This is basically the inverse case of commit 474eecc882ae
("selftests: livepatch: test if ftrace can trace a livepatched function")
but ensuring that livepatch would work on a traced function.

Signed-off-by: Marcos Paulo de Souza <mpdesouza@suse.com>
---
 tools/testing/selftests/livepatch/test-ftrace.sh | 36 ++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/tools/testing/selftests/livepatch/test-ftrace.sh b/tools/testing/selftests/livepatch/test-ftrace.sh
index 094176f1a46a..c6222cc037c5 100755
--- a/tools/testing/selftests/livepatch/test-ftrace.sh
+++ b/tools/testing/selftests/livepatch/test-ftrace.sh
@@ -95,4 +95,40 @@ livepatch: '$MOD_LIVEPATCH': completing unpatching transition
 livepatch: '$MOD_LIVEPATCH': unpatching complete
 % rmmod $MOD_LIVEPATCH"
 
+
+# - trace a function
+# - verify livepatch can load targgeting no the same traced function
+# - check if the livepatch is in effect
+# - reset trace and unload livepatch
+
+start_test "livepatch a traced function and check that the live patch remains in effect"
+
+FUNCTION_NAME="cmdline_proc_show"
+
+trace_function "$FUNCTION_NAME"
+load_lp $MOD_LIVEPATCH
+
+if [[ "$(cat /proc/cmdline)" == "$MOD_LIVEPATCH: this has been live patched" ]] ; then
+	log "livepatch: ok"
+fi
+
+check_traced_functions "$FUNCTION_NAME"
+
+disable_lp $MOD_LIVEPATCH
+unload_lp $MOD_LIVEPATCH
+
+check_result "% insmod test_modules/$MOD_LIVEPATCH.ko
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+livepatch: '$MOD_LIVEPATCH': patching complete
+livepatch: ok
+% echo 0 > $SYSFS_KLP_DIR/$MOD_LIVEPATCH/enabled
+livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
+livepatch: '$MOD_LIVEPATCH': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+% rmmod $MOD_LIVEPATCH"
+
 exit 0

-- 
2.52.0

On Fri 2026-02-20 11:12:33, Marcos Paulo de Souza wrote:
> This is basically the inverse case of commit 474eecc882ae
> ("selftests: livepatch: test if ftrace can trace a livepatched function")
> but ensuring that livepatch would work on a traced function.
> 
> Signed-off-by: Marcos Paulo de Souza <mpdesouza@suse.com>

Looks and works fine to me:

Reviewed-by: Petr Mladek <pmladek@suse.com>
Tested-by: Petr Mladek <pmladek@suse.com>

Best Regards,
Petr

PS: I am going to fix the typo mentioned by Joe and push this patch.

Hi,

On Fri, 20 Feb 2026, Marcos Paulo de Souza wrote:

> This is basically the inverse case of commit 474eecc882ae
> ("selftests: livepatch: test if ftrace can trace a livepatched function")
> but ensuring that livepatch would work on a traced function.
> 
> Signed-off-by: Marcos Paulo de Souza <mpdesouza@suse.com>

with the typo fix that Joe mentioned

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

M

On Fri, Feb 20, 2026 at 11:12:33AM -0300, Marcos Paulo de Souza wrote:
> This is basically the inverse case of commit 474eecc882ae
> ("selftests: livepatch: test if ftrace can trace a livepatched function")
> but ensuring that livepatch would work on a traced function.
> 
> Signed-off-by: Marcos Paulo de Souza <mpdesouza@suse.com>
> ---
>  tools/testing/selftests/livepatch/test-ftrace.sh | 36 ++++++++++++++++++++++++
>  1 file changed, 36 insertions(+)
> 
> diff --git a/tools/testing/selftests/livepatch/test-ftrace.sh b/tools/testing/selftests/livepatch/test-ftrace.sh
> index 094176f1a46a..c6222cc037c5 100755
> --- a/tools/testing/selftests/livepatch/test-ftrace.sh
> +++ b/tools/testing/selftests/livepatch/test-ftrace.sh
> @@ -95,4 +95,40 @@ livepatch: '$MOD_LIVEPATCH': completing unpatching transition
>  livepatch: '$MOD_LIVEPATCH': unpatching complete
>  % rmmod $MOD_LIVEPATCH"
>  
> +
> +# - trace a function
> +# - verify livepatch can load targgeting no the same traced function

nitpick: s/targgeting no/targeting on/ ?

Otherwise LGTM,
Acked-by: Joe Lawrence <joe.lawrence@redhat.com>

--
Joe