#define IRQ_WORK_CLAIMED (IRQ_WORK_PENDING | IRQ_WORK_BUSY)
struct irq_work {
- unsigned long flags;
+ 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 *))
{
- work->flags = 0;
+ atomic_set(&work->flags, 0);
work->func = func;
}
-#define DEFINE_IRQ_WORK(name, _f) struct irq_work name = { .func = (_f), }
+#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);
*/
static bool irq_work_claim(struct irq_work *work)
{
- unsigned long flags, oflags, nflags;
+ int flags, oflags, nflags;
/*
* Start with our best wish as a premise but only trust any
* flag value after cmpxchg() result.
*/
- flags = work->flags & ~IRQ_WORK_PENDING;
+ flags = atomic_read(&work->flags) & ~IRQ_WORK_PENDING;
for (;;) {
nflags = flags | IRQ_WORK_CLAIMED;
- oflags = cmpxchg(&work->flags, flags, nflags);
+ oflags = atomic_cmpxchg(&work->flags, flags, nflags);
if (oflags == flags)
break;
if (oflags & IRQ_WORK_PENDING)
static void __irq_work_queue_local(struct irq_work *work)
{
/* If the work is "lazy", handle it from next tick if any */
- if (work->flags & IRQ_WORK_LAZY) {
+ if (atomic_read(&work->flags) & IRQ_WORK_LAZY) {
if (llist_add(&work->llnode, this_cpu_ptr(&lazy_list)) &&
tick_nohz_tick_stopped())
arch_irq_work_raise();
{
struct irq_work *work, *tmp;
struct llist_node *llnode;
- unsigned long flags;
+ int flags;
BUG_ON(!irqs_disabled());
* to claim that work don't rely on us to handle their data
* while we are in the middle of the func.
*/
- flags = work->flags & ~IRQ_WORK_PENDING;
- xchg(&work->flags, flags);
+ flags = atomic_read(&work->flags) & ~IRQ_WORK_PENDING;
+ atomic_xchg(&work->flags, flags);
work->func(work);
/*
* Clear the BUSY bit and return to the free state if
* no-one else claimed it meanwhile.
*/
- (void)cmpxchg(&work->flags, flags, flags & ~IRQ_WORK_BUSY);
+ (void)atomic_cmpxchg(&work->flags, flags, flags & ~IRQ_WORK_BUSY);
}
}
{
lockdep_assert_irqs_enabled();
- while (work->flags & IRQ_WORK_BUSY)
+ while (atomic_read(&work->flags) & IRQ_WORK_BUSY)
cpu_relax();
}
EXPORT_SYMBOL_GPL(irq_work_sync);