linux-kernel - [PATCH] lockdep: Include print_collision and helper functions in DEBUG

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Date:	Wed, 13 Apr 2016 17:57:26 -0700
From:	Yang Shi <yang.shi@...aro.org>
To:	peterz@...radead.org, mingo@...hat.com
Cc:	arnd@...db.de, linux-kernel@...r.kernel.org,
	linaro-kernel@...ts.linaro.org, yang.shi@...aro.org
Subject: [PATCH] lockdep: Include print_collision and helper functions in DEBUG_LOCKDEP

pint_collosion and helper functions are just used when DEBUG_LOCKDEP is
selected, so include them in #ifdef CONFIG_DEBUG_LOCKDEP to avoid the below
"defined but not used" warning when DEBUG_LOCKDEP is off:

kernel/locking/lockdep.c:2051:13: warning: 'print_collision' defined but not used [-Wunused-function]
 static void print_collision(struct task_struct *curr,

Signed-off-by: Yang Shi <yang.shi@...aro.org>
---
 kernel/locking/lockdep.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index 2324ba5..ed94109 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -1999,6 +1999,7 @@ static inline int get_first_held_lock(struct task_struct *curr,
 	return ++i;
 }
 
+#ifdef CONFIG_DEBUG_LOCKDEP
 /*
  * Returns the next chain_key iteration
  */
@@ -2069,6 +2070,7 @@ static void print_collision(struct task_struct *curr,
 	printk("\nstack backtrace:\n");
 	dump_stack();
 }
+#endif
 
 /*
  * Checks whether the chain and the current held locks are consistent
-- 
2.0.2