Linux Kernel  3.7.1
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init_task.h
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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 <net/net_namespace.h>
14 
15 #ifdef CONFIG_SMP
16 # define INIT_PUSHABLE_TASKS(tsk) \
17  .pushable_tasks = PLIST_NODE_INIT(tsk.pushable_tasks, MAX_PRIO),
18 #else
19 # define INIT_PUSHABLE_TASKS(tsk)
20 #endif
21 
22 extern struct files_struct init_files;
23 extern struct fs_struct init_fs;
24 
25 #ifdef CONFIG_CGROUPS
26 #define INIT_GROUP_RWSEM(sig) \
27  .group_rwsem = __RWSEM_INITIALIZER(sig.group_rwsem),
28 #else
29 #define INIT_GROUP_RWSEM(sig)
30 #endif
31 
32 #ifdef CONFIG_CPUSETS
33 #define INIT_CPUSET_SEQ \
34  .mems_allowed_seq = SEQCNT_ZERO,
35 #else
36 #define INIT_CPUSET_SEQ
37 #endif
38 
39 #define INIT_SIGNALS(sig) { \
40  .nr_threads = 1, \
41  .wait_chldexit = __WAIT_QUEUE_HEAD_INITIALIZER(sig.wait_chldexit),\
42  .shared_pending = { \
43  .list = LIST_HEAD_INIT(sig.shared_pending.list), \
44  .signal = {{0}}}, \
45  .posix_timers = LIST_HEAD_INIT(sig.posix_timers), \
46  .cpu_timers = INIT_CPU_TIMERS(sig.cpu_timers), \
47  .rlim = INIT_RLIMITS, \
48  .cputimer = { \
49  .cputime = INIT_CPUTIME, \
50  .running = 0, \
51  .lock = __RAW_SPIN_LOCK_UNLOCKED(sig.cputimer.lock), \
52  }, \
53  .cred_guard_mutex = \
54  __MUTEX_INITIALIZER(sig.cred_guard_mutex), \
55  INIT_GROUP_RWSEM(sig) \
56 }
57 
58 extern struct nsproxy init_nsproxy;
59 
60 #define INIT_SIGHAND(sighand) { \
61  .count = ATOMIC_INIT(1), \
62  .action = { { { .sa_handler = SIG_DFL, } }, }, \
63  .siglock = __SPIN_LOCK_UNLOCKED(sighand.siglock), \
64  .signalfd_wqh = __WAIT_QUEUE_HEAD_INITIALIZER(sighand.signalfd_wqh), \
65 }
66 
67 extern struct group_info init_groups;
68 
69 #define INIT_STRUCT_PID { \
70  .count = ATOMIC_INIT(1), \
71  .tasks = { \
72  { .first = NULL }, \
73  { .first = NULL }, \
74  { .first = NULL }, \
75  }, \
76  .level = 0, \
77  .numbers = { { \
78  .nr = 0, \
79  .ns = &init_pid_ns, \
80  .pid_chain = { .next = NULL, .pprev = NULL }, \
81  }, } \
82 }
83 
84 #define INIT_PID_LINK(type) \
85 { \
86  .node = { \
87  .next = NULL, \
88  .pprev = NULL, \
89  }, \
90  .pid = &init_struct_pid, \
91 }
92 
93 #ifdef CONFIG_AUDITSYSCALL
94 #define INIT_IDS \
95  .loginuid = INVALID_UID, \
96  .sessionid = -1,
97 #else
98 #define INIT_IDS
99 #endif
100 
101 #ifdef CONFIG_RCU_BOOST
102 #define INIT_TASK_RCU_BOOST() \
103  .rcu_boost_mutex = NULL,
104 #else
105 #define INIT_TASK_RCU_BOOST()
106 #endif
107 #ifdef CONFIG_TREE_PREEMPT_RCU
108 #define INIT_TASK_RCU_TREE_PREEMPT() \
109  .rcu_blocked_node = NULL,
110 #else
111 #define INIT_TASK_RCU_TREE_PREEMPT(tsk)
112 #endif
113 #ifdef CONFIG_PREEMPT_RCU
114 #define INIT_TASK_RCU_PREEMPT(tsk) \
115  .rcu_read_lock_nesting = 0, \
116  .rcu_read_unlock_special = 0, \
117  .rcu_node_entry = LIST_HEAD_INIT(tsk.rcu_node_entry), \
118  INIT_TASK_RCU_TREE_PREEMPT() \
119  INIT_TASK_RCU_BOOST()
120 #else
121 #define INIT_TASK_RCU_PREEMPT(tsk)
122 #endif
123 
124 extern struct cred init_cred;
125 
126 extern struct task_group root_task_group;
127 
128 #ifdef CONFIG_CGROUP_SCHED
129 # define INIT_CGROUP_SCHED(tsk) \
130  .sched_task_group = &root_task_group,
131 #else
132 # define INIT_CGROUP_SCHED(tsk)
133 #endif
134 
135 #ifdef CONFIG_PERF_EVENTS
136 # define INIT_PERF_EVENTS(tsk) \
137  .perf_event_mutex = \
138  __MUTEX_INITIALIZER(tsk.perf_event_mutex), \
139  .perf_event_list = LIST_HEAD_INIT(tsk.perf_event_list),
140 #else
141 # define INIT_PERF_EVENTS(tsk)
142 #endif
143 
144 #define INIT_TASK_COMM "swapper"
145 
146 /*
147  * INIT_TASK is used to set up the first task table, touch at
148  * your own risk!. Base=0, limit=0x1fffff (=2MB)
149  */
150 #define INIT_TASK(tsk) \
151 { \
152  .state = 0, \
153  .stack = &init_thread_info, \
154  .usage = ATOMIC_INIT(2), \
155  .flags = PF_KTHREAD, \
156  .prio = MAX_PRIO-20, \
157  .static_prio = MAX_PRIO-20, \
158  .normal_prio = MAX_PRIO-20, \
159  .policy = SCHED_NORMAL, \
160  .cpus_allowed = CPU_MASK_ALL, \
161  .nr_cpus_allowed= NR_CPUS, \
162  .mm = NULL, \
163  .active_mm = &init_mm, \
164  .se = { \
165  .group_node = LIST_HEAD_INIT(tsk.se.group_node), \
166  }, \
167  .rt = { \
168  .run_list = LIST_HEAD_INIT(tsk.rt.run_list), \
169  .time_slice = RR_TIMESLICE, \
170  }, \
171  .tasks = LIST_HEAD_INIT(tsk.tasks), \
172  INIT_PUSHABLE_TASKS(tsk) \
173  INIT_CGROUP_SCHED(tsk) \
174  .ptraced = LIST_HEAD_INIT(tsk.ptraced), \
175  .ptrace_entry = LIST_HEAD_INIT(tsk.ptrace_entry), \
176  .real_parent = &tsk, \
177  .parent = &tsk, \
178  .children = LIST_HEAD_INIT(tsk.children), \
179  .sibling = LIST_HEAD_INIT(tsk.sibling), \
180  .group_leader = &tsk, \
181  RCU_POINTER_INITIALIZER(real_cred, &init_cred), \
182  RCU_POINTER_INITIALIZER(cred, &init_cred), \
183  .comm = INIT_TASK_COMM, \
184  .thread = INIT_THREAD, \
185  .fs = &init_fs, \
186  .files = &init_files, \
187  .signal = &init_signals, \
188  .sighand = &init_sighand, \
189  .nsproxy = &init_nsproxy, \
190  .pending = { \
191  .list = LIST_HEAD_INIT(tsk.pending.list), \
192  .signal = {{0}}}, \
193  .blocked = {{0}}, \
194  .alloc_lock = __SPIN_LOCK_UNLOCKED(tsk.alloc_lock), \
195  .journal_info = NULL, \
196  .cpu_timers = INIT_CPU_TIMERS(tsk.cpu_timers), \
197  .pi_lock = __RAW_SPIN_LOCK_UNLOCKED(tsk.pi_lock), \
198  .timer_slack_ns = 50000, /* 50 usec default slack */ \
199  .pids = { \
200  [PIDTYPE_PID] = INIT_PID_LINK(PIDTYPE_PID), \
201  [PIDTYPE_PGID] = INIT_PID_LINK(PIDTYPE_PGID), \
202  [PIDTYPE_SID] = INIT_PID_LINK(PIDTYPE_SID), \
203  }, \
204  .thread_group = LIST_HEAD_INIT(tsk.thread_group), \
205  INIT_IDS \
206  INIT_PERF_EVENTS(tsk) \
207  INIT_TRACE_IRQFLAGS \
208  INIT_LOCKDEP \
209  INIT_FTRACE_GRAPH \
210  INIT_TRACE_RECURSION \
211  INIT_TASK_RCU_PREEMPT(tsk) \
212  INIT_CPUSET_SEQ \
213 }
214 
215 
216 #define INIT_CPU_TIMERS(cpu_timers) \
217 { \
218  LIST_HEAD_INIT(cpu_timers[0]), \
219  LIST_HEAD_INIT(cpu_timers[1]), \
220  LIST_HEAD_INIT(cpu_timers[2]), \
221 }
222 
223 /* Attach to the init_task data structure for proper alignment */
224 #define __init_task_data __attribute__((__section__(".data..init_task")))
225 
226 
227 #endif
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