linux-kernel - Re: [PATCH v2 net-next 1/4] mm: constify page_is

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Message-ID: <20210129183051.62874a6d@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Fri, 29 Jan 2021 18:30:51 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Alexander Lobakin <alobakin@...me>,
        "David S. Miller" <davem@...emloft.net>,
        David Rientjes <rientjes@...gle.com>,
        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 <brouer@...hat.com>,
        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 v2 net-next 1/4] mm: constify page_is_pfmemalloc()
 argument

On Wed, 27 Jan 2021 20:11:01 +0000 Alexander Lobakin wrote:
> The function only tests for page->index, so its argument should be
> const.
> 
> Signed-off-by: Alexander Lobakin <alobakin@...me>
> ---
>  include/linux/mm.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index ecdf8a8cd6ae..078633d43af9 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -1584,7 +1584,7 @@ struct address_space *page_mapping_file(struct page *page);
>   * ALLOC_NO_WATERMARKS and the low watermark was not
>   * met implying that the system is under some pressure.
>   */
> -static inline bool page_is_pfmemalloc(struct page *page)
> +static inline bool page_is_pfmemalloc(const struct page *page)
>  {
>  	/*
>  	 * Page index cannot be this large so this must be

No objections for this going via net-next?