linux-kernel - Re: [PATCH v9 0/9] Request for inclusion: per-cgroup tcp memory pressure controls

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Message-ID: <4EE7B154.4050208@parallels.com>
Date:	Wed, 14 Dec 2011 00:11:00 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	<christoph.paasch@...ouvain.be>,
	David Miller <davem@...emloft.net>,
	<linux-kernel@...r.kernel.org>, <paul@...lmenage.org>,
	<lizf@...fujitsu.com>, <kamezawa.hiroyu@...fujitsu.com>,
	<ebiederm@...ssion.com>, <gthelen@...gle.com>,
	<netdev@...r.kernel.org>, <linux-mm@...ck.org>,
	<kirill@...temov.name>, <avagin@...allels.com>, <devel@...nvz.org>,
	<cgroups@...r.kernel.org>
Subject: Re: [PATCH v9 0/9] Request for inclusion: per-cgroup tcp memory pressure
 controls

On 12/13/2011 05:59 PM, Eric Dumazet wrote:
> Le mardi 13 décembre 2011 à 14:49 +0100, Christoph Paasch a écrit :
>
>> now there are plenty of compiler-warnings when CONFIG_CGROUPS is not set:
>>
>> In file included from include/linux/tcp.h:211:0,
>>                   from include/linux/ipv6.h:221,
>>                   from include/net/ip_vs.h:23,
>>                   from kernel/sysctl_binary.c:6:
>> include/net/sock.h:67:57: warning: ‘struct cgroup_subsys’ declared
>> inside parameter list [enabled by default]
>> include/net/sock.h:67:57: warning: its scope is only this definition or
>> declaration, which is probably not what you want [enabled by default]
>> include/net/sock.h:67:57: warning: ‘struct cgroup’ declared inside
>> parameter list [enabled by default]
>> include/net/sock.h:68:61: warning: ‘struct cgroup_subsys’ declared
>> inside parameter list [enabled by default]
>> include/net/sock.h:68:61: warning: ‘struct cgroup’ declared inside
>> parameter list [enabled by default]
>>
>>
>> Because struct cgroup is only declared if CONFIG_CGROUPS is enabled.
>> (cfr. linux/cgroup.h)
>>
>
> Yes, we probably need forward reference like this :
>
> Thanks !
>
> [PATCH net-next] net: fix build error if CONFIG_CGROUPS=n
>
> Reported-by: Christoph Paasch<christoph.paasch@...ouvain.be>
> Signed-off-by: Eric Dumazet<eric.dumazet@...il.com>
I am deeply sorry about that.
I was pretty sure I tested this case. But now that I looked into it, it 
occurs to me that I may have tested it only with the Memory Cgroup 
disabled, not with the master flag off.

Thanks for spotting this

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