From: Mike Rapoport <redacted>

It will be used by the upcoming secret memory implementation.

Signed-off-by: Mike Rapoport <redacted>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christopher Lameter <redacted>
Cc: Dan Williams <redacted>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Hildenbrand <redacted>
Cc: Elena Reshetova <elena.reshetova@intel.com>
Cc: Hagen Paul Pfeifer <redacted>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Bottomley <redacted>
Cc: "Kirill A. Shutemov" <redacted>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Michael Kerrisk <redacted>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Palmer Dabbelt <redacted>
Cc: Paul Walmsley <redacted>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rick Edgecombe <rick.p.edgecombe@intel.com>
Cc: Roman Gushchin <redacted>
Cc: Shakeel Butt <redacted>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Thomas Gleixner <redacted>
Cc: Tycho Andersen <redacted>
Cc: Will Deacon <will@kernel.org>
---
  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 54bd0dc2c23c..46eb82eaa195 100644
--- a/mm/internal.h
+++ b/mm/internal.h

@@ -373,6 +373,9 @@ 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 0584e540246e..81f5595a8490 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c

@@ -1352,9 +1352,8 @@ 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;