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

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Date:   Sun, 1 Oct 2017 11:26:55 +0800
From:   Fengguang Wu <lkp@...el.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        netdev@...r.kernel.org, jasowang@...hat.com,
        Willem de Bruijn <willemb@...gle.com>, den@...ipeden.com,
        virtualization@...ts.linux-foundation.org, kbuild-all@...org,
        davem@...emloft.net
Subject: Re: [kbuild-all] [PATCH net-next] vhost_net: do not stall on
 zerocopy depletion

On Sun, Oct 01, 2017 at 06:20:49AM +0300, Michael S. Tsirkin wrote:
>On Sun, Oct 01, 2017 at 08:09:30AM +0800, kbuild test robot wrote:
>> 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
>> reproduce:
>>         # apt-get install sparse
>>         make ARCH=x86_64 allmodconfig
>>         make C=1 CF=-D__CHECK_ENDIAN__
>
>BTW __CHECK_ENDIAN__ is the default now, I think you can drop it from
>your scripts.

Good tip, thank you! However since we're testing old kernels, too,
we'll need to keep it for probably 1-3 more years.

Thanks,
Fengguang

>>
>> sparse warnings: (new ones prefixed by >>)
>>
>>
>> vim +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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