From: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
To: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: wency@cn.fujitsu.com, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, rientjes@google.com,
liuj97@gmail.com, len.brown@intel.com, benh@kernel.crashing.org,
paulus@samba.org, minchan.kim@gmail.com,
akpm@linux-foundation.org
Subject: Re: [PATCH 2/4] memory-hotplug: add node_device_release
Date: Fri, 28 Sep 2012 18:55:22 +0900 [thread overview]
Message-ID: <5065740A.2000502@jp.fujitsu.com> (raw)
In-Reply-To: <CAHGf_=r+oz0GS137e81EySbN-3KVmQisF8sySiCUYUas1RZLtQ@mail.gmail.com>
Hi Kosaki-san,
2012/09/28 10:37, KOSAKI Motohiro wrote:
>>> Moreover, your explanation is still insufficient. Even if
>>> node_device_release() is empty function, we can get rid of the
>>> warning.
>>
>>
>> I don't understand it. How can we get rid of the warning?
>
> See cpu_device_release() for example.
If we implement a function like cpu_device_release(), the warning
disappears. But the comment says in the function "Never copy this way...".
So I think it is illegal way.
>
>
>
>>> Why do we need this node_device_release() implementation?
>>
>> I think that this is a manner of releasing object related kobject.
>
> No. Usually we never call memset() from release callback.
>
What we want to release is a part of array, not a pointer.
Therefore, there is only this way instead of kfree().
Thanks,
Yasuaki Ishimatsu
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WARNING: multiple messages have this Message-ID (diff)
From: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
To: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: <wency@cn.fujitsu.com>, <linux-mm@kvack.org>,
<linux-kernel@vger.kernel.org>, <rientjes@google.com>,
<liuj97@gmail.com>, <len.brown@intel.com>,
<benh@kernel.crashing.org>, <paulus@samba.org>,
<minchan.kim@gmail.com>, <akpm@linux-foundation.org>
Subject: Re: [PATCH 2/4] memory-hotplug: add node_device_release
Date: Fri, 28 Sep 2012 18:55:22 +0900 [thread overview]
Message-ID: <5065740A.2000502@jp.fujitsu.com> (raw)
In-Reply-To: <CAHGf_=r+oz0GS137e81EySbN-3KVmQisF8sySiCUYUas1RZLtQ@mail.gmail.com>
Hi Kosaki-san,
2012/09/28 10:37, KOSAKI Motohiro wrote:
>>> Moreover, your explanation is still insufficient. Even if
>>> node_device_release() is empty function, we can get rid of the
>>> warning.
>>
>>
>> I don't understand it. How can we get rid of the warning?
>
> See cpu_device_release() for example.
If we implement a function like cpu_device_release(), the warning
disappears. But the comment says in the function "Never copy this way...".
So I think it is illegal way.
>
>
>
>>> Why do we need this node_device_release() implementation?
>>
>> I think that this is a manner of releasing object related kobject.
>
> No. Usually we never call memset() from release callback.
>
What we want to release is a part of array, not a pointer.
Therefore, there is only this way instead of kfree().
Thanks,
Yasuaki Ishimatsu
next prev parent reply other threads:[~2012-09-28 9:55 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-27 5:45 [PATCH 0/4] bugfix for memory hotplug wency
2012-09-27 5:45 ` wency
2012-09-27 5:45 ` [PATCH 1/4] memory-hotplug: add memory_block_release wency
2012-09-27 5:45 ` wency
2012-09-27 10:20 ` Ni zhan Chen
2012-09-28 0:24 ` Yasuaki Ishimatsu
2012-09-28 0:24 ` Yasuaki Ishimatsu
2012-09-28 1:35 ` KOSAKI Motohiro
2012-09-28 1:35 ` KOSAKI Motohiro
2012-09-28 3:45 ` Yasuaki Ishimatsu
2012-09-28 3:45 ` Yasuaki Ishimatsu
2012-09-28 6:04 ` Ni zhan Chen
2012-09-28 6:04 ` Ni zhan Chen
2012-09-28 6:11 ` Yasuaki Ishimatsu
2012-09-28 6:11 ` Yasuaki Ishimatsu
2012-09-28 6:14 ` Ni zhan Chen
2012-09-28 6:14 ` Ni zhan Chen
2012-09-28 22:30 ` KOSAKI Motohiro
2012-09-28 22:30 ` KOSAKI Motohiro
2012-09-27 20:11 ` KOSAKI Motohiro
2012-09-27 20:11 ` KOSAKI Motohiro
2012-09-27 5:45 ` [PATCH 2/4] memory-hotplug: add node_device_release wency
2012-09-27 5:45 ` wency
2012-09-27 10:38 ` Ni zhan Chen
2012-09-27 10:38 ` Ni zhan Chen
2012-09-27 20:13 ` KOSAKI Motohiro
2012-09-27 20:13 ` KOSAKI Motohiro
2012-09-28 0:07 ` Yasuaki Ishimatsu
2012-09-28 0:07 ` Yasuaki Ishimatsu
2012-09-28 1:13 ` KOSAKI Motohiro
2012-09-28 1:13 ` KOSAKI Motohiro
2012-09-28 1:30 ` Yasuaki Ishimatsu
2012-09-28 1:30 ` Yasuaki Ishimatsu
2012-09-28 1:37 ` KOSAKI Motohiro
2012-09-28 1:37 ` KOSAKI Motohiro
2012-09-28 9:55 ` Yasuaki Ishimatsu [this message]
2012-09-28 9:55 ` Yasuaki Ishimatsu
2012-09-28 22:19 ` KOSAKI Motohiro
2012-09-28 22:19 ` KOSAKI Motohiro
2012-10-01 6:54 ` Yasuaki Ishimatsu
2012-10-01 6:54 ` Yasuaki Ishimatsu
2012-10-01 18:12 ` KOSAKI Motohiro
2012-10-01 18:12 ` KOSAKI Motohiro
2012-10-05 1:00 ` Yasuaki Ishimatsu
2012-10-05 1:00 ` Yasuaki Ishimatsu
2012-10-05 18:39 ` KOSAKI Motohiro
2012-10-05 18:39 ` KOSAKI Motohiro
2012-09-27 5:45 ` [PATCH 3/4] memory-hotplug: clear hwpoisoned flag when onlining pages wency
2012-09-27 5:45 ` wency
2012-09-27 12:27 ` Ni zhan Chen
2012-09-27 12:27 ` Ni zhan Chen
2012-09-27 20:17 ` KOSAKI Motohiro
2012-09-27 20:17 ` KOSAKI Motohiro
2012-09-28 1:53 ` Wen Congyang
2012-09-28 1:53 ` Wen Congyang
2012-09-27 5:45 ` [PATCH 4/4] memory-hotplug: auto offline page_cgroup when onlining memory block failed wency
2012-09-27 5:45 ` wency
2012-09-27 12:44 ` Ni zhan Chen
2012-09-27 12:44 ` Ni zhan Chen
2012-09-27 20:19 ` KOSAKI Motohiro
2012-09-27 20:19 ` KOSAKI Motohiro
2012-09-27 21:18 ` [PATCH 0/4] bugfix for memory hotplug Andrew Morton
2012-09-27 21:18 ` Andrew Morton
2012-09-29 2:31 ` Ni zhan Chen
2012-09-29 2:31 ` Ni zhan Chen
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