first commit

1 files changed, 43 insertions, 0 deletions

diff --git a/include/linux/irq_work.h b/include/linux/irq_work.h
new file mode 100644
index 000000000..66017028d
--- /dev/null
+++ b/include/linux/irq_work.h
@@ -0,0 +1,43 @@
+#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	1UL
+#define IRQ_WORK_BUSY		2UL
+#define IRQ_WORK_FLAGS		3UL
+#define IRQ_WORK_LAZY		4UL /* Doesn't want IPI, wait for tick */
+
+struct irq_work {
+	unsigned long 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;
+	work->func = func;
+}
+
+void irq_work_queue(struct irq_work *work);
+void irq_work_run(void);
+void irq_work_sync(struct irq_work *work);
+
+#ifdef CONFIG_IRQ_WORK
+bool irq_work_needs_cpu(void);
+#else
+static inline bool irq_work_needs_cpu(void) { return false; }
+#endif
+
+#endif /* _LINUX_IRQ_WORK_H */