[PATCH] mm/filemap: fix parameters to test_bit()

[Olof Johansson <olof@lixom.net>]

mm/filemap.c: In function 'clear_bit_unlock_is_negative_byte':
mm/filemap.c:933:9: error: too few arguments to function 'test_bit'
  return test_bit(PG_waiters);
         ^~~~~~~~
In file included from arch/arm/include/asm/bitops.h:122:0,
                 from include/linux/bitops.h:36,
                 from include/linux/kernel.h:10,
                 from include/linux/list.h:8,
                 from include/linux/wait.h:6,
                 from include/linux/fs.h:5,
                 from lude/linux/dax.h:4,
                 from mm/filemap.c:14:
include/asm-generic/bitops/non-atomic.h:103:19: note: declared here
 static inline int test_bit(int nr, const volatile unsigned long *addr)
                   ^~~~~~~~
mm/filemap.c:934:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
scripts/Makefile.build:293: recipe for target 'mm/filemap.o' failed

Fixes: b91e1302ad9b ('mm: optimize PageWaiters bit use for unlock_page()')
Signed-off-by: Olof Johansson <olof@lixom.net>
---
 mm/filemap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/filemap.c b/mm/filemap.c
index 6b1d96f..d0e4d10 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -930,7 +930,7 @@ static inline bool clear_bit_unlock_is_negative_byte(long nr, volatile void *mem
 {
 	clear_bit_unlock(nr, mem);
 	/* smp_mb__after_atomic(); */
-	return test_bit(PG_waiters);
+	return test_bit(PG_waiters, mem);
 }
 
 #endif
-- 
2.8.0.rc3.29.gb552ff8