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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 | } |
38 | |
39 | static void |
40 | dequeue_task_stop(struct rq *rq, struct task_struct *p, int flags) |
41 | { |
42 | } |
43 | |
44 | static void yield_task_stop(struct rq *rq) |
45 | { |
46 | BUG(); /* the stop task should never yield, its pointless. */ |
47 | } |
48 | |
49 | static void put_prev_task_stop(struct rq *rq, struct task_struct *prev) |
50 | { |
51 | } |
52 | |
53 | static void task_tick_stop(struct rq *rq, struct task_struct *curr, int queued) |
54 | { |
55 | } |
56 | |
57 | static void set_curr_task_stop(struct rq *rq) |
58 | { |
59 | } |
60 | |
61 | static void switched_to_stop(struct rq *rq, struct task_struct *p) |
62 | { |
63 | BUG(); /* its impossible to change to this class */ |
64 | } |
65 | |
66 | static void |
67 | prio_changed_stop(struct rq *rq, struct task_struct *p, int oldprio) |
68 | { |
69 | BUG(); /* how!?, what priority? */ |
70 | } |
71 | |
72 | static unsigned int |
73 | get_rr_interval_stop(struct rq *rq, struct task_struct *task) |
74 | { |
75 | return 0; |
76 | } |
77 | |
78 | /* |
79 | * Simple, special scheduling class for the per-CPU stop tasks: |
80 | */ |
81 | static const struct sched_class stop_sched_class = { |
82 | .next = &rt_sched_class, |
83 | |
84 | .enqueue_task = enqueue_task_stop, |
85 | .dequeue_task = dequeue_task_stop, |
86 | .yield_task = yield_task_stop, |
87 | |
88 | .check_preempt_curr = check_preempt_curr_stop, |
89 | |
90 | .pick_next_task = pick_next_task_stop, |
91 | .put_prev_task = put_prev_task_stop, |
92 | |
93 | #ifdef CONFIG_SMP |
94 | .select_task_rq = select_task_rq_stop, |
95 | #endif |
96 | |
97 | .set_curr_task = set_curr_task_stop, |
98 | .task_tick = task_tick_stop, |
99 | |
100 | .get_rr_interval = get_rr_interval_stop, |
101 | |
102 | .prio_changed = prio_changed_stop, |
103 | .switched_to = switched_to_stop, |
104 | }; |
105 |
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