forked from mirrors/linux
8c4890d1c3
Instead of relying on BUG_ON() to ensure the various data structures line up, use a bunch of horrible unions to make it all automatic. Much of the union magic is to ensure irq_work and smp_call_function do not (yet) see the members of their respective data structures change name. Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Reviewed-by: Frederic Weisbecker <frederic@kernel.org> Link: https://lkml.kernel.org/r/20200622100825.844455025@infradead.org
58 lines
1.3 KiB
C
58 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_IRQ_WORK_H
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#define _LINUX_IRQ_WORK_H
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#include <linux/smp_types.h>
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/*
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* An entry can be in one of four states:
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*
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* free NULL, 0 -> {claimed} : free to be used
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* claimed NULL, 3 -> {pending} : claimed to be enqueued
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* pending next, 3 -> {busy} : queued, pending callback
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* busy NULL, 2 -> {free, claimed} : callback in progress, can be claimed
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*/
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struct irq_work {
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union {
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struct __call_single_node node;
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struct {
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struct llist_node llnode;
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atomic_t flags;
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};
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};
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void (*func)(struct irq_work *);
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};
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static inline
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void init_irq_work(struct irq_work *work, void (*func)(struct irq_work *))
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{
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atomic_set(&work->flags, 0);
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work->func = func;
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}
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#define DEFINE_IRQ_WORK(name, _f) struct irq_work name = { \
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.flags = ATOMIC_INIT(0), \
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.func = (_f) \
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}
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bool irq_work_queue(struct irq_work *work);
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bool irq_work_queue_on(struct irq_work *work, int cpu);
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void irq_work_tick(void);
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void irq_work_sync(struct irq_work *work);
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#ifdef CONFIG_IRQ_WORK
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#include <asm/irq_work.h>
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void irq_work_run(void);
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bool irq_work_needs_cpu(void);
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void irq_work_single(void *arg);
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#else
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static inline bool irq_work_needs_cpu(void) { return false; }
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static inline void irq_work_run(void) { }
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static inline void irq_work_single(void *arg) { }
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#endif
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#endif /* _LINUX_IRQ_WORK_H */
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