Revert "[cutlass backend] fix assertion that prevent self multiplication (#148233)"

This reverts commit 4aeca28137.

Reverted https://github.com/pytorch/pytorch/pull/148233 on behalf of https://github.com/henrylhtsang due to mistake in PR  ([comment](https://github.com/pytorch/pytorch/pull/148233#issuecomment-2704534995))

test/inductor/test_cutlass_backend.py

@@ -1139,26 +1139,6 @@ class TestCutlassBackend(TestCase):
             num_ops = int(match.group(1))
             self.assertTrue(num_ops > 0, "The number of ops should be greater than 0")
 
-    @unittest.skipIf(not SM90OrLater, "need sm_90")
-    @mock.patch.dict(os.environ, {"PATH": _get_path_without_sccache()})
-    def test_cutlass_backend_matmul_same_tensor(self):
-        max_autotune_gemm_backends = "CUTLASS"
-
-        M = 128
-        A = torch.randn(M, M).cuda().half()
-
-        with config.patch(
-            {
-                "max_autotune": True,
-                "max_autotune_gemm_backends": max_autotune_gemm_backends,
-                "cuda.cutlass_max_profiling_configs": 2,
-                "autotune_fallback_to_aten": False,
-            }
-        ):
-            compiled = torch.compile(torch.mm)
-
-            torch.testing.assert_close(A @ A.t(), compiled(A, A.t()))
-
 
 if __name__ == "__main__":
     from torch._inductor.utils import is_big_gpu

torch/_inductor/codegen/cuda/cuda_kernel.py

@@ -86,20 +86,8 @@ class CUDAKernel(Kernel):
         matches = [
             arg for arg in self.layout_args.values() if arg.matches(node, attr, dim)
         ]
-        if len(matches) > 1:
-            # Verify all matches have the same node, attribute, and dimension
-            # And if they come from the same node, whichever symbol we use is fine.
-            # if in runtime the logic changes, this would trigger guard
-            first_match = matches[0]
-            if not all(
-                match.node == first_match.node
-                and match.attr == first_match.attr
-                and match.dim == first_match.dim
-                for match in matches
-            ):
-                raise AssertionError("All matching layout args should be identical")
-            return first_match
-        return None
+        assert len(matches) <= 1, matches
+        return None if len(matches) == 0 else matches[0]
 
     def add_layout_arg(
         self, symbol: ValidLayoutSymbols, node: IRNode, attr: ValidLayoutAttrs, dim: int