chore: import upstream snapshot with attribution

paddle/phi/kernels/cpu/c_identity_kernel.cc

@@ -0,0 +1,43 @@
+/* Copyright (c) 2023 PaddlePaddle Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License. */
+
+#include "paddle/phi/kernels/c_identity_kernel.h"
+
+#include "paddle/phi/backends/cpu/cpu_context.h"
+#include "paddle/phi/core/kernel_registry.h"
+
+namespace phi {
+
+template <typename T, typename Context>
+void CIdentityKernel(const Context& dev_ctx,
+                     const DenseTensor& x,
+                     int ring_id,
+                     bool use_calc_stream,
+                     bool use_model_parallel,
+                     DenseTensor* out) {
+  PADDLE_THROW(
+      errors::Unavailable("Do not support c_identity for cpu kernel now."));
+}
+
+}  // namespace phi
+
+PD_REGISTER_KERNEL(c_identity,
+                   CPU,
+                   ALL_LAYOUT,
+                   phi::CIdentityKernel,
+                   float,
+                   double,
+                   int,
+                   int64_t,
+                   phi::float16) {}