Dear RT folks!
I'm pleased to announce the v3.10.14-rt9 patch set.
Changes since v3.10.14-rt8
- the threshold module option of hwlat is no longer ignored. Path sent
by Mike Galbraith
- two patches from Kirill Tkhai to get basic RT compiled on Sparc.
- the ppc patch for the 5200 has been altered slightly. Patch sent by
Wolfram Sang
- A patch for SLAB to get it working on !RT (Thanks Corey Minyard).
- a fix for "sleeping from invalid context" in clock_was_set_delayed().
Patch by Yang Shi.
- another fix for "sleeping from invalid context" in drain_all_stock.
Patch also by Yang Shi.
Known issues:
- SLAB support not working
- The cpsw network driver shows some 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 v3.10.10-rt6 is appended below and can be found
here:
https://www.kernel.org/pub/linux/kernel/projects/rt/3.10/incr/patch-3.10.14-rt8-rt9.patch.xz
The RT patch against 3.10.14 can be found here:
https://www.kernel.org/pub/linux/kernel/projects/rt/3.10/patch-3.10.14-rt9.patch.xz
The split quilt queue is available at:
https://www.kernel.org/pub/linux/kernel/projects/rt/3.10/patches-3.10.14-rt9.tar.xz
Sebastian
diff --git a/arch/powerpc/platforms/52xx/mpc52xx_pic.c b/arch/powerpc/platforms/52xx/mpc52xx_pic.c
index b69221b..2898b73 100644
--- a/arch/powerpc/platforms/52xx/mpc52xx_pic.c
+++ b/arch/powerpc/platforms/52xx/mpc52xx_pic.c
@@ -340,7 +340,7 @@ static int mpc52xx_irqhost_map(struct irq_domain *h, unsigned int virq,
{
int l1irq;
int l2irq;
- struct irq_chip *irqchip;
+ struct irq_chip *uninitialized_var(irqchip);
void *hndlr;
int type;
u32 reg;
@@ -373,9 +373,8 @@ static int mpc52xx_irqhost_map(struct irq_domain *h, unsigned int virq,
case MPC52xx_IRQ_L1_PERP: irqchip = &mpc52xx_periph_irqchip; break;
case MPC52xx_IRQ_L1_SDMA: irqchip = &mpc52xx_sdma_irqchip; break;
case MPC52xx_IRQ_L1_CRIT:
- default:
pr_warn("%s: Critical IRQ #%d is unsupported! Nopping it.\n",
- __func__, l1irq);
+ __func__, l2irq);
irq_set_chip(virq, &no_irq_chip);
return 0;
}
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 9ac9f16..6787bd3 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -521,6 +521,10 @@ menu "Executable file formats"
source "fs/Kconfig.binfmt"
+config EARLY_PRINTK
+ bool
+ default y
+
config COMPAT
bool
depends on SPARC64
diff --git a/arch/sparc/lib/ksyms.c b/arch/sparc/lib/ksyms.c
index 0c4e35e..323335b 100644
--- a/arch/sparc/lib/ksyms.c
+++ b/arch/sparc/lib/ksyms.c
@@ -98,15 +98,6 @@ EXPORT_SYMBOL(___copy_from_user);
EXPORT_SYMBOL(___copy_in_user);
EXPORT_SYMBOL(__clear_user);
-/* RW semaphores */
-EXPORT_SYMBOL(__down_read);
-EXPORT_SYMBOL(__down_read_trylock);
-EXPORT_SYMBOL(__down_write);
-EXPORT_SYMBOL(__down_write_trylock);
-EXPORT_SYMBOL(__up_read);
-EXPORT_SYMBOL(__up_write);
-EXPORT_SYMBOL(__downgrade_write);
-
/* Atomic counter implementation. */
EXPORT_SYMBOL(atomic_add);
EXPORT_SYMBOL(atomic_add_ret);
diff --git a/drivers/misc/hwlat_detector.c b/drivers/misc/hwlat_detector.c
index 6f61d5f..d2676b8 100644
--- a/drivers/misc/hwlat_detector.c
+++ b/drivers/misc/hwlat_detector.c
@@ -413,7 +413,7 @@ static int init_stats(void)
goto out;
__reset_stats();
- data.threshold = DEFAULT_LAT_THRESHOLD; /* threshold us */
+ data.threshold = threshold ?: DEFAULT_LAT_THRESHOLD; /* threshold us */
data.sample_window = DEFAULT_SAMPLE_WINDOW; /* window us */
data.sample_width = DEFAULT_SAMPLE_WIDTH; /* width us */
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index bd61c40..a63cfaf 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -47,6 +47,7 @@
#include <linux/sched/sysctl.h>
#include <linux/sched/rt.h>
#include <linux/timer.h>
+#include <linux/kthread.h>
#include <asm/uaccess.h>
@@ -740,6 +741,44 @@ static void clock_was_set_work(struct work_struct *work)
static DECLARE_WORK(hrtimer_work, clock_was_set_work);
+#ifdef CONFIG_PREEMPT_RT_FULL
+/*
+ * RT can not call schedule_work from real interrupt context.
+ * Need to make a thread to do the real work.
+ */
+static struct task_struct *clock_set_delay_thread;
+static bool do_clock_set_delay;
+
+static int run_clock_set_delay(void *ignore)
+{
+ while (!kthread_should_stop()) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ if (do_clock_set_delay) {
+ do_clock_set_delay = false;
+ schedule_work(&hrtimer_work);
+ }
+ schedule();
+ }
+ __set_current_state(TASK_RUNNING);
+ return 0;
+}
+
+void clock_was_set_delayed(void)
+{
+ do_clock_set_delay = true;
+ /* Make visible before waking up process */
+ smp_wmb();
+ wake_up_process(clock_set_delay_thread);
+}
+
+static __init int create_clock_set_delay_thread(void)
+{
+ clock_set_delay_thread = kthread_run(run_clock_set_delay, NULL, "kclksetdelayd");
+ BUG_ON(!clock_set_delay_thread);
+ return 0;
+}
+early_initcall(create_clock_set_delay_thread);
+#else /* PREEMPT_RT_FULL */
/*
* Called from timekeeping and resume code to reprogramm the hrtimer
* interrupt device on all cpus.
@@ -748,6 +787,7 @@ void clock_was_set_delayed(void)
{
schedule_work(&hrtimer_work);
}
+#endif
#else
diff --git a/localversion-rt b/localversion-rt
index 700c857..22746d6 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt8
+-rt9
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 905ce72..f113cb7 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2436,11 +2436,10 @@ static void refill_stock(struct mem_cgroup *memcg, unsigned int nr_pages)
*/
static void drain_all_stock(struct mem_cgroup *root_memcg, bool sync)
{
- int cpu, curcpu;
+ int cpu;
/* Notify other cpus that system-wide "drain" is running */
get_online_cpus();
- curcpu = get_cpu();
for_each_online_cpu(cpu) {
struct memcg_stock_pcp *stock = &per_cpu(memcg_stock, cpu);
struct mem_cgroup *memcg;
@@ -2450,14 +2449,9 @@ static void drain_all_stock(struct mem_cgroup *root_memcg, bool sync)
continue;
if (!mem_cgroup_same_or_subtree(root_memcg, memcg))
continue;
- if (!test_and_set_bit(FLUSHING_CACHED_CHARGE, &stock->flags)) {
- if (cpu == curcpu)
- drain_local_stock(&stock->work);
- else
- schedule_work_on(cpu, &stock->work);
- }
+ if (!test_and_set_bit(FLUSHING_CACHED_CHARGE, &stock->flags))
+ schedule_work_on(cpu, &stock->work);
}
- put_cpu();
if (!sync)
goto out;
diff --git a/mm/slab.c b/mm/slab.c
index 494274e..0a3d6d3 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1270,7 +1270,6 @@ static void __cpuinit cpuup_canceled(long cpu)
free_block(cachep, nc->entry, nc->avail, node);
if (!cpumask_empty(mask)) {
- local_spin_unlock_irq(slab_lock, &n->list_lock);
unlock_l3_and_free_delayed(&n->list_lock);
goto free_array_cache;
}
@@ -1285,7 +1284,6 @@ static void __cpuinit cpuup_canceled(long cpu)
alien = n->alien;
n->alien = NULL;
- local_spin_unlock_irq(slab_lock, &n->list_lock);
unlock_l3_and_free_delayed(&n->list_lock);
kfree(shared);
--
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