diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -4916,16 +4916,8 @@
                                options::OPT_fno_split_machine_functions)) {
     // This codegen pass is only available on x86-elf targets.
     if (Triple.isX86() && Triple.isOSBinFormatELF()) {
-      if (A->getOption().matches(options::OPT_fsplit_machine_functions)) {
-        // If the flag is enabled but no profile information is available then
-        // emit a warning.
-        if (getLastProfileUseArg(Args) || getLastProfileSampleUseArg(Args)) {
-          A->render(Args, CmdArgs);
-        } else {
-          D.Diag(diag::warn_drv_diagnostics_hotness_requires_pgo)
-              << A->getAsString(Args);
-        }
-      }
+      if (A->getOption().matches(options::OPT_fsplit_machine_functions))
+        A->render(Args, CmdArgs);
     } else {
       D.Diag(diag::err_drv_unsupported_opt_for_target)
           << A->getAsString(Args) << TripleStr;
diff --git a/clang/test/Driver/fsplit-machine-functions.c b/clang/test/Driver/fsplit-machine-functions.c
--- a/clang/test/Driver/fsplit-machine-functions.c
+++ b/clang/test/Driver/fsplit-machine-functions.c
@@ -1,9 +1,8 @@
 // RUN: %clang -### -target x86_64 -fprofile-use=default.profdata -fsplit-machine-functions %s -c 2>&1 | FileCheck -check-prefix=CHECK-OPT %s
+// RUN: %clang -### -target x86_64 -fsplit-machine-functions %s -c 2>&1 | FileCheck -check-prefix=CHECK-OPT %s
 // RUN: %clang -### -target x86_64 -fprofile-use=default.profdata -fsplit-machine-functions -fno-split-machine-functions %s -c 2>&1 | FileCheck -check-prefix=CHECK-NOOPT %s
-// RUN: %clang -### -target x86_64 -fsplit-machine-functions %s 2>&1 | FileCheck -check-prefix=CHECK-WARN %s
 // RUN: not %clang -c -target arm-unknown-linux -fsplit-machine-functions %s 2>&1 | FileCheck -check-prefix=CHECK-TRIPLE %s
 
 // CHECK-OPT:       "-fsplit-machine-functions"
 // CHECK-NOOPT-NOT: "-fsplit-machine-functions"
-// CHECK-WARN:      warning: argument '-fsplit-machine-functions' requires profile-guided optimization information
 // CHECK-TRIPLE:    error: unsupported option '-fsplit-machine-functions' for target