Extend CPPCHECK scope to portable kernels

.lintrunner.toml

@@ -194,7 +194,6 @@ exclude_patterns = [
 
     # Kernel areas to onboard separately.
     'kernels/optimized/**',
-    'kernels/portable/**',
 
     # Runtime areas to onboard incrementally.
     'runtime/backend/**',
@@ -243,6 +242,23 @@ command = [
     '--extra-arg=--suppress=duplicateBranch:*kernels/test/*',
     '--extra-arg=--suppress=useStlAlgorithm:*kernels/test/*',
     '--extra-arg=--suppress=functionStatic:*kernels/test/*',
+    # Portable kernels are referenced through generated registration tables,
+    # which cppcheck CTU does not see as direct C++ calls.
+    '--extra-arg=--suppress=unusedFunction:*kernels/portable/*',
+    # Cppcheck does not parse several ExecuTorch macro idioms used heavily in
+    # portable kernels, including empty macro arguments and printf-style macros
+    # concatenated into string literals.
+    '--extra-arg=--suppress=unknownMacro:*kernels/portable/*',
+    '--extra-arg=--suppress=syntaxError:*kernels/portable/*',
+    # Keep style-only portable-kernel findings scoped to this tree rather than
+    # rewriting broad helper code for lint-only advice.
+    '--extra-arg=--suppress=useStlAlgorithm:*kernels/portable/*',
+    '--extra-arg=--suppress=variableScope:*kernels/portable/*',
+    '--extra-arg=--suppress=constParameterReference:*kernels/portable/*',
+    '--extra-arg=--suppress=constParameterPointer:*kernels/portable/*',
+    '--extra-arg=--suppress=functionStatic:*kernels/portable/*',
+    '--extra-arg=--suppress=knownConditionTrueFalse:*kernels/portable/*',
+    '--extra-arg=--suppress=invalidFunctionArg:*kernels/portable/*',
     '--',
     '@{{PATHSFILE}}'
 ]

kernels/portable/cpu/util/copy_ops_util.cpp

@@ -1,6 +1,7 @@
 /*
  * Copyright (c) Meta Platforms, Inc. and affiliates.
  * All rights reserved.
+ * Copyright 2026 Arm Limited and/or its affiliates.
  *
  * This source code is licensed under the BSD-style license found in the
  * LICENSE file in the root directory of this source tree.
@@ -241,7 +242,7 @@ bool check_permute_copy_args(const Tensor& in, IntArrayRef dims, Tensor& out) {
     size_t dim = dims[i] >= 0 ? dims[i] : in.dim() + dims[i];
 
     // Internal check, since we have already validated this
-    ET_LOG_AND_RETURN_IF_FALSE(dim < kTensorDimensionLimit && dim >= 0);
+    ET_LOG_AND_RETURN_IF_FALSE(dim < kTensorDimensionLimit);
 
     // Check that the dimension hasn't been seen previously.
     ET_CHECK_OR_RETURN_FALSE(

kernels/portable/cpu/util/test/reduce_test.cpp

@@ -1,6 +1,7 @@
 /*
  * Copyright (c) Meta Platforms, Inc. and affiliates.
  * All rights reserved.
+ * Copyright 2026 Arm Limited and/or its affiliates.
  *
  * This source code is licensed under the BSD-style license found in the
  * LICENSE file in the root directory of this source tree.
@@ -50,8 +51,6 @@ void _apply_over_dim_list(
 
 TEST(ReduceUtilTest, ApplyOverDim) {
   TensorFactory<ScalarType::Long> tf;
-  optional<ArrayRef<int64_t>> dim_list;
-
   Tensor in = tf.zeros({2, 4, 5, 3});
   _apply_over_dim(in, 0);
   // clang-format off
@@ -85,8 +84,6 @@ TEST(ReduceUtilTest, ApplyOverDim) {
   // clang-format on
 
   in = tf.zeros({2, 4, 5, 3});
-  int64_t dim_array_2[1] = {2};
-  dim_list = optional<ArrayRef<int64_t>>(ArrayRef<int64_t>{dim_array_2, 1});
   _apply_over_dim(in, 2);
   // clang-format off
   EXPECT_TENSOR_EQ(in, tf.make({2, 4, 5, 3}, {
@@ -103,8 +100,6 @@ TEST(ReduceUtilTest, ApplyOverDim) {
   // clang-format on
 
   in = tf.zeros({2, 4, 5, 3});
-  int64_t dim_array_3[1] = {3};
-  dim_list = optional<ArrayRef<int64_t>>(ArrayRef<int64_t>{dim_array_3, 1});
   _apply_over_dim(in, 3);
   // clang-format off
   EXPECT_TENSOR_EQ(in, tf.make({2, 4, 5, 3}, {
@@ -470,7 +465,7 @@ TEST(ReduceUtilTest, ApplyOnZeroDimTensorOverDimListNonEmpty) {
       optional<ArrayRef<int64_t>>(ArrayRef<int64_t>{dim_array_0, 1});
 
   Tensor in = tf.ones({});
-  _apply_over_dim_list(in, dim_list), "";
+  _apply_over_dim_list(in, dim_list);
   EXPECT_TENSOR_EQ(in, tf.make({}, {0}));
 }