Re: [PATCH stable 6.6 6.12 1/1] selftests/bpf: Check for timeout in perf_link test

[Greg KH <greg@kroah.com>]

On Mon, Jun 09, 2025 at 01:29:38PM +0800, Shung-Hsi Yu wrote:
> From: Ihor Solodrai <ihor.solodrai@pm.me>
> 
> Recently perf_link test started unreliably failing on libbpf CI:
>   * https://github.com/libbpf/libbpf/actions/runs/11260672407/job/31312405473
>   * https://github.com/libbpf/libbpf/actions/runs/11260992334/job/31315514626
>   * https://github.com/libbpf/libbpf/actions/runs/11263162459/job/31320458251
> 
> Part of the test is running a dummy loop for a while and then checking
> for a counter incremented by the test program.
> 
> Instead of waiting for an arbitrary number of loop iterations once,
> check for the test counter in a loop and use get_time_ns() helper to
> enforce a 100ms timeout.
> 
> v1: https://lore.kernel.org/bpf/zuRd072x9tumn2iN4wDNs5av0nu5nekMNV4PkR-YwCT10eFFTrUtZBRkLWFbrcCe7guvLStGQlhibo8qWojCO7i2-NGajes5GYIyynexD-w=@pm.me/
> 
> Signed-off-by: Ihor Solodrai <ihor.solodrai@pm.me>
> Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
> Link: https://lore.kernel.org/bpf/20241011153104.249800-1-ihor.solodrai@pm.me
> Signed-off-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
> ---
>  .../testing/selftests/bpf/prog_tests/perf_link.c  | 15 +++++++++++++--
>  1 file changed, 13 insertions(+), 2 deletions(-)
> 

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>