Re: [v3 PATCH 2/5] mm: filemap: check if THP has hwpoisoned subpage for PMD page fault

From: Yang Shi
Date: Mon Oct 04 2021 - 16:13:23 EST


On Mon, Oct 4, 2021 at 12:41 PM Kirill A. Shutemov <kirill@xxxxxxxxxxxxx> wrote:
>
> On Mon, Oct 04, 2021 at 11:17:29AM -0700, Yang Shi wrote:
> > On Mon, Oct 4, 2021 at 7:06 AM Kirill A. Shutemov <kirill@xxxxxxxxxxxxx> wrote:
> > >
> > > On Thu, Sep 30, 2021 at 02:53:08PM -0700, Yang Shi wrote:
> > > > diff --git a/mm/filemap.c b/mm/filemap.c
> > > > index dae481293b5d..2acc2b977f66 100644
> > > > --- a/mm/filemap.c
> > > > +++ b/mm/filemap.c
> > > > @@ -3195,12 +3195,12 @@ static bool filemap_map_pmd(struct vm_fault *vmf, struct page *page)
> > > > }
> > > >
> > > > if (pmd_none(*vmf->pmd) && PageTransHuge(page)) {
> > > > - vm_fault_t ret = do_set_pmd(vmf, page);
> > > > - if (!ret) {
> > > > - /* The page is mapped successfully, reference consumed. */
> > > > - unlock_page(page);
> > > > - return true;
> > > > - }
> > > > + vm_fault_t ret = do_set_pmd(vmf, page);
> > > > + if (!ret) {
> > > > + /* The page is mapped successfully, reference consumed. */
> > > > + unlock_page(page);
> > > > + return true;
> > > > + }
> > > > }
> > > >
> > > > if (pmd_none(*vmf->pmd)) {
> > >
> > > Hm. Is it unrelated whitespace fix?
> >
> > It is a coding style clean up. I thought it may be overkilling to have
> > a separate patch. Do you prefer separate one?
>
> Maybe. I tried to find what changed here. It's confusing.

Yeah, maybe. Anyway I will separate the real big fix and the cleanup
into two patches. This may be helpful for backporting too.

>
> --
> Kirill A. Shutemov