> + * If pmd isn't transhuge but the page is THP and
> + * is owned by only this process, split it and
> + * deactivate all pages.
> + */
> + if (PageTransCompound(page)) {
> + if (page_mapcount(page) != 1)
> + goto out;
> + get_page(page);
> + if (!trylock_page(page)) {
> + put_page(page);
> + goto out;
> + }
> + pte_unmap_unlock(orig_pte, ptl);
> + if (split_huge_page(page)) {
> + unlock_page(page);
> + put_page(page);
> + pte_offset_map_lock(mm, pmd, addr, &ptl);
> + goto out;
> + }
> + pte = pte_offset_map_lock(mm, pmd, addr, &ptl);
> + pte--;
> + addr -= PAGE_SIZE;
> + continue;
> + }
looks like this leaks page count if split_huge_page() is succesfull
(returns zero).
--Mika
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