It also breaks fairly quickly under testing because:
On 04/07/2014 10:48 AM, Kirill A. Shutemov wrote:
> + if (IS_ENABLED(CONFIG_DEBUG_PAGEALLOC)) {
> + spin_lock(ptl);
^ We go into atomic
> + if (unlikely(!pmd_same(*pmd, orig_pmd)))
> + goto out_race;
> + }
> +
> if (!page)
> clear_huge_page(new_page, haddr, HPAGE_PMD_NR);
> else
> copy_user_huge_page(new_page, page, haddr, vma, HPAGE_PMD_NR);
copy_user_huge_page() doesn't like running in atomic state,
and asserts might_sleep().
Thanks,
Sasha
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