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1 | #ifndef _LINUX_IRQ_WORK_H |
2 | #define _LINUX_IRQ_WORK_H |
3 | |
4 | #include <linux/llist.h> |
5 | |
6 | /* |
7 | * An entry can be in one of four states: |
8 | * |
9 | * free NULL, 0 -> {claimed} : free to be used |
10 | * claimed NULL, 3 -> {pending} : claimed to be enqueued |
11 | * pending next, 3 -> {busy} : queued, pending callback |
12 | * busy NULL, 2 -> {free, claimed} : callback in progress, can be claimed |
13 | */ |
14 | |
15 | #define IRQ_WORK_PENDING 1UL |
16 | #define IRQ_WORK_BUSY 2UL |
17 | #define IRQ_WORK_FLAGS 3UL |
18 | #define IRQ_WORK_LAZY 4UL /* Doesn't want IPI, wait for tick */ |
19 | |
20 | struct irq_work { |
21 | unsigned long flags; |
22 | struct llist_node llnode; |
23 | void (*func)(struct irq_work *); |
24 | }; |
25 | |
26 | static inline |
27 | void init_irq_work(struct irq_work *work, void (*func)(struct irq_work *)) |
28 | { |
29 | work->flags = 0; |
30 | work->func = func; |
31 | } |
32 | |
33 | void irq_work_queue(struct irq_work *work); |
34 | void irq_work_run(void); |
35 | void irq_work_sync(struct irq_work *work); |
36 | |
37 | #ifdef CONFIG_IRQ_WORK |
38 | bool irq_work_needs_cpu(void); |
39 | #else |
40 | static inline bool irq_work_needs_cpu(void) { return false; } |
41 | #endif |
42 | |
43 | #endif /* _LINUX_IRQ_WORK_H */ |
44 |
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