diff --git a/llvm/lib/MC/MCSubtargetInfo.cpp b/llvm/lib/MC/MCSubtargetInfo.cpp
--- a/llvm/lib/MC/MCSubtargetInfo.cpp
+++ b/llvm/lib/MC/MCSubtargetInfo.cpp
@@ -311,10 +311,7 @@
   const SubtargetSubTypeKV *CPUEntry = Find(CPU, ProcDesc);
 
   if (!CPUEntry) {
-    if (CPU != "help") // Don't error if the user asked for help.
-      errs() << "'" << CPU
-             << "' is not a recognized processor for this target"
-             << " (ignoring processor)\n";
+    // A warning for this was already printed in getFeatures()
     return MCSchedModel::GetDefaultSchedModel();
   }
   assert(CPUEntry->SchedModel && "Missing processor SchedModel value");
diff --git a/llvm/test/tools/llvm-objdump/warn-mattr-unrecognized.test b/llvm/test/tools/llvm-objdump/warn-mattr-unrecognized.test
new file mode 100644
--- /dev/null
+++ b/llvm/test/tools/llvm-objdump/warn-mattr-unrecognized.test
@@ -0,0 +1,15 @@
+# RUN: yaml2obj %s -o %t
+# RUN: llvm-objdump -d %t --mcpu=alderlake --mattr=not-an-attr 2>&1 | FileCheck %s
+# REQUIRES: x86-registered-target
+
+# CHECK: '+not-an-attr' is not a recognized feature for this target (ignoring feature)
+# CHECK-EMPTY:
+## To check we still disassemble the file
+# CHECK-NEXT: file format elf64-x86-64
+
+--- !ELF
+FileHeader:
+  Class:           ELFCLASS64
+  Data:            ELFDATA2LSB
+  Type:            ET_EXEC
+  Machine:         EM_X86_64
diff --git a/llvm/test/tools/llvm-objdump/warn-mcpu-unrecognized.test b/llvm/test/tools/llvm-objdump/warn-mcpu-unrecognized.test
new file mode 100644
--- /dev/null
+++ b/llvm/test/tools/llvm-objdump/warn-mcpu-unrecognized.test
@@ -0,0 +1,15 @@
+# RUN: yaml2obj %s -o %t
+# RUN: llvm-objdump -d %t --mcpu=not-a-cpu 2>&1 | FileCheck %s
+# REQUIRES: x86-registered-target
+
+# CHECK: 'not-a-cpu' is not a recognized processor for this target (ignoring processor)
+# CHECK-EMPTY:
+## To check we still disassemble the file
+# CHECK-NEXT: file format elf64-x86-64
+
+--- !ELF
+FileHeader:
+  Class:           ELFCLASS64
+  Data:            ELFDATA2LSB
+  Type:            ET_EXEC
+  Machine:         EM_X86_64