linux-kernel - Re: [PATCH] netfilter: fix undefined reference to 'netfilter_lwtunnel_*' when CONFIG

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Date: Fri, 21 Jun 2024 13:43:42 +0200
From: Pablo Neira Ayuso <pablo@...filter.org>
To: Jianguo Wu <wujianguo106@....com>
Cc: LKML <linux-kernel@...r.kernel.org>, netfilter-devel@...r.kernel.org
Subject: Re: [PATCH] netfilter: fix undefined reference to
 'netfilter_lwtunnel_*' when CONFIG_SYSCTL=n

Cc'ing netfilter-devel

On Fri, Jun 21, 2024 at 10:41:13AM +0800, Jianguo Wu wrote:
> 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: 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>
> ---
>  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 */
> -- 
> 1.8.3.1
>