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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/