On Tue, 2017-03-28 at 15:23 +0200, Michal Hocko wrote:
> On Tue 28-03-17 15:11:54, Michal Hocko wrote:
> > On Wed 22-03-17 10:09:43, Jiri Slaby wrote:
> > [...]
> > > @@ -1245,6 +1254,10 @@ struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
> > >
> > > page = pmd_page(*pmd);
> > > VM_BUG_ON(!PageHead(page));
> > > +
> > > + if (flags & FOLL_WRITE && !can_follow_write_pmd(*pmd, page, flags))
> > > + goto out;
> > > +
> > > if (flags & FOLL_TOUCH) {
> > > pmd_t _pmd;
> > > /*
> >
> > I have just noticed that this patch is not correct fo 3.12 because we
> > should return NULL rather than the page in this case. 3.2 is wrong as
> > well AFAICS.
>
> The following should be applied on both 3.2 and 3.12 kernels.
[...]
Thanks again; I've queued this up for 3.2.
Ben.
--
Ben Hutchings
To err is human; to really foul things up requires a computer.
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