Re: mm: BUG in do_huge_pmd_wp_page

[Kirill A. Shutemov]

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