GPU: Do not register GPU flat memory objects if GPU not enabled

Author: davidrohr

GPU/GPUTracking/Global/GPUChainTracking.cxx

@@ -77,9 +77,11 @@ GPUChainTracking::~GPUChainTracking() = default;
 
 void GPUChainTracking::RegisterPermanentMemoryAndProcessors()
 {
-  mFlatObjectsShadow.InitGPUProcessor(mRec, GPUProcessor::PROCESSOR_TYPE_SLAVE);
-  mFlatObjectsDevice.InitGPUProcessor(mRec, GPUProcessor::PROCESSOR_TYPE_DEVICE, &mFlatObjectsShadow);
-  mFlatObjectsShadow.mMemoryResFlat = mRec->RegisterMemoryAllocation(&mFlatObjectsShadow, &GPUTrackingFlatObjects::SetPointersFlatObjects, GPUMemoryResource::MEMORY_PERMANENT, "CalibObjects");
+  if (mRec->IsGPU()) {
+    mFlatObjectsShadow.InitGPUProcessor(mRec, GPUProcessor::PROCESSOR_TYPE_SLAVE);
+    mFlatObjectsDevice.InitGPUProcessor(mRec, GPUProcessor::PROCESSOR_TYPE_DEVICE, &mFlatObjectsShadow);
+    mFlatObjectsShadow.mMemoryResFlat = mRec->RegisterMemoryAllocation(&mFlatObjectsShadow, &GPUTrackingFlatObjects::SetPointersFlatObjects, GPUMemoryResource::MEMORY_PERMANENT, "CalibObjects");
+  }
 
   mRec->RegisterGPUProcessor(mInputsHost.get(), mRec->IsGPU());
   if (GetRecoSteps() & RecoStep::TPCSliceTracking) {