Fix is_ptr_accessible_on_host

src/sparse_blas/backends/mkl_common/mkl_helper.hpp

@@ -39,17 +39,18 @@ template <typename T>
 inline bool is_ptr_accessible_on_host(sycl::queue &queue, const T *host_or_device_ptr) {
     auto alloc_type = sycl::get_pointer_type(host_or_device_ptr, queue.get_context());
     // Note sycl::usm::alloc::host may not be accessible on the host according to SYCL specification.
-    return alloc_type == sycl::usm::alloc::shared;
+    // sycl::usm::alloc::unknown is returned if the pointer is not a USM allocation which is assumed to be a normal host pointer.
+    return alloc_type == sycl::usm::alloc::shared || alloc_type == sycl::usm::alloc::unknown;
 }
 
 /// Throw an exception if the scalar is not accessible in the host
 template <typename T>
 void check_ptr_is_host_accessible(const std::string &function_name, const std::string &scalar_name,
                                   sycl::queue &queue, const T *host_or_device_ptr) {
-    if (is_ptr_accessible_on_host(queue, host_or_device_ptr)) {
+    if (!is_ptr_accessible_on_host(queue, host_or_device_ptr)) {
         throw mkl::invalid_argument(
             "sparse_blas", function_name,
-            "Scalar " + scalar_name + "must be accessible on the host for buffer functions.");
+            "Scalar " + scalar_name + " must be accessible on the host for buffer functions.");
     }
 }