linux-kernel - [patch V2 09/15] locking/rtmutex: Decrapify __rt_mutex

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Message-Id: <20210326153943.955697588@linutronix.de>
Date:   Fri, 26 Mar 2021 16:29:38 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>, Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [patch V2 09/15] locking/rtmutex: Decrapify __rt_mutex_init()

The conditional debug handling is just another layer of obfuscation. Split
the function so rt_mutex_init_proxy_locked() can invoke the inner init and
__rt_mutex_init() gets the full treatment.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 kernel/locking/rtmutex.c        |   10 ++++------
 kernel/locking/rtmutex_common.h |    7 +++++++
 2 files changed, 11 insertions(+), 6 deletions(-)

--- a/kernel/locking/rtmutex.c
+++ b/kernel/locking/rtmutex.c
@@ -1586,12 +1586,10 @@ void __sched rt_mutex_futex_unlock(struc
 void __rt_mutex_init(struct rt_mutex *lock, const char *name,
 		     struct lock_class_key *key)
 {
-	lock->owner = NULL;
-	raw_spin_lock_init(&lock->wait_lock);
-	lock->waiters = RB_ROOT_CACHED;
+	debug_check_no_locks_freed((void *)lock, sizeof(*lock));
+	lockdep_init_map(&lock->dep_map, name, key, 0);
 
-	if (name && key)
-		debug_rt_mutex_init(lock, name, key);
+	__rt_mutex_basic_init(lock);
 }
 EXPORT_SYMBOL_GPL(__rt_mutex_init);
 
@@ -1612,7 +1610,7 @@ EXPORT_SYMBOL_GPL(__rt_mutex_init);
 void rt_mutex_init_proxy_locked(struct rt_mutex *lock,
 				struct task_struct *proxy_owner)
 {
-	__rt_mutex_init(lock, NULL, NULL);
+	__rt_mutex_basic_init(lock);
 	rt_mutex_set_owner(lock, proxy_owner);
 }
 
--- a/kernel/locking/rtmutex_common.h
+++ b/kernel/locking/rtmutex_common.h
@@ -100,6 +100,13 @@ enum rtmutex_chainwalk {
 	RT_MUTEX_FULL_CHAINWALK,
 };
 
+static inline void __rt_mutex_basic_init(struct rt_mutex *lock)
+{
+	lock->owner = NULL;
+	raw_spin_lock_init(&lock->wait_lock);
+	lock->waiters = RB_ROOT_CACHED;
+}
+
 /*
  * PI-futex support (proxy locking functions, etc.):
  */