netdev - Re: [PATCH] net: mvneta: add basic XDP

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Message-ID: <201812201433.MvE5YZ5S%fengguang.wu@intel.com>
Date:   Thu, 20 Dec 2018 15:01:11 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Domagoj Pintaric <domagoj.pintaric@...tura.hr>
Cc:     kbuild-all@...org, netdev@...r.kernel.org,
        Domagoj Pintaric <domagoj.pintaric@...tura.hr>,
        Luka Perkov <luka.perkov@...tura.hr>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        "David S . Miller" <davem@...emloft.net>
Subject: Re: [PATCH] net: mvneta: add basic XDP_DROP support

Hi Domagoj,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on net/master]
[also build test WARNING on v4.20-rc7 next-20181219]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Domagoj-Pintaric/net-mvneta-add-basic-XDP_DROP-support/20181220-112012
config: parisc-allmodconfig (attached as .config)
compiler: hppa-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
        # save the attached .config to linux build tree
        GCC_VERSION=7.2.0 make.cross ARCH=parisc 

All warnings (new ones prefixed by >>):

   In file included from arch/parisc/include/asm/atomic.h:10:0,
                    from include/linux/atomic.h:7,
                    from arch/parisc/include/asm/bitops.h:13,
                    from include/linux/bitops.h:19,
                    from include/linux/kernel.h:11,
                    from include/linux/clk.h:16,
                    from drivers/net/ethernet/marvell/mvneta.c:14:
   drivers/net/ethernet/marvell/mvneta.c: In function 'mvneta_xdp_set':
   arch/parisc/include/asm/cmpxchg.h:48:3: warning: value computed is not used [-Wunused-value]
     ((__typeof__(*(ptr)))__xchg((unsigned long)(x), (ptr), sizeof(*(ptr))))
     ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/net/ethernet/marvell/mvneta.c:3926:3: note: in expansion of macro 'xchg'
      xchg(&rxq->xdp_prog, pp->xdp_prog);
      ^~~~

vim +/xchg +3926 drivers/net/ethernet/marvell/mvneta.c

  3914	
  3915	static int mvneta_xdp_set(struct net_device *dev, struct bpf_prog *xdp_prog)
  3916	{
  3917		struct mvneta_port *pp = netdev_priv(dev);
  3918		struct bpf_prog *xdp_prog_old;
  3919		int queue;
  3920	
  3921		xdp_prog_old = xchg(&pp->xdp_prog, xdp_prog);
  3922	
  3923		for (queue = 0; queue < rxq_number; queue++) {
  3924			struct mvneta_rx_queue *rxq = &pp->rxqs[queue];
  3925	
> 3926			xchg(&rxq->xdp_prog, pp->xdp_prog);
  3927		}
  3928	
  3929		if (xdp_prog_old)
  3930			bpf_prog_put(xdp_prog_old);
  3931	
  3932		return 0;
  3933	}
  3934	

---
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