linux-kernel - [PATCH net v2 1/2] driver.h: add helper macro for module

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Message-Id: <20231221085109.2830794-2-yi.fang.gan@intel.com>
Date: Thu, 21 Dec 2023 16:51:08 +0800
From: "Gan, Yi Fang" <yi.fang.gan@...el.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andrew Halaney <ahalaney@...hat.com>,
	Javier Martinez Canillas <javierm@...hat.com>,
	John Stultz <jstultz@...gle.com>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	Gan Yi Fang <yi.fang.gan@...el.com>,
	Jens Axboe <axboe@...nel.dk>,
	Russell King <linux@...linux.org.uk>,
	Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>,
	"David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Marek Behún <kabel@...nel.org>,
	netdev@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc: Looi Hong Aun <hong.aun.looi@...el.com>,
	Voon Weifeng <weifeng.voon@...el.com>,
	Song Yoong Siang <yoong.siang.song@...el.com>,
	Lai Peter Jun Ann <peter.jun.ann.lai@...el.com>,
	Choong Yong Liang <yong.liang.choong@...el.com>
Subject: [PATCH net v2 1/2] driver.h: add helper macro for module_exit() boilerplate

For the modules need a module_init() but don't need to do
anything special in module_exit() might need to have an empty
module_exit(). This patch add a new macro module_exit_stub() to
replace the empty module_exit(). The macro is useful to remove
the module_exit() boilerplate.

Cc: <stable@...r.kernel.org> # 6.1+
Suggested-by: Lobakin, Aleksander <aleksander.lobakin@...el.com>
Signed-off-by: Gan, Yi Fang <yi.fang.gan@...el.com>
---
 include/linux/device/driver.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/include/linux/device/driver.h b/include/linux/device/driver.h
index 7738f458995f..7d322eef501e 100644
--- a/include/linux/device/driver.h
+++ b/include/linux/device/driver.h
@@ -288,4 +288,18 @@ static int __init __driver##_init(void) \
 } \
 device_initcall(__driver##_init);
 
+/**
+ * module_exit_stub() - Helper macro for drivers that have init but don't
+ * do anything in exit. This eliminates some boilerplate.
+ * Each module may only use this macro once, and calling it replaces
+ * module_exit().
+ *
+ * @__driver: driver name
+ */
+#define module_exit_stub(__driver) \
+static void __exit __driver##_exit(void) \
+{ \
+} \
+module_exit(__driver##_exit)
+
 #endif	/* _DEVICE_DRIVER_H_ */
-- 
2.34.1