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SubjectRe: [PATCH v5 08/14] memory-hotplug: Common APIs to support page tables hot-remove
On 12/25/2012 04:17 PM, Jianguo Wu wrote:
>> +
>> +static void __meminit free_pagetable(struct page *page, int order)
>> +{
>> + struct zone *zone;
>> + bool bootmem = false;
>> + unsigned long magic;
>> +
>> + /* bootmem page has reserved flag */
>> + if (PageReserved(page)) {
>> + __ClearPageReserved(page);
>> + bootmem = true;
>> +
>> + magic = (unsigned long)page->lru.next;
>> + if (magic == SECTION_INFO || magic == MIX_SECTION_INFO)
>> + put_page_bootmem(page);
>
> Hi Tang,
>
> For removing memmap of sparse-vmemmap, in cpu_has_pse case, if magic == SECTION_INFO,
> the order will be get_order(PMD_SIZE), so we need a loop here to put all the 512 pages.
>
Hi Wu,

Thanks for reminding me that. I truely missed it.

And since in register_page_bootmem_info_section(), a whole memory
section will be set as SECTION_INFO, I think we don't need to check
the page magic one by one, just the first one is enough. :)

I will fix it, thanks. :)



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