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

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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@xxxxxxxxx>
---
  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



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