Re: drivers/vdpa/vdpa.c:296 vdpa_mgmtdev_fill() warn: should '(((1))) << (mdev->id_table[i]->device)' be a 64 bit type?
From: Michael S. Tsirkin
Date: Thu Nov 25 2021 - 11:17:47 EST
On Thu, Nov 25, 2021 at 10:03:28AM +0300, Dan Carpenter wrote:
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head: 5d9f4cf36721aba199975a9be7863a3ff5cd4b59
> commit: 33b347503f014ebf76257327cbc7001c6b721956 vdpa: Define vdpa mgmt device, ops and a netlink interface
> config: i386-randconfig-m021-20211118 (https://download.01.org/0day-ci/archive/20211125/202111250317.VUsGtdox-lkp@xxxxxxxxx/config)
> compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
> Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
>
> smatch warnings:
> drivers/vdpa/vdpa.c:296 vdpa_mgmtdev_fill() warn: should '(((1))) << (mdev->id_table[i]->device)' be a 64 bit type?
>
> vim +296 drivers/vdpa/vdpa.c
>
> 33b347503f014eb Parav Pandit 2021-01-05 280 static int vdpa_mgmtdev_fill(const struct vdpa_mgmt_dev *mdev, struct sk_buff *msg,
> 33b347503f014eb Parav Pandit 2021-01-05 281 u32 portid, u32 seq, int flags)
> 33b347503f014eb Parav Pandit 2021-01-05 282 {
> 33b347503f014eb Parav Pandit 2021-01-05 283 u64 supported_classes = 0;
> ^^^^^^^^^^^^^^^^^^^^^
> This is a u64
>
> 33b347503f014eb Parav Pandit 2021-01-05 284 void *hdr;
> 33b347503f014eb Parav Pandit 2021-01-05 285 int i = 0;
> 33b347503f014eb Parav Pandit 2021-01-05 286 int err;
> 33b347503f014eb Parav Pandit 2021-01-05 287
> 33b347503f014eb Parav Pandit 2021-01-05 288 hdr = genlmsg_put(msg, portid, seq, &vdpa_nl_family, flags, VDPA_CMD_MGMTDEV_NEW);
> 33b347503f014eb Parav Pandit 2021-01-05 289 if (!hdr)
> 33b347503f014eb Parav Pandit 2021-01-05 290 return -EMSGSIZE;
> 33b347503f014eb Parav Pandit 2021-01-05 291 err = vdpa_nl_mgmtdev_handle_fill(msg, mdev);
> 33b347503f014eb Parav Pandit 2021-01-05 292 if (err)
> 33b347503f014eb Parav Pandit 2021-01-05 293 goto msg_err;
> 33b347503f014eb Parav Pandit 2021-01-05 294
> 33b347503f014eb Parav Pandit 2021-01-05 295 while (mdev->id_table[i].device) {
> 33b347503f014eb Parav Pandit 2021-01-05 @296 supported_classes |= BIT(mdev->id_table[i].device);
>
> Which suggests that this should be BIT_ULL().
>
> 33b347503f014eb Parav Pandit 2021-01-05 297 i++;
> 33b347503f014eb Parav Pandit 2021-01-05 298 }
> 33b347503f014eb Parav Pandit 2021-01-05 299
> 33b347503f014eb Parav Pandit 2021-01-05 300 if (nla_put_u64_64bit(msg, VDPA_ATTR_MGMTDEV_SUPPORTED_CLASSES,
> 33b347503f014eb Parav Pandit 2021-01-05 301 supported_classes, VDPA_ATTR_UNSPEC)) {
> 33b347503f014eb Parav Pandit 2021-01-05 302 err = -EMSGSIZE;
> 33b347503f014eb Parav Pandit 2021-01-05 303 goto msg_err;
> 33b347503f014eb Parav Pandit 2021-01-05 304 }
> 33b347503f014eb Parav Pandit 2021-01-05 305
> 33b347503f014eb Parav Pandit 2021-01-05 306 genlmsg_end(msg, hdr);
> 33b347503f014eb Parav Pandit 2021-01-05 307 return 0;
> 33b347503f014eb Parav Pandit 2021-01-05 308
> 33b347503f014eb Parav Pandit 2021-01-05 309 msg_err:
> 33b347503f014eb Parav Pandit 2021-01-05 310 genlmsg_cancel(msg, hdr);
> 33b347503f014eb Parav Pandit 2021-01-05 311 return err;
> 33b347503f014eb Parav Pandit 2021-01-05 312 }
Parav? Any patches for this one?
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx