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