Re: [RFC PATCH] mm/gup: try_pin_compound_head() can be static

[John Hubbard <jhubbard@nvidia.com>]

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@intel.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