[PATCH v1 1/1] lockdep: Mark chain_hlock_class_idx() with __maybe_unused

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

When chain_hlock_class_idx() is unused, it prevents kernel builds with clang,
`make W=1` and CONFIG_WERROR=y:

kernel/locking/lockdep.c:435:28: error: unused function 'chain_hlock_class_idx' [-Werror,-Wunused-function]

Fix this by marking it with __maybe_unused.

See also commit 6863f5643dd7 ("kbuild: allow Clang to find unused static
inline functions for W=1 build").

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 kernel/locking/lockdep.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index bb65abfcfa71..29acd238dad7 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -432,7 +432,7 @@ static inline u16 hlock_id(struct held_lock *hlock)
 	return (hlock->class_idx | (hlock->read << MAX_LOCKDEP_KEYS_BITS));
 }
 
-static inline unsigned int chain_hlock_class_idx(u16 hlock_id)
+static inline __maybe_unused unsigned int chain_hlock_class_idx(u16 hlock_id)
 {
 	return hlock_id & (MAX_LOCKDEP_KEYS - 1);
 }
-- 
2.43.0.rc1.1336.g36b5255a03ac