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SubjectRe: [PATCH 3/3] virtio-pmem: Add virtio pmem driver

Hello,

Thanks for the report.

> Hi Pankaj,
>
> Thank you for the patch! Yet something to improve:
>
> [auto build test ERROR on linux-nvdimm/libnvdimm-for-next]
> [also build test ERROR on v4.19-rc2 next-20180903]
> [if your patch is applied to the wrong git tree, please drop us a note to
> help improve the system]
>
> url:
> https://github.com/0day-ci/linux/commits/Pankaj-Gupta/kvm-fake-DAX-device/20180903-160032
> base: https://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm.git
> libnvdimm-for-next
> config: i386-randconfig-a3-201835 (attached as .config)
> compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
> reproduce:
> # save the attached .config to linux build tree
> make ARCH=i386
> :::::: branch date: 21 hours ago
> :::::: commit date: 21 hours ago
>
> All errors (new ones prefixed by >>):
>
> drivers/virtio/virtio_pmem.o: In function `virtio_pmem_remove':
> >> drivers/virtio/virtio_pmem.c:220: undefined reference to
> >> `nvdimm_bus_unregister'
> drivers/virtio/virtio_pmem.o: In function `virtio_pmem_probe':
> >> drivers/virtio/virtio_pmem.c:186: undefined reference to
> >> `nvdimm_bus_register'
> >> drivers/virtio/virtio_pmem.c:198: undefined reference to
> >> `nvdimm_pmem_region_create'
> drivers/virtio/virtio_pmem.c:207: undefined reference to
> `nvdimm_bus_unregister'

It looks like dependent configiguration 'LIBNVDIMM' is not enabled. I will add the
dependency in Kconfig file for virtio_pmem in v2.

Thanks,
Pankaj

>
> #
> https://github.com/0day-ci/linux/commit/acce2633da18b0ad58d0cc9243a85b03020ca099
> git remote add linux-review https://github.com/0day-ci/linux
> git remote update linux-review
> git checkout acce2633da18b0ad58d0cc9243a85b03020ca099
> vim +220 drivers/virtio/virtio_pmem.c
>
> acce2633 Pankaj Gupta 2018-08-31 147
> acce2633 Pankaj Gupta 2018-08-31 148 static int virtio_pmem_probe(struct
> virtio_device *vdev)
> acce2633 Pankaj Gupta 2018-08-31 149 {
> acce2633 Pankaj Gupta 2018-08-31 150 int err = 0;
> acce2633 Pankaj Gupta 2018-08-31 151 struct resource res;
> acce2633 Pankaj Gupta 2018-08-31 152 struct virtio_pmem *vpmem;
> acce2633 Pankaj Gupta 2018-08-31 153 struct nvdimm_bus *nvdimm_bus;
> acce2633 Pankaj Gupta 2018-08-31 154 struct nd_region_desc ndr_desc;
> acce2633 Pankaj Gupta 2018-08-31 155 int nid = dev_to_node(&vdev->dev);
> acce2633 Pankaj Gupta 2018-08-31 156 struct nd_region *nd_region;
> acce2633 Pankaj Gupta 2018-08-31 157
> acce2633 Pankaj Gupta 2018-08-31 158 if (!vdev->config->get) {
> acce2633 Pankaj Gupta 2018-08-31 159 dev_err(&vdev->dev, "%s failure:
> config disabled\n",
> acce2633 Pankaj Gupta 2018-08-31 160 __func__);
> acce2633 Pankaj Gupta 2018-08-31 161 return -EINVAL;
> acce2633 Pankaj Gupta 2018-08-31 162 }
> acce2633 Pankaj Gupta 2018-08-31 163
> acce2633 Pankaj Gupta 2018-08-31 164 vdev->priv = vpmem =
> devm_kzalloc(&vdev->dev, sizeof(*vpmem),
> acce2633 Pankaj Gupta 2018-08-31 165 GFP_KERNEL);
> acce2633 Pankaj Gupta 2018-08-31 166 if (!vpmem) {
> acce2633 Pankaj Gupta 2018-08-31 167 err = -ENOMEM;
> acce2633 Pankaj Gupta 2018-08-31 168 goto out_err;
> acce2633 Pankaj Gupta 2018-08-31 169 }
> acce2633 Pankaj Gupta 2018-08-31 170
> acce2633 Pankaj Gupta 2018-08-31 171 vpmem->vdev = vdev;
> acce2633 Pankaj Gupta 2018-08-31 172 err = init_vq(vpmem);
> acce2633 Pankaj Gupta 2018-08-31 173 if (err)
> acce2633 Pankaj Gupta 2018-08-31 174 goto out_err;
> acce2633 Pankaj Gupta 2018-08-31 175
> acce2633 Pankaj Gupta 2018-08-31 176 virtio_cread(vpmem->vdev, struct
> virtio_pmem_config,
> acce2633 Pankaj Gupta 2018-08-31 177 start, &vpmem->start);
> acce2633 Pankaj Gupta 2018-08-31 178 virtio_cread(vpmem->vdev, struct
> virtio_pmem_config,
> acce2633 Pankaj Gupta 2018-08-31 179 size, &vpmem->size);
> acce2633 Pankaj Gupta 2018-08-31 180
> acce2633 Pankaj Gupta 2018-08-31 181 res.start = vpmem->start;
> acce2633 Pankaj Gupta 2018-08-31 182 res.end = vpmem->start +
> vpmem->size-1;
> acce2633 Pankaj Gupta 2018-08-31 183 vpmem->nd_desc.provider_name =
> "virtio-pmem";
> acce2633 Pankaj Gupta 2018-08-31 184 vpmem->nd_desc.module = THIS_MODULE;
> acce2633 Pankaj Gupta 2018-08-31 185
> acce2633 Pankaj Gupta 2018-08-31 @186 vpmem->nvdimm_bus = nvdimm_bus =
> nvdimm_bus_register(&vdev->dev,
> acce2633 Pankaj Gupta 2018-08-31 187 &vpmem->nd_desc);
> acce2633 Pankaj Gupta 2018-08-31 188 if (!nvdimm_bus)
> acce2633 Pankaj Gupta 2018-08-31 189 goto out_vq;
> acce2633 Pankaj Gupta 2018-08-31 190
> acce2633 Pankaj Gupta 2018-08-31 191 dev_set_drvdata(&vdev->dev,
> nvdimm_bus);
> acce2633 Pankaj Gupta 2018-08-31 192 memset(&ndr_desc, 0,
> sizeof(ndr_desc));
> acce2633 Pankaj Gupta 2018-08-31 193
> acce2633 Pankaj Gupta 2018-08-31 194 ndr_desc.res = &res;
> acce2633 Pankaj Gupta 2018-08-31 195 ndr_desc.numa_node = nid;
> acce2633 Pankaj Gupta 2018-08-31 196 ndr_desc.flush = virtio_pmem_flush;
> acce2633 Pankaj Gupta 2018-08-31 197 set_bit(ND_REGION_PAGEMAP,
> &ndr_desc.flags);
> acce2633 Pankaj Gupta 2018-08-31 @198 nd_region =
> nvdimm_pmem_region_create(nvdimm_bus, &ndr_desc);
> acce2633 Pankaj Gupta 2018-08-31 199
> acce2633 Pankaj Gupta 2018-08-31 200 if (!nd_region)
> acce2633 Pankaj Gupta 2018-08-31 201 goto out_nd;
> acce2633 Pankaj Gupta 2018-08-31 202
> acce2633 Pankaj Gupta 2018-08-31 203 //virtio_device_ready(vdev);
> acce2633 Pankaj Gupta 2018-08-31 204 return 0;
> acce2633 Pankaj Gupta 2018-08-31 205 out_nd:
> acce2633 Pankaj Gupta 2018-08-31 206 err = -ENXIO;
> acce2633 Pankaj Gupta 2018-08-31 207 nvdimm_bus_unregister(nvdimm_bus);
> acce2633 Pankaj Gupta 2018-08-31 208 out_vq:
> acce2633 Pankaj Gupta 2018-08-31 209 vdev->config->del_vqs(vdev);
> acce2633 Pankaj Gupta 2018-08-31 210 out_err:
> acce2633 Pankaj Gupta 2018-08-31 211 dev_err(&vdev->dev, "failed to
> register virtio pmem memory\n");
> acce2633 Pankaj Gupta 2018-08-31 212 return err;
> acce2633 Pankaj Gupta 2018-08-31 213 }
> acce2633 Pankaj Gupta 2018-08-31 214
> acce2633 Pankaj Gupta 2018-08-31 215 static void virtio_pmem_remove(struct
> virtio_device *vdev)
> acce2633 Pankaj Gupta 2018-08-31 216 {
> acce2633 Pankaj Gupta 2018-08-31 217 struct virtio_pmem *vpmem =
> vdev->priv;
> acce2633 Pankaj Gupta 2018-08-31 218 struct nvdimm_bus *nvdimm_bus =
> dev_get_drvdata(&vdev->dev);
> acce2633 Pankaj Gupta 2018-08-31 219
> acce2633 Pankaj Gupta 2018-08-31 @220 nvdimm_bus_unregister(nvdimm_bus);
> acce2633 Pankaj Gupta 2018-08-31 221 vdev->config->del_vqs(vdev);
> acce2633 Pankaj Gupta 2018-08-31 222 kfree(vpmem);
> acce2633 Pankaj Gupta 2018-08-31 223 }
> acce2633 Pankaj Gupta 2018-08-31 224
>
> ---
> 0-DAY kernel test infrastructure Open Source Technology Center
> https://lists.01.org/pipermail/kbuild-all Intel Corporation
>

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