linux-kernel - Re: [PATCH net-next 4/4] netconsole: selftest: Validate CPU number auto-population in userdata

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Message-ID: <20241118183514.112db8b9@kernel.org>
Date: Mon, 18 Nov 2024 18:35:14 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Breno Leitao <leitao@...ian.org>
Cc: Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni
 <pabeni@...hat.com>, Simon Horman <horms@...nel.org>, Jonathan Corbet
 <corbet@....net>, Shuah Khan <shuah@...nel.org>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
 linux-kselftest@...r.kernel.org, max@...sevol.com, thepacketgeek@...il.com,
 vlad.wing@...il.com, davej@...emonkey.org.uk
Subject: Re: [PATCH net-next 4/4] netconsole: selftest: Validate CPU number
 auto-population in userdata

On Wed, 13 Nov 2024 07:10:55 -0800 Breno Leitao wrote:
> +	if ! grep -q "cpu=[0-9]\+" "${TMPFILENAME}"; then
> +		echo "FAIL: 'cpu=' not found in ${TMPFILENAME}" >&2
> +		cat "${TMPFILENAME}" >&2
> +		exit "${ksft_fail}"
> +	fi

Could we try to do something like pick a 'random' CPU ID from sysfs,
taskset the write / echo, and match that the incoming message has the
expected CPU ID, not just any?