linux/include/linux/irq_work.h
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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
  20struct irq_work {
  21        unsigned long flags;
  22        struct llist_node llnode;
  23        void (*func)(struct irq_work *);
  24};
  25
  26static inline
  27void init_irq_work(struct irq_work *work, void (*func)(struct irq_work *))
  28{
  29        work->flags = 0;
  30        work->func = func;
  31}
  32
  33void irq_work_queue(struct irq_work *work);
  34void irq_work_run(void);
  35void irq_work_sync(struct irq_work *work);
  36
  37#ifdef CONFIG_IRQ_WORK
  38bool irq_work_needs_cpu(void);
  39#else
  40static inline bool irq_work_needs_cpu(void) { return false; }
  41#endif
  42
  43#endif /* _LINUX_IRQ_WORK_H */
  44
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