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 <linux/sched/autogroup.h>
  16 #include <net/net_namespace.h>
  17 #include <linux/sched/rt.h>
  18
  19 #include <asm/thread_info.h>
  20
  21 #ifdef CONFIG_SMP
  22 # define INIT_PUSHABLE_TASKS(tsk)                                       \
  23         .pushable_tasks = PLIST_NODE_INIT(tsk.pushable_tasks, MAX_PRIO),
  24 #else
  25 # define INIT_PUSHABLE_TASKS(tsk)
  26 #endif
  27
  28 extern struct files_struct init_files;
  29 extern struct fs_struct init_fs;
  30
  31 #ifdef CONFIG_CPUSETS
  32 #define INIT_CPUSET_SEQ(tsk)                                                    \
  33         .mems_allowed_seq = SEQCNT_ZERO(tsk.mems_allowed_seq),
  34 #else
  35 #define INIT_CPUSET_SEQ(tsk)
  36 #endif
  37
  38 #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
  39 #define INIT_PREV_CPUTIME(x)    .prev_cputime = {                       \
  40         .lock = __RAW_SPIN_LOCK_UNLOCKED(x.prev_cputime.lock),          \
  41 },
  42 #else
  43 #define INIT_PREV_CPUTIME(x)
  44 #endif
  45
  46 #ifdef CONFIG_POSIX_TIMERS
  47 #define INIT_POSIX_TIMERS(s)                                            \
  48         .posix_timers = LIST_HEAD_INIT(s.posix_timers),
  49 #define INIT_CPU_TIMERS(s)                                              \
  50         .cpu_timers = {                                                 \
  51                 LIST_HEAD_INIT(s.cpu_timers[0]),                        \
  52                 LIST_HEAD_INIT(s.cpu_timers[1]),                        \
  53                 LIST_HEAD_INIT(s.cpu_timers[2]),                                                                \
  54         },
  55 #define INIT_CPUTIMER(s)                                                \
  56         .cputimer       = {                                             \
  57                 .cputime_atomic = INIT_CPUTIME_ATOMIC,                  \
  58                 .running        = false,                                \
  59                 .checking_timer = false,                                \
  60         },
  61 #else
  62 #define INIT_POSIX_TIMERS(s)
  63 #define INIT_CPU_TIMERS(s)
  64 #define INIT_CPUTIMER(s)
  65 #endif
  66
  67 #define INIT_SIGNALS(sig) {                                             \
  68         .nr_threads     = 1,                                            \
  69         .thread_head    = LIST_HEAD_INIT(init_task.thread_node),        \
  70         .wait_chldexit  = __WAIT_QUEUE_HEAD_INITIALIZER(sig.wait_chldexit),\
  71         .shared_pending = {                                             \
  72                 .list = LIST_HEAD_INIT(sig.shared_pending.list),        \
  73                 .signal =  {{0}}},                                      \
  74         INIT_POSIX_TIMERS(sig)                                          \
  75         INIT_CPU_TIMERS(sig)                                            \
  76         .rlim           = INIT_RLIMITS,                                 \
  77         INIT_CPUTIMER(sig)                                              \
  78         INIT_PREV_CPUTIME(sig)                                          \
  79         .cred_guard_mutex =                                             \
  80                  __MUTEX_INITIALIZER(sig.cred_guard_mutex),             \
  81 }
  82
  83 extern struct nsproxy init_nsproxy;
  84
  85 #define INIT_SIGHAND(sighand) {                                         \
  86         .count          = ATOMIC_INIT(1),                               \
  87         .action         = { { { .sa_handler = SIG_DFL, } }, },          \
  88         .siglock        = __SPIN_LOCK_UNLOCKED(sighand.siglock),        \
  89         .signalfd_wqh   = __WAIT_QUEUE_HEAD_INITIALIZER(sighand.signalfd_wqh),  \
  90 }
  91
  92 extern struct group_info init_groups;
  93
  94 #define INIT_STRUCT_PID {                                               \
  95         .count          = ATOMIC_INIT(1),                               \
  96         .tasks          = {                                             \
  97                 { .first = NULL },                                      \
  98                 { .first = NULL },                                      \
  99                 { .first = NULL },                                      \
 100         },                                                              \
 101         .level          = 0,                                            \
 102         .numbers        = { {                                           \
 103                 .nr             = 0,                                    \
 104                 .ns             = &init_pid_ns,                         \
 105                 .pid_chain      = { .next = NULL, .pprev = NULL },      \
 106         }, }                                                            \
 107 }
 108
 109 #define INIT_PID_LINK(type)                                     \
 110 {                                                               \
 111         .node = {                                               \
 112                 .next = NULL,                                   \
 113                 .pprev = NULL,                                  \
 114         },                                                      \
 115         .pid = &init_struct_pid,                                \
 116 }
 117
 118 #ifdef CONFIG_AUDITSYSCALL
 119 #define INIT_IDS \
 120         .loginuid = INVALID_UID, \
 121         .sessionid = (unsigned int)-1,
 122 #else
 123 #define INIT_IDS
 124 #endif
 125
 126 #ifdef CONFIG_PREEMPT_RCU
 127 #define INIT_TASK_RCU_TREE_PREEMPT()                                    \
 128         .rcu_blocked_node = NULL,
 129 #else
 130 #define INIT_TASK_RCU_TREE_PREEMPT(tsk)
 131 #endif
 132 #ifdef CONFIG_PREEMPT_RCU
 133 #define INIT_TASK_RCU_PREEMPT(tsk)                                      \
 134         .rcu_read_lock_nesting = 0,                                     \
 135         .rcu_read_unlock_special.s = 0,                                 \
 136         .rcu_node_entry = LIST_HEAD_INIT(tsk.rcu_node_entry),           \
 137         INIT_TASK_RCU_TREE_PREEMPT()
 138 #else
 139 #define INIT_TASK_RCU_PREEMPT(tsk)
 140 #endif
 141 #ifdef CONFIG_TASKS_RCU
 142 #define INIT_TASK_RCU_TASKS(tsk)                                        \
 143         .rcu_tasks_holdout = false,                                     \
 144         .rcu_tasks_holdout_list =                                       \
 145                 LIST_HEAD_INIT(tsk.rcu_tasks_holdout_list),             \
 146         .rcu_tasks_idle_cpu = -1,
 147 #else
 148 #define INIT_TASK_RCU_TASKS(tsk)
 149 #endif
 150
 151 extern struct cred init_cred;
 152
 153 extern struct task_group root_task_group;
 154
 155 #ifdef CONFIG_CGROUP_SCHED
 156 # define INIT_CGROUP_SCHED(tsk)                                         \
 157         .sched_task_group = &root_task_group,
 158 #else
 159 # define INIT_CGROUP_SCHED(tsk)
 160 #endif
 161
 162 #ifdef CONFIG_PERF_EVENTS
 163 # define INIT_PERF_EVENTS(tsk)                                          \
 164         .perf_event_mutex =                                             \
 165                  __MUTEX_INITIALIZER(tsk.perf_event_mutex),             \
 166         .perf_event_list = LIST_HEAD_INIT(tsk.perf_event_list),
 167 #else
 168 # define INIT_PERF_EVENTS(tsk)
 169 #endif
 170
 171 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
 172 # define INIT_VTIME(tsk)                                                \
 173         .vtime_seqcount = SEQCNT_ZERO(tsk.vtime_seqcount),      \
 174         .vtime_snap = 0,                                \
 175         .vtime_snap_whence = VTIME_SYS,
 176 #else
 177 # define INIT_VTIME(tsk)
 178 #endif
 179
 180 #define INIT_TASK_COMM "swapper"
 181
 182 #ifdef CONFIG_RT_MUTEXES
 183 # define INIT_RT_MUTEXES(tsk)                                           \
 184         .pi_waiters = RB_ROOT,                                          \
 185         .pi_waiters_leftmost = NULL,
 186 #else
 187 # define INIT_RT_MUTEXES(tsk)
 188 #endif
 189
 190 #ifdef CONFIG_NUMA_BALANCING
 191 # define INIT_NUMA_BALANCING(tsk)                                       \
 192         .numa_preferred_nid = -1,                                       \
 193         .numa_group = NULL,                                             \
 194         .numa_faults = NULL,
 195 #else
 196 # define INIT_NUMA_BALANCING(tsk)
 197 #endif
 198
 199 #ifdef CONFIG_KASAN
 200 # define INIT_KASAN(tsk)                                                \
 201         .kasan_depth = 1,
 202 #else
 203 # define INIT_KASAN(tsk)
 204 #endif
 205
 206 #ifdef CONFIG_THREAD_INFO_IN_TASK
 207 # define INIT_TASK_TI(tsk)                      \
 208         .thread_info = INIT_THREAD_INFO(tsk),   \
 209         .stack_refcount = ATOMIC_INIT(1),
 210 #else
 211 # define INIT_TASK_TI(tsk)
 212 #endif
 213
 214 /*
 215  *  INIT_TASK is used to set up the first task table, touch at
 216  * your own risk!. Base=0, limit=0x1fffff (=2MB)
 217  */
 218 #define INIT_TASK(tsk)  \
 219 {                                                                       \
 220         INIT_TASK_TI(tsk)                                               \
 221         .state          = 0,                                            \
 222         .stack          = init_stack,                                   \
 223         .usage          = ATOMIC_INIT(2),                               \
 224         .flags          = PF_KTHREAD,                                   \
 225         .prio           = MAX_PRIO-20,                                  \
 226         .static_prio    = MAX_PRIO-20,                                  \
 227         .normal_prio    = MAX_PRIO-20,                                  \
 228         .policy         = SCHED_NORMAL,                                 \
 229         .cpus_allowed   = CPU_MASK_ALL,                                 \
 230         .nr_cpus_allowed= NR_CPUS,                                      \
 231         .mm             = NULL,                                         \
 232         .active_mm      = &init_mm,                                     \
 233         .restart_block = {                                              \
 234                 .fn = do_no_restart_syscall,                            \
 235         },                                                              \
 236         .se             = {                                             \
 237                 .group_node     = LIST_HEAD_INIT(tsk.se.group_node),    \
 238         },                                                              \
 239         .rt             = {                                             \
 240                 .run_list       = LIST_HEAD_INIT(tsk.rt.run_list),      \
 241                 .time_slice     = RR_TIMESLICE,                         \
 242         },                                                              \
 243         .tasks          = LIST_HEAD_INIT(tsk.tasks),                    \
 244         INIT_PUSHABLE_TASKS(tsk)                                        \
 245         INIT_CGROUP_SCHED(tsk)                                          \
 246         .ptraced        = LIST_HEAD_INIT(tsk.ptraced),                  \
 247         .ptrace_entry   = LIST_HEAD_INIT(tsk.ptrace_entry),             \
 248         .real_parent    = &tsk,                                         \
 249         .parent         = &tsk,                                         \
 250         .children       = LIST_HEAD_INIT(tsk.children),                 \
 251         .sibling        = LIST_HEAD_INIT(tsk.sibling),                  \
 252         .group_leader   = &tsk,                                         \
 253         RCU_POINTER_INITIALIZER(real_cred, &init_cred),                 \
 254         RCU_POINTER_INITIALIZER(cred, &init_cred),                      \
 255         .comm           = INIT_TASK_COMM,                               \
 256         .thread         = INIT_THREAD,                                  \
 257         .fs             = &init_fs,                                     \
 258         .files          = &init_files,                                  \
 259         .signal         = &init_signals,                                \
 260         .sighand        = &init_sighand,                                \
 261         .nsproxy        = &init_nsproxy,                                \
 262         .pending        = {                                             \
 263                 .list = LIST_HEAD_INIT(tsk.pending.list),               \
 264                 .signal = {{0}}},                                       \
 265         .blocked        = {{0}},                                        \
 266         .alloc_lock     = __SPIN_LOCK_UNLOCKED(tsk.alloc_lock),         \
 267         .journal_info   = NULL,                                         \
 268         INIT_CPU_TIMERS(tsk)                                            \
 269         .pi_lock        = __RAW_SPIN_LOCK_UNLOCKED(tsk.pi_lock),        \
 270         .timer_slack_ns = 50000, /* 50 usec default slack */            \
 271         .pids = {                                                       \
 272                 [PIDTYPE_PID]  = INIT_PID_LINK(PIDTYPE_PID),            \
 273                 [PIDTYPE_PGID] = INIT_PID_LINK(PIDTYPE_PGID),           \
 274                 [PIDTYPE_SID]  = INIT_PID_LINK(PIDTYPE_SID),            \
 275         },                                                              \
 276         .thread_group   = LIST_HEAD_INIT(tsk.thread_group),             \
 277         .thread_node    = LIST_HEAD_INIT(init_signals.thread_head),     \
 278         INIT_IDS                                                        \
 279         INIT_PERF_EVENTS(tsk)                                           \
 280         INIT_TRACE_IRQFLAGS                                             \
 281         INIT_LOCKDEP                                                    \
 282         INIT_FTRACE_GRAPH                                               \
 283         INIT_TRACE_RECURSION                                            \
 284         INIT_TASK_RCU_PREEMPT(tsk)                                      \
 285         INIT_TASK_RCU_TASKS(tsk)                                        \
 286         INIT_CPUSET_SEQ(tsk)                                            \
 287         INIT_RT_MUTEXES(tsk)                                            \
 288         INIT_PREV_CPUTIME(tsk)                                          \
 289         INIT_VTIME(tsk)                                                 \
 290         INIT_NUMA_BALANCING(tsk)                                        \
 291         INIT_KASAN(tsk)                                                 \
 292 }
 293
 294
 295 /* Attach to the init_task data structure for proper alignment */
 296 #define __init_task_data __attribute__((__section__(".data..init_task")))
 297
 298
 299 #endif