On Fri, Mar 24, 2017 at 11:09:25AM -0500, Zi Yan wrote:
> Kirill A. Shutemov wrote:
> > On Mon, Mar 13, 2017 at 11:45:02AM -0400, Zi Yan wrote:
> > Again. That's doesn't look right..
>
> It will be changed:
>
> ptl = pmd_lock(mm, pmd);
> +retry_locked:
> + if (unlikely(!pmd_present(*pmd))) {
> + if (likely(!(flags & FOLL_MIGRATION))) {
> + spin_unlock(ptl);
> + return no_page_table(vma, flags);
> + }
> + pmd_migration_entry_wait(mm, pmd);
> + goto retry_locked;
Nope. pmd_migration_entry_wait() unlocks the ptl.
--
Kirill A. Shutemov
