diff --git a/kernels/common/device.cpp b/kernels/common/device.cpp
index 499a6d48ac..ecc99463a3 100644
--- a/kernels/common/device.cpp
+++ b/kernels/common/device.cpp
@@ -78,6 +78,8 @@ namespace embree
     case CPU::XEON_PHI_KNIGHTS_MILL   : frequency_level = FREQUENCY_SIMD512; break;
     case CPU::XEON_PHI_KNIGHTS_LANDING: frequency_level = FREQUENCY_SIMD512; break;
     case CPU::ARM:             frequency_level = FREQUENCY_SIMD256; break;
+    default:
+      frequency_level = FREQUENCY_SIMD256; break;
     }
 
     /* initialize global state */
diff --git a/kernels/sycl/rthwif_embree_builder.cpp b/kernels/sycl/rthwif_embree_builder.cpp
index 891f767415..13c16716d8 100644
--- a/kernels/sycl/rthwif_embree_builder.cpp
+++ b/kernels/sycl/rthwif_embree_builder.cpp
@@ -172,32 +172,10 @@ namespace embree
     return pvc;
   }
 
-  static bool hasDriverExtension(ze_driver_handle_t hDriver, const char* extensionName)
-  {
-    uint32_t count = 0;
-    ze_result_t result = ZeWrapper::zeDriverGetExtensionProperties(hDriver, &count, nullptr);
-    if (result != ZE_RESULT_SUCCESS)
-      return false;
-
-    std::vector<ze_driver_extension_properties_t> extensions(count);
-    result = ZeWrapper::zeDriverGetExtensionProperties(hDriver, &count, extensions.data());
-    if (result != ZE_RESULT_SUCCESS)
-      return false;
-
-    for (uint32_t i = 0; i < count; i++)
-    {
-      if (strncmp(extensionName, extensions[i].name, sizeof(extensions[i].name)) == 0)
-        return true;
-    }
-    return false;
-  }
-
   void* rthwifAllocAccelBuffer(Device* embree_device, size_t bytes, sycl::device device, sycl::context context, sycl::usm::alloc alloc_type)
   {
     ze_context_handle_t hContext = sycl::get_native<sycl::backend::ext_oneapi_level_zero>(context);
     ze_device_handle_t  hDevice  = sycl::get_native<sycl::backend::ext_oneapi_level_zero>(device);
-    sycl::platform platform = device.get_platform();
-    ze_driver_handle_t hDriver = sycl::get_native<sycl::backend::ext_oneapi_level_zero>(platform);
 
     ze_rtas_device_ext_properties_t rtasProp = { ZE_STRUCTURE_TYPE_RTAS_DEVICE_EXT_PROPERTIES };
     ze_device_properties_t devProp = { ZE_STRUCTURE_TYPE_DEVICE_PROPERTIES, &rtasProp };
diff --git a/tutorials/common/imgui/imgui_widgets.cpp b/tutorials/common/imgui/imgui_widgets.cpp
index 5095fca0f9..0a0aab026f 100644
--- a/tutorials/common/imgui/imgui_widgets.cpp
+++ b/tutorials/common/imgui/imgui_widgets.cpp
@@ -4439,7 +4439,7 @@ bool ImGui::InputTextEx(const char* label, const char* hint, char* buf, int buf_
                 // Clear input
                 apply_new_text = "";
                 apply_new_text_length = 0;
-                STB_TEXTEDIT_CHARTYPE empty_string;
+                STB_TEXTEDIT_CHARTYPE empty_string = '\0';
                 stb_textedit_replace(state, &state->Stb, &empty_string, 0);
             }
             else if (strcmp(buf, state->InitialTextA.Data) != 0)