Re: [PATCH] mm: shmem: do not call PageHWPoison on a ERR-page

[Muchun Song <songmuchun@bytedance.com>]

On Thu, Nov 11, 2021 at 7:40 PM Ajay Garg <ajaygargnsit@gmail.com> wrote:
>
> >
> > How about the following changes since the above if block
> > already do the judgment?
> >
> > diff --git a/mm/shmem.c b/mm/shmem.c
> > index f0eee4e221a7..0c84b6624026 100644
> > --- a/mm/shmem.c
> > +++ b/mm/shmem.c
> > @@ -4195,13 +4195,13 @@ struct page *shmem_read_mapping_page_gfp(struct
> > address_space *mapping,
> >          BUG_ON(!shmem_mapping(mapping));
> >          error = shmem_getpage_gfp(inode, index, &page, SGP_CACHE,
> >                                    gfp, NULL, NULL, NULL);
> > -       if (error)
> > +       if (error) {
> >                  page = ERR_PTR(error);
> > -       else
> > +       } else {
> >                  unlock_page(page);
> > -
> > -       if (PageHWPoison(page))
> > -               page = ERR_PTR(-EIO);
> > +               if (PageHWPoison(page))
> > +                       page = ERR_PTR(-EIO);
> > +       }
> >
> >          return page;
>
>
> You have
>
> * simply put braces (not required for 1-liner if/else blocks)
> * contributed nothing to the issue the patch addresses.
>
> I hope this is not a deliberate joke/spam.

What? I put "if (PageHWPoison(page))" into the else branch,
it should be added braces since it's not 1-line blocks. Why do
you think it does not address the issue? What am I missing
here?