"small fix of Place" (#6766)

paddle/platform/device_context.cc

@@ -19,7 +19,7 @@ CPUDeviceContext::CPUDeviceContext() {
   eigen_device_.reset(new Eigen::DefaultDevice());
 }
 
-CPUDeviceContext::CPUDeviceContext(CPUPlace place) {
+CPUDeviceContext::CPUDeviceContext(CPUPlace place) : place_(place) {
   eigen_device_.reset(new Eigen::DefaultDevice());
 }
 
@@ -27,7 +27,7 @@ Eigen::DefaultDevice* CPUDeviceContext::eigen_device() const {
   return eigen_device_.get();
 }
 
-Place CPUDeviceContext::GetPlace() const { return CPUPlace(); }
+Place CPUDeviceContext::GetPlace() const { return place_; }
 
 #ifdef PADDLE_WITH_CUDA
 

paddle/platform/device_context.h

@@ -45,6 +45,7 @@ class CPUDeviceContext : public DeviceContext {
   Place GetPlace() const override;
 
  private:
+  CPUPlace place_;
   std::unique_ptr<Eigen::DefaultDevice> eigen_device_;
 };