linux-kernel - Re: [PATCH net-next 2/3] net: constify page_is

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Date:   Mon, 25 Jan 2021 18:27:33 +0000
From:   Alexander Lobakin <alobakin@...me>
To:     David Rientjes <rientjes@...gle.com>
Cc:     Alexander Lobakin <alobakin@...me>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Yisen Zhuang <yisen.zhuang@...wei.com>,
        Salil Mehta <salil.mehta@...wei.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Leon Romanovsky <leon@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Dexuan Cui <decui@...rosoft.com>,
        Jakub Sitnicki <jakub@...udflare.com>,
        Marco Elver <elver@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, intel-wired-lan@...ts.osuosl.org,
        linux-rdma@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH net-next 2/3] net: constify page_is_pfmemalloc() argument at call sites

From: David Rientjes <rientjes@...gle.com>
Date: Mon, 25 Jan 2021 10:19:48 -0800 (PST)

> On Mon, 25 Jan 2021, Alexander Lobakin wrote:
> 
> > Constify "page" argument for page_is_pfmemalloc() users where applicable.
> >
> > Signed-off-by: Alexander Lobakin <alobakin@...me>
> > ---
> >  drivers/net/ethernet/hisilicon/hns3/hns3_enet.c   | 2 +-
> >  drivers/net/ethernet/intel/fm10k/fm10k_main.c     | 2 +-
> >  drivers/net/ethernet/intel/i40e/i40e_txrx.c       | 2 +-
> >  drivers/net/ethernet/intel/iavf/iavf_txrx.c       | 2 +-
> >  drivers/net/ethernet/intel/ice/ice_txrx.c         | 2 +-
> >  drivers/net/ethernet/intel/igb/igb_main.c         | 2 +-
> >  drivers/net/ethernet/intel/igc/igc_main.c         | 2 +-
> >  drivers/net/ethernet/intel/ixgbe/ixgbe_main.c     | 2 +-
> >  drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c | 2 +-
> >  drivers/net/ethernet/mellanox/mlx5/core/en_rx.c   | 2 +-
> >  include/linux/skbuff.h                            | 4 ++--
> >  11 files changed, 12 insertions(+), 12 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
> > index 512080640cbc..0f8e962b5010 100644
> > --- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
> > +++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
> > @@ -2800,7 +2800,7 @@ static void hns3_nic_alloc_rx_buffers(struct hns3_enet_ring *ring,
> >  	writel(i, ring->tqp->io_base + HNS3_RING_RX_RING_HEAD_REG);
> >  }
> >
> > -static bool hns3_page_is_reusable(struct page *page)
> > +static bool hns3_page_is_reusable(const struct page *page)
> >  {
> >  	return page_to_nid(page) == numa_mem_id() &&
> >  		!page_is_pfmemalloc(page);
> 
> Hi Alexander,

Hi David!

> All of these functions appear to be doing the same thing, would it make
> sense to simply add this to a header file and remove all the code
> duplication as well?

That's an interesting idea. I'll be glad to do this if drivers'
maintainers agree it's okay for them.

Thanks,
Al