[PATCH 2.25] powerpc: Fix adapt_count update in __lll_unlock_elision

[Tulio Magno Quites Machado Filho]

Thanks for catching this.

--- 8< ---

Commit e9a96ea1aca4ebaa7c86e8b83b766f118d689d0f had an error that
prevents adapt_count from being updated in __lll_unlock_elision.

2017-01-16  Tulio Magno Quites Machado Filho  <tuliom@linux.vnet.ibm.com>

	* sysdeps/unix/sysv/linux/powerpc/elision-unlock.c
	(__lll_unlock_elision): Fix adapt_count decrement.
---
 sysdeps/unix/sysv/linux/powerpc/elision-unlock.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sysdeps/unix/sysv/linux/powerpc/elision-unlock.c b/sysdeps/unix/sysv/linux/powerpc/elision-unlock.c
index 759c146..e3fe58e 100644
--- a/sysdeps/unix/sysv/linux/powerpc/elision-unlock.c
+++ b/sysdeps/unix/sysv/linux/powerpc/elision-unlock.c
@@ -35,7 +35,7 @@ __lll_unlock_elision (int *lock, short *adapt_count, int pshared)
 	 the mutex destruction requirements.  */
       short __tmp = atomic_load_relaxed (adapt_count);
       if (__tmp > 0)
-	atomic_store_relaxed (adapt_count, __tmp--);
+	atomic_store_relaxed (adapt_count, __tmp - 1);
 
       lll_unlock ((*lock), pshared);
     }
-- 
2.1.0