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

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Message-ID: <ca500f5c-57e7-43bc-9a1a-015021582af2@collabora.com>
Date: Wed, 7 Aug 2024 11:08:43 +0500
From: Muhammad Usama Anjum <Usama.Anjum@...labora.com>
To: Paolo Bonzini <pbonzini@...hat.com>,
 Shuah Khan <skhan@...uxfoundation.org>
Cc: Usama.Anjum@...labora.com, kernel@...labora.com, kvm@...r.kernel.org,
 linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
 Shuah Khan <shuah@...nel.org>
Subject: Re: [PATCH] selftests: kvm: fix mkdir error when building for
 non-supported arch

On 8/6/24 9:00 PM, Shuah Khan wrote:
> On 8/6/24 06:10, Muhammad Usama Anjum wrote:
>> The mkdir generates an error when kvm suite is build for non-supported
> 
> built
> unsupported
> 
>> architecture such as arm. Fix it by ignoring the error from mkdir.
>>
>> mkdir: missing operand
>> Try 'mkdir --help' for more information.
> 
> Simply suppressing the message isn't a good fix. Can you investigate
> a bit more on why mkdir is failing and the architectures it is failing
> on?
> 
> This change simply suppresses the error message and continues - Should
> this error end the build process or not run mkdir to begin with by
> checking why $(sort $(dir $(TEST_GEN_PROGS)))) results in an empty
> string?
The tests are specified on per architecture basis. As KVM isn't supported on arm, there are no tests in TEST_GEN_PROGS and it is empty. While lib.mk infrastructure has support to ignore and not build anything in such cases, the Makefile's behaviour isn't robust enough.

I think the better fix would be to check if TEST_GEN_PROGS isn't empty and then call mkdir. I'll reiterate and send the fix.

> 
>>
>> Signed-off-by: Muhammad Usama Anjum <usama.anjum@...labora.com>
>> ---
>>   tools/testing/selftests/kvm/Makefile | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
>> index 48d32c5aa3eb7..8ff46a0a8d1cd 100644
>> --- a/tools/testing/selftests/kvm/Makefile
>> +++ b/tools/testing/selftests/kvm/Makefile
>> @@ -317,7 +317,7 @@ $(LIBKVM_S_OBJ): $(OUTPUT)/%.o: %.S $(GEN_HDRS)
>>   $(LIBKVM_STRING_OBJ): $(OUTPUT)/%.o: %.c
>>       $(CC) $(CFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c -ffreestanding $< -o $@
>>   -$(shell mkdir -p $(sort $(dir $(TEST_GEN_PROGS))))
>> +$(shell mkdir -p $(sort $(dir $(TEST_GEN_PROGS))) > /dev/null 2>&1)
>>   $(SPLIT_TEST_GEN_OBJ): $(GEN_HDRS)
>>   $(TEST_GEN_PROGS): $(LIBKVM_OBJS)
>>   $(TEST_GEN_PROGS_EXTENDED): $(LIBKVM_OBJS)
> 
> 
> thanks,
> -- Shuah

-- 
BR,
Muhammad Usama Anjum