[PATCH aa] userfaultfd: double_down_read() can be static

[kbuild test robot <fengguang.wu@intel.com>]

mm/userfaultfd.c:48:6: sparse: symbol 'double_down_read' was not declared. Should it be static?
mm/userfaultfd.c:67:6: sparse: symbol 'double_up_read' was not declared. Should it be static?

Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
---
 userfaultfd.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c
index d1e89ef..88b2650 100644
--- a/mm/userfaultfd.c
+++ b/mm/userfaultfd.c
@@ -45,7 +45,7 @@ void double_pt_unlock(spinlock_t *ptl1,
 		spin_unlock(ptl2);
 }
 
-void double_down_read(struct rw_semaphore *mm1,
+static void double_down_read(struct rw_semaphore *mm1,
 		      struct rw_semaphore *mm2)
 	__acquires(mm1)
 	__acquires(mm2)
@@ -64,7 +64,7 @@ void double_down_read(struct rw_semaphore *mm1,
 		down_read_nested(mm2, SINGLE_DEPTH_NESTING);
 }
 
-void double_up_read(struct rw_semaphore *mm1,
+static void double_up_read(struct rw_semaphore *mm1,
 		    struct rw_semaphore *mm2)
 	__releases(mm1)
 	__releases(mm2)

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