Re: [PATCH net-next] vhost_net: do not stall on zerocopy depletion

From: kbuild test robot <lkp@intel.com>
To: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
Cc: Willem de Bruijn <willemb@google.com>,
	mst@redhat.com, netdev@vger.kernel.org, den@klaipeden.com,
	virtualization@lists.linux-foundation.org, kbuild-all@01.org,
	davem@davemloft.net
Subject: Re: [PATCH net-next] vhost_net: do not stall on zerocopy depletion
Date: Sun, 1 Oct 2017 06:12:32 +0800	[thread overview]
Message-ID: <201710010655.HFVrPE5X%fengguang.wu@intel.com> (raw)
In-Reply-To: <20170928002556.41240-1-willemdebruijn.kernel@gmail.com>

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Hi Willem,

[auto build test WARNING on net-next/master]

url:    https://github.com/0day-ci/linux/commits/Willem-de-Bruijn/vhost_net-do-not-stall-on-zerocopy-depletion/20171001-054709
config: x86_64-randconfig-x002-201740 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   In file included from include/linux/list.h:8:0,
                    from include/linux/wait.h:6,
                    from include/linux/eventfd.h:12,
                    from drivers/vhost/net.c:10:
   drivers/vhost/net.c: In function 'vhost_exceeds_maxpend':
   include/linux/kernel.h:772:16: warning: comparison of distinct pointer types lacks a cast
     (void) (&min1 == &min2);   \
                   ^
   include/linux/kernel.h:775:2: note: in expansion of macro '__min'
     __min(typeof(x), typeof(y),   \
     ^~~~~
>> drivers/vhost/net.c:440:9: note: in expansion of macro 'min'
            min(VHOST_MAX_PEND, vq->num >> 2);
            ^~~

vim +/min +440 drivers/vhost/net.c

   433	
   434	static bool vhost_exceeds_maxpend(struct vhost_net *net)
   435	{
   436		struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX];
   437		struct vhost_virtqueue *vq = &nvq->vq;
   438	
   439		return (nvq->upend_idx + UIO_MAXIOV - nvq->done_idx) % UIO_MAXIOV >
 > 440		       min(VHOST_MAX_PEND, vq->num >> 2);
   441	}
   442	

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

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