From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: Wen Congyang <wency@cn.fujitsu.com>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>,
x86@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org,
linux-acpi@vger.kernel.org, rientjes@google.com,
liuj97@gmail.com, len.brown@intel.com, cl@linux.com,
minchan.kim@gmail.com, akpm@linux-foundation.org
Subject: Re: [PATCH 1/4] acpi,memory-hotplug : add memory offline code to acpi_memory_device_remove()
Date: Mon, 22 Oct 2012 11:34:49 -0400 [thread overview]
Message-ID: <CAHGf_=qK=mAAwor7iXxDtwTtW2Qhui_8GmtHGreMuFuQVGWAvQ@mail.gmail.com> (raw)
In-Reply-To: <CAHGf_=rYgA=yAjcvziGbN0k48zTZn8+5XQJxoMwZ4wvrX6x4sA@mail.gmail.com>
On Mon, Oct 22, 2012 at 11:11 AM, KOSAKI Motohiro
<kosaki.motohiro@jp.fujitsu.com> wrote:
>>> ??
>>> If resource was not allocated a driver, a driver doesn't need to
>>> deallocate it when
>>> error path. I haven't caught your point.
>>>
>>
>> REMOVAL_NORMAL can be in 2 cases:
>> 1. error path. If init call fails, we don't call it. We call this function
>> only when something fails after init.
>> 2. unbind the device from the driver.
>> If we don't offline and remove memory when unbinding the device from the driver,
>> the device may be out of control. When we eject this driver, we don't offline and
>
> Memory never be out of control by driver unloading. It is controled
> from kernel core. It is an exception from regular linux driver model.
Ah, got it.
acpi_bus_hot_remove_device() evaluate PS3 before EJ0. Then
your first patch may cause memory lost.
WARNING: multiple messages have this Message-ID (diff)
From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: Wen Congyang <wency@cn.fujitsu.com>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>,
x86@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org,
linux-acpi@vger.kernel.org, rientjes@google.com,
liuj97@gmail.com, len.brown@intel.com, cl@linux.com,
minchan.kim@gmail.com, akpm@linux-foundation.org
Subject: Re: [PATCH 1/4] acpi,memory-hotplug : add memory offline code to acpi_memory_device_remove()
Date: Mon, 22 Oct 2012 11:34:49 -0400 [thread overview]
Message-ID: <CAHGf_=qK=mAAwor7iXxDtwTtW2Qhui_8GmtHGreMuFuQVGWAvQ@mail.gmail.com> (raw)
In-Reply-To: <CAHGf_=rYgA=yAjcvziGbN0k48zTZn8+5XQJxoMwZ4wvrX6x4sA@mail.gmail.com>
On Mon, Oct 22, 2012 at 11:11 AM, KOSAKI Motohiro
<kosaki.motohiro@jp.fujitsu.com> wrote:
>>> ??
>>> If resource was not allocated a driver, a driver doesn't need to
>>> deallocate it when
>>> error path. I haven't caught your point.
>>>
>>
>> REMOVAL_NORMAL can be in 2 cases:
>> 1. error path. If init call fails, we don't call it. We call this function
>> only when something fails after init.
>> 2. unbind the device from the driver.
>> If we don't offline and remove memory when unbinding the device from the driver,
>> the device may be out of control. When we eject this driver, we don't offline and
>
> Memory never be out of control by driver unloading. It is controled
> from kernel core. It is an exception from regular linux driver model.
Ah, got it.
acpi_bus_hot_remove_device() evaluate PS3 before EJ0. Then
your first patch may cause memory lost.
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next prev parent reply other threads:[~2012-10-22 15:34 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-03 9:52 [PATCH 0/4] acpi,memory-hotplug : implement framework for hot removing memory Yasuaki Ishimatsu
2012-10-03 9:52 ` Yasuaki Ishimatsu
2012-10-03 9:52 ` Yasuaki Ishimatsu
2012-10-03 9:58 ` [PATCH 1/4] acpi,memory-hotplug : add memory offline code to acpi_memory_device_remove() Yasuaki Ishimatsu
2012-10-03 9:58 ` Yasuaki Ishimatsu
2012-10-04 20:53 ` KOSAKI Motohiro
2012-10-04 20:53 ` KOSAKI Motohiro
2012-10-08 6:58 ` Wen Congyang
2012-10-08 6:58 ` Wen Congyang
2012-10-12 19:10 ` KOSAKI Motohiro
2012-10-12 19:10 ` KOSAKI Motohiro
2012-10-17 6:48 ` Wen Congyang
2012-10-17 6:48 ` Wen Congyang
2012-10-17 8:59 ` KOSAKI Motohiro
2012-10-17 8:59 ` KOSAKI Motohiro
2012-10-17 9:08 ` Wen Congyang
2012-10-17 9:08 ` Wen Congyang
2012-10-17 9:18 ` KOSAKI Motohiro
2012-10-17 9:18 ` KOSAKI Motohiro
2012-10-17 9:52 ` Wen Congyang
2012-10-17 9:52 ` Wen Congyang
2012-10-18 1:25 ` Yasuaki Ishimatsu
2012-10-18 1:25 ` Yasuaki Ishimatsu
2012-10-18 1:25 ` Yasuaki Ishimatsu
2012-10-19 7:35 ` Wen Congyang
2012-10-19 7:35 ` Wen Congyang
2012-10-17 9:18 ` Wen Congyang
2012-10-17 9:18 ` Wen Congyang
2012-10-18 19:44 ` KOSAKI Motohiro
2012-10-18 19:44 ` KOSAKI Motohiro
2012-10-19 9:08 ` Wen Congyang
2012-10-19 9:08 ` Wen Congyang
2012-10-19 18:19 ` KOSAKI Motohiro
2012-10-19 18:19 ` KOSAKI Motohiro
2012-10-20 5:02 ` Wen Congyang
2012-10-20 5:02 ` Wen Congyang
2012-10-22 15:11 ` KOSAKI Motohiro
2012-10-22 15:11 ` KOSAKI Motohiro
2012-10-22 15:34 ` KOSAKI Motohiro [this message]
2012-10-22 15:34 ` KOSAKI Motohiro
2012-10-03 10:02 ` [PATCH 2/4] acpi,memory-hotplug : rename remove_memory() to offline_memory() Yasuaki Ishimatsu
2012-10-03 10:02 ` Yasuaki Ishimatsu
2012-10-04 21:31 ` KOSAKI Motohiro
2012-10-04 21:31 ` KOSAKI Motohiro
2012-10-08 6:45 ` Wen Congyang
2012-10-08 6:45 ` Wen Congyang
2012-10-12 18:57 ` KOSAKI Motohiro
2012-10-12 18:57 ` KOSAKI Motohiro
2012-10-03 10:09 ` [PATCH 3/6] acpi,memory-hotplug : add physical memory hotplug code to acpi_memhotplug.c Yasuaki Ishimatsu
2012-10-03 10:09 ` Yasuaki Ishimatsu
2012-10-05 18:54 ` KOSAKI Motohiro
2012-10-05 18:54 ` KOSAKI Motohiro
2012-10-03 10:11 ` [PATCH 4/4] acpi,memory-hotplug : store the node id in acpi_memory_device Yasuaki Ishimatsu
2012-10-03 10:11 ` Yasuaki Ishimatsu
2012-10-03 10:11 ` Yasuaki Ishimatsu
2012-10-05 18:56 ` KOSAKI Motohiro
2012-10-05 18:56 ` KOSAKI Motohiro
2012-10-08 6:47 ` Wen Congyang
2012-10-08 6:47 ` Wen Congyang
2012-10-12 18:59 ` KOSAKI Motohiro
2012-10-12 18:59 ` KOSAKI Motohiro
2012-10-06 14:22 ` [PATCH 0/4] acpi,memory-hotplug : implement framework for hot removing memory Ni zhan Chen
2012-10-06 14:22 ` Ni zhan Chen
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