linux-kernel - [PATCH net-next] net: Remove shadow variable in netdev_run

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Message-Id: <20250221-netcons_fix_shadow-v1-1-dee20c8658dd@debian.org>
Date: Fri, 21 Feb 2025 09:51:27 -0800
From: Breno Leitao <leitao@...ian.org>
To: "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
 Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Breno Leitao <leitao@...ian.org>
Subject: [PATCH net-next] net: Remove shadow variable in netdev_run_todo()

Fix a shadow variable warning in net/core/dev.c when compiled with
CONFIG_LOCKDEP enabled. The warning occurs because 'dev' is redeclared
inside the while loop, shadowing the outer scope declaration.

	net/core/dev.c:11211:22: warning: declaration shadows a local variable [-Wshadow]
		struct net_device *dev = list_first_entry(&unlink_list,

	net/core/dev.c:11202:21: note: previous declaration is here
		struct net_device *dev, *tmp;

Remove the redundant declaration since the variable is already defined
in the outer scope and will be overwritten in the subsequent
list_for_each_entry_safe() loop anyway.

Signed-off-by: Breno Leitao <leitao@...ian.org>
---
Sending this against `net-next` and not using "Fixes:" tag since I don't
think we want this to be backported to stable tree.
---
 net/core/dev.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index 18064be6cf3e3ae0949722a4ffffdc25fdd16b2e..c36b9b05364bab117ce51f3cc6ea5839245fd182 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -11208,9 +11208,8 @@ void netdev_run_todo(void)
 	list_replace_init(&net_unlink_list, &unlink_list);

 	while (!list_empty(&unlink_list)) {
-		struct net_device *dev = list_first_entry(&unlink_list,
-							  struct net_device,
-							  unlink_list);
+		dev = list_first_entry(&unlink_list, struct net_device,
+				       unlink_list);
 		list_del_init(&dev->unlink_list);
 		dev->nested_level = dev->lower_level - 1;
 	}

---
base-commit: bb3bb6c92e5719c0f5d7adb9d34db7e76705ac33
change-id: 20250221-netcons_fix_shadow-e2607c682129

Best regards,
-- 
Breno Leitao <leitao@...ian.org>