Re: [PATCH 4/6] KVM: Add KVM_(UN)REGISTER_COALESCED_MMIO2 ioctls

[kernel test robot <lkp@intel.com>]

Hi Ilias,

kernel test robot noticed the following build errors:

[auto build test ERROR on kvm/queue]
[also build test ERROR on mst-vhost/linux-next linus/master v6.10-rc7]
[cannot apply to kvm/linux-next next-20240712]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Ilias-Stamatis/KVM-Fix-coalesced_mmio_has_room/20240710-222059
base:   https://git.kernel.org/pub/scm/virt/kvm/kvm.git queue
patch link:    https://lore.kernel.org/r/20240710085259.2125131-5-ilstam%40amazon.com
patch subject: [PATCH 4/6] KVM: Add KVM_(UN)REGISTER_COALESCED_MMIO2 ioctls
config: loongarch-randconfig-001-20240713 (https://download.01.org/0day-ci/archive/20240714/202407140049.CuVivD5M-lkp@intel.com/config)
compiler: loongarch64-linux-gcc (GCC) 14.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240714/202407140049.CuVivD5M-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202407140049.CuVivD5M-lkp@intel.com/

All errors (new ones prefixed by >>):

   arch/loongarch/kvm/../../../virt/kvm/coalesced_mmio.c: In function 'kvm_vm_ioctl_register_coalesced_mmio':
>> arch/loongarch/kvm/../../../virt/kvm/coalesced_mmio.c:292:24: error: implicit declaration of function 'fget'; did you mean 'sget'? [-Wimplicit-function-declaration]
     292 |                 file = fget(zone->buffer_fd);
         |                        ^~~~
         |                        sget
>> arch/loongarch/kvm/../../../virt/kvm/coalesced_mmio.c:292:22: error: assignment to 'struct file *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
     292 |                 file = fget(zone->buffer_fd);
         |                      ^
>> arch/loongarch/kvm/../../../virt/kvm/coalesced_mmio.c:297:25: error: implicit declaration of function 'fput'; did you mean 'iput'? [-Wimplicit-function-declaration]
     297 |                         fput(file);
         |                         ^~~~
         |                         iput


vim +292 arch/loongarch/kvm/../../../virt/kvm/coalesced_mmio.c

   278	
   279	int kvm_vm_ioctl_register_coalesced_mmio(struct kvm *kvm,
   280						 struct kvm_coalesced_mmio_zone2 *zone,
   281						 bool use_buffer_fd)
   282	{
   283		int ret = 0;
   284		struct file *file;
   285		struct kvm_coalesced_mmio_dev *dev;
   286		struct kvm_coalesced_mmio_buffer_dev *buffer_dev = NULL;
   287	
   288		if (zone->pio != 1 && zone->pio != 0)
   289			return -EINVAL;
   290	
   291		if (use_buffer_fd) {
 > 292			file = fget(zone->buffer_fd);
   293			if (!file)
   294				return -EBADF;
   295	
   296			if (file->f_op != &coalesced_mmio_buffer_ops) {
 > 297				fput(file);
   298				return -EINVAL;
   299			}
   300	
   301			buffer_dev = file->private_data;
   302			if (!buffer_dev->ring) {
   303				fput(file);
   304				return -ENOBUFS;
   305			}
   306		}
   307	
   308		dev = kzalloc(sizeof(struct kvm_coalesced_mmio_dev),
   309			      GFP_KERNEL_ACCOUNT);
   310		if (!dev) {
   311			ret = -ENOMEM;
   312			goto out_free_file;
   313		}
   314	
   315		kvm_iodevice_init(&dev->dev, &coalesced_mmio_ops);
   316		dev->kvm = kvm;
   317		dev->zone = *zone;
   318		dev->buffer_dev = buffer_dev;
   319	
   320		mutex_lock(&kvm->slots_lock);
   321		ret = kvm_io_bus_register_dev(kvm,
   322					zone->pio ? KVM_PIO_BUS : KVM_MMIO_BUS,
   323					zone->addr, zone->size, &dev->dev);
   324		if (ret < 0)
   325			goto out_free_dev;
   326		list_add_tail(&dev->list, &kvm->coalesced_zones);
   327		mutex_unlock(&kvm->slots_lock);
   328	
   329		goto out_free_file;
   330	
   331	out_free_dev:
   332		mutex_unlock(&kvm->slots_lock);
   333		kfree(dev);
   334	out_free_file:
   335		if (use_buffer_fd)
   336			fput(file);
   337	
   338		return ret;
   339	}
   340	

-- 
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https://github.com/intel/lkp-tests/wiki