linux-kernel - Re: [PATCH] cgroup: net_cls: fix false-positive "suspicious RCU usage"

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Date:	Tue, 21 Jul 2015 22:28:58 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	khlebnikov@...dex-team.ru
Cc:	netdev@...r.kernel.org, tj@...nel.org, cgroups@...r.kernel.org,
	lizefan@...wei.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cgroup: net_cls: fix false-positive "suspicious RCU
 usage"

From: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
Date: Tue, 21 Jul 2015 19:46:29 +0300

> @@ -23,7 +23,8 @@ static inline struct cgroup_cls_state *css_cls_state(struct cgroup_subsys_state
>  
>  struct cgroup_cls_state *task_cls_state(struct task_struct *p)
>  {
> -	return css_cls_state(task_css(p, net_cls_cgrp_id));
> +       return css_cls_state(task_css_check(p, net_cls_cgrp_id,
> +			       rcu_read_lock_bh_held()));

You've made a serious mess of the indentation here.

First of all, you've changed the correct plain "TAB" before the 'return' line
into a TAB and two SPACE characters.

Secondly, the second line needs to be precisely indented to the exact column
following the openning parenthesis of the task_css_check() call on the
previous line.
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