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From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org,
	linux-rt-users <linux-rt-users@vger.kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	Carsten Emde <C.Emde@osadl.org>,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
	John Kacur <jkacur@redhat.com>,
	Paul Gortmaker <paul.gortmaker@windriver.com>
Subject: [PATCH RT 02/27] create-rt-enqueue
Date: Fri, 13 Mar 2015 11:17:43 -0400	[thread overview]
Message-ID: <20150313151755.218355511@goodmis.org> (raw)
In-Reply-To: 20150313151741.132137234@goodmis.org

[-- Attachment #1: 0002-create-rt-enqueue.patch --]
[-- Type: text/plain, Size: 5533 bytes --]

3.4.106-rt132-rc1 stable review patch.
If anyone has any objections, please let me know.

------------------

From: Steven Rostedt <rostedt@goodmis.org>

To ease backporting patches, replace the plist functions with
rt_mutex_enqueue{_pi}() and rt_mutex_dequeue{_pi}() like upstream -rt does.
This will lower the conflicts in backporting patches.

This also makes sure that every time a waiter is added to the pi_list it
matches the priority of the waiter list.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 kernel/rtmutex.c | 58 ++++++++++++++++++++++++++++++++++++++------------------
 1 file changed, 40 insertions(+), 18 deletions(-)

diff --git a/kernel/rtmutex.c b/kernel/rtmutex.c
index a195da517edf..98d563b18c0e 100644
--- a/kernel/rtmutex.c
+++ b/kernel/rtmutex.c
@@ -154,6 +154,31 @@ static inline bool unlock_rt_mutex_safe(struct rt_mutex *lock)
 }
 #endif
 
+static inline void
+rt_mutex_enqueue(struct rt_mutex *lock, struct rt_mutex_waiter *waiter)
+{
+	plist_add(&waiter->list_entry, &lock->wait_list);
+}
+
+static inline void
+rt_mutex_dequeue(struct rt_mutex *lock, struct rt_mutex_waiter *waiter)
+{
+	plist_del(&waiter->list_entry, &lock->wait_list);
+}
+
+static inline void
+rt_mutex_enqueue_pi(struct task_struct *task, struct rt_mutex_waiter *waiter)
+{
+	waiter->pi_list_entry.prio = waiter->list_entry.prio;
+	plist_add(&waiter->pi_list_entry, &task->pi_waiters);
+}
+
+static inline void
+rt_mutex_dequeue_pi(struct task_struct *task, struct rt_mutex_waiter *waiter)
+{
+	plist_del(&waiter->pi_list_entry, &task->pi_waiters);
+}
+
 static inline void init_lists(struct rt_mutex *lock)
 {
 	if (unlikely(!lock->wait_list.node_list.prev))
@@ -360,9 +385,9 @@ static int rt_mutex_adjust_prio_chain(struct task_struct *task,
 	top_waiter = rt_mutex_top_waiter(lock);
 
 	/* Requeue the waiter */
-	plist_del(&waiter->list_entry, &lock->wait_list);
+	rt_mutex_dequeue(lock, waiter);
 	waiter->list_entry.prio = task->prio;
-	plist_add(&waiter->list_entry, &lock->wait_list);
+	rt_mutex_enqueue(lock, waiter);
 
 	/* Release the task */
 	raw_spin_unlock_irqrestore(&task->pi_lock, flags);
@@ -388,17 +413,15 @@ static int rt_mutex_adjust_prio_chain(struct task_struct *task,
 
 	if (waiter == rt_mutex_top_waiter(lock)) {
 		/* Boost the owner */
-		plist_del(&top_waiter->pi_list_entry, &task->pi_waiters);
-		waiter->pi_list_entry.prio = waiter->list_entry.prio;
-		plist_add(&waiter->pi_list_entry, &task->pi_waiters);
+		rt_mutex_dequeue_pi(task, top_waiter);
+		rt_mutex_enqueue_pi(task, waiter);
 		__rt_mutex_adjust_prio(task);
 
 	} else if (top_waiter == waiter) {
 		/* Deboost the owner */
-		plist_del(&waiter->pi_list_entry, &task->pi_waiters);
+		rt_mutex_dequeue_pi(task, waiter);
 		waiter = rt_mutex_top_waiter(lock);
-		waiter->pi_list_entry.prio = waiter->list_entry.prio;
-		plist_add(&waiter->pi_list_entry, &task->pi_waiters);
+		rt_mutex_enqueue_pi(task, waiter);
 		__rt_mutex_adjust_prio(task);
 	}
 
@@ -514,7 +537,7 @@ __try_to_take_rt_mutex(struct rt_mutex *lock, struct task_struct *task,
 
 		/* remove the queued waiter. */
 		if (waiter) {
-			plist_del(&waiter->list_entry, &lock->wait_list);
+			rt_mutex_dequeue(lock, waiter);
 			task->pi_blocked_on = NULL;
 		}
 
@@ -524,8 +547,7 @@ __try_to_take_rt_mutex(struct rt_mutex *lock, struct task_struct *task,
 		 */
 		if (rt_mutex_has_waiters(lock)) {
 			top = rt_mutex_top_waiter(lock);
-			top->pi_list_entry.prio = top->list_entry.prio;
-			plist_add(&top->pi_list_entry, &task->pi_waiters);
+			rt_mutex_enqueue_pi(task, top);
 		}
 		raw_spin_unlock_irqrestore(&task->pi_lock, flags);
 	}
@@ -603,7 +625,7 @@ static int task_blocks_on_rt_mutex(struct rt_mutex *lock,
 	/* Get the top priority waiter on the lock */
 	if (rt_mutex_has_waiters(lock))
 		top_waiter = rt_mutex_top_waiter(lock);
-	plist_add(&waiter->list_entry, &lock->wait_list);
+	rt_mutex_enqueue(lock, waiter);
 
 	task->pi_blocked_on = waiter;
 
@@ -614,8 +636,8 @@ static int task_blocks_on_rt_mutex(struct rt_mutex *lock,
 
 	raw_spin_lock_irqsave(&owner->pi_lock, flags);
 	if (waiter == rt_mutex_top_waiter(lock)) {
-		plist_del(&top_waiter->pi_list_entry, &owner->pi_waiters);
-		plist_add(&waiter->pi_list_entry, &owner->pi_waiters);
+		rt_mutex_dequeue_pi(owner, top_waiter);
+		rt_mutex_enqueue_pi(owner, waiter);
 
 		__rt_mutex_adjust_prio(owner);
 		if (rt_mutex_real_waiter(owner->pi_blocked_on))
@@ -676,7 +698,7 @@ static void wakeup_next_waiter(struct rt_mutex *lock)
 	 * boosted mode and go back to normal after releasing
 	 * lock->wait_lock.
 	 */
-	plist_del(&waiter->pi_list_entry, &current->pi_waiters);
+	rt_mutex_dequeue_pi(current, waiter);
 
 	/*
 	 * As we are waking up the top waiter, and the waiter stays
@@ -713,7 +735,7 @@ static void remove_waiter(struct rt_mutex *lock,
 	unsigned long flags;
 
 	raw_spin_lock_irqsave(&current->pi_lock, flags);
-	plist_del(&waiter->list_entry, &lock->wait_list);
+	rt_mutex_dequeue(lock, waiter);
 	current->pi_blocked_on = NULL;
 	raw_spin_unlock_irqrestore(&current->pi_lock, flags);
 
@@ -724,13 +746,13 @@ static void remove_waiter(struct rt_mutex *lock,
 
 		raw_spin_lock_irqsave(&owner->pi_lock, flags);
 
-		plist_del(&waiter->pi_list_entry, &owner->pi_waiters);
+		rt_mutex_dequeue_pi(owner, waiter);
 
 		if (rt_mutex_has_waiters(lock)) {
 			struct rt_mutex_waiter *next;
 
 			next = rt_mutex_top_waiter(lock);
-			plist_add(&next->pi_list_entry, &owner->pi_waiters);
+			rt_mutex_enqueue_pi(owner, next);
 		}
 		__rt_mutex_adjust_prio(owner);
 
-- 
2.1.4



  parent reply	other threads:[~2015-03-13 15:17 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-13 15:17 [PATCH RT 00/27] Linux 3.4.106-rt132-rc1 Steven Rostedt
2015-03-13 15:17 ` [PATCH RT 01/27] gpio: omap: use raw locks for locking Steven Rostedt
2015-03-13 15:17 ` Steven Rostedt [this message]
2015-03-13 15:17 ` [PATCH RT 03/27] rtmutex: Simplify rtmutex_slowtrylock() Steven Rostedt
2015-03-13 15:17 ` [PATCH RT 04/27] rtmutex: Simplify and document try_to_take_rtmutex() Steven Rostedt
2015-03-13 15:17 ` [PATCH RT 05/27] rtmutex: No need to keep task ref for lock owner check Steven Rostedt
2015-03-13 15:17 ` [PATCH RT 06/27] rtmutex: Clarify the boost/deboost part Steven Rostedt
2015-03-13 15:17 ` [PATCH RT 07/27] rtmutex: Document pi chain walk Steven Rostedt
2015-03-13 15:17 ` [PATCH RT 08/27] rtmutex: Simplify remove_waiter() Steven Rostedt
2015-03-13 15:17 ` [PATCH RT 09/27] rtmutex: Confine deadlock logic to futex Steven Rostedt
2015-03-13 15:17 ` [PATCH RT 10/27] rtmutex: Cleanup deadlock detector debug logic Steven Rostedt
2015-03-13 15:17 ` [PATCH RT 11/27] rtmutex: Avoid pointless requeueing in the deadlock detection chain walk Steven Rostedt
2015-03-13 15:17 ` [PATCH RT 12/27] futex: Make unlock_pi more robust Steven Rostedt
2015-03-13 15:17 ` [PATCH RT 13/27] futex: Use futex_top_waiter() in lookup_pi_state() Steven Rostedt
2015-03-13 15:17 ` [PATCH RT 14/27] futex: Split out the waiter check from lookup_pi_state() Steven Rostedt
2015-03-13 15:17 ` [PATCH RT 15/27] futex: Split out the first waiter attachment " Steven Rostedt
2015-03-13 15:17 ` [PATCH RT 16/27] futex: Simplify futex_lock_pi_atomic() and make it more robust Steven Rostedt
2015-03-13 15:17 ` [PATCH RT 17/27] rt-mutex: avoid a NULL pointer dereference on deadlock Steven Rostedt
2015-03-13 15:17 ` [PATCH RT 18/27] x86: UV: raw_spinlock conversion Steven Rostedt
2015-03-13 15:18 ` [PATCH RT 20/27] arm/futex: disable preemption during futex_atomic_cmpxchg_inatomic() Steven Rostedt
2015-03-13 15:18 ` [PATCH RT 21/27] ARM: cmpxchg: define __HAVE_ARCH_CMPXCHG for armv6 and later Steven Rostedt
2015-03-13 15:18 ` [PATCH RT 22/27] sas-ata/isci: dontt disable interrupts in qc_issue handler Steven Rostedt
2015-03-13 15:18 ` [PATCH RT 23/27] scheduling while atomic in cgroup code Steven Rostedt
2015-03-13 15:18 ` [PATCH RT 24/27] work-simple: Simple work queue implemenation Steven Rostedt
2015-03-13 15:18 ` [PATCH RT 25/27] sunrpc: make svc_xprt_do_enqueue() use get_cpu_light() Steven Rostedt
2015-03-13 15:18 ` [PATCH RT 26/27] lockdep: selftest: fix warnings due to missing PREEMPT_RT conditionals Steven Rostedt
2015-03-13 15:18 ` [PATCH RT 27/27] Linux 3.4.106-rt132-rc1 Steven Rostedt

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