153bedbac2
We need to convert flags to atomic_t in order to later fix an ordering issue on atomic_cmpxchg() failure. This will allow us to use atomic_fetch_or(). Also clarify the nature of those flags. [ mingo: Converted two more usage site the original patch missed. ] Signed-off-by: Frederic Weisbecker <frederic@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E . McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20191108160858.31665-2-frederic@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
60 lines
1.4 KiB
C
60 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _LINUX_IRQ_WORK_H
|
|
#define _LINUX_IRQ_WORK_H
|
|
|
|
#include <linux/llist.h>
|
|
|
|
/*
|
|
* An entry can be in one of four states:
|
|
*
|
|
* free NULL, 0 -> {claimed} : free to be used
|
|
* claimed NULL, 3 -> {pending} : claimed to be enqueued
|
|
* pending next, 3 -> {busy} : queued, pending callback
|
|
* busy NULL, 2 -> {free, claimed} : callback in progress, can be claimed
|
|
*/
|
|
|
|
#define IRQ_WORK_PENDING BIT(0)
|
|
#define IRQ_WORK_BUSY BIT(1)
|
|
|
|
/* Doesn't want IPI, wait for tick: */
|
|
#define IRQ_WORK_LAZY BIT(2)
|
|
|
|
#define IRQ_WORK_CLAIMED (IRQ_WORK_PENDING | IRQ_WORK_BUSY)
|
|
|
|
struct irq_work {
|
|
atomic_t flags;
|
|
struct llist_node llnode;
|
|
void (*func)(struct irq_work *);
|
|
};
|
|
|
|
static inline
|
|
void init_irq_work(struct irq_work *work, void (*func)(struct irq_work *))
|
|
{
|
|
atomic_set(&work->flags, 0);
|
|
work->func = func;
|
|
}
|
|
|
|
#define DEFINE_IRQ_WORK(name, _f) struct irq_work name = { \
|
|
.flags = ATOMIC_INIT(0), \
|
|
.func = (_f) \
|
|
}
|
|
|
|
|
|
bool irq_work_queue(struct irq_work *work);
|
|
bool irq_work_queue_on(struct irq_work *work, int cpu);
|
|
|
|
void irq_work_tick(void);
|
|
void irq_work_sync(struct irq_work *work);
|
|
|
|
#ifdef CONFIG_IRQ_WORK
|
|
#include <asm/irq_work.h>
|
|
|
|
void irq_work_run(void);
|
|
bool irq_work_needs_cpu(void);
|
|
#else
|
|
static inline bool irq_work_needs_cpu(void) { return false; }
|
|
static inline void irq_work_run(void) { }
|
|
#endif
|
|
|
|
#endif /* _LINUX_IRQ_WORK_H */
|