Index: lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
===================================================================
--- lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
+++ lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
@@ -319,16 +319,36 @@
       });
 }
 
+/// Predicate for Internalize pass.
+bool mustPreserveGV(const GlobalValue &GV) {
+  if (const Function *F = dyn_cast<Function>(&GV)) {
+    if (F->isDeclaration() || AMDGPU::isEntryFunctionCC(F->getCallingConv()))
+      return true;
+  }
+
+  return !GV.use_empty();
+}
+
 void AMDGPUTargetMachine::adjustPassManager(PassManagerBuilder &Builder) {
   Builder.DivergentTarget = true;
 
   bool EnableOpt = getOptLevel() > CodeGenOpt::None;
-  bool Internalize = InternalizeSymbols && EnableOpt &&
-                     (getTargetTriple().getArch() == Triple::amdgcn);
+  bool Internalize = InternalizeSymbols;
   bool EarlyInline = EarlyInlineAll && EnableOpt;
   bool AMDGPUAA = EnableAMDGPUAliasAnalysis && EnableOpt;
   bool LibCallSimplify = EnableLibCallSimplify && EnableOpt;
 
+  if (Internalize) {
+    // If we're generating code, we always have the whole program available. The
+    // relocations expected for externally visible functions aren't supported,
+    // so make sure every non-entry function is hidden.
+    Builder.addExtension(
+      PassManagerBuilder::EP_EnabledOnOptLevel0,
+      [](const PassManagerBuilder &, legacy::PassManagerBase &PM) {
+        PM.add(createInternalizePass(mustPreserveGV));
+      });
+  }
+
   Builder.addExtension(
     PassManagerBuilder::EP_ModuleOptimizerEarly,
     [Internalize, EarlyInline, AMDGPUAA](const PassManagerBuilder &,
@@ -339,25 +359,7 @@
       }
       PM.add(createAMDGPUUnifyMetadataPass());
       if (Internalize) {
-        PM.add(createInternalizePass([=](const GlobalValue &GV) -> bool {
-          if (const Function *F = dyn_cast<Function>(&GV)) {
-            if (F->isDeclaration())
-                return true;
-            switch (F->getCallingConv()) {
-            default:
-              return false;
-            case CallingConv::AMDGPU_VS:
-            case CallingConv::AMDGPU_HS:
-            case CallingConv::AMDGPU_GS:
-            case CallingConv::AMDGPU_PS:
-            case CallingConv::AMDGPU_CS:
-            case CallingConv::AMDGPU_KERNEL:
-            case CallingConv::SPIR_KERNEL:
-              return true;
-            }
-          }
-          return !GV.use_empty();
-        }));
+        PM.add(createInternalizePass(mustPreserveGV));
         PM.add(createGlobalDCEPass());
       }
       if (EarlyInline)
Index: test/CodeGen/AMDGPU/internalize.ll
===================================================================
--- test/CodeGen/AMDGPU/internalize.ll
+++ test/CodeGen/AMDGPU/internalize.ll
@@ -1,35 +1,46 @@
-; RUN: opt -O1 -S -mtriple=amdgcn-unknown-amdhsa -amdgpu-internalize-symbols < %s | FileCheck %s
-; CHECK-NOT: unused
-; CHECK-NOT: foo_used
-; CHECK: gvar_used
-; CHECK: main_kernel
+; RUN: opt -O1 -S -mtriple=amdgcn-unknown-amdhsa -amdgpu-internalize-symbols < %s | FileCheck -check-prefix=ALL -check-prefix=OPT %s
+; RUN: opt -O0 -S -mtriple=amdgcn-unknown-amdhsa -amdgpu-internalize-symbols < %s | FileCheck -check-prefix=ALL -check-prefix=OPTNONE %s
+
+; OPT-NOT: gvar_unused
+; OPTNONE: gvar_unused
 
 @gvar_unused = addrspace(1) global i32 undef, align 4
+
+; CHECK: gvar_used
 @gvar_used = addrspace(1) global i32 undef, align 4
 
-; Function Attrs: alwaysinline nounwind
+; CHECK: define internal void @func_used(
+define void @func_used(i32 addrspace(1)* %out, i32 %tid) #2 {
+entry:
+  store i32 %tid, i32 addrspace(1)* %out
+  ret void
+}
+
+; CHECK: define amdgpu_kernel void @foo_unused(
 define amdgpu_kernel void @foo_unused(i32 addrspace(1)* %out) local_unnamed_addr #1 {
 entry:
   store i32 1, i32 addrspace(1)* %out
   ret void
 }
 
-; Function Attrs: alwaysinline nounwind
+; CHECK: define amdgpu_kernel void @foo_used(
 define amdgpu_kernel void @foo_used(i32 addrspace(1)* %out, i32 %tid) local_unnamed_addr #1 {
 entry:
   store i32 %tid, i32 addrspace(1)* %out
   ret void
 }
 
+; CHECK: define amdgpu_kernel void @main_kernel()
 define amdgpu_kernel void @main_kernel() {
 entry:
   %tid = call i32 @llvm.amdgcn.workitem.id.x()
-  tail call void @foo_used(i32 addrspace(1)* @gvar_used, i32 %tid) nounwind
+  tail call void @foo_used(i32 addrspace(1)* @gvar_used, i32 %tid)
+  tail call void @func_used(i32 addrspace(1)* @gvar_used, i32 %tid)
   ret void
 }
 
 declare i32 @llvm.amdgcn.workitem.id.x() #0
 
 attributes #0 = { nounwind readnone }
-
 attributes #1 = { alwaysinline nounwind }
+attributes #2 = { noinline nounwind }