linux-kernel - Re: [PATCH v2] selftests: kvm: fix mkdir error when building for unsupported arch

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Message-ID: <59d825c8-bdaf-4077-be0e-d738b42d2dab@linuxfoundation.org>
Date: Mon, 19 Aug 2024 04:01:28 -0600
From: Shuah Khan <skhan@...uxfoundation.org>
To: Muhammad Usama Anjum <usama.anjum@...labora.com>,
 Paolo Bonzini <pbonzini@...hat.com>, Shuah Khan <shuah@...nel.org>
Cc: kernel@...labora.com, Sean Christopherson <seanjc@...gle.com>,
 kvm@...r.kernel.org, linux-kselftest@...r.kernel.org,
 linux-kernel@...r.kernel.org, Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH v2] selftests: kvm: fix mkdir error when building for
 unsupported arch

On 8/19/24 03:30, Muhammad Usama Anjum wrote:
> 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@...hat.com>
> Cc: Sean Christopherson <seanjc@...gle.com>
> Signed-off-by: Muhammad Usama Anjum <usama.anjum@...labora.com>
> ---
> 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)

Looks good to me.

Reviewed-by: Shuah Khan <skhan@...uxfoundation.org>

thanks,
-- Shuah