diff --git a/mlir/docs/Bufferization.md b/mlir/docs/Bufferization.md
--- a/mlir/docs/Bufferization.md
+++ b/mlir/docs/Bufferization.md
@@ -369,9 +369,9 @@
 *   `bufferRelation`: Return `BufferRelation::Equivalent` if the given OpResult
     is the exact same memref as the aliasing OpOperand after bufferization (in
     case of in-place bufferization). Otherwise, (e.g., they overlap but are not
-    necessarily the exact same memrefs), `BufferRelation::None` should be
+    necessarily the exact same memrefs), `BufferRelation::Unknown` should be
     returned. Additional buffer relations will be added in the future, but
-    `BufferRelation::None` is always safe.
+    `BufferRelation::Unknown` is always safe.
 *   `bufferize`: Rewrite the op with the given rewriter. Ops should be replaced
     with `bufferization::replaceOpWithBufferizedValues`.
 
diff --git a/mlir/include/mlir/Dialect/Bufferization/IR/BufferizableOpInterface.h b/mlir/include/mlir/Dialect/Bufferization/IR/BufferizableOpInterface.h
--- a/mlir/include/mlir/Dialect/Bufferization/IR/BufferizableOpInterface.h
+++ b/mlir/include/mlir/Dialect/Bufferization/IR/BufferizableOpInterface.h
@@ -302,7 +302,7 @@
 
 /// Specify fine-grain relationship between buffers to enable more analysis.
 enum class BufferRelation {
-  None,
+  Unknown,
   // TODO: ResultContainsOperand,
   // TODO: OperandContainsResult,
   Equivalent
diff --git a/mlir/lib/Dialect/Arith/Transforms/BufferizableOpInterfaceImpl.cpp b/mlir/lib/Dialect/Arith/Transforms/BufferizableOpInterfaceImpl.cpp
--- a/mlir/lib/Dialect/Arith/Transforms/BufferizableOpInterfaceImpl.cpp
+++ b/mlir/lib/Dialect/Arith/Transforms/BufferizableOpInterfaceImpl.cpp
@@ -202,7 +202,7 @@
 
   BufferRelation bufferRelation(Operation *op, OpResult opResult,
                                 const AnalysisState &state) const {
-    return BufferRelation::None;
+    return BufferRelation::Unknown;
   }
 };
 
diff --git a/mlir/lib/Dialect/Bufferization/Transforms/FuncBufferizableOpInterfaceImpl.cpp b/mlir/lib/Dialect/Bufferization/Transforms/FuncBufferizableOpInterfaceImpl.cpp
--- a/mlir/lib/Dialect/Bufferization/Transforms/FuncBufferizableOpInterfaceImpl.cpp
+++ b/mlir/lib/Dialect/Bufferization/Transforms/FuncBufferizableOpInterfaceImpl.cpp
@@ -236,7 +236,7 @@
     if (getFuncOpAnalysisState(state, funcOp) !=
         FuncOpAnalysisState::Analyzed) {
       // Function not analyzed yet. The conservative answer is "None".
-      return BufferRelation::None;
+      return BufferRelation::Unknown;
     }
 
     const FuncAnalysisState &funcState = getFuncAnalysisState(state);
@@ -253,7 +253,7 @@
 #endif
       return BufferRelation::Equivalent;
     }
-    return BufferRelation::None;
+    return BufferRelation::Unknown;
   }
 
   /// All function arguments are writable. It is the responsibility of the
diff --git a/mlir/lib/Dialect/SCF/Transforms/BufferizableOpInterfaceImpl.cpp b/mlir/lib/Dialect/SCF/Transforms/BufferizableOpInterfaceImpl.cpp
--- a/mlir/lib/Dialect/SCF/Transforms/BufferizableOpInterfaceImpl.cpp
+++ b/mlir/lib/Dialect/SCF/Transforms/BufferizableOpInterfaceImpl.cpp
@@ -312,7 +312,8 @@
     assert(yieldValues.size() == 2 && "expected 2 yield values");
     bool equivalentYields = state.areEquivalentBufferizedValues(
         yieldValues[0]->get(), yieldValues[1]->get());
-    return equivalentYields ? BufferRelation::Equivalent : BufferRelation::None;
+    return equivalentYields ? BufferRelation::Equivalent
+                            : BufferRelation::Unknown;
   }
 };
 
@@ -502,7 +503,8 @@
         cast<scf::YieldOp>(forOp.getLoopBody().front().getTerminator());
     bool equivalentYield = state.areEquivalentBufferizedValues(
         bbArg, yieldOp->getOperand(opResult.getResultNumber()));
-    return equivalentYield ? BufferRelation::Equivalent : BufferRelation::None;
+    return equivalentYield ? BufferRelation::Equivalent
+                           : BufferRelation::Unknown;
   }
 
   bool isWritable(Operation *op, Value value,
@@ -723,10 +725,10 @@
 
     // The "before" region bbArgs and the OpResults may not match.
     if (resultNumber >= whileOp.getBeforeArguments().size())
-      return BufferRelation::None;
+      return BufferRelation::Unknown;
     if (opResult.getType() !=
         whileOp.getBeforeArguments()[resultNumber].getType())
-      return BufferRelation::None;
+      return BufferRelation::Unknown;
 
     auto conditionOp = whileOp.getConditionOp();
     BlockArgument conditionBbArg = whileOp.getBeforeArguments()[resultNumber];
@@ -741,7 +743,7 @@
         state.areEquivalentBufferizedValues(bodyBbArg, yieldOperand);
 
     return equivCondition && equivYield ? BufferRelation::Equivalent
-                                        : BufferRelation::None;
+                                        : BufferRelation::Unknown;
   }
 
   bool isWritable(Operation *op, Value value,
diff --git a/mlir/lib/Dialect/Tensor/Transforms/BufferizableOpInterfaceImpl.cpp b/mlir/lib/Dialect/Tensor/Transforms/BufferizableOpInterfaceImpl.cpp
--- a/mlir/lib/Dialect/Tensor/Transforms/BufferizableOpInterfaceImpl.cpp
+++ b/mlir/lib/Dialect/Tensor/Transforms/BufferizableOpInterfaceImpl.cpp
@@ -333,7 +333,7 @@
 
   BufferRelation bufferRelation(Operation *op, OpResult opResult,
                                 const AnalysisState &state) const {
-    return BufferRelation::None;
+    return BufferRelation::Unknown;
   }
 
   LogicalResult bufferize(Operation *op, RewriterBase &rewriter,