linux-kernel - Re: [PATCH 1/8] sched: coredump.h: clarify the use of MMF_VM

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Date:   Tue, 1 Mar 2022 13:49:19 -0800
From:   Yang Shi <shy828301@...il.com>
To:     Miaohe Lin <linmiaohe@...wei.com>
Cc:     Linux MM <linux-mm@...ck.org>,
        Linux FS-devel Mailing List <linux-fsdevel@...r.kernel.org>,
        linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Song Liu <songliubraving@...com>,
        Rik van Riel <riel@...riel.com>,
        Matthew Wilcox <willy@...radead.org>, Zi Yan <ziy@...dia.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Theodore Ts'o" <tytso@....edu>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        darrick.wong@...cle.com
Subject: Re: [PATCH 1/8] sched: coredump.h: clarify the use of MMF_VM_HUGEPAGE

On Tue, Mar 1, 2022 at 12:45 AM Miaohe Lin <linmiaohe@...wei.com> wrote:
>
> On 2022/3/1 7:57, Yang Shi wrote:
> > MMF_VM_HUGEPAGE is set as long as the mm is available for khugepaged by
> > khugepaged_enter(), not only when VM_HUGEPAGE is set on vma.  Correct
> > the comment to avoid confusion.
> >
> > Signed-off-by: Yang Shi <shy828301@...il.com>
> > ---
> >  include/linux/sched/coredump.h | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/include/linux/sched/coredump.h b/include/linux/sched/coredump.h
> > index 4d9e3a656875..4d0a5be28b70 100644
> > --- a/include/linux/sched/coredump.h
> > +++ b/include/linux/sched/coredump.h
> > @@ -57,7 +57,8 @@ static inline int get_dumpable(struct mm_struct *mm)
> >  #endif
> >                                       /* leave room for more dump flags */
> >  #define MMF_VM_MERGEABLE     16      /* KSM may merge identical pages */
> > -#define MMF_VM_HUGEPAGE              17      /* set when VM_HUGEPAGE is set on vma */
> > +#define MMF_VM_HUGEPAGE              17      /* set when mm is available for
> > +                                        khugepaged */
>
> I think this comment could be written in one line. Anyway, this patch looks good to me.
> Thanks.

Yes, as long as we don't care about the 80 characters limit. I know
the limit was bumped to 100 by checkpatch, but I have seen 80 was
still preferred by a lot of people.

>
> Reviewed-by: Miaohe Lin <linmiaohe@...wei.com>

Thanks.

>
> >  /*
> >   * This one-shot flag is dropped due to necessity of changing exe once again
> >   * on NFS restore
> >
>