tree:   git://git.infradead.org/users/hch/misc.git i915-mdev
head:   3e7e1da34feaeb5473f397c9cab73b4eb7f6a33c
commit: 3e7e1da34feaeb5473f397c9cab73b4eb7f6a33c [40/40] vfio: improve vfio_group_get_external_user
config: h8300-randconfig-p002-20210725 (attached as .config)
compiler: h8300-linux-gcc (GCC) 10.3.0
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
        git remote add hch-misc git://git.infradead.org/users/hch/misc.git
        git fetch --no-tags hch-misc i915-mdev
        git checkout 3e7e1da34feaeb5473f397c9cab73b4eb7f6a33c
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross ARCH=h8300 

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

All warnings (new ones prefixed by >>):

   drivers/vfio/vfio.c: In function 'vfio_group_container_acquire_fd':
>> drivers/vfio/vfio.c:1649:10: warning: returning 'int' from a function with return type 'struct vfio_group *' makes pointer from integer without a cast [-Wint-conversion]
    1649 |   return -EBADF;
         |          ^


vim +1649 drivers/vfio/vfio.c

  1630	
  1631	/**
  1632	 * vfio_group_container_acquire_fd - acquire access to a VFIO container
  1633	 *				     by file descriptor
  1634	 * @fd:		file descriptor to access
  1635	 *
  1636	 * Grab a reference to the VFIO container used by the VFIO group pointed to by
  1637	 * @fd.
  1638	 *
  1639	 * Returns the VFIO group on success or an error pointer.
  1640	 */
  1641	struct vfio_group *vfio_group_container_acquire_fd(int fd)
  1642	{
  1643		struct vfio_group *group;
  1644		struct fd f;
  1645		int ret = -EINVAL;
  1646	
  1647		f = fdget(fd);
  1648		if (!f.file)
> 1649			return -EBADF;
  1650		if (f.file->f_op != &vfio_group_fops)
  1651			goto out_fdput;
  1652	
  1653		group = f.file->private_data;
  1654		ret = vfio_group_container_acquire(group);
  1655		if (ret)
  1656			goto out_fdput;
  1657		return group;
  1658	
  1659	out_fdput:
  1660		fdput(f);
  1661		return ERR_PTR(ret);
  1662	}
  1663	EXPORT_SYMBOL_GPL(vfio_group_container_acquire_fd);
  1664	

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