kernel/futex.c: make 3 functions static

The following functions can now become static again:
- get_futex_key()
- get_futex_key_refs()
- drop_futex_key_refs()

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

include/linux/futex.h

@@ -149,10 +149,6 @@ union futex_key {
 		int offset;
 	} both;
 };
-int get_futex_key(u32 __user *uaddr, struct rw_semaphore *shared,
-		  union futex_key *key);
-void get_futex_key_refs(union futex_key *key);
-void drop_futex_key_refs(union futex_key *key);
 
 #ifdef CONFIG_FUTEX
 extern void exit_robust_list(struct task_struct *curr);

kernel/futex.c

@@ -181,8 +181,8 @@ static inline int match_futex(union futex_key *key1, union futex_key *key2)
  * For other futexes, it points to &current->mm->mmap_sem and
  * caller must have taken the reader lock. but NOT any spinlocks.
  */
-int get_futex_key(u32 __user *uaddr, struct rw_semaphore *fshared,
-		  union futex_key *key)
+static int get_futex_key(u32 __user *uaddr, struct rw_semaphore *fshared,
+			 union futex_key *key)
 {
 	unsigned long address = (unsigned long)uaddr;
 	struct mm_struct *mm = current->mm;
@@ -268,14 +268,13 @@ int get_futex_key(u32 __user *uaddr, struct rw_semaphore *fshared,
 	}
 	return err;
 }
-EXPORT_SYMBOL_GPL(get_futex_key);
 
 /*
  * Take a reference to the resource addressed by a key.
  * Can be called while holding spinlocks.
  *
  */
-inline void get_futex_key_refs(union futex_key *key)
+static void get_futex_key_refs(union futex_key *key)
 {
 	if (key->both.ptr == 0)
 		return;
@@ -288,13 +287,12 @@ inline void get_futex_key_refs(union futex_key *key)
 			break;
 	}
 }
-EXPORT_SYMBOL_GPL(get_futex_key_refs);
 
 /*
  * Drop a reference to the resource addressed by a key.
  * The hash bucket spinlock must not be held.
  */
-void drop_futex_key_refs(union futex_key *key)
+static void drop_futex_key_refs(union futex_key *key)
 {
 	if (!key->both.ptr)
 		return;
@@ -307,7 +305,6 @@ void drop_futex_key_refs(union futex_key *key)
 			break;
 	}
 }
-EXPORT_SYMBOL_GPL(drop_futex_key_refs);
 
 static u32 cmpxchg_futex_value_locked(u32 __user *uaddr, u32 uval, u32 newval)
 {