[PATCH v2] selftests/livepatch: adopt to newer sysctl error format

[PATCH v2] selftests/livepatch: adopt to newer sysctl error format

[Petr Mladek]

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
-- 
2.26.2

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

[Kamalesh Babulal]

On 14/07/20 2:40 pm, 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>

Reviewed-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>

-- 
Kamalesh

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

[Joe Lawrence]

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

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

[Miroslav Benes]

On Tue, 14 Jul 2020, 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>

Acked-by: Miroslav Benes <mbenes@suse.cz>

M

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

[Petr Mladek]

On Tue 2020-07-14 11:10:30, 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 is commited in livepatch.git,
branch for-5.9/selftests-cleanup.

Best Regards,
Petr