Patch "netfilter: fix undefined reference to 'netfilter_lwtunnel_*' when CONFIG_SYSCTL=n" has been added to the 6.9-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    netfilter: fix undefined reference to 'netfilter_lwtunnel_*' when CONFIG_SYSCTL=n

to the 6.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     netfilter-fix-undefined-reference-to-netfilter_lwtun.patch
and it can be found in the queue-6.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit ad428b4abf8e506beff978726d27fce93efcfcba
Author: Jianguo Wu <wujianguo@xxxxxxxxxxxxxxx>
Date:   Fri Jun 21 10:41:13 2024 +0800

    netfilter: fix undefined reference to 'netfilter_lwtunnel_*' when CONFIG_SYSCTL=n
    
    [ Upstream commit aef5daa2c49d510436b733827d4f0bab79fcc4a0 ]
    
    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@xxxxxxxxx>
    Reported-by: kernel test robot <lkp@xxxxxxxxx>
    Closes: https://lore.kernel.org/oe-kbuild-all/202406210511.8vbByYj3-lkp@xxxxxxxxx/
    Closes: https://lore.kernel.org/oe-kbuild-all/202406210520.6HmrUaA2-lkp@xxxxxxxxx/
    Signed-off-by: Jianguo Wu <wujianguo@xxxxxxxxxxxxxxx>
    Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/net/netfilter/nf_hooks_lwtunnel.c b/net/netfilter/nf_hooks_lwtunnel.c
index 7cdb59bb4459f..d8ebebc9775d7 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 */