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From: Peter Zijlstra <peterz@infradead.org>
To: tglx@linutronix.de
Cc: mingo@kernel.org, juri.lelli@arm.com, rostedt@goodmis.org,
	xlpang@redhat.com, bigeasy@linutronix.de,
	linux-kernel@vger.kernel.org, mathieu.desnoyers@efficios.com,
	jdesfossez@efficios.com, bristot@redhat.com,
	dvhart@infradead.org, peterz@infradead.org
Subject: [PATCH -v6 03/13] futex: Remove rt_mutex_deadlock_account_*()
Date: Wed, 22 Mar 2017 11:35:50 +0100
Message-ID: <20170322104151.652692478@infradead.org> (raw)
In-Reply-To: <20170322103547.756091212@infradead.org>


[-- Attachment #0: peterz-futex-cleanup-deadlock.patch --]
[-- Type: text/plain, Size: 4950 bytes --]

These are unused and clutter up the code.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
 kernel/locking/rtmutex-debug.c |    9 -------
 kernel/locking/rtmutex-debug.h |    3 --
 kernel/locking/rtmutex.c       |   47 +++++++++++++++--------------------------
 kernel/locking/rtmutex.h       |    2 -
 4 files changed, 18 insertions(+), 43 deletions(-)

--- a/kernel/locking/rtmutex-debug.c
+++ b/kernel/locking/rtmutex-debug.c
@@ -173,12 +173,3 @@ void debug_rt_mutex_init(struct rt_mutex
 	lock->name = name;
 }
 
-void
-rt_mutex_deadlock_account_lock(struct rt_mutex *lock, struct task_struct *task)
-{
-}
-
-void rt_mutex_deadlock_account_unlock(struct task_struct *task)
-{
-}
-
--- a/kernel/locking/rtmutex-debug.h
+++ b/kernel/locking/rtmutex-debug.h
@@ -9,9 +9,6 @@
  * This file contains macros used solely by rtmutex.c. Debug version.
  */
 
-extern void
-rt_mutex_deadlock_account_lock(struct rt_mutex *lock, struct task_struct *task);
-extern void rt_mutex_deadlock_account_unlock(struct task_struct *task);
 extern void debug_rt_mutex_init_waiter(struct rt_mutex_waiter *waiter);
 extern void debug_rt_mutex_free_waiter(struct rt_mutex_waiter *waiter);
 extern void debug_rt_mutex_init(struct rt_mutex *lock, const char *name);
--- a/kernel/locking/rtmutex.c
+++ b/kernel/locking/rtmutex.c
@@ -936,8 +936,6 @@ static int try_to_take_rt_mutex(struct r
 	 */
 	rt_mutex_set_owner(lock, task);
 
-	rt_mutex_deadlock_account_lock(lock, task);
-
 	return 1;
 }
 
@@ -1340,8 +1338,6 @@ static bool __sched rt_mutex_slowunlock(
 
 	debug_rt_mutex_unlock(lock);
 
-	rt_mutex_deadlock_account_unlock(current);
-
 	/*
 	 * We must be careful here if the fast path is enabled. If we
 	 * have no waiters queued we cannot set owner to NULL here
@@ -1407,11 +1403,10 @@ rt_mutex_fastlock(struct rt_mutex *lock,
 				struct hrtimer_sleeper *timeout,
 				enum rtmutex_chainwalk chwalk))
 {
-	if (likely(rt_mutex_cmpxchg_acquire(lock, NULL, current))) {
-		rt_mutex_deadlock_account_lock(lock, current);
+	if (likely(rt_mutex_cmpxchg_acquire(lock, NULL, current)))
 		return 0;
-	} else
-		return slowfn(lock, state, NULL, RT_MUTEX_MIN_CHAINWALK);
+
+	return slowfn(lock, state, NULL, RT_MUTEX_MIN_CHAINWALK);
 }
 
 static inline int
@@ -1423,21 +1418,19 @@ rt_mutex_timed_fastlock(struct rt_mutex
 				      enum rtmutex_chainwalk chwalk))
 {
 	if (chwalk == RT_MUTEX_MIN_CHAINWALK &&
-	    likely(rt_mutex_cmpxchg_acquire(lock, NULL, current))) {
-		rt_mutex_deadlock_account_lock(lock, current);
+	    likely(rt_mutex_cmpxchg_acquire(lock, NULL, current)))
 		return 0;
-	} else
-		return slowfn(lock, state, timeout, chwalk);
+
+	return slowfn(lock, state, timeout, chwalk);
 }
 
 static inline int
 rt_mutex_fasttrylock(struct rt_mutex *lock,
 		     int (*slowfn)(struct rt_mutex *lock))
 {
-	if (likely(rt_mutex_cmpxchg_acquire(lock, NULL, current))) {
-		rt_mutex_deadlock_account_lock(lock, current);
+	if (likely(rt_mutex_cmpxchg_acquire(lock, NULL, current)))
 		return 1;
-	}
+
 	return slowfn(lock);
 }
 
@@ -1447,19 +1440,18 @@ rt_mutex_fastunlock(struct rt_mutex *loc
 				   struct wake_q_head *wqh))
 {
 	DEFINE_WAKE_Q(wake_q);
+	bool deboost;
 
-	if (likely(rt_mutex_cmpxchg_release(lock, current, NULL))) {
-		rt_mutex_deadlock_account_unlock(current);
+	if (likely(rt_mutex_cmpxchg_release(lock, current, NULL)))
+		return;
 
-	} else {
-		bool deboost = slowfn(lock, &wake_q);
+	deboost = slowfn(lock, &wake_q);
 
-		wake_up_q(&wake_q);
+	wake_up_q(&wake_q);
 
-		/* Undo pi boosting if necessary: */
-		if (deboost)
-			rt_mutex_adjust_prio(current);
-	}
+	/* Undo pi boosting if necessary: */
+	if (deboost)
+		rt_mutex_adjust_prio(current);
 }
 
 /**
@@ -1570,10 +1562,9 @@ EXPORT_SYMBOL_GPL(rt_mutex_unlock);
 bool __sched rt_mutex_futex_unlock(struct rt_mutex *lock,
 				   struct wake_q_head *wqh)
 {
-	if (likely(rt_mutex_cmpxchg_release(lock, current, NULL))) {
-		rt_mutex_deadlock_account_unlock(current);
+	if (likely(rt_mutex_cmpxchg_release(lock, current, NULL)))
 		return false;
-	}
+
 	return rt_mutex_slowunlock(lock, wqh);
 }
 
@@ -1635,7 +1626,6 @@ void rt_mutex_init_proxy_locked(struct r
 	__rt_mutex_init(lock, NULL);
 	debug_rt_mutex_proxy_lock(lock, proxy_owner);
 	rt_mutex_set_owner(lock, proxy_owner);
-	rt_mutex_deadlock_account_lock(lock, proxy_owner);
 }
 
 /**
@@ -1655,7 +1645,6 @@ void rt_mutex_proxy_unlock(struct rt_mut
 {
 	debug_rt_mutex_proxy_unlock(lock);
 	rt_mutex_set_owner(lock, NULL);
-	rt_mutex_deadlock_account_unlock(proxy_owner);
 }
 
 /**
--- a/kernel/locking/rtmutex.h
+++ b/kernel/locking/rtmutex.h
@@ -11,8 +11,6 @@
  */
 
 #define rt_mutex_deadlock_check(l)			(0)
-#define rt_mutex_deadlock_account_lock(m, t)		do { } while (0)
-#define rt_mutex_deadlock_account_unlock(l)		do { } while (0)
 #define debug_rt_mutex_init_waiter(w)			do { } while (0)
 #define debug_rt_mutex_free_waiter(w)			do { } while (0)
 #define debug_rt_mutex_lock(l)				do { } while (0)

  parent reply index

Thread overview: 60+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-03-22 10:35 [PATCH -v6 00/13] The arduous story of FUTEX_UNLOCK_PI Peter Zijlstra
2017-03-22 10:35 ` [PATCH -v6 01/13] futex: Cleanup variable names for futex_top_waiter() Peter Zijlstra
2017-03-23 18:19   ` [tip:locking/core] " tip-bot for Peter Zijlstra
2017-03-24 21:11   ` [PATCH -v6 01/13] " Darren Hart
2017-03-22 10:35 ` [PATCH -v6 02/13] futex: Use smp_store_release() in mark_wake_futex() Peter Zijlstra
2017-03-23 18:19   ` [tip:locking/core] " tip-bot for Peter Zijlstra
2017-03-24 21:16   ` [PATCH -v6 02/13] " Darren Hart
2017-03-22 10:35 ` Peter Zijlstra [this message]
2017-03-23 18:20   ` [tip:locking/core] futex: Remove rt_mutex_deadlock_account_*() tip-bot for Peter Zijlstra
2017-03-24 21:29   ` [PATCH -v6 03/13] " Darren Hart
2017-03-24 21:31     ` Darren Hart
2017-03-22 10:35 ` [PATCH -v6 04/13] futex,rt_mutex: Provide futex specific rt_mutex API Peter Zijlstra
2017-03-23 18:20   ` [tip:locking/core] " tip-bot for Peter Zijlstra
2017-03-25  0:37   ` [PATCH -v6 04/13] " Darren Hart
2017-04-06 12:15     ` Peter Zijlstra
2017-04-06 17:02       ` Darren Hart
2017-04-05 15:02   ` Darren Hart
2017-04-06 12:17     ` Peter Zijlstra
2017-04-06 17:08       ` Darren Hart
2017-03-22 10:35 ` [PATCH -v6 05/13] futex: Change locking rules Peter Zijlstra
2017-03-23 18:21   ` [tip:locking/core] " tip-bot for Peter Zijlstra
2017-04-05 21:18   ` [PATCH -v6 05/13] " Darren Hart
2017-04-06 12:28     ` Peter Zijlstra
2017-04-06 15:58       ` Joe Perches
2017-04-06 17:21       ` Darren Hart
2017-03-22 10:35 ` [PATCH -v6 06/13] futex: Cleanup refcounting Peter Zijlstra
2017-03-23 18:21   ` [tip:locking/core] " tip-bot for Peter Zijlstra
2017-04-05 21:29   ` [PATCH -v6 06/13] " Darren Hart
2017-03-22 10:35 ` [PATCH -v6 07/13] futex: Rework inconsistent rt_mutex/futex_q state Peter Zijlstra
2017-03-23 18:22   ` [tip:locking/core] " tip-bot for Peter Zijlstra
2017-04-05 21:58   ` [PATCH -v6 07/13] " Darren Hart
2017-03-22 10:35 ` [PATCH -v6 08/13] futex: Pull rt_mutex_futex_unlock() out from under hb->lock Peter Zijlstra
2017-03-23 18:22   ` [tip:locking/core] " tip-bot for Peter Zijlstra
2017-04-05 23:52   ` [PATCH -v6 08/13] " Darren Hart
2017-04-06 12:42     ` Peter Zijlstra
2017-04-06 17:42       ` Darren Hart
2017-03-22 10:35 ` [PATCH -v6 09/13] futex,rt_mutex: Introduce rt_mutex_init_waiter() Peter Zijlstra
2017-03-23 18:23   ` [tip:locking/core] " tip-bot for Peter Zijlstra
2017-04-05 23:57   ` [PATCH -v6 09/13] " Darren Hart
2017-03-22 10:35 ` [PATCH -v6 10/13] futex,rt_mutex: Restructure rt_mutex_finish_proxy_lock() Peter Zijlstra
2017-03-23 18:23   ` [tip:locking/core] " tip-bot for Peter Zijlstra
2017-04-07 23:30   ` [PATCH -v6 10/13] " Darren Hart
2017-04-07 23:35     ` Darren Hart
2017-03-22 10:35 ` [PATCH -v6 11/13] futex: Rework futex_lock_pi() to use rt_mutex_*_proxy_lock() Peter Zijlstra
2017-03-23 18:24   ` [tip:locking/core] " tip-bot for Peter Zijlstra
2017-04-08  0:55   ` [PATCH -v6 11/13] " Darren Hart
2017-04-10 15:51   ` alexander.levin
2017-04-10 16:03     ` Thomas Gleixner
2017-04-14  9:30       ` [tip:locking/core] futex: Avoid freeing an active timer tip-bot for Thomas Gleixner
2017-03-22 10:35 ` [PATCH -v6 12/13] futex: futex_unlock_pi() determinism Peter Zijlstra
2017-03-23 18:24   ` [tip:locking/core] futex: Futex_unlock_pi() determinism tip-bot for Peter Zijlstra
2017-04-08  1:27   ` [PATCH -v6 12/13] futex: futex_unlock_pi() determinism Darren Hart
2017-03-22 10:36 ` [PATCH -v6 13/13] futex: futex_lock_pi() vs PREEMPT_RT_FULL Peter Zijlstra
2017-03-23 18:25   ` [tip:locking/core] futex: Drop hb->lock before enqueueing on the rtmutex tip-bot for Peter Zijlstra
2017-04-08  2:26   ` [PATCH -v6 13/13] futex: futex_lock_pi() vs PREEMPT_RT_FULL Darren Hart
2017-04-08  5:22     ` Mike Galbraith
2017-04-10  8:43     ` Sebastian Andrzej Siewior
2017-04-10  9:08     ` Peter Zijlstra
2017-04-10 16:05       ` Darren Hart
2017-03-24  1:45 ` [PATCH -v6 00/13] The arduous story of FUTEX_UNLOCK_PI Darren Hart

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