netdev - [PATCH net 1/2] netfilter: fix undefined reference to 'netfilter_lwtunnel_*' when CONFIG

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Date: Thu, 27 Jun 2024 01:38:44 +0200
From: Pablo Neira Ayuso <pablo@...filter.org>
To: netfilter-devel@...r.kernel.org
Cc: davem@...emloft.net,
	netdev@...r.kernel.org,
	kuba@...nel.org,
	pabeni@...hat.com,
	edumazet@...gle.com,
	fw@...len.de,
	torvalds@...uxfoundation.org
Subject: [PATCH net 1/2] netfilter: fix undefined reference to 'netfilter_lwtunnel_*' when CONFIG_SYSCTL=n

From: Jianguo Wu <wujianguo@...natelecom.cn>

if CONFIG_SYSFS is not enabled in config, we get the below compile error,

All errors (new ones prefixed by >>):

   csky-linux-ld: net/netfilter/core.o: in function `netfilter_init':
   core.c:(.init.text+0x42): undefined reference to `netfilter_lwtunnel_init'
>> csky-linux-ld: core.c:(.init.text+0x56): undefined reference to `netfilter_lwtunnel_fini'
>> csky-linux-ld: core.c:(.init.text+0x70): undefined reference to `netfilter_lwtunnel_init'
   csky-linux-ld: core.c:(.init.text+0x78): undefined reference to `netfilter_lwtunnel_fini'

Fixes: a2225e0250c5 ("netfilter: move the sysctl nf_hooks_lwtunnel into the netfilter core")
Reported-by: Mirsad Todorovac <mtodorovac69@...il.com>
Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202406210511.8vbByYj3-lkp@intel.com/
Closes: https://lore.kernel.org/oe-kbuild-all/202406210520.6HmrUaA2-lkp@intel.com/
Signed-off-by: Jianguo Wu <wujianguo@...natelecom.cn>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
 net/netfilter/nf_hooks_lwtunnel.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/netfilter/nf_hooks_lwtunnel.c b/net/netfilter/nf_hooks_lwtunnel.c
index 7cdb59bb4459..d8ebebc9775d 100644
--- a/net/netfilter/nf_hooks_lwtunnel.c
+++ b/net/netfilter/nf_hooks_lwtunnel.c
@@ -117,4 +117,7 @@ void netfilter_lwtunnel_fini(void)
 {
 	unregister_pernet_subsys(&nf_lwtunnel_net_ops);
 }
+#else
+int __init netfilter_lwtunnel_init(void) { return 0; }
+void netfilter_lwtunnel_fini(void) {}
 #endif /* CONFIG_SYSCTL */
-- 
2.30.2