From: Mike Rapoport <redacted>

It will be used by the upcoming secret memory implementation.

Signed-off-by: Mike Rapoport <redacted>
---
  mm/internal.h | 3 +++
  mm/mmap.c     | 5 ++---
  2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/mm/internal.h b/mm/internal.h
index c43ccdddb0f6..ae146a260b14 100644
--- a/mm/internal.h
+++ b/mm/internal.h

@@ -348,6 +348,9 @@ static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
  extern void mlock_vma_page(struct page *page);
  extern unsigned int munlock_vma_page(struct page *page);
  
+extern int mlock_future_check(struct mm_struct *mm, unsigned long flags,
+			      unsigned long len);
+
  /*
   * Clear the page's PageMlocked().  This can be useful in a situation where
   * we want to unconditionally remove a page from the pagecache -- e.g.,

diff --git a/mm/mmap.c b/mm/mmap.c
index 61f72b09d990..c481f088bd50 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c

@@ -1348,9 +1348,8 @@ static inline unsigned long round_hint_to_min(unsigned long hint)
  	return hint;
  }
  
-static inline int mlock_future_check(struct mm_struct *mm,
-				     unsigned long flags,
-				     unsigned long len)
+int mlock_future_check(struct mm_struct *mm, unsigned long flags,
+		       unsigned long len)
  {
  	unsigned long locked, lock_limit;