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