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