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1 | /* |
2 | * stop-task scheduling class. |
3 | * |
4 | * The stop task is the highest priority task in the system, it preempts |
5 | * everything and will be preempted by nothing. |
6 | * |
7 | * See kernel/stop_machine.c |
8 | */ |
9 | |
10 | #ifdef CONFIG_SMP |
11 | static int |
12 | select_task_rq_stop(struct task_struct *p, int sd_flag, int flags) |
13 | { |
14 | return task_cpu(p); /* stop tasks as never migrate */ |
15 | } |
16 | #endif /* CONFIG_SMP */ |
17 | |
18 | static void |
19 | check_preempt_curr_stop(struct rq *rq, struct task_struct *p, int flags) |
20 | { |
21 | /* we're never preempted */ |
22 | } |
23 | |
24 | static struct task_struct *pick_next_task_stop(struct rq *rq) |
25 | { |
26 | struct task_struct *stop = rq->stop; |
27 | |
28 | if (stop && stop->on_rq) |
29 | return stop; |
30 | |
31 | return NULL; |
32 | } |
33 | |
34 | static void |
35 | enqueue_task_stop(struct rq *rq, struct task_struct *p, int flags) |
36 | { |
37 | inc_nr_running(rq); |
38 | } |
39 | |
40 | static void |
41 | dequeue_task_stop(struct rq *rq, struct task_struct *p, int flags) |
42 | { |
43 | dec_nr_running(rq); |
44 | } |
45 | |
46 | static void yield_task_stop(struct rq *rq) |
47 | { |
48 | BUG(); /* the stop task should never yield, its pointless. */ |
49 | } |
50 | |
51 | static void put_prev_task_stop(struct rq *rq, struct task_struct *prev) |
52 | { |
53 | } |
54 | |
55 | static void task_tick_stop(struct rq *rq, struct task_struct *curr, int queued) |
56 | { |
57 | } |
58 | |
59 | static void set_curr_task_stop(struct rq *rq) |
60 | { |
61 | } |
62 | |
63 | static void switched_to_stop(struct rq *rq, struct task_struct *p) |
64 | { |
65 | BUG(); /* its impossible to change to this class */ |
66 | } |
67 | |
68 | static void |
69 | prio_changed_stop(struct rq *rq, struct task_struct *p, int oldprio) |
70 | { |
71 | BUG(); /* how!?, what priority? */ |
72 | } |
73 | |
74 | static unsigned int |
75 | get_rr_interval_stop(struct rq *rq, struct task_struct *task) |
76 | { |
77 | return 0; |
78 | } |
79 | |
80 | /* |
81 | * Simple, special scheduling class for the per-CPU stop tasks: |
82 | */ |
83 | static const struct sched_class stop_sched_class = { |
84 | .next = &rt_sched_class, |
85 | |
86 | .enqueue_task = enqueue_task_stop, |
87 | .dequeue_task = dequeue_task_stop, |
88 | .yield_task = yield_task_stop, |
89 | |
90 | .check_preempt_curr = check_preempt_curr_stop, |
91 | |
92 | .pick_next_task = pick_next_task_stop, |
93 | .put_prev_task = put_prev_task_stop, |
94 | |
95 | #ifdef CONFIG_SMP |
96 | .select_task_rq = select_task_rq_stop, |
97 | #endif |
98 | |
99 | .set_curr_task = set_curr_task_stop, |
100 | .task_tick = task_tick_stop, |
101 | |
102 | .get_rr_interval = get_rr_interval_stop, |
103 | |
104 | .prio_changed = prio_changed_stop, |
105 | .switched_to = switched_to_stop, |
106 | }; |
107 |
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