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SubjectRe: [PATCH v2] selftests/livepatch: adopt to newer sysctl error format
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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@linux.vnet.ibm.com>
> Signed-off-by: Petr Mladek <pmladek@suse.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@redhat.com>

-- Joe

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