netdev - Re: [PATCH net-next] net: dev: Always serialize on Qdisc::busylock in __dev_xmit_skb() on PREEMPT

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Date:   Fri, 10 Dec 2021 20:32:56 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH net-next] net: dev: Always serialize on Qdisc::busylock
 in __dev_xmit_skb() on PREEMPT_RT.

On Fri, 10 Dec 2021 16:41:44 +0100 Sebastian Andrzej Siewior wrote:
> -	contended = qdisc_is_running(q);
> +	if (!IS_ENABLED(CONFIG_PREEMPT_RT))
> +		contended = qdisc_is_running(q);
> +	else
> +		contended = true;

Why not:

	contended = qdisc_is_running(q) || IS_ENABLED(CONFIG_PREEMPT_RT);