 257         },                                                              \
 258         .thread_group   = LIST_HEAD_INIT(tsk.thread_group),             \
 259         .thread_node    = LIST_HEAD_INIT(init_signals.thread_head),     \
 260         INIT_IDS                                                        \
 261         INIT_PERF_EVENTS(tsk)                                           \
 262         INIT_TRACE_IRQFLAGS                                             \
 263         INIT_LOCKDEP                                                    \
 264         INIT_FTRACE_GRAPH                                               \
 265         INIT_TRACE_RECURSION                                            \
 266         INIT_TASK_RCU_PREEMPT(tsk)                                      \
 267         INIT_TASK_RCU_TASKS(tsk)                                        \
 268         INIT_CPUSET_SEQ(tsk)                                            \
 269         INIT_RT_MUTEXES(tsk)                                            \
 270         INIT_PREV_CPUTIME(tsk)                                          \
 271         INIT_VTIME(tsk)                                                 \
 272         INIT_NUMA_BALANCING(tsk)                                        \
 273         INIT_KASAN(tsk)                                                 \
 274 }
 275
 276
 277 #define INIT_CPU_TIMERS(cpu_timers)                                     \
 278 {                                                                       \
 279         LIST_HEAD_INIT(cpu_timers[0]),                                  \
 280         LIST_HEAD_INIT(cpu_timers[1]),                                  \
 281         LIST_HEAD_INIT(cpu_timers[2]),                                  \
 282 }
 283
 284 /* Attach to the init_task data structure for proper alignment */
 285 #define __init_task_data __attribute__((__section__(".data..init_task")))
 286
 287
 288 #endif