[PATCH printk v3 01/40] rcu: implement lockdep_rcu_enabled for !CONFIG_DEBUG_LOCK_ALLOC

[John Ogness <john.ogness@linutronix.de>]

Provide an implementation for debug_lockdep_rcu_enabled() when
CONFIG_DEBUG_LOCK_ALLOC is not enabled. This allows code to check
if rcu lockdep debugging is available without needing an extra
check if CONFIG_DEBUG_LOCK_ALLOC is enabled.

Signed-off-by: John Ogness <john.ogness@linutronix.de>
---
 I also sent this patch to Paul as a suggestion. If it is not
 acceptable, I just need to add an ifdef CONFIG_DEBUG_LOCK_ALLOC
 into console_list_lock() of patch 21.

 include/linux/rcupdate.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index 08605ce7379d..65178c40ab6f 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -340,6 +340,11 @@ static inline int rcu_read_lock_any_held(void)
 	return !preemptible();
 }
 
+static inline int debug_lockdep_rcu_enabled(void)
+{
+	return 0;
+}
+
 #endif /* #else #ifdef CONFIG_DEBUG_LOCK_ALLOC */
 
 #ifdef CONFIG_PROVE_RCU
-- 
2.30.2