Hi, isimatu-san
At 09/01/2012 05:30 AM, Andrew Morton Wrote:
> On Tue, 28 Aug 2012 18:00:20 +0800
> wency@xxxxxxxxxxxxxx wrote:
>
>> From: Yasuaki Ishimatsu <isimatu.yasuaki@xxxxxxxxxxxxxx>
>>
>> There is a possibility that get_page_bootmem() is called to the same page many
>> times. So when get_page_bootmem is called to the same page, the function only
>> increments page->_count.
>
> I really don't understand this explanation, even after having looked at
> the code. Can you please have another attempt at the changelog?
What is the problem that you want to fix? The function get_page_bootmem()
may be called to the same page more than once, but I don't find any problem
about current implementation.
Thanks
Wen Congyang
>
>> --- a/mm/memory_hotplug.c
>> +++ b/mm/memory_hotplug.c
>> @@ -95,10 +95,17 @@ static void release_memory_resource(struct resource *res)
>> static void get_page_bootmem(unsigned long info, struct page *page,
>> unsigned long type)
>> {
>> - page->lru.next = (struct list_head *) type;
>> - SetPagePrivate(page);
>> - set_page_private(page, info);
>> - atomic_inc(&page->_count);
>> + unsigned long page_type;
>> +
>> + page_type = (unsigned long) page->lru.next;
>> + if (page_type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE ||
>> + page_type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE){
>> + page->lru.next = (struct list_head *) type;
>> + SetPagePrivate(page);
>> + set_page_private(page, info);
>> + atomic_inc(&page->_count);
>> + } else
>> + atomic_inc(&page->_count);
>> }
>
> And a code comment which explains what is going on would be good. As
> is always the case ;)
>
>
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