diff --git a/llvm/lib/Transforms/IPO/AttributorAttributes.cpp b/llvm/lib/Transforms/IPO/AttributorAttributes.cpp
--- a/llvm/lib/Transforms/IPO/AttributorAttributes.cpp
+++ b/llvm/lib/Transforms/IPO/AttributorAttributes.cpp
@@ -5200,8 +5200,9 @@
           auto Remark = [&](OptimizationRemarkMissed ORM) {
             return ORM << "Could not move globalized variable to the stack. "
                        << "Variable is potentially "
-                       << ((!NoCaptureAA.isAssumedNoCapture()) ? "captured."
-                                                               : "freed.");
+                       << (!NoCaptureAA.isAssumedNoCapture() ? "captured. "
+                                                             : "freed. ")
+                       << "Mark as noescape to override.";
           };
 
           LibFunc IsAllocShared;
diff --git a/llvm/lib/Transforms/IPO/OpenMPOpt.cpp b/llvm/lib/Transforms/IPO/OpenMPOpt.cpp
--- a/llvm/lib/Transforms/IPO/OpenMPOpt.cpp
+++ b/llvm/lib/Transforms/IPO/OpenMPOpt.cpp
@@ -2634,6 +2634,8 @@
   if (DisableOpenMPOptimizations)
     return PreservedAnalyses::all();
 
+  FunctionAnalysisManager &FAM =
+      AM.getResult<FunctionAnalysisManagerModuleProxy>(M).getManager();
   KernelSet Kernels = getDeviceKernels(M);
 
   auto IsCalled = [&](Function &F) {
@@ -2645,14 +2647,27 @@
     return false;
   };
 
+  auto EmitRemark = [&](Function &F) {
+    auto &ORE = FAM.getResult<OptimizationRemarkEmitterAnalysis>(F);
+    ORE.emit([&]() {
+      OptimizationRemarkMissed ORM(DEBUG_TYPE, "InternalizationFailure", &F);
+      return ORM << "Could not internalize function. "
+                 << "Some optimizations may not be possible.";
+    });
+  };
+
   // Create internal copies of each function if this is a kernel Module. This
   // allows iterprocedural passes to see every call edge.
   DenseSet<const Function *> InternalizedFuncs;
   if (isOpenMPDevice(M))
     for (Function &F : M)
-      if (!F.isDeclaration() && !Kernels.contains(&F) && IsCalled(F))
-        if (Attributor::internalizeFunction(F, /* Force */ true))
+      if (!F.isDeclaration() && !Kernels.contains(&F) && IsCalled(F)) {
+        if (Attributor::internalizeFunction(F, /* Force */ true)) {
           InternalizedFuncs.insert(&F);
+        } else if (!F.hasLocalLinkage()) {
+          EmitRemark(F);
+        }
+      }
 
   // Look at every function in the Module unless it was internalized.
   SmallVector<Function *, 16> SCC;
@@ -2663,9 +2678,6 @@
   if (SCC.empty())
     return PreservedAnalyses::all();
 
-  FunctionAnalysisManager &FAM =
-      AM.getResult<FunctionAnalysisManagerModuleProxy>(M).getManager();
-
   AnalysisGetter AG(FAM);
 
   auto OREGetter = [&FAM](Function *F) -> OptimizationRemarkEmitter & {
diff --git a/llvm/test/Transforms/OpenMP/remove_globalization.ll b/llvm/test/Transforms/OpenMP/remove_globalization.ll
--- a/llvm/test/Transforms/OpenMP/remove_globalization.ll
+++ b/llvm/test/Transforms/OpenMP/remove_globalization.ll
@@ -4,7 +4,7 @@
 target datalayout = "e-i64:64-i128:128-v16:16-v32:32-n16:32:64"
 target triple = "nvptx64"
 
-; CHECK-REMARKS: remark: remove_globalization.c:4:2: Could not move globalized variable to the stack. Variable is potentially captured.
+; CHECK-REMARKS: remark: remove_globalization.c:4:2: Could not move globalized variable to the stack. Variable is potentially captured. Mark as noescape to override.
 ; CHECK-REMARKS: remark: remove_globalization.c:2:2: Moving globalized variable to the stack.
 ; CHECK-REMARKS: remark: remove_globalization.c:6:2: Moving globalized variable to the stack.
 
diff --git a/llvm/test/Transforms/OpenMP/single_threaded_execution.ll b/llvm/test/Transforms/OpenMP/single_threaded_execution.ll
--- a/llvm/test/Transforms/OpenMP/single_threaded_execution.ll
+++ b/llvm/test/Transforms/OpenMP/single_threaded_execution.ll
@@ -1,4 +1,5 @@
 ; RUN: opt -passes=openmp-opt -debug-only=openmp-opt -disable-output < %s 2>&1 | FileCheck %s
+; RUN: opt -passes=openmp-opt -pass-remarks-missed=openmp-opt -disable-output < %s 2>&1 | FileCheck %s --check-prefix=REMARKS
 ; REQUIRES: asserts
 ; ModuleID = 'single_threaded_exeuction.c'
 
@@ -9,6 +10,8 @@
   ret void
 }
 
+; REMARKS: remark: single_threaded_execution.c:1:0: Could not internalize function. Some optimizations may not be possible.
+
 ; CHECK-NOT: [openmp-opt] Basic block @nvptx entry is executed by a single thread.
 ; CHECK: [openmp-opt] Basic block @nvptx if.then is executed by a single thread.
 ; CHECK-NOT: [openmp-opt] Basic block @nvptx if.end is executed by a single thread.
@@ -22,6 +25,7 @@
 if.then:
   call void @foo()
   call void @bar()
+  call void @baz()
   br label %if.end
 
 if.end:
@@ -41,6 +45,7 @@
 if.then:
   call void @foo()
   call void @bar()
+  call void @baz()
   br label %if.end
 
 if.end:
@@ -61,6 +66,13 @@
   ret void
 }
 
+; CHECK-NOT: [openmp-opt] Basic block @baz entry is executed by a single thread.
+; Function Attrs: noinline
+define weak void @baz() !dbg !8 {
+entry:
+  ret void
+}
+
 declare i32 @llvm.nvvm.read.ptx.sreg.tid.x()
 
 declare i32 @llvm.amdgcn.workitem.id.x()
@@ -80,3 +92,6 @@
 !5 = !{i32 7, !"openmp", i32 50}
 !6 = !{i32 7, !"openmp-device", i32 50}
 !7 = !{void ()* @kernel, !"kernel", i32 1}
+!8 = distinct !DISubprogram(name: "bar", scope: !1, file: !1, line: 8, type: !9, scopeLine: 1, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !2)
+!9 = !DISubroutineType(types: !2)
+!10 = !DILocation(line: 5, column: 7, scope: !8)