[PATCH net] netdevsim: fix build if SKB_EXTENSIONS=n

[PATCH net] netdevsim: fix build if SKB_EXTENSIONS=n

[Qingfang Deng]

__skb_ext_put() is not declared if SKB_EXTENSIONS is not enabled, which
causes a build error:

drivers/net/netdevsim/netdev.c: In function 'nsim_forward_skb':
drivers/net/netdevsim/netdev.c:114:25: error: implicit declaration of function '__skb_ext_put'; did you mean 'skb_ext_put'? [-Werror=implicit-function-declaration]
  114 |                         __skb_ext_put(psp_ext);
      |                         ^~~~~~~~~~~~~
      |                         skb_ext_put
cc1: some warnings being treated as errors

Add a stub to fix the build.

Fixes: 7d9351435ebb ("netdevsim: drop PSP ext ref on forward failure")
Signed-off-by: Qingfang Deng <dqfext@gmail.com>
---
 include/linux/skbuff.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 9cc98f850f1d..fbfa9852e82a 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -5106,6 +5106,7 @@ static inline bool skb_has_extensions(struct sk_buff *skb)
 	return unlikely(skb->active_extensions);
 }
 #else
+static inline void __skb_ext_put(struct skb_ext *ext) {}
 static inline void skb_ext_put(struct sk_buff *skb) {}
 static inline void skb_ext_reset(struct sk_buff *skb) {}
 static inline void skb_ext_del(struct sk_buff *skb, int unused) {}
-- 
2.43.0

Re: [PATCH net] netdevsim: fix build if SKB_EXTENSIONS=n

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Tue, 24 Mar 2026 22:08:56 +0800 you wrote:
> __skb_ext_put() is not declared if SKB_EXTENSIONS is not enabled, which
> causes a build error:
> 
> drivers/net/netdevsim/netdev.c: In function 'nsim_forward_skb':
> drivers/net/netdevsim/netdev.c:114:25: error: implicit declaration of function '__skb_ext_put'; did you mean 'skb_ext_put'? [-Werror=implicit-function-declaration]
>   114 |                         __skb_ext_put(psp_ext);
>       |                         ^~~~~~~~~~~~~
>       |                         skb_ext_put
> cc1: some warnings being treated as errors
> 
> [...]

Here is the summary with links:
  - [net] netdevsim: fix build if SKB_EXTENSIONS=n
    https://git.kernel.org/netdev/net/c/57a04a13aac1

You are awesome, thank you!
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