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Message-ID: <20171001062018-mutt-send-email-mst@kernel.org>
Date: Sun, 1 Oct 2017 06:20:49 +0300
From: "Michael S. Tsirkin" <mst@...hat.com>
To: kbuild test robot <lkp@...el.com>
Cc: Willem de Bruijn <willemdebruijn.kernel@...il.com>,
kbuild-all@...org, netdev@...r.kernel.org, davem@...emloft.net,
jasowang@...hat.com, den@...ipeden.com,
virtualization@...ts.linux-foundation.org,
Willem de Bruijn <willemb@...gle.com>
Subject: Re: [PATCH net-next] vhost_net: do not stall on zerocopy depletion
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.
>
> 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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