Dear RT Folks,
I'm pleased to announce the 3.0.8-rt21 release.
3.0.8-rt21 is an not announced intermediate release, which only
updates to 3.0.8. No rt changes except dropping patches which made it
into 3.0.8.
Changes from 3.0.8-rt21 to 3.0.8-rt22
* Revert cpufreq changes
* Fix some hotplug issues (Yong, myself)
* Require constant freq TSC for KVM on RT (replaces the cpufreq
tinkering which led to other nasty issues)
Delta patch against 3.0.8-rt21
https://tglx.de/~tglx/rt/incr/patch-3.0.8-rt21-rt22.patch.gz
also appended below.
Patch against 3.0.8 can be found here:
https://tglx.de/~tglx/rt/patch-3.0.8-rt22.patch.gz
The split quilt queue is available at:
https://tglx.de/~tglx/rt/patches-3.0.8-rt22.tar.gz
Some folks were asking about an 3.1 based RT. I'm not going to release
one (though it should be trivial). I really want to stabilize 3.0 and
not create a side show which diverts testing. Next version I'm
targeting is 3.2 starting soon after the merge window closes.
Enjoy,
tglx
--------------->
Index: linux-2.6/drivers/cpufreq/cpufreq.c
===================================================================
--- linux-2.6.orig/drivers/cpufreq/cpufreq.c
+++ linux-2.6/drivers/cpufreq/cpufreq.c
@@ -43,7 +43,7 @@ static DEFINE_PER_CPU(struct cpufreq_pol
/* This one keeps track of the previously set governor of a removed CPU */
static DEFINE_PER_CPU(char[CPUFREQ_NAME_LEN], cpufreq_cpu_governor);
#endif
-static DEFINE_RAW_SPINLOCK(cpufreq_driver_lock);
+static DEFINE_SPINLOCK(cpufreq_driver_lock);
/*
* cpu_policy_rwsem is a per CPU reader-writer semaphore designed to cure
@@ -138,7 +138,7 @@ struct cpufreq_policy *cpufreq_cpu_get(u
goto err_out;
/* get the cpufreq driver */
- raw_spin_lock_irqsave(&cpufreq_driver_lock, flags);
+ spin_lock_irqsave(&cpufreq_driver_lock, flags);
if (!cpufreq_driver)
goto err_out_unlock;
@@ -156,13 +156,13 @@ struct cpufreq_policy *cpufreq_cpu_get(u
if (!kobject_get(&data->kobj))
goto err_out_put_module;
- raw_spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
+ spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
return data;
err_out_put_module:
module_put(cpufreq_driver->owner);
err_out_unlock:
- raw_spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
+ spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
err_out:
return NULL;
}
@@ -722,10 +722,10 @@ static int cpufreq_add_dev_policy(unsign
return -EBUSY;
}
- raw_spin_lock_irqsave(&cpufreq_driver_lock, flags);
+ spin_lock_irqsave(&cpufreq_driver_lock, flags);
cpumask_copy(managed_policy->cpus, policy->cpus);
per_cpu(cpufreq_cpu_data, cpu) = managed_policy;
- raw_spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
+ spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
pr_debug("CPU already managed, adding link\n");
ret = sysfs_create_link(&sys_dev->kobj,
@@ -821,16 +821,14 @@ static int cpufreq_add_dev_interface(uns
goto err_out_kobj_put;
}
- get_online_cpus();
+ spin_lock_irqsave(&cpufreq_driver_lock, flags);
for_each_cpu(j, policy->cpus) {
if (!cpu_online(j))
continue;
- raw_spin_lock_irqsave(&cpufreq_driver_lock, flags);
per_cpu(cpufreq_cpu_data, j) = policy;
per_cpu(cpufreq_policy_cpu, j) = policy->cpu;
- raw_spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
}
- put_online_cpus();
+ spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
ret = cpufreq_add_dev_symlink(cpu, policy);
if (ret)
@@ -972,13 +970,10 @@ static int cpufreq_add_dev(struct sys_de
err_out_unregister:
- get_online_cpus();
- for_each_cpu(j, policy->cpus) {
- raw_spin_lock_irqsave(&cpufreq_driver_lock, flags);
+ spin_lock_irqsave(&cpufreq_driver_lock, flags);
+ for_each_cpu(j, policy->cpus)
per_cpu(cpufreq_cpu_data, j) = NULL;
- raw_spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
- }
- put_online_cpus();
+ spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
kobject_put(&policy->kobj);
wait_for_completion(&policy->kobj_unregister);
@@ -1018,11 +1013,11 @@ static int __cpufreq_remove_dev(struct s
pr_debug("unregistering CPU %u\n", cpu);
- raw_spin_lock_irqsave(&cpufreq_driver_lock, flags);
+ spin_lock_irqsave(&cpufreq_driver_lock, flags);
data = per_cpu(cpufreq_cpu_data, cpu);
if (!data) {
- raw_spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
+ spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
unlock_policy_rwsem_write(cpu);
return -EINVAL;
}
@@ -1036,7 +1031,7 @@ static int __cpufreq_remove_dev(struct s
if (unlikely(cpu != data->cpu)) {
pr_debug("removing link\n");
cpumask_clear_cpu(cpu, data->cpus);
- raw_spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
+ spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
kobj = &sys_dev->kobj;
cpufreq_cpu_put(data);
unlock_policy_rwsem_write(cpu);
@@ -1045,7 +1040,6 @@ static int __cpufreq_remove_dev(struct s
}
#endif
- raw_spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
#ifdef CONFIG_SMP
#ifdef CONFIG_HOTPLUG_CPU
@@ -1058,17 +1052,15 @@ static int __cpufreq_remove_dev(struct s
* per_cpu(cpufreq_cpu_data) while holding the lock, and remove
* the sysfs links afterwards.
*/
- get_online_cpus();
if (unlikely(cpumask_weight(data->cpus) > 1)) {
for_each_cpu(j, data->cpus) {
if (j == cpu)
continue;
- raw_spin_lock_irqsave(&cpufreq_driver_lock, flags);
per_cpu(cpufreq_cpu_data, j) = NULL;
- raw_spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
}
}
- put_online_cpus();
+
+ spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
if (unlikely(cpumask_weight(data->cpus) > 1)) {
for_each_cpu(j, data->cpus) {
@@ -1087,6 +1079,8 @@ static int __cpufreq_remove_dev(struct s
cpufreq_cpu_put(data);
}
}
+#else
+ spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
#endif
if (cpufreq_driver->target)
@@ -1808,13 +1802,13 @@ int cpufreq_register_driver(struct cpufr
if (driver_data->setpolicy)
driver_data->flags |= CPUFREQ_CONST_LOOPS;
- raw_spin_lock_irqsave(&cpufreq_driver_lock, flags);
+ spin_lock_irqsave(&cpufreq_driver_lock, flags);
if (cpufreq_driver) {
- raw_spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
+ spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
return -EBUSY;
}
cpufreq_driver = driver_data;
- raw_spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
+ spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
ret = sysdev_driver_register(&cpu_sysdev_class,
&cpufreq_sysdev_driver);
@@ -1848,9 +1842,9 @@ err_sysdev_unreg:
sysdev_driver_unregister(&cpu_sysdev_class,
&cpufreq_sysdev_driver);
err_null_driver:
- raw_spin_lock_irqsave(&cpufreq_driver_lock, flags);
+ spin_lock_irqsave(&cpufreq_driver_lock, flags);
cpufreq_driver = NULL;
- raw_spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
+ spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
return ret;
}
EXPORT_SYMBOL_GPL(cpufreq_register_driver);
@@ -1876,9 +1870,9 @@ int cpufreq_unregister_driver(struct cpu
sysdev_driver_unregister(&cpu_sysdev_class, &cpufreq_sysdev_driver);
unregister_hotcpu_notifier(&cpufreq_cpu_notifier);
- raw_spin_lock_irqsave(&cpufreq_driver_lock, flags);
+ spin_lock_irqsave(&cpufreq_driver_lock, flags);
cpufreq_driver = NULL;
- raw_spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
+ spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
return 0;
}
Index: linux-2.6/kernel/cpu.c
===================================================================
--- linux-2.6.orig/kernel/cpu.c
+++ linux-2.6/kernel/cpu.c
@@ -337,22 +337,20 @@ static int __ref _cpu_down(unsigned int
return -EBUSY;
}
- err = __cpu_notify(CPU_DOWN_PREPARE | mod, hcpu, -1, &nr_calls);
+ cpu_hotplug_begin();
+ err = cpu_unplug_begin(cpu);
if (err) {
- nr_calls--;
- __cpu_notify(CPU_DOWN_FAILED | mod, hcpu, nr_calls, NULL);
- printk("%s: attempt to take down CPU %u failed\n",
- __func__, cpu);
+ printk("cpu_unplug_begin(%d) failed\n", cpu);
goto out_cancel;
}
- cpu_hotplug_begin();
- err = cpu_unplug_begin(cpu);
+ err = __cpu_notify(CPU_DOWN_PREPARE | mod, hcpu, -1, &nr_calls);
if (err) {
nr_calls--;
__cpu_notify(CPU_DOWN_FAILED | mod, hcpu, nr_calls, NULL);
- printk("cpu_unplug_begin(%d) failed\n", cpu);
- goto out_cancel;
+ printk("%s: attempt to take down CPU %u failed\n",
+ __func__, cpu);
+ goto out_release;
}
err = __stop_machine(take_cpu_down, &tcd_param, cpumask_of(cpu));
Index: linux-2.6/kernel/sched.c
===================================================================
--- linux-2.6.orig/kernel/sched.c
+++ linux-2.6/kernel/sched.c
@@ -2403,7 +2403,12 @@ static int select_fallback_rq(int cpu, s
printk(KERN_INFO "process %d (%s) no longer affine to cpu%d\n",
task_pid_nr(p), p->comm, cpu);
}
-
+ /*
+ * Clear PF_THREAD_BOUND, otherwise we wreckage
+ * migrate_disable/enable. See optimization for
+ * PF_THREAD_BOUND tasks there.
+ */
+ p->flags &= ~PF_THREAD_BOUND;
return dest_cpu;
}
Index: linux-2.6/kernel/workqueue.c
===================================================================
--- linux-2.6.orig/kernel/workqueue.c
+++ linux-2.6/kernel/workqueue.c
@@ -3192,6 +3192,11 @@ static int __devinit workqueue_cpu_up_ca
new_worker = create_worker(gcwq, false);
if (!new_worker)
return NOTIFY_BAD;
+ case CPU_UP_CANCELED:
+ case CPU_ONLINE:
+ break;
+ default:
+ return notifier_from_errno(0);
}
/* some are called w/ irq disabled, don't disturb irq status */
Index: linux-2.6/localversion-rt
===================================================================
--- linux-2.6.orig/localversion-rt
+++ linux-2.6/localversion-rt
@@ -1 +1 @@
--rt21
+-rt22
Index: linux-2.6/arch/x86/kvm/x86.c
===================================================================
--- linux-2.6.orig/arch/x86/kvm/x86.c
+++ linux-2.6/arch/x86/kvm/x86.c
@@ -4900,6 +4900,13 @@ int kvm_arch_init(void *opaque)
goto out;
}
+#ifdef CONFIG_PREEMPT_RT_FULL
+ if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) {
+ printk(KERN_ERR "RT requires X86_FEATURE_CONSTANT_TSC\n");
+ return -EOPNOTSUPP;
+ }
+#endif
+
r = kvm_mmu_module_init();
if (r)
goto out;
--
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