================
@@ -1643,17 +1644,31 @@ def GlobalOp : CIR_Op<"global"> {
     described by the type of the variable.
 
     The `linkage` tracks C/C++ linkage types, currently very similar to LLVM's.
+    Symbol visibility in `sym_visibility` is defined in terms of MLIR's 
visibility
+    and verified to be in accordance to `linkage`.
   }];
 
+  // Note that both sym_name and sym_visibility are tied to Symbol trait.
+  // TODO: sym_visibility can possibly be represented by implementing the
+  // necessary Symbol's interface in terms of linkage instead.
   let arguments = (ins SymbolNameAttr:$sym_name,
+                       DefaultValuedAttr<
+                        VisibilityAttr,
----------------
xlauko wrote:

```suggestion
                        CIR_VisibilityAttr,
```

https://github.com/llvm/llvm-project/pull/141973
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