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 #ifdef CONFIG_POSIX_TIMERS
  46 #define INIT_POSIX_TIMERS(s)                                            \
  47         .posix_timers = LIST_HEAD_INIT(s.posix_timers),
  48 #define INIT_CPU_TIMERS(s)                                              \
  49         .cpu_timers = {                                                 \
  50                 LIST_HEAD_INIT(s.cpu_timers[0]),                        \
  51                 LIST_HEAD_INIT(s.cpu_timers[1]),                        \
  52                 LIST_HEAD_INIT(s.cpu_timers[2]),                                                                \
  53         },
  54 #define INIT_CPUTIMER(s)                                                \
  55         .cputimer       = {                                             \
  56                 .cputime_atomic = INIT_CPUTIME_ATOMIC,                  \
  57                 .running        = false,                                \
  58                 .checking_timer = false,                                \
  59         },
  60 #else
  61 #define INIT_POSIX_TIMERS(s)
  62 #define INIT_CPU_TIMERS(s)
  63 #define INIT_CPUTIMER(s)
  64 #endif
  65
  66 #define INIT_SIGNALS(sig) {                                             \
  67         .nr_threads     = 1,                                            \
  68         .thread_head    = LIST_HEAD_INIT(init_task.thread_node),        \
  69         .wait_chldexit  = __WAIT_QUEUE_HEAD_INITIALIZER(sig.wait_chldexit),\
  70         .shared_pending = {                                             \
  71                 .list = LIST_HEAD_INIT(sig.shared_pending.list),        \
  72                 .signal =  {{0}}},                                      \
  73         INIT_POSIX_TIMERS(sig)                                          \
  74         INIT_CPU_TIMERS(sig)                                            \
  75         .rlim           = INIT_RLIMITS,                                 \
  76         INIT_CPUTIMER(sig)                                              \
  77         INIT_PREV_CPUTIME(sig)                                          \
  78         .cred_guard_mutex =                                             \
  79                  __MUTEX_INITIALIZER(sig.cred_guard_mutex),             \
  80 }
  81
  82 extern struct nsproxy init_nsproxy;
  83
  84 #define INIT_SIGHAND(sighand) {                                         \
  85         .count          = ATOMIC_INIT(1),                               \
  86         .action         = { { { .sa_handler = SIG_DFL, } }, },          \
  87         .siglock        = __SPIN_LOCK_UNLOCKED(sighand.siglock),        \
  88         .signalfd_wqh   = __WAIT_QUEUE_HEAD_INITIALIZER(sighand.signalfd_wqh),  \
  89 }
  90
  91 extern struct group_info init_groups;
  92
  93 #define INIT_STRUCT_PID {                                               \
  94         .count          = ATOMIC_INIT(1),                               \
  95         .tasks          = {                                             \
  96                 { .first = NULL },                                      \
  97                 { .first = NULL },                                      \
  98                 { .first = NULL },                                      \
  99         },                                                              \
 100         .level          = 0,                                            \
 101         .numbers        = { {                                           \
 102                 .nr             = 0,                                    \
 103                 .ns             = &init_pid_ns,                         \
 104                 .pid_chain      = { .next = NULL, .pprev = NULL },      \
 105         }, }                                                            \
 106 }
 107
 108 #define INIT_PID_LINK(type)                                     \
 109 {                                                               \
 110         .node = {                                               \
 111                 .next = NULL,                                   \
 112                 .pprev = NULL,                                  \
 113         },                                                      \
 114         .pid = &init_struct_pid,                                \
 115 }
 116
 117 #ifdef CONFIG_AUDITSYSCALL
 118 #define INIT_IDS \
 119         .loginuid = INVALID_UID, \
 120         .sessionid = (unsigned int)-1,
 121 #else
 122 #define INIT_IDS
 123 #endif
 124
 125 #ifdef CONFIG_PREEMPT_RCU
 126 #define INIT_TASK_RCU_TREE_PREEMPT()                                    \
 127         .rcu_blocked_node = NULL,
 128 #else
 129 #define INIT_TASK_RCU_TREE_PREEMPT(tsk)
 130 #endif
 131 #ifdef CONFIG_PREEMPT_RCU
 132 #define INIT_TASK_RCU_PREEMPT(tsk)                                      \
 133         .rcu_read_lock_nesting = 0,                                     \
 134         .rcu_read_unlock_special.s = 0,                                 \
 135         .rcu_node_entry = LIST_HEAD_INIT(tsk.rcu_node_entry),           \
 136         INIT_TASK_RCU_TREE_PREEMPT()
 137 #else
 138 #define INIT_TASK_RCU_PREEMPT(tsk)
 139 #endif
 140 #ifdef CONFIG_TASKS_RCU
 141 #define INIT_TASK_RCU_TASKS(tsk)                                        \
 142         .rcu_tasks_holdout = false,                                     \
 143         .rcu_tasks_holdout_list =                                       \
 144                 LIST_HEAD_INIT(tsk.rcu_tasks_holdout_list),             \
 145         .rcu_tasks_idle_cpu = -1,
 146 #else
 147 #define INIT_TASK_RCU_TASKS(tsk)
 148 #endif
 149
 150 extern struct cred init_cred;
 151
 152 extern struct task_group root_task_group;
 153
 154 #ifdef CONFIG_CGROUP_SCHED
 155 # define INIT_CGROUP_SCHED(tsk)                                         \
 156         .sched_task_group = &root_task_group,
 157 #else
 158 # define INIT_CGROUP_SCHED(tsk)
 159 #endif
 160
 161 #ifdef CONFIG_PERF_EVENTS
 162 # define INIT_PERF_EVENTS(tsk)                                          \
 163         .perf_event_mutex =                                             \
 164                  __MUTEX_INITIALIZER(tsk.perf_event_mutex),             \
 165         .perf_event_list = LIST_HEAD_INIT(tsk.perf_event_list),
 166 #else
 167 # define INIT_PERF_EVENTS(tsk)
 168 #endif
 169
 170 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
 171 # define INIT_VTIME(tsk)                                                \
 172         .vtime_seqcount = SEQCNT_ZERO(tsk.vtime_seqcount),      \
 173         .vtime_snap = 0,                                \
 174         .vtime_snap_whence = VTIME_SYS,
 175 #else
 176 # define INIT_VTIME(tsk)
 177 #endif
 178
 179 #define INIT_TASK_COMM "swapper"
 180
 181 #ifdef CONFIG_RT_MUTEXES
 182 # define INIT_RT_MUTEXES(tsk)                                           \
 183         .pi_waiters = RB_ROOT,                                          \
 184         .pi_waiters_leftmost = NULL,
 185 #else
 186 # define INIT_RT_MUTEXES(tsk)
 187 #endif
 188
 189 #ifdef CONFIG_NUMA_BALANCING
 190 # define INIT_NUMA_BALANCING(tsk)                                       \
 191         .numa_preferred_nid = -1,                                       \
 192         .numa_group = NULL,                                             \
 193         .numa_faults = NULL,
 194 #else
 195 # define INIT_NUMA_BALANCING(tsk)
 196 #endif
 197
 198 #ifdef CONFIG_KASAN
 199 # define INIT_KASAN(tsk)                                                \
 200         .kasan_depth = 1,
 201 #else
 202 # define INIT_KASAN(tsk)
 203 #endif
 204
 205 #ifdef CONFIG_THREAD_INFO_IN_TASK
 206 # define INIT_TASK_TI(tsk)                      \
 207         .thread_info = INIT_THREAD_INFO(tsk),   \
 208         .stack_refcount = ATOMIC_INIT(1),
 209 #else
 210 # define INIT_TASK_TI(tsk)
 211 #endif
 212
 213 /*
 214  *  INIT_TASK is used to set up the first task table, touch at
 215  * your own risk!. Base=0, limit=0x1fffff (=2MB)
 216  */
 217 #define INIT_TASK(tsk)  \
 218 {                                                                       \
 219         INIT_TASK_TI(tsk)                                               \
 220         .state          = 0,                                            \
 221         .stack          = init_stack,                                   \
 222         .usage          = ATOMIC_INIT(2),                               \
 223         .flags          = PF_KTHREAD,                                   \
 224         .prio           = MAX_PRIO-20,                                  \
 225         .static_prio    = MAX_PRIO-20,                                  \
 226         .normal_prio    = MAX_PRIO-20,                                  \
 227         .policy         = SCHED_NORMAL,                                 \
 228         .cpus_allowed   = CPU_MASK_ALL,                                 \
 229         .nr_cpus_allowed= NR_CPUS,                                      \
 230         .mm             = NULL,                                         \
 231         .active_mm      = &init_mm,                                     \
 232         .restart_block = {                                              \
 233                 .fn = do_no_restart_syscall,                            \
 234         },                                                              \
 235         .se             = {                                             \
 236                 .group_node     = LIST_HEAD_INIT(tsk.se.group_node),    \
 237         },                                                              \
 238         .rt             = {                                             \
 239                 .run_list       = LIST_HEAD_INIT(tsk.rt.run_list),      \
 240                 .time_slice     = RR_TIMESLICE,                         \
 241         },                                                              \
 242         .tasks          = LIST_HEAD_INIT(tsk.tasks),                    \
 243         INIT_PUSHABLE_TASKS(tsk)                                        \
 244         INIT_CGROUP_SCHED(tsk)                                          \
 245         .ptraced        = LIST_HEAD_INIT(tsk.ptraced),                  \
 246         .ptrace_entry   = LIST_HEAD_INIT(tsk.ptrace_entry),             \
 247         .real_parent    = &tsk,                                         \
 248         .parent         = &tsk,                                         \
 249         .children       = LIST_HEAD_INIT(tsk.children),                 \
 250         .sibling        = LIST_HEAD_INIT(tsk.sibling),                  \
 251         .group_leader   = &tsk,                                         \
 252         RCU_POINTER_INITIALIZER(real_cred, &init_cred),                 \
 253         RCU_POINTER_INITIALIZER(cred, &init_cred),                      \
 254         .comm           = INIT_TASK_COMM,                               \
 255         .thread         = INIT_THREAD,                                  \
 256         .fs             = &init_fs,                                     \
 257         .files          = &init_files,                                  \
 258         .signal         = &init_signals,                                \
 259         .sighand        = &init_sighand,                                \
 260         .nsproxy        = &init_nsproxy,                                \
 261         .pending        = {                                             \
 262                 .list = LIST_HEAD_INIT(tsk.pending.list),               \
 263                 .signal = {{0}}},                                       \
 264         .blocked        = {{0}},                                        \
 265         .alloc_lock     = __SPIN_LOCK_UNLOCKED(tsk.alloc_lock),         \
 266         .journal_info   = NULL,                                         \
 267         INIT_CPU_TIMERS(tsk)                                            \
 268         .pi_lock        = __RAW_SPIN_LOCK_UNLOCKED(tsk.pi_lock),        \
 269         .timer_slack_ns = 50000, /* 50 usec default slack */            \
 270         .pids = {                                                       \
 271                 [PIDTYPE_PID]  = INIT_PID_LINK(PIDTYPE_PID),            \
 272                 [PIDTYPE_PGID] = INIT_PID_LINK(PIDTYPE_PGID),           \
 273                 [PIDTYPE_SID]  = INIT_PID_LINK(PIDTYPE_SID),            \
 274         },                                                              \
 275         .thread_group   = LIST_HEAD_INIT(tsk.thread_group),             \
 276         .thread_node    = LIST_HEAD_INIT(init_signals.thread_head),     \
 277         INIT_IDS                                                        \
 278         INIT_PERF_EVENTS(tsk)                                           \
 279         INIT_TRACE_IRQFLAGS                                             \
 280         INIT_LOCKDEP                                                    \
 281         INIT_FTRACE_GRAPH                                               \
 282         INIT_TRACE_RECURSION                                            \
 283         INIT_TASK_RCU_PREEMPT(tsk)                                      \
 284         INIT_TASK_RCU_TASKS(tsk)                                        \
 285         INIT_CPUSET_SEQ(tsk)                                            \
 286         INIT_RT_MUTEXES(tsk)                                            \
 287         INIT_PREV_CPUTIME(tsk)                                          \
 288         INIT_VTIME(tsk)                                                 \
 289         INIT_NUMA_BALANCING(tsk)                                        \
 290         INIT_KASAN(tsk)                                                 \
 291 }
 292
 293
 294 /* Attach to the init_task data structure for proper alignment */
 295 #define __init_task_data __attribute__((__section__(".data..init_task")))
 296
 297
 298 #endif