diff --git a/llvm/lib/Target/PowerPC/PPC.h b/llvm/lib/Target/PowerPC/PPC.h
--- a/llvm/lib/Target/PowerPC/PPC.h
+++ b/llvm/lib/Target/PowerPC/PPC.h
@@ -84,9 +84,9 @@
   void initializePPCLowerMASSVEntriesPass(PassRegistry &);
   extern char &PPCLowerMASSVEntriesID;
 
-  InstructionSelector *createPPCInstructionSelector(const PPCTargetMachine &,
-                                                    PPCSubtarget &,
-                                                    PPCRegisterBankInfo &);
+  InstructionSelector *
+  createPPCInstructionSelector(const PPCTargetMachine &, const PPCSubtarget &,
+                               const PPCRegisterBankInfo &);
   namespace PPCII {
 
   /// Target Operand Flag enum.
diff --git a/llvm/lib/Target/PowerPC/PPCInstructionSelector.cpp b/llvm/lib/Target/PowerPC/PPCInstructionSelector.cpp
--- a/llvm/lib/Target/PowerPC/PPCInstructionSelector.cpp
+++ b/llvm/lib/Target/PowerPC/PPCInstructionSelector.cpp
@@ -83,9 +83,10 @@
 }
 
 namespace llvm {
-InstructionSelector *createPPCInstructionSelector(const PPCTargetMachine &TM,
-                                                  PPCSubtarget &Subtarget,
-                                                  PPCRegisterBankInfo &RBI) {
+InstructionSelector *
+createPPCInstructionSelector(const PPCTargetMachine &TM,
+                             const PPCSubtarget &Subtarget,
+                             const PPCRegisterBankInfo &RBI) {
   return new PPCInstructionSelector(TM, Subtarget, RBI);
 }
 } // end namespace llvm