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Date:   Wed, 27 May 2020 06:53:55 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Zhu Lingshan <lingshan.zhu@...el.com>, mst@...hat.com,
        kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        jasowang@...hat.com
Cc:     kbuild-all@...ts.01.org, lulu@...hat.com, dan.daly@...el.com,
        cunming.liang@...el.com, Zhu Lingshan <lingshan.zhu@...el.com>
Subject: Re: [PATCH] vdpa: bypass waking up vhost_woker for vdpa vq kick

Hi Zhu,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on vhost/linux-next]
[also build test WARNING on v5.7-rc7 next-20200526]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Zhu-Lingshan/vdpa-bypass-waking-up-vhost_woker-for-vdpa-vq-kick/20200526-133819
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next
config: alpha-allyesconfig (attached as .config)
compiler: alpha-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        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
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=alpha 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@...el.com>

All warnings (new ones prefixed by >>, old ones prefixed by <<):

>> drivers/vhost/vdpa.c:290:6: warning: no previous prototype for 'vhost_vdpa_poll_stop' [-Wmissing-prototypes]
290 | void vhost_vdpa_poll_stop(struct vhost_virtqueue *vq)
|      ^~~~~~~~~~~~~~~~~~~~
>> drivers/vhost/vdpa.c:295:5: warning: no previous prototype for 'vhost_vdpa_poll_start' [-Wmissing-prototypes]
295 | int vhost_vdpa_poll_start(struct vhost_virtqueue *vq)
|     ^~~~~~~~~~~~~~~~~~~~~
>> drivers/vhost/vdpa.c:750:6: warning: no previous prototype for 'vhost_vdpa_poll_init' [-Wmissing-prototypes]
750 | void vhost_vdpa_poll_init(struct vhost_dev *dev)
|      ^~~~~~~~~~~~~~~~~~~~

vim +/vhost_vdpa_poll_stop +290 drivers/vhost/vdpa.c

   276	
   277	static long vhost_vdpa_get_vring_num(struct vhost_vdpa *v, u16 __user *argp)
   278	{
   279		struct vdpa_device *vdpa = v->vdpa;
   280		const struct vdpa_config_ops *ops = vdpa->config;
   281		u16 num;
   282	
   283		num = ops->get_vq_num_max(vdpa);
   284	
   285		if (copy_to_user(argp, &num, sizeof(num)))
   286			return -EFAULT;
   287	
   288		return 0;
   289	}
 > 290	void vhost_vdpa_poll_stop(struct vhost_virtqueue *vq)
   291	{
   292		vhost_poll_stop(&vq->poll);
   293	}
   294	
 > 295	int vhost_vdpa_poll_start(struct vhost_virtqueue *vq)
   296	{
   297		struct vhost_poll *poll = &vq->poll;
   298		struct file *file = vq->kick;
   299		__poll_t mask;
   300	
   301	
   302		if (poll->wqh)
   303			return 0;
   304	
   305		mask = vfs_poll(file, &poll->table);
   306		if (mask)
   307			vq->handle_kick(&vq->poll.work);
   308		if (mask & EPOLLERR) {
   309			vhost_poll_stop(poll);
   310			return -EINVAL;
   311		}
   312	
   313		return 0;
   314	}
   315	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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