[PATCH 6.18 030/277] netdevsim: fix build if SKB_EXTENSIONS=n

Greg Kroah-Hartman
2026-04-08T18:28:37Z

From: Qingfang Deng <dqfext@gmail.com>

[ Upstream commit 57a04a13aac1f247d171c3f3aef93efc69e6979e ]

__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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
include/linux/skbuff.h | 1 +
1 file changed, 1 insertion(+)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 50f127451dc65..def9cca948178 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -5018,6 +5018,7 @@ 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) {}
--
2.53.0