[ANNOUNCE] 3.12.0-rt2

[ANNOUNCE] 3.12.0-rt2

[Sebastian Andrzej Siewior]

Dear RT folks!

I'm pleased to announce the v3.12.0-rt2 patch set.

Changes since v3.12.0-rt1
- fix for iwlwifi which tried to take a sleeping in irq context. Patch
  has been available & disabled in the queue and is now enabled after Clark
  recently reported that it works.
- tried to fix AT91's "already-free IRQ" and highres problem. Michael
  Langfinge reported it initially and Sami Pietikäinen sent a patch for
  the "already-free IRQ" problem. Based on another patch I looked at the
  highres patch and tried to fix it. As I don't have the hardware, some
  feedback would be nice.
- a fix for cpu down on !RT. Patch by Tiejun Chen.
- Mike Galbraith and Matt Cowell reported a dead lock with CONFIG_NO_HZ_FULL. 
  To fix this trylock deadlock, the sleeping lock is now taken with irqs off.
  I would be interrested if this change causes any noticable latencys
  for anyone.

Known issues:

      - bcache is disabled.

      - an ancient race (since we got sleeping spinlocks) where the
        TASK_TRACED state is temporary replaced while waiting on a rw
        lock and the task can't be traced.

The delta patch against v3.12.0-rt1 is appended below and can be found
here:
   https://www.kernel.org/pub/linux/kernel/projects/rt/3.12/incr/patch-3.12.0-rt1-rt2.patch.xz

The RT patch against 3.12 can be found here:

   https://www.kernel.org/pub/linux/kernel/projects/rt/3.12/patch-3.12.0-rt2.patch.xz

The split quilt queue is available at:

   https://www.kernel.org/pub/linux/kernel/projects/rt/3.12/patches-3.12.0-rt2.tar.xz

Sebastian

diff --git a/arch/arm/mach-at91/at91rm9200_time.c b/arch/arm/mach-at91/at91rm9200_time.c
index 0bbd8e6..35f7b26 100644
--- a/arch/arm/mach-at91/at91rm9200_time.c
+++ b/arch/arm/mach-at91/at91rm9200_time.c
@@ -134,7 +134,7 @@ clkevt32k_mode(enum clock_event_mode mode, struct clock_event_device *dev)
 		break;
 	case CLOCK_EVT_MODE_SHUTDOWN:
 	case CLOCK_EVT_MODE_UNUSED:
-		remove_irq(AT91_ID_SYS, &at91rm9200_timer_irq);
+		remove_irq(NR_IRQS_LEGACY + AT91_ID_SYS, &at91rm9200_timer_irq);
 	case CLOCK_EVT_MODE_RESUME:
 		irqmask = 0;
 		break;
diff --git a/arch/arm/mach-at91/at91sam926x_time.c b/arch/arm/mach-at91/at91sam926x_time.c
index 01681e6..1c4c487 100644
--- a/arch/arm/mach-at91/at91sam926x_time.c
+++ b/arch/arm/mach-at91/at91sam926x_time.c
@@ -87,7 +87,7 @@ pit_clkevt_mode(enum clock_event_mode mode, struct clock_event_device *dev)
 	switch (mode) {
 	case CLOCK_EVT_MODE_PERIODIC:
 		/* Set up irq handler */
-		setup_irq(AT91_ID_SYS, &at91sam926x_pit_irq);
+		setup_irq(at91sam926x_pit_irq.irq, &at91sam926x_pit_irq);
 		/* update clocksource counter */
 		pit_cnt += pit_cycle * PIT_PICNT(pit_read(AT91_PIT_PIVR));
 		pit_write(AT91_PIT_MR, (pit_cycle - 1) | AT91_PIT_PITEN
@@ -100,7 +100,7 @@ pit_clkevt_mode(enum clock_event_mode mode, struct clock_event_device *dev)
 	case CLOCK_EVT_MODE_UNUSED:
 		/* disable irq, leaving the clocksource active */
 		pit_write(AT91_PIT_MR, (pit_cycle - 1) | AT91_PIT_PITEN);
-		remove_irq(AT91_ID_SYS, &at91sam926x_pit_irq);
+		remove_irq(at91sam926x_pit_irq.irq, &at91sam926x_pit_irq);
 		break;
 	case CLOCK_EVT_MODE_RESUME:
 		break;
diff --git a/drivers/clocksource/tcb_clksrc.c b/drivers/clocksource/tcb_clksrc.c
index c08ec1d..74fe7f7 100644
--- a/drivers/clocksource/tcb_clksrc.c
+++ b/drivers/clocksource/tcb_clksrc.c
@@ -182,9 +182,10 @@ static struct irqaction tc_irqaction = {
 	.handler	= ch2_irq,
 };
 
-static void __init setup_clkevents(struct atmel_tc *tc, int divisor_idx)
+static void __init setup_clkevents(struct atmel_tc *tc, int clk32k_divisor_idx)
 {
-	unsigned divisor = atmel_tc_divisors[divisor_idx];
+	unsigned divisor = atmel_tc_divisors[clk32k_divisor_idx];
+	u32 freq;
 	struct clk *t2_clk = tc->clk[2];
 	int irq = tc->irq[2];
 
@@ -193,10 +194,14 @@ static void __init setup_clkevents(struct atmel_tc *tc, int divisor_idx)
 	tc_irqaction.dev_id = &clkevt;
 
 	timer_clock = clk32k_divisor_idx;
+	if (!divisor)
+		freq = 32768;
+	else
+		freq = clk_get_rate(t2_clk) / divisor;
 
 	clkevt.clkevt.cpumask = cpumask_of(0);
 
-	clockevents_config_and_register(&clkevt.clkevt, 32768, 1, 0xffff);
+	clockevents_config_and_register(&clkevt.clkevt, freq, 1, 0xffff);
 
 	setup_irq(irq, &tc_irqaction);
 }
diff --git a/drivers/net/wireless/iwlwifi/pcie/trans.c b/drivers/net/wireless/iwlwifi/pcie/trans.c
index c3f904d..d07cdca 100644
--- a/drivers/net/wireless/iwlwifi/pcie/trans.c
+++ b/drivers/net/wireless/iwlwifi/pcie/trans.c
@@ -1375,6 +1375,20 @@ static const struct iwl_trans_ops trans_ops_pcie = {
 	.set_bits_mask = iwl_trans_pcie_set_bits_mask,
 };
 
+#ifdef CONFIG_PREEMPT_RT_BASE
+static irqreturn_t iwl_rt_irq_handler(int irq, void *dev_id)
+{
+	irqreturn_t ret;
+
+	local_bh_disable();
+	ret = iwl_pcie_isr_ict(irq, dev_id);
+	local_bh_enable();
+	if (ret == IRQ_WAKE_THREAD)
+		ret = iwl_pcie_irq_handler(irq, dev_id);
+	return ret;
+}
+#endif
+
 struct iwl_trans *iwl_trans_pcie_alloc(struct pci_dev *pdev,
 				       const struct pci_device_id *ent,
 				       const struct iwl_cfg *cfg)
@@ -1493,9 +1507,14 @@ struct iwl_trans *iwl_trans_pcie_alloc(struct pci_dev *pdev,
 	if (iwl_pcie_alloc_ict(trans))
 		goto out_free_cmd_pool;
 
+#ifdef CONFIG_PREEMPT_RT_BASE
+	err = request_threaded_irq(pdev->irq, NULL, iwl_rt_irq_handler,
+				IRQF_SHARED | IRQF_ONESHOT, DRV_NAME, trans);
+#else
 	err = request_threaded_irq(pdev->irq, iwl_pcie_isr_ict,
 				   iwl_pcie_irq_handler,
 				   IRQF_SHARED, DRV_NAME, trans);
+#endif
 	if (err) {
 		IWL_ERR(trans, "Error allocating IRQ %d\n", pdev->irq);
 		goto out_free_ict;
diff --git a/kernel/cpu.c b/kernel/cpu.c
index f07af96..c36b075 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -593,6 +593,7 @@ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen)
 		err = -EBUSY;
 		goto restore_cpus;
 	}
+	migrate_enable();
 
 	cpu_hotplug_begin();
 	err = cpu_unplug_begin(cpu);
@@ -646,7 +647,6 @@ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen)
 out_release:
 	cpu_unplug_done(cpu);
 out_cancel:
-	migrate_enable();
 	cpu_hotplug_done();
 	if (!err)
 		cpu_notify_nofail(CPU_POST_DEAD | mod, hcpu);
diff --git a/kernel/futex.c b/kernel/futex.c
index 0ef419d..404d0bd 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -891,7 +891,7 @@ static int wake_futex_pi(u32 __user *uaddr, u32 uval, struct futex_q *this)
 	if (pi_state->owner != current)
 		return -EINVAL;
 
-	raw_spin_lock(&pi_state->pi_mutex.wait_lock);
+	raw_spin_lock_irq(&pi_state->pi_mutex.wait_lock);
 	new_owner = rt_mutex_next_owner(&pi_state->pi_mutex);
 
 	/*
@@ -917,21 +917,21 @@ static int wake_futex_pi(u32 __user *uaddr, u32 uval, struct futex_q *this)
 		else if (curval != uval)
 			ret = -EINVAL;
 		if (ret) {
-			raw_spin_unlock(&pi_state->pi_mutex.wait_lock);
+			raw_spin_unlock_irq(&pi_state->pi_mutex.wait_lock);
 			return ret;
 		}
 	}
 
-	raw_spin_lock_irq(&pi_state->owner->pi_lock);
+	raw_spin_lock(&pi_state->owner->pi_lock);
 	WARN_ON(list_empty(&pi_state->list));
 	list_del_init(&pi_state->list);
-	raw_spin_unlock_irq(&pi_state->owner->pi_lock);
+	raw_spin_unlock(&pi_state->owner->pi_lock);
 
-	raw_spin_lock_irq(&new_owner->pi_lock);
+	raw_spin_lock(&new_owner->pi_lock);
 	WARN_ON(!list_empty(&pi_state->list));
 	list_add(&pi_state->list, &new_owner->pi_state_list);
 	pi_state->owner = new_owner;
-	raw_spin_unlock_irq(&new_owner->pi_lock);
+	raw_spin_unlock(&new_owner->pi_lock);
 
 	raw_spin_unlock(&pi_state->pi_mutex.wait_lock);
 	rt_mutex_unlock(&pi_state->pi_mutex);
@@ -1762,11 +1762,11 @@ static int fixup_owner(u32 __user *uaddr, struct futex_q *q, int locked)
 		 * we returned due to timeout or signal without taking the
 		 * rt_mutex. Too late.
 		 */
-		raw_spin_lock(&q->pi_state->pi_mutex.wait_lock);
+		raw_spin_lock_irq(&q->pi_state->pi_mutex.wait_lock);
 		owner = rt_mutex_owner(&q->pi_state->pi_mutex);
 		if (!owner)
 			owner = rt_mutex_next_owner(&q->pi_state->pi_mutex);
-		raw_spin_unlock(&q->pi_state->pi_mutex.wait_lock);
+		raw_spin_unlock_irq(&q->pi_state->pi_mutex.wait_lock);
 		ret = fixup_pi_state_owner(uaddr, q, owner);
 		goto out;
 	}
diff --git a/kernel/rtmutex.c b/kernel/rtmutex.c
index b4c651e..c2f3f63 100644
--- a/kernel/rtmutex.c
+++ b/kernel/rtmutex.c
@@ -298,7 +298,7 @@ static int rt_mutex_adjust_prio_chain(struct task_struct *task,
 	plist_add(&waiter->list_entry, &lock->wait_list);
 
 	/* Release the task */
-	raw_spin_unlock_irqrestore(&task->pi_lock, flags);
+	raw_spin_unlock(&task->pi_lock);
 	if (!rt_mutex_owner(lock)) {
 		struct rt_mutex_waiter *lock_top_waiter;
 
@@ -309,7 +309,7 @@ static int rt_mutex_adjust_prio_chain(struct task_struct *task,
 		lock_top_waiter = rt_mutex_top_waiter(lock);
 		if (top_waiter != lock_top_waiter)
 			rt_mutex_wake_waiter(lock_top_waiter);
-		raw_spin_unlock(&lock->wait_lock);
+		raw_spin_unlock_irqrestore(&lock->wait_lock, flags);
 		goto out_put_task;
 	}
 	put_task_struct(task);
@@ -317,7 +317,7 @@ static int rt_mutex_adjust_prio_chain(struct task_struct *task,
 	/* Grab the next task */
 	task = rt_mutex_owner(lock);
 	get_task_struct(task);
-	raw_spin_lock_irqsave(&task->pi_lock, flags);
+	raw_spin_lock(&task->pi_lock);
 
 	if (waiter == rt_mutex_top_waiter(lock)) {
 		/* Boost the owner */
@@ -335,10 +335,10 @@ static int rt_mutex_adjust_prio_chain(struct task_struct *task,
 		__rt_mutex_adjust_prio(task);
 	}
 
-	raw_spin_unlock_irqrestore(&task->pi_lock, flags);
+	raw_spin_unlock(&task->pi_lock);
 
 	top_waiter = rt_mutex_top_waiter(lock);
-	raw_spin_unlock(&lock->wait_lock);
+	raw_spin_unlock_irqrestore(&lock->wait_lock, flags);
 
 	if (!detect_deadlock && waiter != top_waiter)
 		goto out_put_task;
@@ -425,10 +425,9 @@ __try_to_take_rt_mutex(struct rt_mutex *lock, struct task_struct *task,
 	/* We got the lock. */
 
 	if (waiter || rt_mutex_has_waiters(lock)) {
-		unsigned long flags;
 		struct rt_mutex_waiter *top;
 
-		raw_spin_lock_irqsave(&task->pi_lock, flags);
+		raw_spin_lock(&task->pi_lock);
 
 		/* remove the queued waiter. */
 		if (waiter) {
@@ -445,7 +444,7 @@ __try_to_take_rt_mutex(struct rt_mutex *lock, struct task_struct *task,
 			top->pi_list_entry.prio = top->list_entry.prio;
 			plist_add(&top->pi_list_entry, &task->pi_waiters);
 		}
-		raw_spin_unlock_irqrestore(&task->pi_lock, flags);
+		raw_spin_unlock(&task->pi_lock);
 	}
 
 	debug_rt_mutex_lock(lock);
@@ -478,10 +477,9 @@ static int task_blocks_on_rt_mutex(struct rt_mutex *lock,
 {
 	struct task_struct *owner = rt_mutex_owner(lock);
 	struct rt_mutex_waiter *top_waiter = waiter;
-	unsigned long flags;
 	int chain_walk = 0, res;
 
-	raw_spin_lock_irqsave(&task->pi_lock, flags);
+	raw_spin_lock(&task->pi_lock);
 
 	/*
 	 * In the case of futex requeue PI, this will be a proxy
@@ -493,7 +491,7 @@ static int task_blocks_on_rt_mutex(struct rt_mutex *lock,
 	 * the task if PI_WAKEUP_INPROGRESS is set.
 	 */
 	if (task != current && task->pi_blocked_on == PI_WAKEUP_INPROGRESS) {
-		raw_spin_unlock_irqrestore(&task->pi_lock, flags);
+		raw_spin_unlock(&task->pi_lock);
 		return -EAGAIN;
 	}
 
@@ -512,20 +510,20 @@ static int task_blocks_on_rt_mutex(struct rt_mutex *lock,
 
 	task->pi_blocked_on = waiter;
 
-	raw_spin_unlock_irqrestore(&task->pi_lock, flags);
+	raw_spin_unlock(&task->pi_lock);
 
 	if (!owner)
 		return 0;
 
 	if (waiter == rt_mutex_top_waiter(lock)) {
-		raw_spin_lock_irqsave(&owner->pi_lock, flags);
+		raw_spin_lock(&owner->pi_lock);
 		plist_del(&top_waiter->pi_list_entry, &owner->pi_waiters);
 		plist_add(&waiter->pi_list_entry, &owner->pi_waiters);
 
 		__rt_mutex_adjust_prio(owner);
 		if (rt_mutex_real_waiter(owner->pi_blocked_on))
 			chain_walk = 1;
-		raw_spin_unlock_irqrestore(&owner->pi_lock, flags);
+		raw_spin_unlock(&owner->pi_lock);
 	}
 	else if (debug_rt_mutex_detect_deadlock(waiter, detect_deadlock))
 		chain_walk = 1;
@@ -540,12 +538,12 @@ static int task_blocks_on_rt_mutex(struct rt_mutex *lock,
 	 */
 	get_task_struct(owner);
 
-	raw_spin_unlock(&lock->wait_lock);
+	raw_spin_unlock_irq(&lock->wait_lock);
 
 	res = rt_mutex_adjust_prio_chain(owner, detect_deadlock, lock, waiter,
 					 task);
 
-	raw_spin_lock(&lock->wait_lock);
+	raw_spin_lock_irq(&lock->wait_lock);
 
 	return res;
 }
@@ -560,9 +558,8 @@ static int task_blocks_on_rt_mutex(struct rt_mutex *lock,
 static void wakeup_next_waiter(struct rt_mutex *lock)
 {
 	struct rt_mutex_waiter *waiter;
-	unsigned long flags;
 
-	raw_spin_lock_irqsave(&current->pi_lock, flags);
+	raw_spin_lock(&current->pi_lock);
 
 	waiter = rt_mutex_top_waiter(lock);
 
@@ -576,7 +573,7 @@ static void wakeup_next_waiter(struct rt_mutex *lock)
 
 	rt_mutex_set_owner(lock, NULL);
 
-	raw_spin_unlock_irqrestore(&current->pi_lock, flags);
+	raw_spin_unlock(&current->pi_lock);
 
 	rt_mutex_wake_waiter(waiter);
 }
@@ -592,20 +589,19 @@ static void remove_waiter(struct rt_mutex *lock,
 {
 	int first = (waiter == rt_mutex_top_waiter(lock));
 	struct task_struct *owner = rt_mutex_owner(lock);
-	unsigned long flags;
 	int chain_walk = 0;
 
-	raw_spin_lock_irqsave(&current->pi_lock, flags);
+	raw_spin_lock(&current->pi_lock);
 	plist_del(&waiter->list_entry, &lock->wait_list);
 	current->pi_blocked_on = NULL;
-	raw_spin_unlock_irqrestore(&current->pi_lock, flags);
+	raw_spin_unlock(&current->pi_lock);
 
 	if (!owner)
 		return;
 
 	if (first) {
 
-		raw_spin_lock_irqsave(&owner->pi_lock, flags);
+		raw_spin_lock(&owner->pi_lock);
 
 		plist_del(&waiter->pi_list_entry, &owner->pi_waiters);
 
@@ -620,7 +616,7 @@ static void remove_waiter(struct rt_mutex *lock,
 		if (rt_mutex_real_waiter(owner->pi_blocked_on))
 			chain_walk = 1;
 
-		raw_spin_unlock_irqrestore(&owner->pi_lock, flags);
+		raw_spin_unlock(&owner->pi_lock);
 	}
 
 	WARN_ON(!plist_node_empty(&waiter->pi_list_entry));
@@ -631,11 +627,11 @@ static void remove_waiter(struct rt_mutex *lock,
 	/* gets dropped in rt_mutex_adjust_prio_chain()! */
 	get_task_struct(owner);
 
-	raw_spin_unlock(&lock->wait_lock);
+	raw_spin_unlock_irq(&lock->wait_lock);
 
 	rt_mutex_adjust_prio_chain(owner, 0, lock, NULL, current);
 
-	raw_spin_lock(&lock->wait_lock);
+	raw_spin_lock_irq(&lock->wait_lock);
 }
 
 /*
@@ -723,9 +719,6 @@ static int adaptive_wait(struct rt_mutex *lock,
 }
 #endif
 
-# define pi_lock(lock)			raw_spin_lock_irq(lock)
-# define pi_unlock(lock)		raw_spin_unlock_irq(lock)
-
 /*
  * Slow path lock function spin_lock style: this variant is very
  * careful not to miss any non-lock wakeups.
@@ -737,19 +730,22 @@ static void  noinline __sched rt_spin_lock_slowlock(struct rt_mutex *lock)
 {
 	struct task_struct *lock_owner, *self = current;
 	struct rt_mutex_waiter waiter, *top_waiter;
+	unsigned long flags;
 	int ret;
 
 	rt_mutex_init_waiter(&waiter, true);
 
-	raw_spin_lock(&lock->wait_lock);
+	raw_local_save_flags(flags);
+	raw_spin_lock_irq(&lock->wait_lock);
 	init_lists(lock);
 
 	if (__try_to_take_rt_mutex(lock, self, NULL, STEAL_LATERAL)) {
-		raw_spin_unlock(&lock->wait_lock);
+		raw_spin_unlock_irqrestore(&lock->wait_lock, flags);
 		return;
 	}
 
 	BUG_ON(rt_mutex_owner(lock) == self);
+	BUG_ON(arch_irqs_disabled_flags(flags));
 
 	/*
 	 * We save whatever state the task is in and we'll restore it
@@ -757,10 +753,10 @@ static void  noinline __sched rt_spin_lock_slowlock(struct rt_mutex *lock)
 	 * as well. We are serialized via pi_lock against wakeups. See
 	 * try_to_wake_up().
 	 */
-	pi_lock(&self->pi_lock);
+	raw_spin_lock(&self->pi_lock);
 	self->saved_state = self->state;
 	__set_current_state(TASK_UNINTERRUPTIBLE);
-	pi_unlock(&self->pi_lock);
+	raw_spin_unlock(&self->pi_lock);
 
 	ret = task_blocks_on_rt_mutex(lock, &waiter, self, 0);
 	BUG_ON(ret);
@@ -773,18 +769,18 @@ static void  noinline __sched rt_spin_lock_slowlock(struct rt_mutex *lock)
 		top_waiter = rt_mutex_top_waiter(lock);
 		lock_owner = rt_mutex_owner(lock);
 
-		raw_spin_unlock(&lock->wait_lock);
+		raw_spin_unlock_irq(&lock->wait_lock);
 
 		debug_rt_mutex_print_deadlock(&waiter);
 
 		if (top_waiter != &waiter || adaptive_wait(lock, lock_owner))
 			schedule_rt_mutex(lock);
 
-		raw_spin_lock(&lock->wait_lock);
+		raw_spin_lock_irq(&lock->wait_lock);
 
-		pi_lock(&self->pi_lock);
+		raw_spin_lock(&self->pi_lock);
 		__set_current_state(TASK_UNINTERRUPTIBLE);
-		pi_unlock(&self->pi_lock);
+		raw_spin_unlock(&self->pi_lock);
 	}
 
 	/*
@@ -794,10 +790,10 @@ static void  noinline __sched rt_spin_lock_slowlock(struct rt_mutex *lock)
 	 * happened while we were blocked. Clear saved_state so
 	 * try_to_wakeup() does not get confused.
 	 */
-	pi_lock(&self->pi_lock);
+	raw_spin_lock(&self->pi_lock);
 	__set_current_state(self->saved_state);
 	self->saved_state = TASK_RUNNING;
-	pi_unlock(&self->pi_lock);
+	raw_spin_unlock(&self->pi_lock);
 
 	/*
 	 * try_to_take_rt_mutex() sets the waiter bit
@@ -808,7 +804,7 @@ static void  noinline __sched rt_spin_lock_slowlock(struct rt_mutex *lock)
 	BUG_ON(rt_mutex_has_waiters(lock) && &waiter == rt_mutex_top_waiter(lock));
 	BUG_ON(!plist_node_empty(&waiter.list_entry));
 
-	raw_spin_unlock(&lock->wait_lock);
+	raw_spin_unlock_irq(&lock->wait_lock);
 
 	debug_rt_mutex_free_waiter(&waiter);
 }
@@ -818,7 +814,9 @@ static void  noinline __sched rt_spin_lock_slowlock(struct rt_mutex *lock)
  */
 static void  noinline __sched rt_spin_lock_slowunlock(struct rt_mutex *lock)
 {
-	raw_spin_lock(&lock->wait_lock);
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&lock->wait_lock, flags);
 
 	debug_rt_mutex_unlock(lock);
 
@@ -826,13 +824,13 @@ static void  noinline __sched rt_spin_lock_slowunlock(struct rt_mutex *lock)
 
 	if (!rt_mutex_has_waiters(lock)) {
 		lock->owner = NULL;
-		raw_spin_unlock(&lock->wait_lock);
+		raw_spin_unlock_irqrestore(&lock->wait_lock, flags);
 		return;
 	}
 
 	wakeup_next_waiter(lock);
 
-	raw_spin_unlock(&lock->wait_lock);
+	raw_spin_unlock_irqrestore(&lock->wait_lock, flags);
 
 	/* Undo pi boosting.when necessary */
 	rt_mutex_adjust_prio(current);
@@ -1032,13 +1030,13 @@ __rt_mutex_slowlock(struct rt_mutex *lock, int state,
 				break;
 		}
 
-		raw_spin_unlock(&lock->wait_lock);
+		raw_spin_unlock_irq(&lock->wait_lock);
 
 		debug_rt_mutex_print_deadlock(waiter);
 
 		schedule_rt_mutex(lock);
 
-		raw_spin_lock(&lock->wait_lock);
+		raw_spin_lock_irq(&lock->wait_lock);
 		set_current_state(state);
 	}
 
@@ -1130,20 +1128,23 @@ rt_mutex_slowlock(struct rt_mutex *lock, int state,
 		  int detect_deadlock, struct ww_acquire_ctx *ww_ctx)
 {
 	struct rt_mutex_waiter waiter;
+	unsigned long flags;
 	int ret = 0;
 
 	rt_mutex_init_waiter(&waiter, false);
 
-	raw_spin_lock(&lock->wait_lock);
+	raw_local_save_flags(flags);
+	raw_spin_lock_irq(&lock->wait_lock);
 	init_lists(lock);
 
 	/* Try to acquire the lock again: */
 	if (try_to_take_rt_mutex(lock, current, NULL)) {
 		if (ww_ctx)
 			ww_mutex_account_lock(lock, ww_ctx);
-		raw_spin_unlock(&lock->wait_lock);
+		raw_spin_unlock_irqrestore(&lock->wait_lock, flags);
 		return 0;
 	}
+	BUG_ON(arch_irqs_disabled_flags(flags));
 
 	set_current_state(state);
 
@@ -1172,7 +1173,7 @@ rt_mutex_slowlock(struct rt_mutex *lock, int state,
 	 */
 	fixup_rt_mutex_waiters(lock);
 
-	raw_spin_unlock(&lock->wait_lock);
+	raw_spin_unlock_irq(&lock->wait_lock);
 
 	/* Remove pending timer: */
 	if (unlikely(timeout))
@@ -1189,9 +1190,10 @@ rt_mutex_slowlock(struct rt_mutex *lock, int state,
 static inline int
 rt_mutex_slowtrylock(struct rt_mutex *lock)
 {
+	unsigned long flags;
 	int ret = 0;
 
-	raw_spin_lock(&lock->wait_lock);
+	raw_spin_lock_irqsave(&lock->wait_lock, flags);
 	init_lists(lock);
 
 	if (likely(rt_mutex_owner(lock) != current)) {
@@ -1204,7 +1206,7 @@ rt_mutex_slowtrylock(struct rt_mutex *lock)
 		fixup_rt_mutex_waiters(lock);
 	}
 
-	raw_spin_unlock(&lock->wait_lock);
+	raw_spin_unlock_irqrestore(&lock->wait_lock, flags);
 
 	return ret;
 }
@@ -1215,7 +1217,9 @@ rt_mutex_slowtrylock(struct rt_mutex *lock)
 static void __sched
 rt_mutex_slowunlock(struct rt_mutex *lock)
 {
-	raw_spin_lock(&lock->wait_lock);
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&lock->wait_lock, flags);
 
 	debug_rt_mutex_unlock(lock);
 
@@ -1223,13 +1227,13 @@ rt_mutex_slowunlock(struct rt_mutex *lock)
 
 	if (!rt_mutex_has_waiters(lock)) {
 		lock->owner = NULL;
-		raw_spin_unlock(&lock->wait_lock);
+		raw_spin_unlock_irqrestore(&lock->wait_lock, flags);
 		return;
 	}
 
 	wakeup_next_waiter(lock);
 
-	raw_spin_unlock(&lock->wait_lock);
+	raw_spin_unlock_irqrestore(&lock->wait_lock, flags);
 
 	/* Undo pi boosting if necessary: */
 	rt_mutex_adjust_prio(current);
@@ -1489,10 +1493,10 @@ int rt_mutex_start_proxy_lock(struct rt_mutex *lock,
 {
 	int ret;
 
-	raw_spin_lock(&lock->wait_lock);
+	raw_spin_lock_irq(&lock->wait_lock);
 
 	if (try_to_take_rt_mutex(lock, task, NULL)) {
-		raw_spin_unlock(&lock->wait_lock);
+		raw_spin_unlock_irq(&lock->wait_lock);
 		return 1;
 	}
 
@@ -1515,18 +1519,17 @@ int rt_mutex_start_proxy_lock(struct rt_mutex *lock,
 	 * PI_REQUEUE_INPROGRESS, so that if the task is waking up
 	 * it will know that we are in the process of requeuing it.
 	 */
-	raw_spin_lock_irq(&task->pi_lock);
+	raw_spin_lock(&task->pi_lock);
 	if (task->pi_blocked_on) {
-		raw_spin_unlock_irq(&task->pi_lock);
-		raw_spin_unlock(&lock->wait_lock);
+		raw_spin_unlock(&task->pi_lock);
+		raw_spin_unlock_irq(&lock->wait_lock);
 		return -EAGAIN;
 	}
 	task->pi_blocked_on = PI_REQUEUE_INPROGRESS;
-	raw_spin_unlock_irq(&task->pi_lock);
+	raw_spin_unlock(&task->pi_lock);
 #endif
 
 	ret = task_blocks_on_rt_mutex(lock, waiter, task, detect_deadlock);
-
 	if (ret && !rt_mutex_owner(lock)) {
 		/*
 		 * Reset the return value. We might have
@@ -1540,7 +1543,7 @@ int rt_mutex_start_proxy_lock(struct rt_mutex *lock,
 	if (unlikely(ret))
 		remove_waiter(lock, waiter);
 
-	raw_spin_unlock(&lock->wait_lock);
+	raw_spin_unlock_irq(&lock->wait_lock);
 
 	debug_rt_mutex_print_deadlock(waiter);
 
@@ -1590,12 +1593,11 @@ int rt_mutex_finish_proxy_lock(struct rt_mutex *lock,
 {
 	int ret;
 
-	raw_spin_lock(&lock->wait_lock);
+	raw_spin_lock_irq(&lock->wait_lock);
 
 	set_current_state(TASK_INTERRUPTIBLE);
 
 	ret = __rt_mutex_slowlock(lock, TASK_INTERRUPTIBLE, to, waiter, NULL);
-
 	set_current_state(TASK_RUNNING);
 
 	if (unlikely(ret))
@@ -1607,7 +1609,7 @@ int rt_mutex_finish_proxy_lock(struct rt_mutex *lock,
 	 */
 	fixup_rt_mutex_waiters(lock);
 
-	raw_spin_unlock(&lock->wait_lock);
+	raw_spin_unlock_irq(&lock->wait_lock);
 
 	return ret;
 }
diff --git a/localversion-rt b/localversion-rt
index 6f206be..c3054d0 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt1
+-rt2

Re: [ANNOUNCE] 3.12.0-rt2

[Pavel Vasilyev]

[-- Attachment #1: Type: text/plain, Size: 621 bytes --]

16.11.2013 23:46, Sebastian Andrzej Siewior пишет:
> Dear RT folks!
> 
> I'm pleased to announce the v3.12.0-rt2 patch set.

I cat't still to mount filesystems!
bash not start!

1. pull git kernel 3.12
2. wget rt-patch
3. patch'em all
4. make oldconfig && make && make install
5 In cmdline type init=/bin/bash
....
And....  see screenshot:
http://i59.fastpic.ru/big/2013/1117/85/61c0a35e5a456263910ce4cf3152d085.jpg

system not response, SysRQ+B - work


3.2.52-rt72 - work
3.10.18-rt14 - work
3.12-rt2 - NO!





-- 

                                                         Pavel.


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 836 bytes --]

Re: [ANNOUNCE] 3.2.52-rt73

[Pavel Vasilyev]

[-- Attachment #1: Type: text/plain, Size: 1791 bytes --]


Fine, killed 3.12 now decided to finish 3.2.x. Good job guys!

Not configuration, not hardware, not software has not been updated or changed.

BUG: scheduling while atomic: irq/74-sata_nv/57/0x00000002
Modules linked in: cls_u32 sch_sfq sch_htb
Pid: 57, comm: irq/74-sata_nv Tainted: G           O 3.2.52-rt73 #10
Call Trace:
 [<ffffffff814bdef4>] ? __schedule+0x314/0x344
 [<ffffffff81081b77>] ? task_blocks_on_rt_mutex+0x1e7/0x280
 [<ffffffff814be741>] ? schedule+0x21/0xa0
 [<ffffffff814c0d88>] ? rt_spin_lock_slowlock+0x128/0x280
 [<ffffffff81204d01>] ? blk_update_request+0x11/0x450
 [<ffffffff812a6976>] ? add_timer_randomness+0x86/0x1e0
 [<ffffffff81206eac>] ? blk_end_request+0x9c/0xc0
 [<ffffffff812c629a>] ? scsi_io_completion+0x9a/0x770
 [<ffffffff8120d4ab>] ? blk_done_softirq+0x6b/0x80
 [<ffffffff8104a805>] ? __do_softirq_common+0xa5/0x1d0
 [<ffffffff81094ec0>] ? irq_thread_fn+0x50/0x50
 [<ffffffff8104ad77>] ? local_bh_enable+0x127/0x150
 [<ffffffff81094f08>] ? irq_forced_thread_fn+0x48/0x70
 [<ffffffff81094d80>] ? irq_thread+0x150/0x240
 [<ffffffff81094c30>] ? disable_irq_nosync+0x60/0x60
 [<ffffffff81067150>] ? kthread+0x80/0x90
 [<ffffffff814c3174>] ? kernel_thread_helper+0x4/0x10
 [<ffffffff810670d0>] ? kthread_bind+0x80/0x80
 [<ffffffff814c3170>] ? gs_change+0xb/0xb


BUG: scheduling while atomic: ksoftirqd/3/27/0x00000002
Pid: 3, comm: ksoftirqd/0 Tainted: G           O 3.2.52-rt73 #10
...
BUG: scheduling while atomic: ksoftirqd/0/3/0x00000002
Pid: 27, comm: ksoftirqd/3 Tainted: G           O 3.2.52-rt73 #10
....
BUG: scheduling while atomic: ksoftirqd/0/3/0x00000002
Pid: 27, comm: ksoftirqd/3 Tainted: G           O 3.2.52-rt73 #10



-- 

                                                         Pavel.




[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 836 bytes --]

Re: [ANNOUNCE] 3.2.52-rt73

[Sebastian Andrzej Siewior]

* Pavel Vasilyev | 2013-11-22 00:44:37 [+0400]:

>
>Fine, killed 3.12 now decided to finish 3.2.x. Good job guys!
>
>Not configuration, not hardware, not software has not been updated or changed.

No I am a bit confused. On 16th you write:
|3.2.52-rt72 - work

and now you say that we killed v3.2. There was no v3.2.52-rt72 but
v3.2.51-rt72. So did -rt72 work and -rt73 does no more?

I saw your earlier screenshots and there is nothing I can say. I can't
tell based on the screenshot what is wrong. Sorry.

This time you managed to include a backtrace. Better! However would you
mind to enable frame pointers? The backtrace 

>BUG: scheduling while atomic: irq/74-sata_nv/57/0x00000002
>Modules linked in: cls_u32 sch_sfq sch_htb
>Pid: 57, comm: irq/74-sata_nv Tainted: G           O 3.2.52-rt73 #10
>Call Trace:
> [<ffffffff814bdef4>] ? __schedule+0x314/0x344
> [<ffffffff81081b77>] ? task_blocks_on_rt_mutex+0x1e7/0x280
> [<ffffffff814be741>] ? schedule+0x21/0xa0
> [<ffffffff814c0d88>] ? rt_spin_lock_slowlock+0x128/0x280
> [<ffffffff81204d01>] ? blk_update_request+0x11/0x450
> [<ffffffff812a6976>] ? add_timer_randomness+0x86/0x1e0
> [<ffffffff81206eac>] ? blk_end_request+0x9c/0xc0
> [<ffffffff812c629a>] ? scsi_io_completion+0x9a/0x770
> [<ffffffff8120d4ab>] ? blk_done_softirq+0x6b/0x80
> [<ffffffff8104a805>] ? __do_softirq_common+0xa5/0x1d0
> [<ffffffff81094ec0>] ? irq_thread_fn+0x50/0x50
> [<ffffffff8104ad77>] ? local_bh_enable+0x127/0x150
> [<ffffffff81094f08>] ? irq_forced_thread_fn+0x48/0x70
> [<ffffffff81094d80>] ? irq_thread+0x150/0x240
> [<ffffffff81094c30>] ? disable_irq_nosync+0x60/0x60
> [<ffffffff81067150>] ? kthread+0x80/0x90
> [<ffffffff814c3174>] ? kernel_thread_helper+0x4/0x10
> [<ffffffff810670d0>] ? kthread_bind+0x80/0x80
> [<ffffffff814c3170>] ? gs_change+0xb/0xb

shows now random functions which were on stack before the accident. What
happens is that something on the system tries to take a sleeping long
while beeing most likely in a preempt disable region. With lockdep on it
might even throw some additional information here.

Sebastian

[ANNOUNCE] 3.12.1-rt4

[Sebastian Andrzej Siewior]

Dear RT folks!

I'm pleased to announce the v3.12.1-rt4 patch set.

Changes since v3.12.0-rt2
- rtmutex: the patch with the conversion to raw_spinlock_irq() of the
  waiter lock has been replaced by a trylock attempt this keeps the
  change a lot smaller. Initially suggested by Matt Cowell.
  There is also a special unlock function so lockdep does not complain
  on the in unlock path.
- A patch from Peter Zijlstra so lockdep sees the locking problem from
  above.
- migrate_disable() does not invoke preempt_enable() +
  preempt_disable() on recursion. An optimisation by Nicholas Mc Guire.
- rt_mutex_trylock() does not invoke migrate_disable() +
  migrate_enable() in the case where it did not get the lock. An
  optimisation by Nicholas Mc Guire.

Known issues:

      - bcache is disabled.

      - an ancient race (since we got sleeping spinlocks) where the
        TASK_TRACED state is temporary replaced while waiting on a rw
        lock and the task can't be traced.

The delta patch against v3.12.1-rt3 is appended below and can be found
here:
   https://www.kernel.org/pub/linux/kernel/projects/rt/3.12/incr/patch-3.12.1-rt3-rt4.patch.xz

The RT patch against 3.12.1 can be found here:

   https://www.kernel.org/pub/linux/kernel/projects/rt/3.12/patch-3.12.1-rt4.patch.xz

The split quilt queue is available at:

   https://www.kernel.org/pub/linux/kernel/projects/rt/3.12/patches-3.12.1-rt4.tar.xz

Sebastian

diff --git a/include/linux/spinlock_rt.h b/include/linux/spinlock_rt.h
index 0618387..b3c504b 100644
--- a/include/linux/spinlock_rt.h
+++ b/include/linux/spinlock_rt.h
@@ -22,6 +22,7 @@ extern void __lockfunc rt_spin_lock(spinlock_t *lock);
 extern unsigned long __lockfunc rt_spin_lock_trace_flags(spinlock_t *lock);
 extern void __lockfunc rt_spin_lock_nested(spinlock_t *lock, int subclass);
 extern void __lockfunc rt_spin_unlock(spinlock_t *lock);
+extern void __lockfunc rt_spin_unlock_after_trylock_in_irq(spinlock_t *lock);
 extern void __lockfunc rt_spin_unlock_wait(spinlock_t *lock);
 extern int __lockfunc rt_spin_trylock_irqsave(spinlock_t *lock, unsigned long *flags);
 extern int __lockfunc rt_spin_trylock_bh(spinlock_t *lock);
diff --git a/kernel/futex.c b/kernel/futex.c
index 404d0bd..0ef419d 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -891,7 +891,7 @@ static int wake_futex_pi(u32 __user *uaddr, u32 uval, struct futex_q *this)
 	if (pi_state->owner != current)
 		return -EINVAL;
 
-	raw_spin_lock_irq(&pi_state->pi_mutex.wait_lock);
+	raw_spin_lock(&pi_state->pi_mutex.wait_lock);
 	new_owner = rt_mutex_next_owner(&pi_state->pi_mutex);
 
 	/*
@@ -917,21 +917,21 @@ static int wake_futex_pi(u32 __user *uaddr, u32 uval, struct futex_q *this)
 		else if (curval != uval)
 			ret = -EINVAL;
 		if (ret) {
-			raw_spin_unlock_irq(&pi_state->pi_mutex.wait_lock);
+			raw_spin_unlock(&pi_state->pi_mutex.wait_lock);
 			return ret;
 		}
 	}
 
-	raw_spin_lock(&pi_state->owner->pi_lock);
+	raw_spin_lock_irq(&pi_state->owner->pi_lock);
 	WARN_ON(list_empty(&pi_state->list));
 	list_del_init(&pi_state->list);
-	raw_spin_unlock(&pi_state->owner->pi_lock);
+	raw_spin_unlock_irq(&pi_state->owner->pi_lock);
 
-	raw_spin_lock(&new_owner->pi_lock);
+	raw_spin_lock_irq(&new_owner->pi_lock);
 	WARN_ON(!list_empty(&pi_state->list));
 	list_add(&pi_state->list, &new_owner->pi_state_list);
 	pi_state->owner = new_owner;
-	raw_spin_unlock(&new_owner->pi_lock);
+	raw_spin_unlock_irq(&new_owner->pi_lock);
 
 	raw_spin_unlock(&pi_state->pi_mutex.wait_lock);
 	rt_mutex_unlock(&pi_state->pi_mutex);
@@ -1762,11 +1762,11 @@ static int fixup_owner(u32 __user *uaddr, struct futex_q *q, int locked)
 		 * we returned due to timeout or signal without taking the
 		 * rt_mutex. Too late.
 		 */
-		raw_spin_lock_irq(&q->pi_state->pi_mutex.wait_lock);
+		raw_spin_lock(&q->pi_state->pi_mutex.wait_lock);
 		owner = rt_mutex_owner(&q->pi_state->pi_mutex);
 		if (!owner)
 			owner = rt_mutex_next_owner(&q->pi_state->pi_mutex);
-		raw_spin_unlock_irq(&q->pi_state->pi_mutex.wait_lock);
+		raw_spin_unlock(&q->pi_state->pi_mutex.wait_lock);
 		ret = fixup_pi_state_owner(uaddr, q, owner);
 		goto out;
 	}
diff --git a/kernel/rt.c b/kernel/rt.c
index 433ae42..4b2c4a9 100644
--- a/kernel/rt.c
+++ b/kernel/rt.c
@@ -182,11 +182,10 @@ int __lockfunc rt_write_trylock(rwlock_t *rwlock)
 {
 	int ret = rt_mutex_trylock(&rwlock->lock);
 
-	migrate_disable();
-	if (ret)
+	if (ret) {
 		rwlock_acquire(&rwlock->dep_map, 0, 1, _RET_IP_);
-	else
-		migrate_enable();
+		migrate_disable();
+	}
 
 	return ret;
 }
diff --git a/kernel/rtmutex.c b/kernel/rtmutex.c
index c2f3f63..4e9691f 100644
--- a/kernel/rtmutex.c
+++ b/kernel/rtmutex.c
@@ -298,7 +298,7 @@ static int rt_mutex_adjust_prio_chain(struct task_struct *task,
 	plist_add(&waiter->list_entry, &lock->wait_list);
 
 	/* Release the task */
-	raw_spin_unlock(&task->pi_lock);
+	raw_spin_unlock_irqrestore(&task->pi_lock, flags);
 	if (!rt_mutex_owner(lock)) {
 		struct rt_mutex_waiter *lock_top_waiter;
 
@@ -309,7 +309,7 @@ static int rt_mutex_adjust_prio_chain(struct task_struct *task,
 		lock_top_waiter = rt_mutex_top_waiter(lock);
 		if (top_waiter != lock_top_waiter)
 			rt_mutex_wake_waiter(lock_top_waiter);
-		raw_spin_unlock_irqrestore(&lock->wait_lock, flags);
+		raw_spin_unlock(&lock->wait_lock);
 		goto out_put_task;
 	}
 	put_task_struct(task);
@@ -317,7 +317,7 @@ static int rt_mutex_adjust_prio_chain(struct task_struct *task,
 	/* Grab the next task */
 	task = rt_mutex_owner(lock);
 	get_task_struct(task);
-	raw_spin_lock(&task->pi_lock);
+	raw_spin_lock_irqsave(&task->pi_lock, flags);
 
 	if (waiter == rt_mutex_top_waiter(lock)) {
 		/* Boost the owner */
@@ -335,10 +335,10 @@ static int rt_mutex_adjust_prio_chain(struct task_struct *task,
 		__rt_mutex_adjust_prio(task);
 	}
 
-	raw_spin_unlock(&task->pi_lock);
+	raw_spin_unlock_irqrestore(&task->pi_lock, flags);
 
 	top_waiter = rt_mutex_top_waiter(lock);
-	raw_spin_unlock_irqrestore(&lock->wait_lock, flags);
+	raw_spin_unlock(&lock->wait_lock);
 
 	if (!detect_deadlock && waiter != top_waiter)
 		goto out_put_task;
@@ -425,9 +425,10 @@ __try_to_take_rt_mutex(struct rt_mutex *lock, struct task_struct *task,
 	/* We got the lock. */
 
 	if (waiter || rt_mutex_has_waiters(lock)) {
+		unsigned long flags;
 		struct rt_mutex_waiter *top;
 
-		raw_spin_lock(&task->pi_lock);
+		raw_spin_lock_irqsave(&task->pi_lock, flags);
 
 		/* remove the queued waiter. */
 		if (waiter) {
@@ -444,7 +445,7 @@ __try_to_take_rt_mutex(struct rt_mutex *lock, struct task_struct *task,
 			top->pi_list_entry.prio = top->list_entry.prio;
 			plist_add(&top->pi_list_entry, &task->pi_waiters);
 		}
-		raw_spin_unlock(&task->pi_lock);
+		raw_spin_unlock_irqrestore(&task->pi_lock, flags);
 	}
 
 	debug_rt_mutex_lock(lock);
@@ -477,9 +478,10 @@ static int task_blocks_on_rt_mutex(struct rt_mutex *lock,
 {
 	struct task_struct *owner = rt_mutex_owner(lock);
 	struct rt_mutex_waiter *top_waiter = waiter;
+	unsigned long flags;
 	int chain_walk = 0, res;
 
-	raw_spin_lock(&task->pi_lock);
+	raw_spin_lock_irqsave(&task->pi_lock, flags);
 
 	/*
 	 * In the case of futex requeue PI, this will be a proxy
@@ -491,7 +493,7 @@ static int task_blocks_on_rt_mutex(struct rt_mutex *lock,
 	 * the task if PI_WAKEUP_INPROGRESS is set.
 	 */
 	if (task != current && task->pi_blocked_on == PI_WAKEUP_INPROGRESS) {
-		raw_spin_unlock(&task->pi_lock);
+		raw_spin_unlock_irqrestore(&task->pi_lock, flags);
 		return -EAGAIN;
 	}
 
@@ -510,20 +512,20 @@ static int task_blocks_on_rt_mutex(struct rt_mutex *lock,
 
 	task->pi_blocked_on = waiter;
 
-	raw_spin_unlock(&task->pi_lock);
+	raw_spin_unlock_irqrestore(&task->pi_lock, flags);
 
 	if (!owner)
 		return 0;
 
 	if (waiter == rt_mutex_top_waiter(lock)) {
-		raw_spin_lock(&owner->pi_lock);
+		raw_spin_lock_irqsave(&owner->pi_lock, flags);
 		plist_del(&top_waiter->pi_list_entry, &owner->pi_waiters);
 		plist_add(&waiter->pi_list_entry, &owner->pi_waiters);
 
 		__rt_mutex_adjust_prio(owner);
 		if (rt_mutex_real_waiter(owner->pi_blocked_on))
 			chain_walk = 1;
-		raw_spin_unlock(&owner->pi_lock);
+		raw_spin_unlock_irqrestore(&owner->pi_lock, flags);
 	}
 	else if (debug_rt_mutex_detect_deadlock(waiter, detect_deadlock))
 		chain_walk = 1;
@@ -538,12 +540,12 @@ static int task_blocks_on_rt_mutex(struct rt_mutex *lock,
 	 */
 	get_task_struct(owner);
 
-	raw_spin_unlock_irq(&lock->wait_lock);
+	raw_spin_unlock(&lock->wait_lock);
 
 	res = rt_mutex_adjust_prio_chain(owner, detect_deadlock, lock, waiter,
 					 task);
 
-	raw_spin_lock_irq(&lock->wait_lock);
+	raw_spin_lock(&lock->wait_lock);
 
 	return res;
 }
@@ -558,8 +560,9 @@ static int task_blocks_on_rt_mutex(struct rt_mutex *lock,
 static void wakeup_next_waiter(struct rt_mutex *lock)
 {
 	struct rt_mutex_waiter *waiter;
+	unsigned long flags;
 
-	raw_spin_lock(&current->pi_lock);
+	raw_spin_lock_irqsave(&current->pi_lock, flags);
 
 	waiter = rt_mutex_top_waiter(lock);
 
@@ -573,7 +576,7 @@ static void wakeup_next_waiter(struct rt_mutex *lock)
 
 	rt_mutex_set_owner(lock, NULL);
 
-	raw_spin_unlock(&current->pi_lock);
+	raw_spin_unlock_irqrestore(&current->pi_lock, flags);
 
 	rt_mutex_wake_waiter(waiter);
 }
@@ -589,19 +592,20 @@ static void remove_waiter(struct rt_mutex *lock,
 {
 	int first = (waiter == rt_mutex_top_waiter(lock));
 	struct task_struct *owner = rt_mutex_owner(lock);
+	unsigned long flags;
 	int chain_walk = 0;
 
-	raw_spin_lock(&current->pi_lock);
+	raw_spin_lock_irqsave(&current->pi_lock, flags);
 	plist_del(&waiter->list_entry, &lock->wait_list);
 	current->pi_blocked_on = NULL;
-	raw_spin_unlock(&current->pi_lock);
+	raw_spin_unlock_irqrestore(&current->pi_lock, flags);
 
 	if (!owner)
 		return;
 
 	if (first) {
 
-		raw_spin_lock(&owner->pi_lock);
+		raw_spin_lock_irqsave(&owner->pi_lock, flags);
 
 		plist_del(&waiter->pi_list_entry, &owner->pi_waiters);
 
@@ -616,7 +620,7 @@ static void remove_waiter(struct rt_mutex *lock,
 		if (rt_mutex_real_waiter(owner->pi_blocked_on))
 			chain_walk = 1;
 
-		raw_spin_unlock(&owner->pi_lock);
+		raw_spin_unlock_irqrestore(&owner->pi_lock, flags);
 	}
 
 	WARN_ON(!plist_node_empty(&waiter->pi_list_entry));
@@ -627,11 +631,11 @@ static void remove_waiter(struct rt_mutex *lock,
 	/* gets dropped in rt_mutex_adjust_prio_chain()! */
 	get_task_struct(owner);
 
-	raw_spin_unlock_irq(&lock->wait_lock);
+	raw_spin_unlock(&lock->wait_lock);
 
 	rt_mutex_adjust_prio_chain(owner, 0, lock, NULL, current);
 
-	raw_spin_lock_irq(&lock->wait_lock);
+	raw_spin_lock(&lock->wait_lock);
 }
 
 /*
@@ -719,6 +723,9 @@ static int adaptive_wait(struct rt_mutex *lock,
 }
 #endif
 
+# define pi_lock(lock)			raw_spin_lock_irq(lock)
+# define pi_unlock(lock)		raw_spin_unlock_irq(lock)
+
 /*
  * Slow path lock function spin_lock style: this variant is very
  * careful not to miss any non-lock wakeups.
@@ -730,22 +737,19 @@ static void  noinline __sched rt_spin_lock_slowlock(struct rt_mutex *lock)
 {
 	struct task_struct *lock_owner, *self = current;
 	struct rt_mutex_waiter waiter, *top_waiter;
-	unsigned long flags;
 	int ret;
 
 	rt_mutex_init_waiter(&waiter, true);
 
-	raw_local_save_flags(flags);
-	raw_spin_lock_irq(&lock->wait_lock);
+	raw_spin_lock(&lock->wait_lock);
 	init_lists(lock);
 
 	if (__try_to_take_rt_mutex(lock, self, NULL, STEAL_LATERAL)) {
-		raw_spin_unlock_irqrestore(&lock->wait_lock, flags);
+		raw_spin_unlock(&lock->wait_lock);
 		return;
 	}
 
 	BUG_ON(rt_mutex_owner(lock) == self);
-	BUG_ON(arch_irqs_disabled_flags(flags));
 
 	/*
 	 * We save whatever state the task is in and we'll restore it
@@ -753,10 +757,10 @@ static void  noinline __sched rt_spin_lock_slowlock(struct rt_mutex *lock)
 	 * as well. We are serialized via pi_lock against wakeups. See
 	 * try_to_wake_up().
 	 */
-	raw_spin_lock(&self->pi_lock);
+	pi_lock(&self->pi_lock);
 	self->saved_state = self->state;
 	__set_current_state(TASK_UNINTERRUPTIBLE);
-	raw_spin_unlock(&self->pi_lock);
+	pi_unlock(&self->pi_lock);
 
 	ret = task_blocks_on_rt_mutex(lock, &waiter, self, 0);
 	BUG_ON(ret);
@@ -769,18 +773,18 @@ static void  noinline __sched rt_spin_lock_slowlock(struct rt_mutex *lock)
 		top_waiter = rt_mutex_top_waiter(lock);
 		lock_owner = rt_mutex_owner(lock);
 
-		raw_spin_unlock_irq(&lock->wait_lock);
+		raw_spin_unlock(&lock->wait_lock);
 
 		debug_rt_mutex_print_deadlock(&waiter);
 
 		if (top_waiter != &waiter || adaptive_wait(lock, lock_owner))
 			schedule_rt_mutex(lock);
 
-		raw_spin_lock_irq(&lock->wait_lock);
+		raw_spin_lock(&lock->wait_lock);
 
-		raw_spin_lock(&self->pi_lock);
+		pi_lock(&self->pi_lock);
 		__set_current_state(TASK_UNINTERRUPTIBLE);
-		raw_spin_unlock(&self->pi_lock);
+		pi_unlock(&self->pi_lock);
 	}
 
 	/*
@@ -790,10 +794,10 @@ static void  noinline __sched rt_spin_lock_slowlock(struct rt_mutex *lock)
 	 * happened while we were blocked. Clear saved_state so
 	 * try_to_wakeup() does not get confused.
 	 */
-	raw_spin_lock(&self->pi_lock);
+	pi_lock(&self->pi_lock);
 	__set_current_state(self->saved_state);
 	self->saved_state = TASK_RUNNING;
-	raw_spin_unlock(&self->pi_lock);
+	pi_unlock(&self->pi_lock);
 
 	/*
 	 * try_to_take_rt_mutex() sets the waiter bit
@@ -804,7 +808,7 @@ static void  noinline __sched rt_spin_lock_slowlock(struct rt_mutex *lock)
 	BUG_ON(rt_mutex_has_waiters(lock) && &waiter == rt_mutex_top_waiter(lock));
 	BUG_ON(!plist_node_empty(&waiter.list_entry));
 
-	raw_spin_unlock_irq(&lock->wait_lock);
+	raw_spin_unlock(&lock->wait_lock);
 
 	debug_rt_mutex_free_waiter(&waiter);
 }
@@ -812,30 +816,43 @@ static void  noinline __sched rt_spin_lock_slowlock(struct rt_mutex *lock)
 /*
  * Slow path to release a rt_mutex spin_lock style
  */
-static void  noinline __sched rt_spin_lock_slowunlock(struct rt_mutex *lock)
+static void __sched __rt_spin_lock_slowunlock(struct rt_mutex *lock)
 {
-	unsigned long flags;
-
-	raw_spin_lock_irqsave(&lock->wait_lock, flags);
-
 	debug_rt_mutex_unlock(lock);
 
 	rt_mutex_deadlock_account_unlock(current);
 
 	if (!rt_mutex_has_waiters(lock)) {
 		lock->owner = NULL;
-		raw_spin_unlock_irqrestore(&lock->wait_lock, flags);
+		raw_spin_unlock(&lock->wait_lock);
 		return;
 	}
 
 	wakeup_next_waiter(lock);
 
-	raw_spin_unlock_irqrestore(&lock->wait_lock, flags);
+	raw_spin_unlock(&lock->wait_lock);
 
 	/* Undo pi boosting.when necessary */
 	rt_mutex_adjust_prio(current);
 }
 
+static void  noinline __sched rt_spin_lock_slowunlock(struct rt_mutex *lock)
+{
+	raw_spin_lock(&lock->wait_lock);
+	__rt_spin_lock_slowunlock(lock);
+}
+
+static void  noinline __sched rt_spin_lock_slowunlock_hirq(struct rt_mutex *lock)
+{
+	int ret;
+
+	do {
+		ret = raw_spin_trylock(&lock->wait_lock);
+	} while (!ret);
+
+	__rt_spin_lock_slowunlock(lock);
+}
+
 void __lockfunc rt_spin_lock(spinlock_t *lock)
 {
 	rt_spin_lock_fastlock(&lock->lock, rt_spin_lock_slowlock);
@@ -866,6 +883,13 @@ void __lockfunc rt_spin_unlock(spinlock_t *lock)
 }
 EXPORT_SYMBOL(rt_spin_unlock);
 
+void __lockfunc rt_spin_unlock_after_trylock_in_irq(spinlock_t *lock)
+{
+	/* NOTE: we always pass in '1' for nested, for simplicity */
+	spin_release(&lock->dep_map, 1, _RET_IP_);
+	rt_spin_lock_fastunlock(&lock->lock, rt_spin_lock_slowunlock_hirq);
+}
+
 void __lockfunc __rt_spin_unlock(struct rt_mutex *lock)
 {
 	rt_spin_lock_fastunlock(lock, rt_spin_lock_slowunlock);
@@ -1030,13 +1054,13 @@ __rt_mutex_slowlock(struct rt_mutex *lock, int state,
 				break;
 		}
 
-		raw_spin_unlock_irq(&lock->wait_lock);
+		raw_spin_unlock(&lock->wait_lock);
 
 		debug_rt_mutex_print_deadlock(waiter);
 
 		schedule_rt_mutex(lock);
 
-		raw_spin_lock_irq(&lock->wait_lock);
+		raw_spin_lock(&lock->wait_lock);
 		set_current_state(state);
 	}
 
@@ -1128,23 +1152,20 @@ rt_mutex_slowlock(struct rt_mutex *lock, int state,
 		  int detect_deadlock, struct ww_acquire_ctx *ww_ctx)
 {
 	struct rt_mutex_waiter waiter;
-	unsigned long flags;
 	int ret = 0;
 
 	rt_mutex_init_waiter(&waiter, false);
 
-	raw_local_save_flags(flags);
-	raw_spin_lock_irq(&lock->wait_lock);
+	raw_spin_lock(&lock->wait_lock);
 	init_lists(lock);
 
 	/* Try to acquire the lock again: */
 	if (try_to_take_rt_mutex(lock, current, NULL)) {
 		if (ww_ctx)
 			ww_mutex_account_lock(lock, ww_ctx);
-		raw_spin_unlock_irqrestore(&lock->wait_lock, flags);
+		raw_spin_unlock(&lock->wait_lock);
 		return 0;
 	}
-	BUG_ON(arch_irqs_disabled_flags(flags));
 
 	set_current_state(state);
 
@@ -1173,7 +1194,7 @@ rt_mutex_slowlock(struct rt_mutex *lock, int state,
 	 */
 	fixup_rt_mutex_waiters(lock);
 
-	raw_spin_unlock_irq(&lock->wait_lock);
+	raw_spin_unlock(&lock->wait_lock);
 
 	/* Remove pending timer: */
 	if (unlikely(timeout))
@@ -1190,10 +1211,10 @@ rt_mutex_slowlock(struct rt_mutex *lock, int state,
 static inline int
 rt_mutex_slowtrylock(struct rt_mutex *lock)
 {
-	unsigned long flags;
 	int ret = 0;
 
-	raw_spin_lock_irqsave(&lock->wait_lock, flags);
+	if (!raw_spin_trylock(&lock->wait_lock))
+		return ret;
 	init_lists(lock);
 
 	if (likely(rt_mutex_owner(lock) != current)) {
@@ -1206,7 +1227,7 @@ rt_mutex_slowtrylock(struct rt_mutex *lock)
 		fixup_rt_mutex_waiters(lock);
 	}
 
-	raw_spin_unlock_irqrestore(&lock->wait_lock, flags);
+	raw_spin_unlock(&lock->wait_lock);
 
 	return ret;
 }
@@ -1217,9 +1238,7 @@ rt_mutex_slowtrylock(struct rt_mutex *lock)
 static void __sched
 rt_mutex_slowunlock(struct rt_mutex *lock)
 {
-	unsigned long flags;
-
-	raw_spin_lock_irqsave(&lock->wait_lock, flags);
+	raw_spin_lock(&lock->wait_lock);
 
 	debug_rt_mutex_unlock(lock);
 
@@ -1227,13 +1246,13 @@ rt_mutex_slowunlock(struct rt_mutex *lock)
 
 	if (!rt_mutex_has_waiters(lock)) {
 		lock->owner = NULL;
-		raw_spin_unlock_irqrestore(&lock->wait_lock, flags);
+		raw_spin_unlock(&lock->wait_lock);
 		return;
 	}
 
 	wakeup_next_waiter(lock);
 
-	raw_spin_unlock_irqrestore(&lock->wait_lock, flags);
+	raw_spin_unlock(&lock->wait_lock);
 
 	/* Undo pi boosting if necessary: */
 	rt_mutex_adjust_prio(current);
@@ -1493,10 +1512,10 @@ int rt_mutex_start_proxy_lock(struct rt_mutex *lock,
 {
 	int ret;
 
-	raw_spin_lock_irq(&lock->wait_lock);
+	raw_spin_lock(&lock->wait_lock);
 
 	if (try_to_take_rt_mutex(lock, task, NULL)) {
-		raw_spin_unlock_irq(&lock->wait_lock);
+		raw_spin_unlock(&lock->wait_lock);
 		return 1;
 	}
 
@@ -1519,17 +1538,18 @@ int rt_mutex_start_proxy_lock(struct rt_mutex *lock,
 	 * PI_REQUEUE_INPROGRESS, so that if the task is waking up
 	 * it will know that we are in the process of requeuing it.
 	 */
-	raw_spin_lock(&task->pi_lock);
+	raw_spin_lock_irq(&task->pi_lock);
 	if (task->pi_blocked_on) {
-		raw_spin_unlock(&task->pi_lock);
-		raw_spin_unlock_irq(&lock->wait_lock);
+		raw_spin_unlock_irq(&task->pi_lock);
+		raw_spin_unlock(&lock->wait_lock);
 		return -EAGAIN;
 	}
 	task->pi_blocked_on = PI_REQUEUE_INPROGRESS;
-	raw_spin_unlock(&task->pi_lock);
+	raw_spin_unlock_irq(&task->pi_lock);
 #endif
 
 	ret = task_blocks_on_rt_mutex(lock, waiter, task, detect_deadlock);
+
 	if (ret && !rt_mutex_owner(lock)) {
 		/*
 		 * Reset the return value. We might have
@@ -1543,7 +1563,7 @@ int rt_mutex_start_proxy_lock(struct rt_mutex *lock,
 	if (unlikely(ret))
 		remove_waiter(lock, waiter);
 
-	raw_spin_unlock_irq(&lock->wait_lock);
+	raw_spin_unlock(&lock->wait_lock);
 
 	debug_rt_mutex_print_deadlock(waiter);
 
@@ -1593,11 +1613,12 @@ int rt_mutex_finish_proxy_lock(struct rt_mutex *lock,
 {
 	int ret;
 
-	raw_spin_lock_irq(&lock->wait_lock);
+	raw_spin_lock(&lock->wait_lock);
 
 	set_current_state(TASK_INTERRUPTIBLE);
 
 	ret = __rt_mutex_slowlock(lock, TASK_INTERRUPTIBLE, to, waiter, NULL);
+
 	set_current_state(TASK_RUNNING);
 
 	if (unlikely(ret))
@@ -1609,7 +1630,7 @@ int rt_mutex_finish_proxy_lock(struct rt_mutex *lock,
 	 */
 	fixup_rt_mutex_waiters(lock);
 
-	raw_spin_unlock_irq(&lock->wait_lock);
+	raw_spin_unlock(&lock->wait_lock);
 
 	return ret;
 }
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index a7fafc28..22fa2e2 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -2418,13 +2418,12 @@ void migrate_disable(void)
 	}
 #endif
 
-	preempt_disable();
 	if (p->migrate_disable) {
 		p->migrate_disable++;
-		preempt_enable();
 		return;
 	}
 
+	preempt_disable();
 	preempt_lazy_disable();
 	pin_current_cpu();
 	p->migrate_disable = 1;
@@ -2454,13 +2453,12 @@ void migrate_enable(void)
 #endif
 	WARN_ON_ONCE(p->migrate_disable <= 0);
 
-	preempt_disable();
 	if (migrate_disable_count(p) > 1) {
 		p->migrate_disable--;
-		preempt_enable();
 		return;
 	}
 
+	preempt_disable();
 	if (unlikely(migrate_disabled_updated(p))) {
 		/*
 		 * Undo whatever update_migrate_disable() did, also see there
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 6c99698..9a7268f 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -354,13 +354,51 @@ EXPORT_SYMBOL(local_bh_enable_ip);
 #define MAX_SOFTIRQ_TIME  msecs_to_jiffies(2)
 #define MAX_SOFTIRQ_RESTART 10
 
+#ifdef CONFIG_TRACE_IRQFLAGS
+/*
+ * Convoluted means of passing __do_softirq() a message through the various
+ * architecture execute_on_stack() bits.
+ *
+ * When we run softirqs from irq_exit() and thus on the hardirq stack we need
+ * to keep the lockdep irq context tracking as tight as possible in order to
+ * not miss-qualify lock contexts and miss possible deadlocks.
+ */
+static DEFINE_PER_CPU(int, softirq_from_hardirq);
+
+static inline void lockdep_softirq_from_hardirq(void)
+{
+	this_cpu_write(softirq_from_hardirq, 1);
+}
+
+static inline void lockdep_softirq_start(void)
+{
+	if (this_cpu_read(softirq_from_hardirq))
+		trace_hardirq_exit();
+	lockdep_softirq_enter();
+}
+
+static inline void lockdep_softirq_end(void)
+{
+	lockdep_softirq_exit();
+	if (this_cpu_read(softirq_from_hardirq)) {
+		this_cpu_write(softirq_from_hardirq, 0);
+		trace_hardirq_enter();
+	}
+}
+
+#else
+static inline void lockdep_softirq_from_hardirq(void) { }
+static inline void lockdep_softirq_start(void) { }
+static inline void lockdep_softirq_end(void) { }
+#endif
+
 asmlinkage void __do_softirq(void)
 {
-	__u32 pending;
 	unsigned long end = jiffies + MAX_SOFTIRQ_TIME;
-	int cpu;
 	unsigned long old_flags = current->flags;
 	int max_restart = MAX_SOFTIRQ_RESTART;
+	__u32 pending;
+	int cpu;
 
 	/*
 	 * Mask out PF_MEMALLOC s current task context is borrowed for the
@@ -373,7 +411,7 @@ asmlinkage void __do_softirq(void)
 	account_irq_enter_time(current);
 
 	__local_bh_disable(_RET_IP_, SOFTIRQ_OFFSET);
-	lockdep_softirq_enter();
+	lockdep_softirq_start();
 
 	cpu = smp_processor_id();
 restart:
@@ -391,8 +429,7 @@ asmlinkage void __do_softirq(void)
 		wakeup_softirqd();
 	}
 
-	lockdep_softirq_exit();
-
+	lockdep_softirq_end();
 	account_irq_exit_time(current);
 	__local_bh_enable(SOFTIRQ_OFFSET);
 	tsk_restore_flags(current, old_flags, PF_MEMALLOC);
@@ -698,6 +735,7 @@ static inline void invoke_softirq(void)
 {
 #ifndef CONFIG_PREEMPT_RT_FULL
 	if (!force_irqthreads) {
+		lockdep_softirq_from_hardirq();
 		/*
 		 * We can safely execute softirq on the current stack if
 		 * it is the irq stack, because it should be near empty
@@ -746,13 +784,13 @@ void irq_exit(void)
 #endif
 
 	account_irq_exit_time(current);
-	trace_hardirq_exit();
 	sub_preempt_count(HARDIRQ_OFFSET);
 	if (!in_interrupt() && local_softirq_pending())
 		invoke_softirq();
 
 	tick_irq_exit();
 	rcu_irq_exit();
+	trace_hardirq_exit(); /* must be last! */
 }
 
 void raise_softirq(unsigned int nr)
diff --git a/kernel/timer.c b/kernel/timer.c
index fa4a92a..b06c647 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -1400,7 +1400,7 @@ unsigned long get_next_timer_interrupt(unsigned long now)
 		expires = base->next_timer;
 	}
 #ifdef CONFIG_PREEMPT_RT_FULL
-	rt_spin_unlock(&base->lock);
+	rt_spin_unlock_after_trylock_in_irq(&base->lock);
 #else
 	spin_unlock(&base->lock);
 #endif
diff --git a/localversion-rt b/localversion-rt
index 1445cd6..ad3da1b 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt3
+-rt4

Re: [ANNOUNCE] 3.12.1-rt4

[Pavel Vasilyev]

------------[ cut here ]------------
WARNING: CPU: 1 PID: 10 at kernel/time/tick-sched.c:191 0xffffffff8107bac6()
NO_HZ FULL will not work with unstable sched clock
Modules linked in:
CPU: 1 PID: 10 Comm: rcuop/0 Not tainted 3.12.2-rt4 #3
Hardware name: TYAN Computer Corp. S2895/S2895, BIOS 2004Q3 11/18/2008
 0000000000000009 ffff88027fc83ea8 ffffffff81501a58 0000000000000039
 ffff88027fc83ef8 ffff88027fc83ee8 ffffffff8102f992 0000000000012700
ata3.00: configured for UDMA/100
 ffff88027fc8d580 0000000000000001 ffff880272894020 ffff88027fc0d700
Call Trace:
 <IRQ>  [<ffffffff81501a58>] 0xffffffff81501a58
 [<ffffffff8102f992>] 0xffffffff8102f992
 [<ffffffff8102fa61>] 0xffffffff8102fa61
 [<ffffffff8107bac6>] 0xffffffff8107bac6
 [<ffffffff8107c8f4>] 0xffffffff8107c8f4
 [<ffffffff8103405d>] 0xffffffff8103405d
 [<ffffffff81006fff>] 0xffffffff81006fff
 [<ffffffff815085f7>] 0xffffffff815085f7
 <EOI>  [<ffffffff81007083>] ? 0xffffffff81007083
 [<ffffffff81506865>] ? 0xffffffff81506865
 [<ffffffff81095961>] ? 0xffffffff81095961
 [<ffffffff81095860>] ? 0xffffffff81095860
 [<ffffffff8104d0dd>] 0xffffffff8104d0dd
 [<ffffffff8104d030>] ? 0xffffffff8104d030
 [<ffffffff8150763c>] 0xffffffff8150763c
 [<ffffffff8104d030>] ? 0xffffffff8104d030
---[ end trace 53ca152639ff2a59 ]---

Re: [ANNOUNCE] 3.12.1-rt4

[Sebastian Andrzej Siewior]

On 12/01/2013 11:25 PM, Pavel Vasilyev wrote:
> ------------[ cut here ]------------
> WARNING: CPU: 1 PID: 10 at kernel/time/tick-sched.c:191 0xffffffff8107bac6()
> NO_HZ FULL will not work with unstable sched clock
> Call Trace:
>  <IRQ>  [<ffffffff81501a58>] 0xffffffff81501a58
>  [<ffffffff8102f992>] 0xffffffff8102f992

Okay. Now we have a backstrace. Better. Now there is an option named
CONFIG_DEBUG_INFO which resolves a number like 0xffffffff81501a58 to
the function name. Without it enabled, the backtrace is of no use to me.

However, in this case you triggered the warning in tick-sched.c. The
good news is that FULL-NO-HZ mode is not available because your TSC is
unstable and this is all the backtrace is about so it is harmless. You
should see it even without -RT enabled. The bad news is that I don't
think that this has anything to do with your SATA problem.

Sebastian

[ANNOUNCE] 3.2.52-rt73

[Steven Rostedt]

Dear RT Folks,

I'm pleased to announce the 3.2.52-rt73 stable release.


This release is just an update to the new stable 3.2.52 version
and no RT specific changes have been made.


You can get this release via the git tree at:

  git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-stable-rt.git

  branch: v3.2-rt
  Head SHA1: 8f50d792dcaf70f762c271a9722a83704abf3e0f


Or to build 3.2.52-rt73 directly, the following patches should be applied:

  http://www.kernel.org/pub/linux/kernel/v3.x/linux-3.2.tar.xz

  http://www.kernel.org/pub/linux/kernel/v3.x/patch-3.2.52.xz

  http://www.kernel.org/pub/linux/kernel/projects/rt/3.2/patch-3.2.52-rt73.patch.xz




Enjoy,

-- Steve