irq_work: Cleanup

Get rid of the __call_single_node union and clean up the API a little
to avoid external code relying on the structure layout as much.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>

1 files changed, 21 insertions, 12 deletions

diff --git a/include/linux/irq_work.h b/include/linux/irq_work.h
index 30823780c192..ec2a47a81e42 100644
--- a/include/linux/irq_work.h
+++ b/include/linux/irq_work.h
@@ -14,28 +14,37 @@
  */
 
 struct irq_work {
-	union {
-		struct __call_single_node node;
-		struct {
-			struct llist_node llnode;
-			atomic_t flags;
-		};
-	};
+	struct __call_single_node node;
 	void (*func)(struct irq_work *);
 };
 
+#define __IRQ_WORK_INIT(_func, _flags) (struct irq_work){	\
+	.node = { .u_flags = (_flags), },			\
+	.func = (_func),					\
+}
+
+#define IRQ_WORK_INIT(_func) __IRQ_WORK_INIT(_func, 0)
+#define IRQ_WORK_INIT_LAZY(_func) __IRQ_WORK_INIT(_func, IRQ_WORK_LAZY)
+#define IRQ_WORK_INIT_HARD(_func) __IRQ_WORK_INIT(_func, IRQ_WORK_HARD_IRQ)
+
+#define DEFINE_IRQ_WORK(name, _f)				\
+	struct irq_work name = IRQ_WORK_INIT(_f)
+
 static inline
 void init_irq_work(struct irq_work *work, void (*func)(struct irq_work *))
 {
-	atomic_set(&work->flags, 0);
-	work->func = func;
+	*work = IRQ_WORK_INIT(func);
 }
 
-#define DEFINE_IRQ_WORK(name, _f) struct irq_work name = {	\
-		.flags = ATOMIC_INIT(0),			\
-		.func  = (_f)					\
+static inline bool irq_work_is_pending(struct irq_work *work)
+{
+	return atomic_read(&work->node.a_flags) & IRQ_WORK_PENDING;
 }
 
+static inline bool irq_work_is_busy(struct irq_work *work)
+{
+	return atomic_read(&work->node.a_flags) & IRQ_WORK_BUSY;
+}
 
 bool irq_work_queue(struct irq_work *work);
 bool irq_work_queue_on(struct irq_work *work, int cpu);