linux-kernel - Re: [RFC PATCH] mm/gup: try_pin_compound

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Date:   Tue, 17 Dec 2019 05:56:56 -0800
From:   John Hubbard <jhubbard@...dia.com>
To:     kbuild test robot <lkp@...el.com>
CC:     <kbuild-all@...ts.01.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Alex Williamson <alex.williamson@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Björn Töpel <bjorn.topel@...el.com>,
        Christoph Hellwig <hch@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Dave Chinner <david@...morbit.com>,
        David Airlie <airlied@...ux.ie>,
        "David S . Miller" <davem@...emloft.net>,
        Ira Weiny <ira.weiny@...el.com>, Jan Kara <jack@...e.cz>,
        Jason Gunthorpe <jgg@...pe.ca>, Jens Axboe <axboe@...nel.dk>,
        Jonathan Corbet <corbet@....net>,
        Jérôme Glisse <jglisse@...hat.com>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Michal Hocko <mhocko@...e.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Paul Mackerras <paulus@...ba.org>,
        Shuah Khan <shuah@...nel.org>,
        Vlastimil Babka <vbabka@...e.cz>, <bpf@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>, <kvm@...r.kernel.org>,
        <linux-block@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-fsdevel@...r.kernel.org>, <linux-kselftest@...r.kernel.org>,
        <linux-media@...r.kernel.org>, <linux-rdma@...r.kernel.org>,
        <linuxppc-dev@...ts.ozlabs.org>, <netdev@...r.kernel.org>,
        <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [RFC PATCH] mm/gup: try_pin_compound_head() can be static

On 12/17/19 12:03 AM, kbuild test robot wrote:
> 
> Fixes: 8086d1c61970 ("mm/gup: track FOLL_PIN pages")
> Signed-off-by: kbuild test robot <lkp@...el.com>
> ---
>   gup.c |    2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/gup.c b/mm/gup.c
> index 038b71165a761..849a6f55938e6 100644
> --- a/mm/gup.c
> +++ b/mm/gup.c
> @@ -75,7 +75,7 @@ static inline struct page *try_get_compound_head(struct page *page, int refs)
>    * @Return:	the compound head page, with ref appropriately incremented,
>    * or NULL upon failure.
>    */
> -__must_check struct page *try_pin_compound_head(struct page *page, int refs)
> +static __must_check struct page *try_pin_compound_head(struct page *page, int refs)
>   {
>   	struct page *head = try_get_compound_head(page,
>   						  GUP_PIN_COUNTING_BIAS * refs);
> 

Yes, it should have been declared static. And this also applies to the latest version
(v11). The preferred fix would stay within 80 columns, like this:

diff --git a/mm/gup.c b/mm/gup.c
index c2793a86450e..39b2f683bd2e 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -75,7 +75,8 @@ static inline struct page *try_get_compound_head(struct page *page, int refs)
   * @Return:    the compound head page, with ref appropriately incremented,
   * or NULL upon failure.
   */
-__must_check struct page *try_pin_compound_head(struct page *page, int refs)
+static __must_check struct page *try_pin_compound_head(struct page *page,
+                                                      int refs)
  {
         struct page *head = try_get_compound_head(page,
                                                   GUP_PIN_COUNTING_BIAS * refs);


thanks,
-- 
John Hubbard
NVIDIA