drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c:4205:3: note: in expansion of macro 'xchg'

[kbuild test robot]

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	

---
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