[toke:xdp-queueing-04 3/12] kernel/bpf/pifomap.c:354:22: warning: no previous prototype for '__pifo_map_dequeue'

[kernel test robot <lkp@intel.com>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/toke/linux.git xdp-queueing-04
head:   d67202baf237752a91366c8ba9bd801942e5fdaf
commit: fe606924ca53da2ffef87d4234ef54a5f1b66fbb [3/12] bpf: Add a PIFO map type for queueing packets
config: nios2-randconfig-r011-20220410 (https://download.01.org/0day-ci/archive/20220410/202204100818.si982aTb-lkp@intel.com/config)
compiler: nios2-linux-gcc (GCC) 11.2.0
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://git.kernel.org/pub/scm/linux/kernel/git/toke/linux.git/commit/?id=fe606924ca53da2ffef87d4234ef54a5f1b66fbb
        git remote add toke https://git.kernel.org/pub/scm/linux/kernel/git/toke/linux.git
        git fetch --no-tags toke xdp-queueing-04
        git checkout fe606924ca53da2ffef87d4234ef54a5f1b66fbb
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=nios2 SHELL=/bin/bash kernel/bpf/

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

All warnings (new ones prefixed by >>):

   In file included from include/linux/kernel.h:26,
                    from include/linux/cpumask.h:10,
                    from include/linux/smp.h:13,
                    from include/linux/lockdep.h:14,
                    from include/linux/spinlock.h:62,
                    from kernel/bpf/pifomap.c:5:
   kernel/bpf/pifomap.c: In function '__pifo_map_enqueue':
   kernel/bpf/pifomap.c:308:47: error: 'index' undeclared (first use in this function); did you mean 'q_index'?
     308 |         q_index = rank - min(queue->min_rank, index);
         |                                               ^~~~~
   include/linux/minmax.h:20:46: note: in definition of macro '__typecheck'
      20 |         (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
         |                                              ^
   include/linux/minmax.h:36:31: note: in expansion of macro '__safe_cmp'
      36 |         __builtin_choose_expr(__safe_cmp(x, y), \
         |                               ^~~~~~~~~~
   include/linux/minmax.h:45:25: note: in expansion of macro '__careful_cmp'
      45 | #define min(x, y)       __careful_cmp(x, y, <)
         |                         ^~~~~~~~~~~~~
   kernel/bpf/pifomap.c:308:26: note: in expansion of macro 'min'
     308 |         q_index = rank - min(queue->min_rank, index);
         |                          ^~~
   kernel/bpf/pifomap.c:308:47: note: each undeclared identifier is reported only once for each function it appears in
     308 |         q_index = rank - min(queue->min_rank, index);
         |                                               ^~~~~
   include/linux/minmax.h:20:46: note: in definition of macro '__typecheck'
      20 |         (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
         |                                              ^
   include/linux/minmax.h:36:31: note: in expansion of macro '__safe_cmp'
      36 |         __builtin_choose_expr(__safe_cmp(x, y), \
         |                               ^~~~~~~~~~
   include/linux/minmax.h:45:25: note: in expansion of macro '__careful_cmp'
      45 | #define min(x, y)       __careful_cmp(x, y, <)
         |                         ^~~~~~~~~~~~~
   kernel/bpf/pifomap.c:308:26: note: in expansion of macro 'min'
     308 |         q_index = rank - min(queue->min_rank, index);
         |                          ^~~
   include/linux/minmax.h:36:9: error: first argument to '__builtin_choose_expr' not a constant
      36 |         __builtin_choose_expr(__safe_cmp(x, y), \
         |         ^~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:45:25: note: in expansion of macro '__careful_cmp'
      45 | #define min(x, y)       __careful_cmp(x, y, <)
         |                         ^~~~~~~~~~~~~
   kernel/bpf/pifomap.c:308:26: note: in expansion of macro 'min'
     308 |         q_index = rank - min(queue->min_rank, index);
         |                          ^~~
   kernel/bpf/pifomap.c: At top level:
>> kernel/bpf/pifomap.c:354:22: warning: no previous prototype for '__pifo_map_dequeue' [-Wmissing-prototypes]
     354 | union bpf_pifo_item *__pifo_map_dequeue(struct bpf_pifo_map *pifo, u64 flags, u64 *rank, bool xdp)
         |                      ^~~~~~~~~~~~~~~~~~


vim +/__pifo_map_dequeue +354 kernel/bpf/pifomap.c

   353	
 > 354	union bpf_pifo_item *__pifo_map_dequeue(struct bpf_pifo_map *pifo, u64 flags, u64 *rank, bool xdp)
   355	{
   356		struct bpf_pifo_queue *queue = pifo->queue;
   357		struct bpf_pifo_bucket *bucket;
   358		union bpf_pifo_item *item;
   359		unsigned long bucket_idx;
   360	
   361		lockdep_assert_held(&pifo->lock);
   362	
   363		if (flags) {
   364			*rank = -EINVAL;
   365			return NULL;
   366		}
   367	
   368		bucket_idx = pifo_find_first_bucket(queue);
   369		if (bucket_idx == -1) {
   370			*rank = -ENOENT;
   371			return NULL;
   372		}
   373		bucket = &queue->buckets[bucket_idx];
   374	
   375		if (WARN_ON_ONCE(!bucket->tail)) {
   376			*rank = -EFAULT;
   377			return NULL;
   378		}
   379	
   380		item = bucket->head;
   381		if (xdp)
   382			bucket->head = (union bpf_pifo_item *)item->frame.next;
   383		else
   384			bucket->head = (union bpf_pifo_item *)item->elem.next;
   385	
   386		if (!bucket->head) {
   387			bucket->tail = NULL;
   388			pifo_clear_bit(queue, bucket_idx);
   389		}
   390		pifo->num_queued--;
   391		bucket->elem_count--;
   392	
   393		*rank = bucket_idx + queue->min_rank;
   394		return item;
   395	}
   396	

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