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netfilter: core: Fix clang warnings about unused static inlines 

Unlike gcc, clang warns about unused static inlines that are not in an
include file:

  net/netfilter/core.c:344:20: error: unused function 'nf_ingress_hook' [-Werror,-Wunused-function]
  static inline bool nf_ingress_hook(const struct nf_hook_ops *reg, int pf)
                     ^
  net/netfilter/core.c:353:20: error: unused function 'nf_egress_hook' [-Werror,-Wunused-function]
  static inline bool nf_egress_hook(const struct nf_hook_ops *reg, int pf)
                     ^

According to commit 6863f5643d ("kbuild: allow Clang to find unused
static inline functions for W=1 build"), the proper resolution is to
mark the affected functions as __maybe_unused.  An alternative approach
would be to move them to include/linux/netfilter_netdev.h, but since
Pablo didn't do that in commit ddcfa710d4 ("netfilter: add
nf_ingress_hook() helper function"), I'm guessing __maybe_unused is
preferred.

This fixes both the warning introduced by Pablo in v5.10 as well as the
one recently introduced by myself with commit 42df6e1d22 ("netfilter:
Introduce egress hook").

Fixes: ddcfa710d4 ("netfilter: add nf_ingress_hook() helper function")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Lukas Wunner 2021-10-16 10:13:27 +02:00 committed by Pablo Neira Ayuso
parent c650c35a25
commit ffdd33dd9c
1 changed files with 4 additions and 2 deletions
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6
net/netfilter/core.c
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@ -341,7 +341,8 @@ static int nf_ingress_check(struct net *net, const struct nf_hook_ops *reg,
return 0;
}
static inline bool nf_ingress_hook(const struct nf_hook_ops *reg, int pf)
static inline bool __maybe_unused nf_ingress_hook(const struct nf_hook_ops *reg,
int pf)
{
if ((pf == NFPROTO_NETDEV && reg->hooknum == NF_NETDEV_INGRESS) ||
(pf == NFPROTO_INET && reg->hooknum == NF_INET_INGRESS))
@ -350,7 +351,8 @@ static inline bool nf_ingress_hook(const struct nf_hook_ops *reg, int pf)
return false;
}
static inline bool nf_egress_hook(const struct nf_hook_ops *reg, int pf)
static inline bool __maybe_unused nf_egress_hook(const struct nf_hook_ops *reg,
int pf)
{
return pf == NFPROTO_NETDEV && reg->hooknum == NF_NETDEV_EGRESS;
}