netdev - Re: [patch net-next 1/4] net: Introduce psample, a new genetlink channel for packet sampling

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Date:   Mon, 23 Jan 2017 15:57:50 -0800
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, yotamg@...lanox.com,
        idosch@...lanox.com, eladr@...lanox.com, nogahf@...lanox.com,
        ogerlitz@...lanox.com, jhs@...atatu.com, geert+renesas@...der.be,
        xiyou.wangcong@...il.com, linux@...ck-us.net,
        roopa@...ulusnetworks.com, john.fastabend@...il.com,
        simon.horman@...ronome.com, mrv@...atatu.com
Subject: Re: [patch net-next 1/4] net: Introduce psample, a new genetlink
 channel for packet sampling

On Sun, 22 Jan 2017 12:44:44 +0100
Jiri Pirko <jiri@...nulli.us> wrote:

> +static LIST_HEAD(psample_groups_list);
> +static DEFINE_SPINLOCK(psample_groups_lock);
> +

Why not a mutex? You aren't acquiring this in IRQ context?