Hi Jason, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 1ae7efb388540adc1653a51a3bc3b2c9cef5ec1a commit: 20c384f1ea1a0bc7320bc445c72dd02d2970d594 vhost: refine vhost and vringh kconfig date: 6 weeks ago reproduce: # apt-get install sparse # sparse version: v0.6.1-193-gb8fad4bc-dirty git checkout 20c384f1ea1a0bc7320bc445c72dd02d2970d594 make ARCH=x86_64 allmodconfig make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) drivers/vhost/vhost.c:753:17: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void [noderef] <asn:1> * @@ got n:1> * @@ drivers/vhost/vhost.c:753:17: sparse: expected void [noderef] <asn:1> * drivers/vhost/vhost.c:753:17: sparse: got void * drivers/vhost/vhost.c:753:17: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void [noderef] <asn:1> * @@ got n:1> * @@ drivers/vhost/vhost.c:753:17: sparse: expected void [noderef] <asn:1> * drivers/vhost/vhost.c:753:17: sparse: got void * drivers/vhost/vhost.c:753:17: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void [noderef] <asn:1> * @@ got n:1> * @@ drivers/vhost/vhost.c:753:17: sparse: expected void [noderef] <asn:1> * drivers/vhost/vhost.c:753:17: sparse: got void * drivers/vhost/vhost.c:937:16: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void *addr @@ got restricted __virtio16 [noderef] <asvoid *addr @@ drivers/vhost/vhost.c:937:16: sparse: expected void *addr drivers/vhost/vhost.c:937:16: sparse: got restricted __virtio16 [noderef] <asn:1> * drivers/vhost/vhost.c:900:42: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void [noderef] <asn:1> *addr @@ got n:1> *addr @@ drivers/vhost/vhost.c:900:42: sparse: expected void [noderef] <asn:1> *addr drivers/vhost/vhost.c:900:42: sparse: got void *addr drivers/vhost/vhost.c:753:17: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void [noderef] <asn:1> * @@ got n:1> * @@ drivers/vhost/vhost.c:753:17: sparse: expected void [noderef] <asn:1> * drivers/vhost/vhost.c:753:17: sparse: got void * drivers/vhost/vhost.c:922:16: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void *addr @@ got restricted __virtio16 [noderef] [usertype] <asvoid *addr @@ drivers/vhost/vhost.c:922:16: sparse: expected void *addr drivers/vhost/vhost.c:922:16: sparse: got restricted __virtio16 [noderef] [usertype] <asn:1> * drivers/vhost/vhost.c:900:42: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void [noderef] <asn:1> *addr @@ got n:1> *addr @@ drivers/vhost/vhost.c:900:42: sparse: expected void [noderef] <asn:1> *addr drivers/vhost/vhost.c:900:42: sparse: got void *addr drivers/vhost/vhost.c:753:17: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void [noderef] <asn:1> * @@ got n:1> * @@ drivers/vhost/vhost.c:753:17: sparse: expected void [noderef] <asn:1> * drivers/vhost/vhost.c:753:17: sparse: got void * drivers/vhost/vhost.c:1014:16: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void *addr @@ got restricted __virtio16 [noderef] <asvoid *addr @@ drivers/vhost/vhost.c:1014:16: sparse: expected void *addr drivers/vhost/vhost.c:1014:16: sparse: got restricted __virtio16 [noderef] <asn:1> * drivers/vhost/vhost.c:900:42: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void [noderef] <asn:1> *addr @@ got n:1> *addr @@ drivers/vhost/vhost.c:900:42: sparse: expected void [noderef] <asn:1> *addr drivers/vhost/vhost.c:900:42: sparse: got void *addr drivers/vhost/vhost.c:753:17: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void [noderef] <asn:1> * @@ got n:1> * @@ drivers/vhost/vhost.c:753:17: sparse: expected void [noderef] <asn:1> * drivers/vhost/vhost.c:753:17: sparse: got void * drivers/vhost/vhost.c:989:16: sparse: sparse: cast to restricted __virtio16 drivers/vhost/vhost.c:989:16: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void *addr @@ got restricted __virtio16 [noderef] <asvoid *addr @@ drivers/vhost/vhost.c:989:16: sparse: expected void *addr drivers/vhost/vhost.c:989:16: sparse: got restricted __virtio16 [noderef] <asn:1> * drivers/vhost/vhost.c:989:16: sparse: sparse: cast to restricted __virtio16 drivers/vhost/vhost.c:900:42: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void [noderef] <asn:1> *addr @@ got n:1> *addr @@ drivers/vhost/vhost.c:900:42: sparse: expected void [noderef] <asn:1> *addr drivers/vhost/vhost.c:900:42: sparse: got void *addr drivers/vhost/vhost.c:753:17: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void [noderef] <asn:1> * @@ got n:1> * @@ drivers/vhost/vhost.c:753:17: sparse: expected void [noderef] <asn:1> * drivers/vhost/vhost.c:753:17: sparse: got void * drivers/vhost/vhost.c:995:16: sparse: sparse: cast to restricted __virtio16 drivers/vhost/vhost.c:995:16: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void *addr @@ got restricted __virtio16 [noderef] <asvoid *addr @@ drivers/vhost/vhost.c:995:16: sparse: expected void *addr drivers/vhost/vhost.c:995:16: sparse: got restricted __virtio16 [noderef] <asn:1> * drivers/vhost/vhost.c:995:16: sparse: sparse: cast to restricted __virtio16 drivers/vhost/vhost.c:900:42: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void [noderef] <asn:1> *addr @@ got n:1> *addr @@ drivers/vhost/vhost.c:900:42: sparse: expected void [noderef] <asn:1> *addr drivers/vhost/vhost.c:900:42: sparse: got void *addr drivers/vhost/vhost.c:753:17: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void [noderef] <asn:1> * @@ got n:1> * @@ drivers/vhost/vhost.c:753:17: sparse: expected void [noderef] <asn:1> * drivers/vhost/vhost.c:753:17: sparse: got void * drivers/vhost/vhost.c:944:16: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void *addr @@ got restricted __virtio16 [noderef] <asvoid *addr @@ drivers/vhost/vhost.c:944:16: sparse: expected void *addr drivers/vhost/vhost.c:944:16: sparse: got restricted __virtio16 [noderef] <asn:1> * drivers/vhost/vhost.c:900:42: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void [noderef] <asn:1> *addr @@ got n:1> *addr @@ drivers/vhost/vhost.c:900:42: sparse: expected void [noderef] <asn:1> *addr drivers/vhost/vhost.c:900:42: sparse: got void *addr drivers/vhost/vhost.c:753:17: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void [noderef] <asn:1> * @@ got n:1> * @@ drivers/vhost/vhost.c:753:17: sparse: expected void [noderef] <asn:1> * drivers/vhost/vhost.c:753:17: sparse: got void * drivers/vhost/vhost.c:1002:16: sparse: sparse: cast to restricted __virtio16 drivers/vhost/vhost.c:1002:16: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void *addr @@ got restricted __virtio16 [noderef] <asvoid *addr @@ drivers/vhost/vhost.c:1002:16: sparse: expected void *addr drivers/vhost/vhost.c:1002:16: sparse: got restricted __virtio16 [noderef] <asn:1> * drivers/vhost/vhost.c:1002:16: sparse: sparse: cast to restricted __virtio16 drivers/vhost/vhost.c:900:42: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void [noderef] <asn:1> *addr @@ got n:1> *addr @@ drivers/vhost/vhost.c:900:42: sparse: expected void [noderef] <asn:1> *addr drivers/vhost/vhost.c:900:42: sparse: got void *addr drivers/vhost/vhost.c:753:17: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void [noderef] <asn:1> * @@ got n:1> * @@ drivers/vhost/vhost.c:753:17: sparse: expected void [noderef] <asn:1> * drivers/vhost/vhost.c:753:17: sparse: got void * drivers/vhost/vhost.c:1008:16: sparse: sparse: cast to restricted __virtio16 drivers/vhost/vhost.c:1008:16: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void *addr @@ got restricted __virtio16 [noderef] [usertype] <asvoid *addr @@ drivers/vhost/vhost.c:1008:16: sparse: expected void *addr drivers/vhost/vhost.c:1008:16: sparse: got restricted __virtio16 [noderef] [usertype] <asn:1> * drivers/vhost/vhost.c:1008:16: sparse: sparse: cast to restricted __virtio16 drivers/vhost/vhost.c:900:42: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void [noderef] <asn:1> *addr @@ got n:1> *addr @@ drivers/vhost/vhost.c:900:42: sparse: expected void [noderef] <asn:1> *addr drivers/vhost/vhost.c:900:42: sparse: got void *addr drivers/vhost/vhost.c:753:17: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void [noderef] <asn:1> * @@ got n:1> * @@ drivers/vhost/vhost.c:753:17: sparse: expected void [noderef] <asn:1> * drivers/vhost/vhost.c:753:17: sparse: got void * drivers/vhost/vhost.c:989:16: sparse: sparse: cast to restricted __virtio16 drivers/vhost/vhost.c:989:16: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void *addr @@ got restricted __virtio16 [noderef] <asvoid *addr @@ drivers/vhost/vhost.c:989:16: sparse: expected void *addr drivers/vhost/vhost.c:989:16: sparse: got restricted __virtio16 [noderef] <asn:1> * drivers/vhost/vhost.c:989:16: sparse: sparse: cast to restricted __virtio16 drivers/vhost/vhost.c:900:42: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void [noderef] <asn:1> *addr @@ got n:1> *addr @@ drivers/vhost/vhost.c:900:42: sparse: expected void [noderef] <asn:1> *addr drivers/vhost/vhost.c:900:42: sparse: got void *addr drivers/vhost/vhost.c:753:17: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void [noderef] <asn:1> * @@ got n:1> * @@ drivers/vhost/vhost.c:753:17: sparse: expected void [noderef] <asn:1> * drivers/vhost/vhost.c:753:17: sparse: got void * drivers/vhost/vhost.c:989:16: sparse: sparse: cast to restricted __virtio16 drivers/vhost/vhost.c:989:16: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void *addr @@ got restricted __virtio16 [noderef] <asvoid *addr @@ drivers/vhost/vhost.c:989:16: sparse: expected void *addr drivers/vhost/vhost.c:989:16: sparse: got restricted __virtio16 [noderef] <asn:1> * drivers/vhost/vhost.c:989:16: sparse: sparse: cast to restricted __virtio16 drivers/vhost/vhost.c:900:42: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void [noderef] <asn:1> *addr @@ got n:1> *addr @@ drivers/vhost/vhost.c:900:42: sparse: expected void [noderef] <asn:1> *addr drivers/vhost/vhost.c:900:42: sparse: got void *addr drivers/vhost/vhost.c:753:17: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void [noderef] <asn:1> * @@ got n:1> * @@ drivers/vhost/vhost.c:753:17: sparse: expected void [noderef] <asn:1> * drivers/vhost/vhost.c:753:17: sparse: got void * vim +1014 drivers/vhost/vhost.c 7b5d753ebc22c5 Jason Wang 2019-05-24 1010 7b5d753ebc22c5 Jason Wang 2019-05-24 1011 static inline int vhost_get_used_idx(struct vhost_virtqueue *vq, 7b5d753ebc22c5 Jason Wang 2019-05-24 1012 __virtio16 *idx) 7b5d753ebc22c5 Jason Wang 2019-05-24 1013 { 7b5d753ebc22c5 Jason Wang 2019-05-24 @1014 return vhost_get_used(vq, *idx, &vq->used->idx); 7b5d753ebc22c5 Jason Wang 2019-05-24 1015 } 7b5d753ebc22c5 Jason Wang 2019-05-24 1016 :::::: The code at line 1014 was first introduced by commit :::::: 7b5d753ebc22c5b6935a70ce9a857dc6220784f8 vhost: fine grain userspace memory accessors :::::: TO: Jason Wang <jasowang(a)redhat.com&gt; :::::: CC: Michael S. Tsirkin <mst(a)redhat.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org