linux-kernel - Re: [PATCH v3 1/2] virtio: stop using legacy struct vring in kernel

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Date:   Tue, 7 Apr 2020 04:54:13 +0800
From:   kbuild test robot <lkp@...el.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Jason Wang <jasowang@...hat.com>,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v3 1/2] virtio: stop using legacy struct vring in kernel

Hi "Michael,

I love your patch! Yet something to improve:

[auto build test ERROR on next-20200406]
[also build test ERROR on v5.6]
[cannot apply to vhost/linux-next linus/master linux/master v5.6 v5.6-rc7 v5.6-rc6]
[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/Michael-S-Tsirkin/virtio-alignment-issues/20200407-025651
base:    b2e2a818a01717ba15c74fd355f76822b81a95f6
config: nds32-defconfig (attached as .config)
compiler: nds32le-linux-gcc (GCC) 9.3.0
reproduce:
        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
        GCC_VERSION=9.3.0 make.cross ARCH=nds32 

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

All errors (new ones prefixed by >>):

   In file included from include/linux/virtio.h:12,
                    from include/linux/virtio_config.h:7,
                    from include/uapi/linux/virtio_net.h:30,
                    from include/linux/virtio_net.h:6,
                    from net//packet/af_packet.c:82:
>> include/linux/vringh.h:42:15: error: field 'vring' has incomplete type
      42 |  struct vring vring;
         |               ^~~~~

vim +/vring +42 include/linux/vringh.h

f87d0fbb579818 Rusty Russell      2013-03-20  20  
f87d0fbb579818 Rusty Russell      2013-03-20  21  /* virtio_ring with information needed for host access. */
f87d0fbb579818 Rusty Russell      2013-03-20  22  struct vringh {
b9f7ac8c72894c Michael S. Tsirkin 2014-12-12  23  	/* Everything is little endian */
b9f7ac8c72894c Michael S. Tsirkin 2014-12-12  24  	bool little_endian;
b9f7ac8c72894c Michael S. Tsirkin 2014-12-12  25  
f87d0fbb579818 Rusty Russell      2013-03-20  26  	/* Guest publishes used event idx (note: we always do). */
f87d0fbb579818 Rusty Russell      2013-03-20  27  	bool event_indices;
f87d0fbb579818 Rusty Russell      2013-03-20  28  
f87d0fbb579818 Rusty Russell      2013-03-20  29  	/* Can we get away with weak barriers? */
f87d0fbb579818 Rusty Russell      2013-03-20  30  	bool weak_barriers;
f87d0fbb579818 Rusty Russell      2013-03-20  31  
f87d0fbb579818 Rusty Russell      2013-03-20  32  	/* Last available index we saw (ie. where we're up to). */
f87d0fbb579818 Rusty Russell      2013-03-20  33  	u16 last_avail_idx;
f87d0fbb579818 Rusty Russell      2013-03-20  34  
f87d0fbb579818 Rusty Russell      2013-03-20  35  	/* Last index we used. */
f87d0fbb579818 Rusty Russell      2013-03-20  36  	u16 last_used_idx;
f87d0fbb579818 Rusty Russell      2013-03-20  37  
f87d0fbb579818 Rusty Russell      2013-03-20  38  	/* How many descriptors we've completed since last need_notify(). */
f87d0fbb579818 Rusty Russell      2013-03-20  39  	u32 completed;
f87d0fbb579818 Rusty Russell      2013-03-20  40  
f87d0fbb579818 Rusty Russell      2013-03-20  41  	/* The vring (note: it may contain user pointers!) */
f87d0fbb579818 Rusty Russell      2013-03-20 @42  	struct vring vring;
3beee86a4b9374 Sjur Brændeland    2013-03-20  43  
9ad9c49cfe970b Jason Wang         2020-03-26  44  	/* IOTLB for this vring */
9ad9c49cfe970b Jason Wang         2020-03-26  45  	struct vhost_iotlb *iotlb;
9ad9c49cfe970b Jason Wang         2020-03-26  46  
3beee86a4b9374 Sjur Brændeland    2013-03-20  47  	/* The function to call to notify the guest about added buffers */
3beee86a4b9374 Sjur Brændeland    2013-03-20  48  	void (*notify)(struct vringh *);
3beee86a4b9374 Sjur Brændeland    2013-03-20  49  };
3beee86a4b9374 Sjur Brændeland    2013-03-20  50  

:::::: The code at line 42 was first introduced by commit
:::::: f87d0fbb579818fed3eeb0923cc253163ab93039 vringh: host-side implementation of virtio rings.

:::::: TO: Rusty Russell <rusty@...tcorp.com.au>
:::::: CC: Rusty Russell <rusty@...tcorp.com.au>

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

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