Index: mlir/include/mlir/Transforms/Passes.td
===================================================================
--- mlir/include/mlir/Transforms/Passes.td
+++ mlir/include/mlir/Transforms/Passes.td
@@ -109,7 +109,7 @@
   let constructor = "mlir::createInlinerPass()";
   let options = [
     Option<"defaultPipelineStr", "default-pipeline", "std::string",
-           /*default=*/"", "The default optimizer pipeline used for callables">,
+           /*default=*/"\"canonicalize\"", "The default optimizer pipeline used for callables">,
     ListOption<"opPipelineList", "op-pipelines", "OpPassManager",
                "Callable operation specific optimizer pipelines (in the form "
                "of `dialect.op(pipeline)`)">,
Index: mlir/test/Transforms/inlining-dump-default-pipeline.mlir
===================================================================
--- /dev/null
+++ mlir/test/Transforms/inlining-dump-default-pipeline.mlir
@@ -0,0 +1,2 @@
+// RUN: mlir-opt %s -pass-pipeline="builtin.module(inline)" -dump-pass-pipeline 2>&1 | FileCheck %s
+// CHECK: builtin.module(inline{default-pipeline=canonicalize max-iterations=4 })