diff --git a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
--- a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -1158,12 +1158,14 @@
 }
 
 void AsmPrinter::emitPseudoProbe(const MachineInstr &MI) {
-  auto GUID = MI.getOperand(0).getImm();
-  auto Index = MI.getOperand(1).getImm();
-  auto Type = MI.getOperand(2).getImm();
-  auto Attr = MI.getOperand(3).getImm();
-  DILocation *DebugLoc = MI.getDebugLoc();
-  PP->emitPseudoProbe(GUID, Index, Type, Attr, DebugLoc);
+  if (PP) {
+    auto GUID = MI.getOperand(0).getImm();
+    auto Index = MI.getOperand(1).getImm();
+    auto Type = MI.getOperand(2).getImm();
+    auto Attr = MI.getOperand(3).getImm();
+    DILocation *DebugLoc = MI.getDebugLoc();
+    PP->emitPseudoProbe(GUID, Index, Type, Attr, DebugLoc);
+  }
 }
 
 void AsmPrinter::emitStackSizeSection(const MachineFunction &MF) {
diff --git a/llvm/lib/Linker/IRMover.cpp b/llvm/lib/Linker/IRMover.cpp
--- a/llvm/lib/Linker/IRMover.cpp
+++ b/llvm/lib/Linker/IRMover.cpp
@@ -1233,8 +1233,15 @@
       continue;
     // Don't import pseudo probe descriptors here for thinLTO. They will be
     // emitted by the originating module.
-    if (IsPerformingImport && NMD.getName() == PseudoProbeDescMetadataName)
+    if (IsPerformingImport && NMD.getName() == PseudoProbeDescMetadataName) {
+      if (!DstM.getNamedMetadata(NMD.getName()))
+        emitWarning("Pseudo-probe ignored: source module '" +
+                    SrcM->getModuleIdentifier() +
+                    "' is compiled with -fpseudo-probe-for-profiling while "
+                    "destination module '" +
+                    DstM.getModuleIdentifier() + "' is not\n");
       continue;
+    }
     NamedMDNode *DestNMD = DstM.getOrInsertNamedMetadata(NMD.getName());
     // Add Src elements into Dest node.
     for (const MDNode *Op : NMD.operands())
diff --git a/llvm/test/ThinLTO/X86/pseudo-probe-desc-import.ll b/llvm/test/ThinLTO/X86/pseudo-probe-desc-import.ll
--- a/llvm/test/ThinLTO/X86/pseudo-probe-desc-import.ll
+++ b/llvm/test/ThinLTO/X86/pseudo-probe-desc-import.ll
@@ -1,28 +1,31 @@
-; RUN: opt -module-summary %s -o %t1.bc
+; RUN: opt -module-summary -passes=pseudo-probe %s -o %t1.bc
 ; RUN: opt -module-summary %p/Inputs/pseudo-probe-desc-import.ll -o %t2.bc
 ; RUN: llvm-lto -thinlto-action=thinlink -o %t.index.bc %t1.bc %t2.bc
 
 ; Don't import pseudo probe desc.
 ; RUN: llvm-lto -thinlto-action=import %t1.bc -thinlto-index=%t.index.bc -o - | llvm-dis -o - | FileCheck %s
+
+
+; Warn that current module is not pseudo-probe instrumented.
+; RUN: opt -module-summary %s -o %t3.bc
+; RUN: llvm-lto -thinlto-action=thinlink -o %t3.index.bc %t3.bc %t2.bc
+; RUN: llvm-lto -thinlto-action=import %t3.bc -thinlto-index=%t3.index.bc -o /dev/null 2>&1 | FileCheck %s  --check-prefix=WARN
+
+
 ; CHECK-NOT: {i64 6699318081062747564, i64 4294967295, !"foo"
 ; CHECK: !{i64 -2624081020897602054, i64 281479271677951, !"main"
 
+; WARN: warning: Pseudo-probe ignored: source module '{{.*}}' is compiled with -fpseudo-probe-for-profiling while destination module '{{.*}}' is not
+
 target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
 target triple = "x86_64-unknown-linux-gnu"
 
 define i32 @main() {
 entry:
   call void (...) @foo()
-  call void @llvm.pseudoprobe(i64 -2624081020897602054, i64 1, i32 0, i64 -1)
   ret i32 0
 }
 
 declare void @foo(...)
 
-declare void @llvm.pseudoprobe(i64, i64, i32, i64) #0
-
 attributes #0 = { inaccessiblememonly nounwind willreturn }
-
-!llvm.pseudo_probe_desc = !{!0}
-
-!0 = !{i64 -2624081020897602054, i64 281479271677951, !"main", null}