1 files changed, 7 insertions, 1 deletions

diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h
index 3f2867ff0ced..262ba4ef9a8e 100644
--- a/include/linux/spinlock.h
+++ b/include/linux/spinlock.h
@@ -197,7 +197,13 @@ static inline void do_raw_spin_unlock(raw_spinlock_t *lock) __releases(lock)
                  _raw_spin_lock_nest_lock(lock, &(nest_lock)->dep_map); \
          } while (0)
 #else
-# define raw_spin_lock_nested(lock, subclass)           _raw_spin_lock(lock)
+/*
+ * Always evaluate the 'subclass' argument to avoid that the compiler
+ * warns about set-but-not-used variables when building with
+ * CONFIG_DEBUG_LOCK_ALLOC=n and with W=1.
+ */
+# define raw_spin_lock_nested(lock, subclass)           \
+        _raw_spin_lock(((void)(subclass), (lock)))
 # define raw_spin_lock_nest_lock(lock, nest_lock)       _raw_spin_lock(lock)
 #endif