linux-kernel - [PATCH] module: silence warning about unused 'no

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Date: Fri, 22 Mar 2024 14:20:05 +0100
From: Arnd Bergmann <arnd@...nel.org>
To: Luis Chamberlain <mcgrof@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Arnd Bergmann <arnd@...db.de>,
	linux-modules@...r.kernel.org,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] module: silence warning about unused 'no_warn' variable

From: Arnd Bergmann <arnd@...db.de>

The sysfs_create_link() return code is marked as __must_check, but the
module_add_driver() function tries hard to not care, by assigning the
return code to a variable. When building with 'make W=1', gcc still
warns because this variable is only assigned but not used:

drivers/base/module.c: In function 'module_add_driver':
drivers/base/module.c:36:6: warning: variable 'no_warn' set but not used [-Wunused-but-set-variable]

Add an explicit cast to void to prevent this check as well.

Cc: Luis Chamberlain <mcgrof@...nel.org>
Cc: linux-modules@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>
Fixes: e17e0f51aeea ("Driver core: show drivers in /sys/module/")
See-also: 4a7fb6363f2d ("add __must_check to device management code")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
I'm not entirely sure what bug the __must_check on sysfs_create_link()
is trying to prevent, or why the module loader code is allowed to
ignore this. It would be nice to have an Ack from the sysfs maintainers
on this.
---
 drivers/base/module.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/base/module.c b/drivers/base/module.c
index 46ad4d636731..0180dbcf2240 100644
--- a/drivers/base/module.c
+++ b/drivers/base/module.c
@@ -67,6 +67,8 @@ void module_add_driver(struct module *mod, struct device_driver *drv)
 					    driver_name);
 		kfree(driver_name);
 	}
+
+	(void)no_warn;
 }
 
 void module_remove_driver(struct device_driver *drv)
-- 
2.39.2