linux-kernel - [PATCH v1] driver core: Silence 'unused-but-set variable' warning

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20221223145137.3786601-1-ammar.faizi@intel.com>
Date:   Fri, 23 Dec 2022 21:51:37 +0700
From:   Ammar Faizi <ammarfaizi2@...weeb.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Ammar Faizi <ammarfaizi2@...weeb.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>,
        LLVM Mailing List <llvm@...ts.linux.dev>
Subject: [PATCH v1] driver core: Silence 'unused-but-set variable' warning

From: Ammar Faizi <ammarfaizi2@...weeb.org>

Compiling with clang-16:

  drivers/base/module.c:36:6: error: variable 'no_warn' set but not \
  used [-Werror,-Wunused-but-set-variable]
          int no_warn;
              ^
  1 error generated.

A reason the @no_warn variable exists is:
sysfs_create_link() return value needs not be ignored to silence
another warning.

So don't remove @no_warn, but add a '(void)no_warn;'.

Cc: LLVM Mailing List <llvm@...ts.linux.dev>
Signed-off-by: Ammar Faizi <ammarfaizi2@...weeb.org>
---
 drivers/base/module.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/base/module.c b/drivers/base/module.c
index 46ad4d636731..42f0b3b9e7f8 100644
--- a/drivers/base/module.c
+++ b/drivers/base/module.c
@@ -59,22 +59,23 @@ void module_add_driver(struct module *mod, struct device_driver *drv)
 		return;
 
 	/* Don't check return codes; these calls are idempotent */
 	no_warn = sysfs_create_link(&drv->p->kobj, &mk->kobj, "module");
 	driver_name = make_driver_name(drv);
 	if (driver_name) {
 		module_create_drivers_dir(mk);
 		no_warn = sysfs_create_link(mk->drivers_dir, &drv->p->kobj,
 					    driver_name);
 		kfree(driver_name);
 	}
+	(void)no_warn;
 }
 
 void module_remove_driver(struct device_driver *drv)
 {
 	struct module_kobject *mk = NULL;
 	char *driver_name;
 
 	if (!drv)
 		return;
 
 	sysfs_remove_link(&drv->p->kobj, "module");

base-commit: 8395ae05cb5a2e31d36106e8c85efa11cda849be
-- 
Ammar Faizi