linux-kernel - Re: Linux 2.6.37-rc1 (net/sched: cls

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Message-ID: <4CD2105F.6090900@gmail.com>
Date:	Thu, 04 Nov 2010 09:46:07 +0800
From:	Li Zefan <lizf.kern@...il.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
CC:	Eric Dumazet <eric.dumazet@...il.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jamal Hadi Salim <hadi@...erus.ca>,
	Thomas Graf <tgraf@...g.ch>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>, Ben Blum <bblum@...rew.cmu.edu>
Subject: Re: Linux 2.6.37-rc1 (net/sched: cls_cgroup)

>> commits 8e039d84b323c450 
>> (cgroups: net_cls as module)
>>
>> followed by commit f845172531f
>> (cls_cgroup: Store classid in struct sock)
> 
> Indeed, it looks like the tree I worked on didn't have the first
> patch applied for some reason.
> 

The first patch was merged in .34, and the second one .35, and
from the changelog and the diff, seems you did know cls_cgroup
can be a module. ;)

> Anyway, this patch should fix the problem.  Thanks Eric!
> 
> cls_cgroup: Fix crash on module unload
> 
> Somewhere along the lines net_cls_subsys_id became a macro when
> cls_cgroup is built as a module.  Not only did it make cls_cgroup
> completely useless, it also causes it to crash on module unload.
> 
> This patch fixes this by removing that macro.
> 
> Thanks to Eric Dumazet for diagnosing this problem.
> 
> Reported-by: Randy Dunlap <randy.dunlap@...cle.com>
> Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
> 

Reviewed-by: Li Zefan <lizf@...fujitsu.com>

> diff --git a/net/sched/cls_cgroup.c b/net/sched/cls_cgroup.c
> index 37dff78..d49c40f 100644
> --- a/net/sched/cls_cgroup.c
> +++ b/net/sched/cls_cgroup.c
> @@ -34,8 +34,6 @@ struct cgroup_subsys net_cls_subsys = {
>  	.populate	= cgrp_populate,
>  #ifdef CONFIG_NET_CLS_CGROUP
>  	.subsys_id	= net_cls_subsys_id,
> -#else
> -#define net_cls_subsys_id net_cls_subsys.subsys_id
>  #endif
>  	.module		= THIS_MODULE,
>  };
> 
> Cheers,
--
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