linux-kernel - Re: [PATCH RT] net: move xmit_recursion to per-task variable on -RT

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Date:	Wed, 13 Jan 2016 18:31:46 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
cc:	linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	Steven Rostedt <rostedt@...dmis.org>, netdev@...r.kernel.org
Subject: Re: [PATCH RT] net: move xmit_recursion to per-task variable on
 -RT

On Wed, 13 Jan 2016, Sebastian Andrzej Siewior wrote:
> +#ifdef CONFIG_PREEMPT_RT_FULL
> +static inline int dev_recursion_level(void)
> +{
> +	return atomic_read(&current->xmit_recursion);

Why would you need an atomic here. current does hardly race against itself.

Thanks,

	tglx