On Mon, Apr 07, 2014 at 03:40:46PM -0400, Sasha Levin wrote:
> 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().
Okay, I'll try something else.
--
Kirill A. Shutemov
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