netdevsim: fix build if SKB_EXTENSIONS=n

__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>
Link: https://patch.msgid.link/20260324140857.783-1-dqfext@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index daa4e4944ce3f2184b193f43dbab88147ae2a7e4..2f278ce376b7ed28c6ee28688ebcc060563da9c7 100644 (file)
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -5097,6 +5097,7 @@ 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) {}