linux-kernel - [PATCH] genirq/irqaction: Move dev_id and percpu_dev

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Date:   Sat, 10 Apr 2021 13:00:08 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     linux-kernel@...r.kernel.org, kernel-team@...roid.com
Subject: [PATCH] genirq/irqaction: Move dev_id and percpu_dev_id in a union

dev_id and percpu_dev_id are mutually exclusive in struct irqaction,
as they conceptually represent the same thing, only in a per-cpu
fashion.

Move them into an anonymous union, saving a few bytes on the way.

Signed-off-by: Marc Zyngier <maz@...nel.org>
---
 include/linux/interrupt.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index 967e25767153..4383ee033acf 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -109,8 +109,10 @@ typedef irqreturn_t (*irq_handler_t)(int, void *);
  */
 struct irqaction {
 	irq_handler_t		handler;
-	void			*dev_id;
-	void __percpu		*percpu_dev_id;
+	union {
+		void		*dev_id;
+		void __percpu	*percpu_dev_id;
+	};
 	struct irqaction	*next;
 	irq_handler_t		thread_fn;
 	struct task_struct	*thread;
-- 
2.30.2