linux-kernel - Re: [PATCH] virtio_ring: remove unused variable in virtqueue

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Date:   Fri, 20 May 2022 22:12:21 +0800
From:   kernel test robot <lkp@...el.com>
To:     Bo Liu <liubo03@...pur.com>, mst@...hat.com, jasowang@...hat.com
Cc:     kbuild-all@...ts.01.org, virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, Bo Liu <liubo03@...pur.com>
Subject: Re: [PATCH] virtio_ring: remove unused variable in virtqueue_add()

Hi Bo,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v5.18-rc7 next-20220519]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/intel-lab-lkp/linux/commits/Bo-Liu/virtio_ring-remove-unused-variable-in-virtqueue_add/20220520-161845
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 3d7285a335edaf23b699e87c528cf0b0070e3293
config: x86_64-rhel-8.3-func (https://download.01.org/0day-ci/archive/20220520/202205202236.ztzLWFZ4-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-1) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/8344061823a47f3245d81db45f5898d940ac488e
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Bo-Liu/virtio_ring-remove-unused-variable-in-virtqueue_add/20220520-161845
        git checkout 8344061823a47f3245d81db45f5898d940ac488e
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

   drivers/virtio/virtio_ring.c: In function 'virtqueue_add':
>> drivers/virtio/virtio_ring.c:1785:16: error: 'vq' undeclared (first use in this function); did you mean '_vq'?
    1785 |         return vq->packed_ring ? virtqueue_add_packed(_vq, sgs, total_sg,
         |                ^~
         |                _vq
   drivers/virtio/virtio_ring.c:1785:16: note: each undeclared identifier is reported only once for each function it appears in
   drivers/virtio/virtio_ring.c:1789:1: error: control reaches end of non-void function [-Werror=return-type]
    1789 | }
         | ^
   cc1: some warnings being treated as errors


vim +1785 drivers/virtio/virtio_ring.c

1ce9e6055fa0a9 Tiwei Bie 2018-11-21  1770  
1ce9e6055fa0a9 Tiwei Bie 2018-11-21  1771  
e6f633e5beab65 Tiwei Bie 2018-11-21  1772  /*
e6f633e5beab65 Tiwei Bie 2018-11-21  1773   * Generic functions and exported symbols.
e6f633e5beab65 Tiwei Bie 2018-11-21  1774   */
e6f633e5beab65 Tiwei Bie 2018-11-21  1775  
e6f633e5beab65 Tiwei Bie 2018-11-21  1776  static inline int virtqueue_add(struct virtqueue *_vq,
e6f633e5beab65 Tiwei Bie 2018-11-21  1777  				struct scatterlist *sgs[],
e6f633e5beab65 Tiwei Bie 2018-11-21  1778  				unsigned int total_sg,
e6f633e5beab65 Tiwei Bie 2018-11-21  1779  				unsigned int out_sgs,
e6f633e5beab65 Tiwei Bie 2018-11-21  1780  				unsigned int in_sgs,
e6f633e5beab65 Tiwei Bie 2018-11-21  1781  				void *data,
e6f633e5beab65 Tiwei Bie 2018-11-21  1782  				void *ctx,
e6f633e5beab65 Tiwei Bie 2018-11-21  1783  				gfp_t gfp)
e6f633e5beab65 Tiwei Bie 2018-11-21  1784  {
1ce9e6055fa0a9 Tiwei Bie 2018-11-21 @1785  	return vq->packed_ring ? virtqueue_add_packed(_vq, sgs, total_sg,
1ce9e6055fa0a9 Tiwei Bie 2018-11-21  1786  					out_sgs, in_sgs, data, ctx, gfp) :
1ce9e6055fa0a9 Tiwei Bie 2018-11-21  1787  				 virtqueue_add_split(_vq, sgs, total_sg,
e6f633e5beab65 Tiwei Bie 2018-11-21  1788  					out_sgs, in_sgs, data, ctx, gfp);
e6f633e5beab65 Tiwei Bie 2018-11-21  1789  }
e6f633e5beab65 Tiwei Bie 2018-11-21  1790  

-- 
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https://01.org/lkp