linux-kernel - Re: [PATCH v2 21/24] selftests: memfd: return Kselftest Skip code for skipped tests

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Message-ID: <c1ad2960-7294-4370-a7b6-06a709bf247d@oracle.com>
Date:   Mon, 7 May 2018 17:20:51 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     "Shuah Khan (Samsung OSG)" <shuah@...nel.org>,
        akpm@...ux-foundation.org, marcandre.lureau@...hat.com,
        lizhijian@...fujitsu.com
Cc:     linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 21/24] selftests: memfd: return Kselftest Skip code for
 skipped tests

On 05/07/2018 04:01 PM, Shuah Khan (Samsung OSG) wrote:
> When memfd test is skipped because of unmet dependencies and/or unsupported
> configuration, it returns non-zero value which is treated as a fail by the
> Kselftest framework. This leads to false negative result even when the test
> could not be run.
> 
> Change it to return kselftest skip code when a test gets skipped to clearly
> report that the test could not be run.
> 
> Added an explicit check for root user at the start of memfd hugetlbfs test
> and return skip code if a non-root user attempts to run it.
> 
> In addition, return skip code when not enough huge pages are available to
> run the test.
> 
> Kselftest framework SKIP code is 4 and the framework prints appropriate
> messages to indicate that the test is skipped.
> 
> Signed-off-by: Shuah Khan (Samsung OSG) <shuah@...nel.org>

Thanks for making the changes!

Reviewed-by: Mike Kravetz <mike.kravetz@...cle.com>

-- 
Mike Kravetz
> ---
> 
> Changes since v1:
> -- addressed review comments on v1
> -- Fixed a regression in v1 that changed the behavior to require root
>    for all tests not just the hugetlbfs test.
> 
>  tools/testing/selftests/memfd/run_tests.sh | 14 +++++++++-----
>  1 file changed, 9 insertions(+), 5 deletions(-)
> 
> diff --git a/tools/testing/selftests/memfd/run_tests.sh b/tools/testing/selftests/memfd/run_tests.sh
> index c2d41ed81b24..2013f195e623 100755
> --- a/tools/testing/selftests/memfd/run_tests.sh
> +++ b/tools/testing/selftests/memfd/run_tests.sh
> @@ -1,6 +1,9 @@
>  #!/bin/bash
>  # please run as root
>  
> +# Kselftest framework requirement - SKIP code is 4.
> +ksft_skip=4
> +
>  #
>  # Normal tests requiring no special resources
>  #
> @@ -29,12 +32,13 @@ if [ -n "$freepgs" ] && [ $freepgs -lt $hpages_test ]; then
>  	nr_hugepgs=`cat /proc/sys/vm/nr_hugepages`
>  	hpages_needed=`expr $hpages_test - $freepgs`
>  
> +	if [ $UID != 0 ]; then
> +		echo "Please run memfd with hugetlbfs test as root"
> +		exit $ksft_skip
> +	fi
> +
>  	echo 3 > /proc/sys/vm/drop_caches
>  	echo $(( $hpages_needed + $nr_hugepgs )) > /proc/sys/vm/nr_hugepages
> -	if [ $? -ne 0 ]; then
> -		echo "Please run this test as root"
> -		exit 1
> -	fi
>  	while read name size unit; do
>  		if [ "$name" = "HugePages_Free:" ]; then
>  			freepgs=$size
> @@ -53,7 +57,7 @@ if [ $freepgs -lt $hpages_test ]; then
>  	fi
>  	printf "Not enough huge pages available (%d < %d)\n" \
>  		$freepgs $needpgs
> -	exit 1
> +	exit $ksft_skip
>  fi
>  
>  #
>