drivers/vhost/vsock.c:659:10: error: call to undeclared function 'kvzmalloc'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration] drivers/vhost/vsock.c:659:8: error: incompatible integer to pointer conversion assigning to 'struct vhost_vsock *' from 'int' [-Wint-conversion]