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Date: Thu, 15 Sep 2011 01:30:24 +0200 (CEST)
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
cc: linux-rt-users <linux-rt-users@...r.kernel.org>
Subject: [ANNOUNCE] 3.0.4-rt14
Dear RT Folks,
I'm pleased to announce the 3.0.4-rt14 release.
Changes versus 3.0.4-rt13
* Cherrypicks from the going to be 3.0.5 release
* ipc/sem workaround (Peter)
* scheduler oddities (Peter/myself)
* hrtimer reprogramming RT only bug
* lib/atomic64 fixup (Yong)
* various compile fixes (several submitters [simply folded back])
Patch against 3.0.4 can be found here:
https://tglx.de/~tglx/rt/patch-3.0.4-rt14.patch.gz
The split quilt queue is available at:
https://tglx.de/~tglx/rt/patches-3.0.4-rt14.tar.gz
For those who don't have 3.0.4 around:
git://tesla.tglx.de/git/linux-2.6-tip rt/3.0
https://tglx.de/~tglx/rt/patch-3.0.4.gz
Delta patch against 3.0.4-rt13
https://tglx.de/~tglx/rt/patch-3.0.4-rt13-rt14.patch.gz
also included below.
Enjoy,
tglx
--------------->
Index: linux-2.6/arch/arm/kernel/perf_event.c
===================================================================
--- linux-2.6.orig/arch/arm/kernel/perf_event.c
+++ linux-2.6/arch/arm/kernel/perf_event.c
@@ -420,7 +420,7 @@ armpmu_reserve_hardware(void)
continue;
err = request_irq(irq, handle_irq,
- IRQF_DISABLED | IRQF_NOBALANCING | IRQF_NO_THREAD,
+ IRQF_NOBALANCING | IRQF_NO_THREAD,
"armpmu", NULL);
if (err) {
pr_warning("unable to request IRQ%d for ARM perf "
Index: linux-2.6/kernel/hrtimer.c
===================================================================
--- linux-2.6.orig/kernel/hrtimer.c
+++ linux-2.6/kernel/hrtimer.c
@@ -1314,7 +1314,11 @@ static void hrtimer_rt_reprogram(int res
if (!enqueue_hrtimer(timer, base))
return;
- if (hrtimer_reprogram(timer, base))
+#ifndef CONFIG_HIGH_RES_TIMERS
+ }
+#else
+ if (base->cpu_base->hres_active &&
+ hrtimer_reprogram(timer, base))
goto requeue;
} else if (hrtimer_active(timer)) {
@@ -1323,6 +1327,7 @@ static void hrtimer_rt_reprogram(int res
* the event device.
*/
if (&timer->node == base->active.next &&
+ base->cpu_base->hres_active &&
hrtimer_reprogram(timer, base))
goto requeue;
}
@@ -1335,6 +1340,7 @@ requeue:
*/
__remove_hrtimer(timer, base, timer->state, 0);
list_add_tail(&timer->cb_entry, &base->expired);
+#endif
}
/*
Index: linux-2.6/kernel/sched.c
===================================================================
--- linux-2.6.orig/kernel/sched.c
+++ linux-2.6/kernel/sched.c
@@ -5054,7 +5054,13 @@ EXPORT_SYMBOL(task_nice);
*/
int idle_cpu(int cpu)
{
- return cpu_curr(cpu) == cpu_rq(cpu)->idle;
+ struct rq *rq = cpu_rq(cpu);
+
+#ifdef CONFIG_SMP
+ return rq->curr == rq->idle && !rq->nr_running && !rq->wake_list;
+#else
+ return rq->curr == rq->idle && !rq->nr_running;
+#endif
}
/**
Index: linux-2.6/kernel/sched_debug.c
===================================================================
--- linux-2.6.orig/kernel/sched_debug.c
+++ linux-2.6/kernel/sched_debug.c
@@ -235,7 +235,9 @@ void print_rt_rq(struct seq_file *m, int
P(rt_throttled);
PN(rt_time);
PN(rt_runtime);
+#ifdef CONFIG_SMP
P(rt_nr_migratory);
+#endif
#undef PN
#undef P
Index: linux-2.6/kernel/sched_rt.c
===================================================================
--- linux-2.6.orig/kernel/sched_rt.c
+++ linux-2.6/kernel/sched_rt.c
@@ -1039,7 +1039,7 @@ select_task_rq_rt(struct task_struct *p,
*/
if (curr && unlikely(rt_task(curr)) &&
(curr->rt.nr_cpus_allowed < 2 ||
- curr->prio < p->prio) &&
+ curr->prio <= p->prio) &&
(p->rt.nr_cpus_allowed > 1)) {
int target = find_lowest_rq(p);
@@ -1570,7 +1570,7 @@ static void task_woken_rt(struct rq *rq,
p->rt.nr_cpus_allowed > 1 &&
rt_task(rq->curr) &&
(rq->curr->rt.nr_cpus_allowed < 2 ||
- rq->curr->prio < p->prio))
+ rq->curr->prio <= p->prio))
push_rt_tasks(rq);
}
Index: linux-2.6/lib/atomic64.c
===================================================================
--- linux-2.6.orig/lib/atomic64.c
+++ linux-2.6/lib/atomic64.c
@@ -33,7 +33,7 @@ static union {
char pad[L1_CACHE_BYTES];
} atomic64_lock[NR_LOCKS] __cacheline_aligned_in_smp;
-static inline spinlock_t *lock_addr(const atomic64_t *v)
+static inline raw_spinlock_t *lock_addr(const atomic64_t *v)
{
unsigned long addr = (unsigned long) v;
@@ -45,7 +45,7 @@ static inline spinlock_t *lock_addr(cons
long long atomic64_read(const atomic64_t *v)
{
unsigned long flags;
- spinlock_t *lock = lock_addr(v);
+ raw_spinlock_t *lock = lock_addr(v);
long long val;
raw_spin_lock_irqsave(lock, flags);
@@ -58,7 +58,7 @@ EXPORT_SYMBOL(atomic64_read);
void atomic64_set(atomic64_t *v, long long i)
{
unsigned long flags;
- spinlock_t *lock = lock_addr(v);
+ raw_spinlock_t *lock = lock_addr(v);
raw_spin_lock_irqsave(lock, flags);
v->counter = i;
@@ -69,7 +69,7 @@ EXPORT_SYMBOL(atomic64_set);
void atomic64_add(long long a, atomic64_t *v)
{
unsigned long flags;
- spinlock_t *lock = lock_addr(v);
+ raw_spinlock_t *lock = lock_addr(v);
raw_spin_lock_irqsave(lock, flags);
v->counter += a;
@@ -80,7 +80,7 @@ EXPORT_SYMBOL(atomic64_add);
long long atomic64_add_return(long long a, atomic64_t *v)
{
unsigned long flags;
- spinlock_t *lock = lock_addr(v);
+ raw_spinlock_t *lock = lock_addr(v);
long long val;
raw_spin_lock_irqsave(lock, flags);
@@ -93,7 +93,7 @@ EXPORT_SYMBOL(atomic64_add_return);
void atomic64_sub(long long a, atomic64_t *v)
{
unsigned long flags;
- spinlock_t *lock = lock_addr(v);
+ raw_spinlock_t *lock = lock_addr(v);
raw_spin_lock_irqsave(lock, flags);
v->counter -= a;
@@ -104,7 +104,7 @@ EXPORT_SYMBOL(atomic64_sub);
long long atomic64_sub_return(long long a, atomic64_t *v)
{
unsigned long flags;
- spinlock_t *lock = lock_addr(v);
+ raw_spinlock_t *lock = lock_addr(v);
long long val;
raw_spin_lock_irqsave(lock, flags);
@@ -117,7 +117,7 @@ EXPORT_SYMBOL(atomic64_sub_return);
long long atomic64_dec_if_positive(atomic64_t *v)
{
unsigned long flags;
- spinlock_t *lock = lock_addr(v);
+ raw_spinlock_t *lock = lock_addr(v);
long long val;
raw_spin_lock_irqsave(lock, flags);
@@ -132,7 +132,7 @@ EXPORT_SYMBOL(atomic64_dec_if_positive);
long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n)
{
unsigned long flags;
- spinlock_t *lock = lock_addr(v);
+ raw_spinlock_t *lock = lock_addr(v);
long long val;
raw_spin_lock_irqsave(lock, flags);
@@ -147,7 +147,7 @@ EXPORT_SYMBOL(atomic64_cmpxchg);
long long atomic64_xchg(atomic64_t *v, long long new)
{
unsigned long flags;
- spinlock_t *lock = lock_addr(v);
+ raw_spinlock_t *lock = lock_addr(v);
long long val;
raw_spin_lock_irqsave(lock, flags);
@@ -161,7 +161,7 @@ EXPORT_SYMBOL(atomic64_xchg);
int atomic64_add_unless(atomic64_t *v, long long a, long long u)
{
unsigned long flags;
- spinlock_t *lock = lock_addr(v);
+ raw_spinlock_t *lock = lock_addr(v);
int ret = 0;
raw_spin_lock_irqsave(lock, flags);
Index: linux-2.6/localversion-rt
===================================================================
--- linux-2.6.orig/localversion-rt
+++ linux-2.6/localversion-rt
@@ -1 +1 @@
--rt13
+-rt14
Index: linux-2.6/arch/arm/plat-mxc/include/mach/iomux-v3.h
===================================================================
--- linux-2.6.orig/arch/arm/plat-mxc/include/mach/iomux-v3.h
+++ linux-2.6/arch/arm/plat-mxc/include/mach/iomux-v3.h
@@ -66,7 +66,6 @@ typedef u64 iomux_v3_cfg_t;
#define MUX_MODE_MASK ((iomux_v3_cfg_t)0x1f << MUX_MODE_SHIFT)
#define MUX_PAD_CTRL_SHIFT 41
#define MUX_PAD_CTRL_MASK ((iomux_v3_cfg_t)0x1ffff << MUX_PAD_CTRL_SHIFT)
-#define NO_PAD_CTRL ((iomux_v3_cfg_t)1 << (MUX_PAD_CTRL_SHIFT + 16))
#define MUX_SEL_INPUT_SHIFT 58
#define MUX_SEL_INPUT_MASK ((iomux_v3_cfg_t)0xf << MUX_SEL_INPUT_SHIFT)
@@ -85,6 +84,7 @@ typedef u64 iomux_v3_cfg_t;
* Use to set PAD control
*/
+#define NO_PAD_CTRL (1 << 16)
#define PAD_CTL_DVS (1 << 13)
#define PAD_CTL_HYS (1 << 8)
Index: linux-2.6/kernel/sched_features.h
===================================================================
--- linux-2.6.orig/kernel/sched_features.h
+++ linux-2.6/kernel/sched_features.h
@@ -65,10 +65,14 @@ SCHED_FEAT(OWNER_SPIN, 1)
*/
SCHED_FEAT(NONIRQ_POWER, 1)
+#ifndef CONFIG_PREEMPT_RT_FULL
/*
* Queue remote wakeups on the target CPU and process them
* using the scheduler IPI. Reduces rq->lock contention/bounces.
*/
SCHED_FEAT(TTWU_QUEUE, 1)
+#else
+SCHED_FEAT(TTWU_QUEUE, 0)
+#endif
SCHED_FEAT(FORCE_SD_OVERLAP, 0)
Index: linux-2.6/ipc/sem.c
===================================================================
--- linux-2.6.orig/ipc/sem.c
+++ linux-2.6/ipc/sem.c
@@ -415,6 +415,13 @@ undo:
static void wake_up_sem_queue_prepare(struct list_head *pt,
struct sem_queue *q, int error)
{
+#ifdef CONFIG_PREEMPT_RT_BASE
+ struct task_struct *p = q->sleeper;
+ get_task_struct(p);
+ q->status = error;
+ wake_up_process(p);
+ put_task_struct(p);
+#else
if (list_empty(pt)) {
/*
* Hold preempt off so that we don't get preempted and have the
@@ -426,6 +433,7 @@ static void wake_up_sem_queue_prepare(st
q->pid = error;
list_add_tail(&q->simple_list, pt);
+#endif
}
/**
@@ -439,6 +447,7 @@ static void wake_up_sem_queue_prepare(st
*/
static void wake_up_sem_queue_do(struct list_head *pt)
{
+#ifndef CONFIG_PREEMPT_RT_BASE
struct sem_queue *q, *t;
int did_something;
@@ -451,6 +460,7 @@ static void wake_up_sem_queue_do(struct
}
if (did_something)
preempt_enable();
+#endif
}
static void unlink_queue(struct sem_array *sma, struct sem_queue *q)
--
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