Re: [PATCH] selftest/livepatch: Only run test-kprobe with CONFIG_KPROBES_ON_FTRACE

[Joe Lawrence <joe.lawrence@redhat.com>]

On 3/17/25 12:51, Song Liu wrote:
> CONFIG_KPROBES_ON_FTRACE is required for test-kprobe. Skip test-kprobe
> when CONFIG_KPROBES_ON_FTRACE is not set.
> 
> Signed-off-by: Song Liu <song@kernel.org>
> ---
>  tools/testing/selftests/livepatch/test-kprobe.sh | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/tools/testing/selftests/livepatch/test-kprobe.sh b/tools/testing/selftests/livepatch/test-kprobe.sh
> index 115065156016..fd823dd5dd7f 100755
> --- a/tools/testing/selftests/livepatch/test-kprobe.sh
> +++ b/tools/testing/selftests/livepatch/test-kprobe.sh
> @@ -5,6 +5,8 @@
>  
>  . $(dirname $0)/functions.sh
>  
> +zgrep KPROBES_ON_FTRACE /proc/config.gz || skip "test-kprobe requires CONFIG_KPROBES_ON_FTRACE"
> +

Hi Song,

This in turn depends on CONFIG_IKCONFIG_PROC for /proc/config.gz (not
set for RHEL distro kernels).

Is there a dynamic way to figure out CONFIG_KPROBES_ON_FTRACE support?
Without looking into it very long, maybe test_klp_kprobe.c's call to
register_kprobe() could fail with -ENOTSUPP and the test script could
gracefully skip the test?

Regards,

-- 
Joe