The tests are built on per architecture basis. When unsupported architecture is specified, it has no tests and TEST_GEN_PROGS is empty. The lib.mk has support for not building anything for such case. But KVM makefile doesn't handle such case correctly. It doesn't check if TEST_GEN_PROGS is empty or not and try to create directory by mkdir. Hence mkdir generates the error. mkdir: missing operand Try 'mkdir --help' for more information. This can be easily fixed by checking if TEST_GEN_PROGS isn't empty before calling mkdir. Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx> Cc: Sean Christopherson <seanjc@xxxxxxxxxx> Signed-off-by: Muhammad Usama Anjum <usama.anjum@xxxxxxxxxxxxx> --- Changes since v1: - Instead of ignoring error, check TEST_GEN_PROGS's validity first --- tools/testing/selftests/kvm/Makefile | 2 ++ 1 file changed, 2 insertions(+) diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile index 48d32c5aa3eb7..9f8ed82ff1d65 100644 --- a/tools/testing/selftests/kvm/Makefile +++ b/tools/testing/selftests/kvm/Makefile @@ -317,7 +317,9 @@ $(LIBKVM_S_OBJ): $(OUTPUT)/%.o: %.S $(GEN_HDRS) $(LIBKVM_STRING_OBJ): $(OUTPUT)/%.o: %.c $(CC) $(CFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c -ffreestanding $< -o $@ +ifneq ($(strip $(TEST_GEN_PROGS)),) $(shell mkdir -p $(sort $(dir $(TEST_GEN_PROGS)))) +endif $(SPLIT_TEST_GEN_OBJ): $(GEN_HDRS) $(TEST_GEN_PROGS): $(LIBKVM_OBJS) $(TEST_GEN_PROGS_EXTENDED): $(LIBKVM_OBJS) -- 2.39.2
