linux-kernel - Re: [RFC 2/4] bpf, security: Add Checmate

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Message-ID: <1470299302.13693.13.camel@edumazet-glaptop3.roam.corp.google.com>
Date:	Thu, 04 Aug 2016 10:28:22 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	zhuyj <zyjzyj2000@...il.com>
Cc:	Sargun Dhillon <sargun@...gun.me>,
	LKML <linux-kernel@...r.kernel.org>,
	alexei.starovoitov@...il.com, daniel@...earbox.net,
	linux-security-module@...r.kernel.org,
	netdev <netdev@...r.kernel.org>
Subject: Re: [RFC 2/4] bpf, security: Add Checmate

Please do not top post

On Thu, 2016-08-04 at 16:08 +0800, zhuyj wrote:
>  +void register_checmate_prog_ops(void);
> maybe it is extern void register_checmate_prog_ops(void);?
> 
> +       preempt_disable();
> +       rcu_read_lock();
> IMHO, it is not necessary to use the above 2 since rcu_read_lock will
> call preempt_disable.

You might double check if this claim is true if CONFIG_PREEMPT_RCU=y