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

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Message-ID: <CAHbLzkrzYfQHh=u5574++s4U6hPK2Cax00W2w3nYDGmmL4=M+g@mail.gmail.com>
Date:   Thu, 7 Oct 2021 11:28:36 -0700
From:   Yang Shi <shy828301@...il.com>
To:     Peter Xu <peterx@...hat.com>
Cc:     "Kirill A. Shutemov" <kirill@...temov.name>,
        HORIGUCHI NAOYA(堀口 直也) 
        <naoya.horiguchi@....com>, Hugh Dickins <hughd@...gle.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Matthew Wilcox <willy@...radead.org>,
        Oscar Salvador <osalvador@...e.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux MM <linux-mm@...ck.org>,
        Linux FS-devel Mailing List <linux-fsdevel@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [v3 PATCH 2/5] mm: filemap: check if THP has hwpoisoned subpage
 for PMD page fault

On Thu, Oct 7, 2021 at 9:14 AM Peter Xu <peterx@...hat.com> wrote:
>
> On Wed, Oct 06, 2021 at 04:41:35PM -0700, Yang Shi wrote:
> > > Or maybe we just don't touch it until there's need for a functional change?  I
> > > feel it a pity to lose the git blame info for reindent-only patches, but no
> > > strong opinion, because I know many people don't think the same and I'm fine
> > > with either ways.
> >
> > TBH I really don't think keeping old "git blame" info should be an
> > excuse to avoid any coding style cleanup.
>
> Sure.
>
> >
> > >
> > > Another side note: perhaps a comment above pageflags enum on PG_has_hwpoisoned
> > > would be nice?  I saw that we've got a bunch of those already.
> >
> > I was thinking about that, but it seems PG_double_map doesn't have
> > comment there either so I didn't add.
>
> IMHO that means we may just need even more documentations? :)
>
> I won't ask for documenting doublemap bit in this series, but I just don't
> think it's a good excuse to not provide documentations if we still can.
> Especially to me PageHasHwpoisoned looks really so like PageHwpoisoned, so
> it'll be still very nice to have some good document along with the patch it's
> introduced.

OK, I could add more comments for this flag in the enum. It should be
just a duplicate of the comment right before the PAGEFLAG definition.

>
> Thanks,
>
> --
> Peter Xu
>