linux-kernel - Re: [PATCH 07/24] mm/swap: move swap

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Date:   Tue, 21 Nov 2023 15:03:36 +0800
From:   Kairui Song <ryncsn@...il.com>
To:     Chris Li <chrisl@...nel.org>
Cc:     linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        "Huang, Ying" <ying.huang@...el.com>,
        David Hildenbrand <david@...hat.com>,
        Hugh Dickins <hughd@...gle.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Matthew Wilcox <willy@...radead.org>,
        Michal Hocko <mhocko@...e.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 07/24] mm/swap: move swap_count to header to be shared

Chris Li <chrisl@...nel.org> 于2023年11月21日周二 14:52写道：
>
> Hi Kairui,
>
> On Sun, Nov 19, 2023 at 11:48 AM Kairui Song <ryncsn@...il.com> wrote:
> >
> > From: Kairui Song <kasong@...cent.com>
> >
> > No feature change, prepare for later commits.
>
> Again, I don't see the value of having this as a stand alone patch.
> If one of the later patches needs to use this function as external
> rather than static, move it with the patch that uses it. From the
> reviewing point of view, it is unnecessary overhead to cross reference
> different patches in order to figure out why it is moved.

Good suggestion, I do this locally for easier rebase & conflict
resolving, will get rid of these little parts next time.

>
> Chris
>
> >
> > Signed-off-by: Kairui Song <kasong@...cent.com>
> > ---
> >  mm/swap.h     | 5 +++++
> >  mm/swapfile.c | 5 -----
> >  2 files changed, 5 insertions(+), 5 deletions(-)
> >
> > diff --git a/mm/swap.h b/mm/swap.h
> > index f82d43d7b52a..a9a654af791e 100644
> > --- a/mm/swap.h
> > +++ b/mm/swap.h
> > @@ -61,6 +61,11 @@ static inline unsigned int folio_swap_flags(struct folio *folio)
> >  {
> >         return page_swap_info(&folio->page)->flags;
> >  }
> > +
> > +static inline unsigned char swap_count(unsigned char ent)
> > +{
> > +       return ent & ~SWAP_HAS_CACHE; /* may include COUNT_CONTINUED flag */
> > +}
> >  #else /* CONFIG_SWAP */
> >  struct swap_iocb;
> >  static inline void swap_readpage(struct page *page, bool do_poll,
> > diff --git a/mm/swapfile.c b/mm/swapfile.c
> > index 0142bfc71b81..a8ae472ed2b6 100644
> > --- a/mm/swapfile.c
> > +++ b/mm/swapfile.c
> > @@ -114,11 +114,6 @@ static struct swap_info_struct *swap_type_to_swap_info(int type)
> >         return READ_ONCE(swap_info[type]); /* rcu_dereference() */
> >  }
> >
> > -static inline unsigned char swap_count(unsigned char ent)
> > -{
> > -       return ent & ~SWAP_HAS_CACHE;   /* may include COUNT_CONTINUED flag */
> > -}
> > -
> >  /* Reclaim the swap entry anyway if possible */
> >  #define TTRS_ANYWAY            0x1
> >  /*
> > --
> > 2.42.0
> >
> >