diff --git a/llvm/include/llvm/ProfileData/SampleProf.h b/llvm/include/llvm/ProfileData/SampleProf.h
--- a/llvm/include/llvm/ProfileData/SampleProf.h
+++ b/llvm/include/llvm/ProfileData/SampleProf.h
@@ -527,14 +527,20 @@
                             uint64_t Threshold) const {
     if (TotalSamples <= Threshold)
       return;
-    S.insert(getGUID(Name));
+    auto isDeclaration = [](const Function *F) {
+      return !F || F->isDeclaration();
+    };
+    if (isDeclaration(M->getFunction(getFuncName()))) {
+      // Add to the import list only when it's defined out of module.
+      S.insert(getGUID(Name));
+    }
     // Import hot CallTargets, which may not be available in IR because full
     // profile annotation cannot be done until backend compilation in ThinLTO.
     for (const auto &BS : BodySamples)
       for (const auto &TS : BS.second.getCallTargets())
         if (TS.getValue() > Threshold) {
           const Function *Callee = M->getFunction(getFuncName(TS.getKey()));
-          if (!Callee || !Callee->getSubprogram())
+          if (isDeclaration(Callee))
             S.insert(getGUID(TS.getKey()));
         }
     for (const auto &CS : CallsiteSamples)
diff --git a/llvm/test/Transforms/SampleProfile/Inputs/function_metadata.compact.afdo b/llvm/test/Transforms/SampleProfile/Inputs/function_metadata.compact.afdo
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000
GIT binary patch
literal 0
Hc$@<O00001

literal 0
Hc$@<O00001

diff --git a/llvm/test/Transforms/SampleProfile/Inputs/function_metadata.prof b/llvm/test/Transforms/SampleProfile/Inputs/function_metadata.prof
--- a/llvm/test/Transforms/SampleProfile/Inputs/function_metadata.prof
+++ b/llvm/test/Transforms/SampleProfile/Inputs/function_metadata.prof
@@ -13,5 +13,6 @@
   1: 1000 foo3:1000
 test_liveness:1000:0
  1: foo:1000
-  1: foo_available:1000
+  1: bar:1000
+   1: 2000 bar_dbg:1000 bar_available:1000
    2: 1000
diff --git a/llvm/test/Transforms/SampleProfile/function_metadata.ll b/llvm/test/Transforms/SampleProfile/function_metadata.ll
--- a/llvm/test/Transforms/SampleProfile/function_metadata.ll
+++ b/llvm/test/Transforms/SampleProfile/function_metadata.ll
@@ -6,7 +6,11 @@
 
 declare void @foo()
 
-define void @foo_available() !dbg !11 {
+declare void @bar()
+
+declare !dbg !13 void @bar_dbg()
+
+define void @bar_available() !dbg !14 {
   ret void
 }
 
@@ -33,10 +37,10 @@
 ; metadata.
 ; CHECK: ![[ENTRY_TEST]] = !{!"function_entry_count", i64 1, i64 2494702099028631698, i64 6699318081062747564, i64 7682762345278052905,  i64 -7908226060800700466, i64 -2012135647395072713}
 
-; Check GUIDs for both foo and foo_available are included in the metadata to
+; Check GUIDs for foo, bar and bar_dbg are included in the metadata to
 ; make sure the liveness analysis can capture the dependency from test_liveness
-; to foo_available.
-; CHECK: ![[ENTRY_TEST_LIVENESS]] = !{!"function_entry_count", i64 1, i64 4005816710939881937, i64 6699318081062747564}
+; to bar. bar_available should not be included as it's within the same module.
+; CHECK: ![[ENTRY_TEST_LIVENESS]] = !{!"function_entry_count", i64 1, i64 6699318081062747564, i64 -2012135647395072713, i64 -1522495160813492905}
 
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!8, !9}
@@ -50,8 +54,9 @@
 !8 = !{i32 2, !"Dwarf Version", i32 4}
 !9 = !{i32 1, !"Debug Info Version", i32 3}
 !10 = !{!"clang version 3.5 "}
-!11 = distinct !DISubprogram(name: "foo_available", line: 7, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 7, file: !1, scope: !1, type: !6, retainedNodes: !2)
 !12 = distinct !DISubprogram(name: "test_liveness", line: 7, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 7, file: !1, scope: !1, type: !6, retainedNodes: !2)
+!13 = !DISubprogram(name: "bar_dbg", scope: !1, file: !1, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
+!14 = distinct !DISubprogram(name: "bar_available", line: 7, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 7, file: !1, scope: !1, type: !6, retainedNodes: !2)
 !15 = !DILexicalBlockFile(discriminator: 1, file: !1, scope: !7)
 !17 = distinct !DILexicalBlock(line: 10, column: 0, file: !1, scope: !7)
 !18 = !DILocation(line: 10, scope: !17)