netdev - Re: [PATCH v2] mm, page_pool: introduce a new page type for page pool in page type

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Message-ID: <20250729005105.GA56089@system.software.com>
Date: Tue, 29 Jul 2025 09:51:05 +0900
From: Byungchul Park <byungchul@...com>
To: Pavel Begunkov <asml.silence@...il.com>
Cc: linux-mm@...ck.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel_team@...ynix.com,
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Subject: Re: [PATCH v2] mm, page_pool: introduce a new page type for page
 pool in page type

On Mon, Jul 28, 2025 at 07:36:54PM +0100, Pavel Begunkov wrote:
> On 7/28/25 06:27, Byungchul Park wrote:
> > Changes from v1:
> >       1. Rebase on linux-next.
> 
> net-next is closed, looks like until August 11.
> 
> >       2. Initialize net_iov->pp = NULL when allocating net_iov in
> >          net_devmem_bind_dmabuf() and io_zcrx_create_area().
> >       3. Use ->pp for net_iov to identify if it's pp rather than
> >          always consider net_iov as pp.
> >       4. Add Suggested-by: David Hildenbrand <david@...hat.com>.
> 
> Oops, looks you killed my suggested-by tag now. Since it's still
> pretty much my diff spliced with David's suggestions, maybe
> Co-developed-by sounds more appropriate. Even more so goes for
> the second patch getting rid of __netmem_clear_lsb().

Sure.  I will.

	Byungchul

> Looks fine, just one comment below.
> 
> ...> diff --git a/io_uring/zcrx.c b/io_uring/zcrx.c
> > index 100b75ab1e64..34634552cf74 100644
> > --- a/io_uring/zcrx.c
> > +++ b/io_uring/zcrx.c
> > @@ -444,6 +444,7 @@ static int io_zcrx_create_area(struct io_zcrx_ifq *ifq,
> >               area->freelist[i] = i;
> >               atomic_set(&area->user_refs[i], 0);
> >               niov->type = NET_IOV_IOURING;
> > +             niov->pp = NULL;
> 
> It's zero initialised, you don't need it.
> 
> And a friendly reminder, please never send patches modifying a
> subsystem without CC'ing it, especially kept in another tree.
> Sure, you CC'ed me, but it's easy to lose.
> 
> --
> Pavel Begunkov
>