Merge branch 'nohz/printk-v8' into irq/core

[mirror_ubuntu-artful-kernel.git] / include / linux / irq_work.h

diff --git a/include/linux/irq_work.h b/include/linux/irq_work.h
index ce60c084635b5a9cef539ed79c8b34fe0b583a15..f5dbce50466e6546fc72f4084ed0d0c91d91fe1e 100644 (file)
--- a/include/linux/irq_work.h
+++ b/include/linux/irq_work.h
@@ -3,6 +3,20 @@
 
 #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;
@@ -20,4 +34,10 @@ 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 bool irq_work_needs_cpu(void) { return false; }
+#endif
+
 #endif /* _LINUX_IRQ_WORK_H */