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SubjectRe: [PATCH] X86/acpi: remove redundant logic of acpi memory hotadd
On 2012-12-12 22:37, Liu, Jinsong wrote:
> Wen Congyang wrote:
>> At 12/08/2012 06:19 AM, Rafael J. Wysocki Wrote:
>>> On Tuesday, December 04, 2012 01:39:54 AM Liu, Jinsong wrote:
>>>> Resend it, add Rafael and linux-acpi@vger.kernel.org
>>>
>>> I wonder what memory hotplug people think about that.
>>>
>>> Thanks,
>>> Rafael
>>>
>>>
>>>> ===============
>>>> From 1d39279e45c54ce531691da5ffe261e7689dd92c Mon Sep 17 00:00:00
>>>> 2001
>>>> From: Liu Jinsong <jinsong.liu@intel.com>
>>>> Date: Wed, 14 Nov 2012 18:52:06 +0800
>>>> Subject: [PATCH] X86/acpi: remove redundant logic of acpi memory
>>>> hotadd
>>>>
>>>> When memory hotadd, acpi_memory_enable_device has already been done
>>>> at drv->ops.add (acpi_memory_device_add), no need to do it again
>>>> at notify callback.
>>>>
>>>> At acpi_memory_enable_device, acpi_memory_get_device_resources
>>>> is also a redundant action, since it has been done at drv->ops.add.
>>>>
>>>> Signed-off-by: Liu Jinsong <jinsong.liu@intel.com>
>>>> ---
>>>> drivers/acpi/acpi_memhotplug.c | 17 -----------------
>>>> 1 files changed, 0 insertions(+), 17 deletions(-)
>>>>
>>>> diff --git a/drivers/acpi/acpi_memhotplug.c
>>>> b/drivers/acpi/acpi_memhotplug.c
>>>> index 24c807f..a6489fd 100644
>>>> --- a/drivers/acpi/acpi_memhotplug.c
>>>> +++ b/drivers/acpi/acpi_memhotplug.c
>>>> @@ -220,15 +220,6 @@ static int acpi_memory_enable_device(struct
>>>> acpi_memory_device *mem_device) struct acpi_memory_info *info;
>>>> int node;
>>>>
>>>> -
>>>> - /* Get the range from the _CRS */
>>>> - result = acpi_memory_get_device_resources(mem_device);
>>>> - if (result) {
>>>> - printk(KERN_ERR PREFIX "get_device_resources failed\n");
>>>> - mem_device->state = MEMORY_INVALID_STATE;
>>>> - return result;
>>>> - }
>>>> -
>>>> node = acpi_get_node(mem_device->device->handle); /*
>>>> * Tell the VM there is more memory here...
>>>> @@ -357,14 +348,6 @@ static void
>>>> acpi_memory_device_notify(acpi_handle handle, u32 event, void
>>>> *data) break; }
>>>>
>>>> - if (acpi_memory_check_device(mem_device))
>>>> - break;
>>
>> Hmm, if acpi_memory_check_device() fails, it means the memory device
>> disappears
>> I don't know if a real hardware uses this way to remove memory device.
>>
>>>> -
>>>> - if (acpi_memory_enable_device(mem_device)) {
>>>> - printk(KERN_ERR PREFIX "Cannot enable memory device\n");
>>>> - break;
>>>> - }
>>
>> If acpi_memory_get_device() doesn't fail, it means that the device
>> has been managed by this driver, so I think we can do this cleanup.
>>
>> Thanks
>> Wen Congyang
>>
>
> Thanks! any comments from Huawei side, Jiang?
Hi Jinsong,

We think it's ok.

acpi_memory_device_notify
acpi_memory_get_device
acpi_memory_device_add
acpi_memory_get_device_resources
acpi_memory_enable_device
acpi_memory_get_device_resources(redundant)
acpi_memory_check_device(redundant)
acpi_memory_enable_device(redundant)

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