linux-kernel - Re: [PATCH v2] selftests/livepatch: adopt to newer sysctl error format

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Date:   Tue, 14 Jul 2020 08:36:30 -0400
From:   Joe Lawrence <joe.lawrence@...hat.com>
To:     Petr Mladek <pmladek@...e.com>,
        Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Jiri Kosina <jikos@...nel.org>, Miroslav Benes <mbenes@...e.cz>
Cc:     Shuah Khan <shuah@...nel.org>, live-patching@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] selftests/livepatch: adopt to newer sysctl error
 format

On 7/14/20 5:10 AM, Petr Mladek wrote:
> With procfs v3.3.16, the sysctl command doesn't print the set key and
> value on error.  This change breaks livepatch selftest test-ftrace.sh,
> that tests the interaction of sysctl ftrace_enabled:
> 
> Make it work with all sysctl versions using '-q' option.
> 
> Explicitly print the final status on success so that it can be verified
> in the log. The error message is enough on failure.
> 
> Reported-by: Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
> Signed-off-by: Petr Mladek <pmladek@...e.com>
> ---
> The patch has been created against livepatch.git,
> branch for-5.9/selftests-cleanup. But it applies also against
> the current Linus' tree.
> 
> tools/testing/selftests/livepatch/functions.sh   | 3 ++-
>   tools/testing/selftests/livepatch/test-ftrace.sh | 2 +-
>   2 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/testing/selftests/livepatch/functions.sh b/tools/testing/selftests/livepatch/functions.sh
> index 408529d94ddb..1aba83c87ad3 100644
> --- a/tools/testing/selftests/livepatch/functions.sh
> +++ b/tools/testing/selftests/livepatch/functions.sh
> @@ -75,7 +75,8 @@ function set_dynamic_debug() {
>   }
>   
>   function set_ftrace_enabled() {
> -	result=$(sysctl kernel.ftrace_enabled="$1" 2>&1 | paste --serial --delimiters=' ')
> +	result=$(sysctl -q kernel.ftrace_enabled="$1" 2>&1 && \
> +		 sysctl kernel.ftrace_enabled 2>&1)
>   	echo "livepatch: $result" > /dev/kmsg
>   }
>   
> diff --git a/tools/testing/selftests/livepatch/test-ftrace.sh b/tools/testing/selftests/livepatch/test-ftrace.sh
> index 9160c9ec3b6f..552e165512f4 100755
> --- a/tools/testing/selftests/livepatch/test-ftrace.sh
> +++ b/tools/testing/selftests/livepatch/test-ftrace.sh
> @@ -51,7 +51,7 @@ livepatch: '$MOD_LIVEPATCH': initializing patching transition
>   livepatch: '$MOD_LIVEPATCH': starting patching transition
>   livepatch: '$MOD_LIVEPATCH': completing patching transition
>   livepatch: '$MOD_LIVEPATCH': patching complete
> -livepatch: sysctl: setting key \"kernel.ftrace_enabled\": Device or resource busy kernel.ftrace_enabled = 0
> +livepatch: sysctl: setting key \"kernel.ftrace_enabled\": Device or resource busy
>   % echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
>   livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
>   livepatch: '$MOD_LIVEPATCH': starting unpatching transition
> 

Looks good, thanks.

Reviewed-by: Joe Lawrence <joe.lawrence@...hat.com>

-- Joe