tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 
master
head:   e6506eb241871d68647c53cb6d0a16299550ae97
commit: c7aec59657b60f3a29fc7d3274ebefd698879301 ixgbevf: Add XDP support for 
pass and drop actions
date:   8 weeks ago
config: sparc-allyesconfig (attached as .config)
compiler: sparc64-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        wget 
https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O 
~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout c7aec59657b60f3a29fc7d3274ebefd698879301
        # save the attached .config to linux build tree
        make.cross ARCH=sparc 

All warnings (new ones prefixed by >>):

   In file included from arch/sparc/include/asm/cmpxchg.h:5:0,
                    from arch/sparc/include/asm/atomic_64.h:12,
                    from arch/sparc/include/asm/atomic.h:5,
                    from include/linux/atomic.h:5,
                    from include/asm-generic/qspinlock_types.h:28,
                    from arch/sparc/include/asm/spinlock_types.h:6,
                    from include/linux/spinlock_types.h:13,
                    from include/linux/spinlock.h:82,
                    from include/linux/seqlock.h:36,
                    from include/linux/time.h:6,
                    from include/linux/stat.h:19,
                    from include/linux/module.h:10,
                    from drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c:35:
   drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c: In function 
'ixgbevf_xdp_setup':
   arch/sparc/include/asm/cmpxchg_64.h:55:22: warning: value computed is not 
used [-Wunused-value]
    #define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned 
long)(x),(ptr),sizeof(*(ptr))))
                        
~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c:4205:3: note: in expansion 
>> of macro 'xchg'
      xchg(&adapter->rx_ring[i]->xdp_prog, adapter->xdp_prog);
      ^~~~

vim +/xchg +4205 drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c

  4188  
  4189  static int ixgbevf_xdp_setup(struct net_device *dev, struct bpf_prog 
*prog)
  4190  {
  4191          int i, frame_size = dev->mtu + ETH_HLEN + ETH_FCS_LEN + 
VLAN_HLEN;
  4192          struct ixgbevf_adapter *adapter = netdev_priv(dev);
  4193          struct bpf_prog *old_prog;
  4194  
  4195          /* verify ixgbevf ring attributes are sufficient for XDP */
  4196          for (i = 0; i < adapter->num_rx_queues; i++) {
  4197                  struct ixgbevf_ring *ring = adapter->rx_ring[i];
  4198  
  4199                  if (frame_size > ixgbevf_rx_bufsz(ring))
  4200                          return -EINVAL;
  4201          }
  4202  
  4203          old_prog = xchg(&adapter->xdp_prog, prog);
  4204          for (i = 0; i < adapter->num_rx_queues; i++)
> 4205                  xchg(&adapter->rx_ring[i]->xdp_prog, adapter->xdp_prog);
  4206  
  4207          if (old_prog)
  4208                  bpf_prog_put(old_prog);
  4209  
  4210          return 0;
  4211  }
  4212  

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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