Arnd Bergmann <arnd@xxxxxxxx> writes:
> A recent change to the dst_output handling caused a new warning
> when the call to NF_HOOK() is the only used of a local variable
> passed as 'dev', and CONFIG_NETFILTER is disabled:
>
> net/ipv6/ip6_output.c: In function 'ip6_output':
> net/ipv6/ip6_output.c:135:21: warning: unused variable 'dev' [-Wunused-variable]
>
> The reason for this is that the NF_HOOK macro in this case does
> not reference the variable at all. To avoid that warning now
> and in the future, this changes the macro into an equivalent
> inline function, which tells the compiler that the variable is
> passed correctly but still unused.
For clarification the actual change that trigger this is I passed in net
instead of computing net as net = dev_net(dev). Which was the second
use of the dev variable.
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> Fixes: ede2059dbaf9 ("dst: Pass net into dst->output")
>
> diff --git a/include/linux/netfilter.h b/include/linux/netfilter.h
> index edb3dc32f1da..1ff5c3f82820 100644
> --- a/include/linux/netfilter.h
> +++ b/include/linux/netfilter.h
> @@ -347,8 +347,23 @@ nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family)
> }
>
> #else /* !CONFIG_NETFILTER */
> -#define NF_HOOK(pf, hook, net, sk, skb, indev, outdev, okfn) (okfn)(net, sk, skb)
> -#define NF_HOOK_COND(pf, hook, net, sk, skb, indev, outdev, okfn, cond) (okfn)(net, sk, skb)
> +static inline int
> +NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk,
> + struct sk_buff *skb, struct net_device *in, struct net_device *out,
> + int (*okfn)(struct net *, struct sock *, struct sk_buff *),
> + bool cond)
> +{
> + return okfn(net, sk, skb);
> +}
> +
> +static inline int
> +NF_HOOK(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, struct sk_buff *skb,
> + struct net_device *in, struct net_device *out,
> + int (*okfn)(struct net *, struct sock *, struct sk_buff *))
> +{
> + return okfn(net, sk, skb);
> +}
> +
> static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net,
> struct sock *sk, struct sk_buff *skb,
> struct net_device *indev, struct net_device *outdev,
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