linux-kernel - [congwang:sch_bpf 2/3] kernel/bpf/skb_map.c:160:5: warning: no previous prototype for function 'skb_map

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Date:   Wed, 29 Dec 2021 17:39:18 +0800
From:   kernel test robot <lkp@...el.com>
To:     Cong Wang <cong.wang@...edance.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: [congwang:sch_bpf 2/3] kernel/bpf/skb_map.c:160:5: warning: no
 previous prototype for function 'skb_map_enqueue'

tree:   https://github.com/congwang/linux.git sch_bpf
head:   5fb0da1e47e0c68da0323a3e0399b2628a13e999
commit: bc7c943a32f707b17d62bcbf4cca59f3e0de8d65 [2/3] bpf: introduce skb map
config: x86_64-randconfig-r012-20211228 (https://download.01.org/0day-ci/archive/20211229/202112291719.wxZ293dn-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project cd284b7ac0615afc6e0f1a30da2777e361de27a3)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/congwang/linux/commit/bc7c943a32f707b17d62bcbf4cca59f3e0de8d65
        git remote add congwang https://github.com/congwang/linux.git
        git fetch --no-tags congwang sch_bpf
        git checkout bc7c943a32f707b17d62bcbf4cca59f3e0de8d65
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash kernel/bpf/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

>> kernel/bpf/skb_map.c:160:5: warning: no previous prototype for function 'skb_map_enqueue' [-Wmissing-prototypes]
   int skb_map_enqueue(struct sk_buff *skb, struct bpf_map *map, u64 key)
       ^
   kernel/bpf/skb_map.c:160:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int skb_map_enqueue(struct sk_buff *skb, struct bpf_map *map, u64 key)
   ^
   static 
>> kernel/bpf/skb_map.c:180:17: warning: no previous prototype for function 'skb_map_dequeue' [-Wmissing-prototypes]
   struct sk_buff *skb_map_dequeue(struct bpf_map *map)
                   ^
   kernel/bpf/skb_map.c:180:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   struct sk_buff *skb_map_dequeue(struct bpf_map *map)
   ^
   static 
   2 warnings generated.


vim +/skb_map_enqueue +160 kernel/bpf/skb_map.c

   159	
 > 160	int skb_map_enqueue(struct sk_buff *skb, struct bpf_map *map, u64 key)
   161	{
   162		struct bpf_skb_map *pq = bpf_skb_map(map);
   163		struct skb_map_node *n;
   164		unsigned long flags;
   165	
   166		if (atomic_inc_return(&pq->count) > pq->map.max_entries)
   167			return -ENOBUFS;
   168		n = alloc_skb_map_node(pq);
   169		if (!n)
   170			return -ENOMEM;
   171		n->key = key;
   172		n->skb = skb_get(skb);
   173		raw_spin_lock_irqsave(&pq->lock, flags);
   174		pq_push(&pq->root, &n->node);
   175		raw_spin_unlock_irqrestore(&pq->lock, flags);
   176		return 0;
   177	
   178	}
   179	
 > 180	struct sk_buff *skb_map_dequeue(struct bpf_map *map)
   181	{
   182		struct bpf_skb_map *pq = bpf_skb_map(map);
   183		struct skb_map_node *n;
   184		struct pq_node *node;
   185		unsigned long flags;
   186	
   187		raw_spin_lock_irqsave(&pq->lock, flags);
   188		node = pq_pop(&pq->root);
   189		if (!node) {
   190			raw_spin_unlock_irqrestore(&pq->lock, flags);
   191			return NULL;
   192		}
   193		raw_spin_unlock_irqrestore(&pq->lock, flags);
   194		n = container_of(node, struct skb_map_node, node);
   195		consume_skb(n->skb);
   196		atomic_dec(&pq->count);
   197		return n->skb;
   198	}
   199	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org