diff --git a/llvm/lib/Linker/LinkModules.cpp b/llvm/lib/Linker/LinkModules.cpp
--- a/llvm/lib/Linker/LinkModules.cpp
+++ b/llvm/lib/Linker/LinkModules.cpp
@@ -527,6 +527,12 @@
     if (linkIfNeeded(GI, GVToClone))
       return true;
 
+  // Since nocallback function attribute is treated as a hint on
+  // the module level, it is removed while linking modules.
+  for (Function &SF : *SrcM)
+    if (SF.isDeclaration() && SF.hasFnAttribute(llvm::Attribute::NoCallback))
+      SF.removeFnAttr(llvm::Attribute::NoCallback);
+
   // For a variable in a comdat nodeduplicate, its initializer should be
   // preserved (its content may be implicitly used by other members) even if
   // symbol resolution does not pick it. Clone it into an unnamed private