Hi Yi,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on vfio/next]
[also build test WARNING on v5.6-rc6 next-20200320]
[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/Liu-Yi-L/vfio-expose-virtual-Shared-Virtual-Addressing-to-VMs/20200322-213259
base:   https://github.com/awilliam/linux-vfio.git next
config: arm64-defconfig (attached as .config)
compiler: aarch64-linux-gcc (GCC) 9.2.0
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=9.2.0 make.cross ARCH=arm64 

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

All warnings (new ones prefixed by >>):

   drivers/vfio/vfio.c: In function 'vfio_create_mm':
   drivers/vfio/vfio.c:2149:8: error: implicit declaration of function 'ioasid_alloc_set'; did you mean 'ioasid_alloc'? [-Werror=implicit-function-declaration]
    2149 |  ret = ioasid_alloc_set((struct ioasid_set *) mm,
         |        ^~~~~~~~~~~~~~~~
         |        ioasid_alloc
>> drivers/vfio/vfio.c:2158:13: warning: assignment to 'long long unsigned int' from 'struct mm_struct *' makes integer from pointer without a cast [-Wint-conversion]
    2158 |  token->val = mm;
         |             ^
   drivers/vfio/vfio.c: In function 'vfio_mm_unlock_and_free':
   drivers/vfio/vfio.c:2170:2: error: implicit declaration of function 'ioasid_free_set'; did you mean 'ioasid_free'? [-Werror=implicit-function-declaration]
    2170 |  ioasid_free_set(vmm->ioasid_sid, true);
         |  ^~~~~~~~~~~~~~~
         |  ioasid_free
   drivers/vfio/vfio.c: In function 'vfio_mm_pasid_alloc':
   drivers/vfio/vfio.c:2227:26: warning: passing argument 1 of 'ioasid_alloc' makes pointer from integer without a cast [-Wint-conversion]
    2227 |  pasid = ioasid_alloc(vmm->ioasid_sid, min, max, NULL);
         |                       ~~~^~~~~~~~~~~~
         |                          |
         |                          int
   In file included from include/linux/iommu.h:16,
                    from drivers/vfio/vfio.c:20:
   include/linux/ioasid.h:45:56: note: expected 'struct ioasid_set *' but argument is of type 'int'
      45 | static inline ioasid_t ioasid_alloc(struct ioasid_set *set, ioasid_t min,
         |                                     ~~~~~~~~~~~~~~~~~~~^~~
   drivers/vfio/vfio.c: In function 'vfio_mm_pasid_free':
   drivers/vfio/vfio.c:2246:25: warning: passing argument 1 of 'ioasid_find' makes pointer from integer without a cast [-Wint-conversion]
    2246 |  pdata = ioasid_find(vmm->ioasid_sid, pasid, NULL);
         |                      ~~~^~~~~~~~~~~~
         |                         |
         |                         int
   In file included from include/linux/iommu.h:16,
                    from drivers/vfio/vfio.c:20:
   include/linux/ioasid.h:55:52: note: expected 'struct ioasid_set *' but argument is of type 'int'
      55 | static inline void *ioasid_find(struct ioasid_set *set, ioasid_t ioasid,
         |                                 ~~~~~~~~~~~~~~~~~~~^~~
   cc1: some warnings being treated as errors

vim +2158 drivers/vfio/vfio.c

  2133	
  2134	/**
  2135	 * VFIO_MM objects - create, release, get, put, search
  2136	 * Caller of the function should have held vfio.vfio_mm_lock.
  2137	 */
  2138	static struct vfio_mm *vfio_create_mm(struct mm_struct *mm)
  2139	{
  2140		struct vfio_mm *vmm;
  2141		struct vfio_mm_token *token;
  2142		int ret = 0;
  2143	
  2144		vmm = kzalloc(sizeof(*vmm), GFP_KERNEL);
  2145		if (!vmm)
  2146			return ERR_PTR(-ENOMEM);
  2147	
  2148		/* Per mm IOASID set used for quota control and group operations */
  2149		ret = ioasid_alloc_set((struct ioasid_set *) mm,
  2150				       VFIO_DEFAULT_PASID_QUOTA, &vmm->ioasid_sid);
  2151		if (ret) {
  2152			kfree(vmm);
  2153			return ERR_PTR(ret);
  2154		}
  2155	
  2156		kref_init(&vmm->kref);
  2157		token = &vmm->token;
> 2158		token->val = mm;
  2159		vmm->pasid_quota = VFIO_DEFAULT_PASID_QUOTA;
  2160		mutex_init(&vmm->pasid_lock);
  2161	
  2162		list_add(&vmm->vfio_next, &vfio.vfio_mm_list);
  2163	
  2164		return vmm;
  2165	}
  2166	

---
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