Make set_recommended_min_free_kbytes() callable from outside
khugepaged.c by removing the static qualifier and adding a
declaration in mm/internal.h.

This allows callers that change THP settings to recalculate
watermarks without going through start_stop_khugepaged().

Suggested-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org>
Reviewed-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Signed-off-by: Breno Leitao <leitao@debian.org>
---
 mm/internal.h   | 5 +++++
 mm/khugepaged.c | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/mm/internal.h b/mm/internal.h
index cb0af847d7d99..7bd768e367793 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -623,6 +623,11 @@ int user_proactive_reclaim(char *buf,
  */
 pmd_t *mm_find_pmd(struct mm_struct *mm, unsigned long address);
 
+/*
+ * in mm/khugepaged.c
+ */
+void set_recommended_min_free_kbytes(void);
+
 /*
  * in mm/page_alloc.c
  */
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 1dd3cfca610db..56a41c21b44c9 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -2630,7 +2630,7 @@ static int khugepaged(void *none)
 	return 0;
 }
 
-static void set_recommended_min_free_kbytes(void)
+void set_recommended_min_free_kbytes(void)
 {
 	struct zone *zone;
 	int nr_zones = 0;

-- 
2.52.0