Re: [PATCH v2 1/4] mm/memory-hotplug: fix lowmem count overflow when offline pages

[Wanpeng Li <liwanp@linux.vnet.ibm.com>]

Hi KOSAKI,
On Sat, May 25, 2013 at 09:16:24PM -0400, KOSAKI Motohiro wrote:
>> ---
>>  mm/page_alloc.c | 2 ++
>>  1 file changed, 2 insertions(+)
>> 
>> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
>> index 98cbdf6..23b921f 100644
>> --- a/mm/page_alloc.c
>> +++ b/mm/page_alloc.c
>> @@ -6140,6 +6140,8 @@ __offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn)
>>  		list_del(&page->lru);
>>  		rmv_page_order(page);
>>  		zone->free_area[order].nr_free--;
>> +		if (PageHighMem(page))
>> +			totalhigh_pages -= 1 << order;
>>  		for (i = 0; i < (1 << order); i++)
>>  			SetPageReserved((page+i));
>>  		pfn += (1 << order);
>
>memory hotplug don't support 32bit since it was born, at least, when the system has highmem. 
>Why can't we disable memory hotremove when 32bit at compile time?

Here is logic memory remove instead of ACPI based memory remove. ;-)

Regards,
Wanpeng Li 

>

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