netdev - Re: [PATCH net 1/3] selftests: net: lib: support errexit with busywait

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Date: Wed, 5 Jun 2024 17:44:03 +0800
From: Hangbin Liu <liuhangbin@...il.com>
To: "Matthieu Baerts (NGI0)" <matttbe@...nel.org>
Cc: mptcp@...ts.linux.dev, "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Shuah Khan <shuah@...nel.org>, Petr Machata <petrm@...dia.com>,
	netdev@...r.kernel.org, linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Geliang Tang <geliang@...nel.org>
Subject: Re: [PATCH net 1/3] selftests: net: lib: support errexit with
 busywait

On Wed, Jun 05, 2024 at 11:21:16AM +0200, Matthieu Baerts (NGI0) wrote:
> If errexit is enabled ('set -e'), loopy_wait -- or busywait and others
> using it -- will stop after the first failure.
> 
> Note that if the returned status of loopy_wait is checked, and even if
> errexit is enabled, Bash will not stop at the first error.
> 
> Fixes: 25ae948b4478 ("selftests/net: add lib.sh")

Not sure if the fixes tag should be c5341bcc337c ("selftests: mlxsw: Add a
self-test for port-default priority"), so the fixes could be backported to
stable kernel for forwarding/lib.sh. Others looks good to me.

Reviewed-by: Hangbin Liu <liuhangbin@...il.com>

> Cc: stable@...r.kernel.org
> Acked-by: Geliang Tang <geliang@...nel.org>
> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@...nel.org>
> ---
>  tools/testing/selftests/net/lib.sh | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/tools/testing/selftests/net/lib.sh b/tools/testing/selftests/net/lib.sh
> index edc030e81a46..a422e10d3d3a 100644
> --- a/tools/testing/selftests/net/lib.sh
> +++ b/tools/testing/selftests/net/lib.sh
> @@ -67,9 +67,7 @@ loopy_wait()
>  	while true
>  	do
>  		local out
> -		out=$("$@")
> -		local ret=$?
> -		if ((!ret)); then
> +		if out=$("$@"); then
>  			echo -n "$out"
>  			return 0
>  		fi
> 
> -- 
> 2.43.0
>