linux-kernel - Re: [RT PATCH 2/2] net: add a lock around icmp

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Message-ID: <1472735460.5019.21.camel@edumazet-glaptop3.roam.corp.google.com>
Date:   Thu, 01 Sep 2016 06:11:00 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        tglx@...utronix.de, Steven Rostedt <rostedt@...dmis.org>,
        netdev@...r.kernel.org
Subject: Re: [RT PATCH 2/2] net: add a lock around icmp_sk()

On Thu, 2016-09-01 at 10:11 +0200, Sebastian Andrzej Siewior wrote:

> On !RT local_lock() is preempt_disable().
> On RT local_lock() is a per-CPU sleeping spinlock which can be taken
> recursively by the owner.

Ok, thanks for the explanation, the 'recursively' part I was not aware
of ;)