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authorIngo Molnar <mingo@elte.hu>2009-08-25 10:04:27 +0200
committerIngo Molnar <mingo@elte.hu>2009-08-25 10:04:32 +0200
commitdaedc71836e5a398fd0cc0e12c5cb43539478485 (patch)
treec56567a92017679e57195cef992d4a5561c20e0e /kernel/irq
parentc36ba80ea01d0aecb652c26799a912e760ce8981 (diff)
parent422bef879e84104fee6dc68ded0e371dbeb5f88e (diff)
downloadlinux-daedc71836e5a398fd0cc0e12c5cb43539478485.tar.bz2
Merge commit 'v2.6.31-rc7' into irq/core
Merge reason: move from an -rc2 base to -rc7. Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/irq')
-rw-r--r--kernel/irq/internals.h3
-rw-r--r--kernel/irq/manage.c82
-rw-r--r--kernel/irq/migration.c2
-rw-r--r--kernel/irq/numa_migrate.c4
4 files changed, 68 insertions, 23 deletions
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index 73468253143b..e70ed5592eb9 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -42,8 +42,7 @@ static inline void unregister_handler_proc(unsigned int irq,
extern int irq_select_affinity_usr(unsigned int irq);
-extern void
-irq_set_thread_affinity(struct irq_desc *desc, const struct cpumask *cpumask);
+extern void irq_set_thread_affinity(struct irq_desc *desc);
/*
* Debugging printout:
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 50da67672901..0ec9ed831737 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -80,14 +80,22 @@ int irq_can_set_affinity(unsigned int irq)
return 1;
}
-void
-irq_set_thread_affinity(struct irq_desc *desc, const struct cpumask *cpumask)
+/**
+ * irq_set_thread_affinity - Notify irq threads to adjust affinity
+ * @desc: irq descriptor which has affitnity changed
+ *
+ * We just set IRQTF_AFFINITY and delegate the affinity setting
+ * to the interrupt thread itself. We can not call
+ * set_cpus_allowed_ptr() here as we hold desc->lock and this
+ * code can be called from hard interrupt context.
+ */
+void irq_set_thread_affinity(struct irq_desc *desc)
{
struct irqaction *action = desc->action;
while (action) {
if (action->thread)
- set_cpus_allowed_ptr(action->thread, cpumask);
+ set_bit(IRQTF_AFFINITY, &action->thread_flags);
action = action->next;
}
}
@@ -112,7 +120,7 @@ int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask)
if (desc->status & IRQ_MOVE_PCNTXT) {
if (!desc->chip->set_affinity(irq, cpumask)) {
cpumask_copy(desc->affinity, cpumask);
- irq_set_thread_affinity(desc, cpumask);
+ irq_set_thread_affinity(desc);
}
}
else {
@@ -122,7 +130,7 @@ int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask)
#else
if (!desc->chip->set_affinity(irq, cpumask)) {
cpumask_copy(desc->affinity, cpumask);
- irq_set_thread_affinity(desc, cpumask);
+ irq_set_thread_affinity(desc);
}
#endif
desc->status |= IRQ_AFFINITY_SET;
@@ -176,7 +184,7 @@ int irq_select_affinity_usr(unsigned int irq)
spin_lock_irqsave(&desc->lock, flags);
ret = setup_affinity(irq, desc);
if (!ret)
- irq_set_thread_affinity(desc, desc->affinity);
+ irq_set_thread_affinity(desc);
spin_unlock_irqrestore(&desc->lock, flags);
return ret;
@@ -443,6 +451,39 @@ static int irq_wait_for_interrupt(struct irqaction *action)
return -1;
}
+#ifdef CONFIG_SMP
+/*
+ * Check whether we need to change the affinity of the interrupt thread.
+ */
+static void
+irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action)
+{
+ cpumask_var_t mask;
+
+ if (!test_and_clear_bit(IRQTF_AFFINITY, &action->thread_flags))
+ return;
+
+ /*
+ * In case we are out of memory we set IRQTF_AFFINITY again and
+ * try again next time
+ */
+ if (!alloc_cpumask_var(&mask, GFP_KERNEL)) {
+ set_bit(IRQTF_AFFINITY, &action->thread_flags);
+ return;
+ }
+
+ spin_lock_irq(&desc->lock);
+ cpumask_copy(mask, desc->affinity);
+ spin_unlock_irq(&desc->lock);
+
+ set_cpus_allowed_ptr(current, mask);
+ free_cpumask_var(mask);
+}
+#else
+static inline void
+irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action) { }
+#endif
+
/*
* Interrupt handler thread
*/
@@ -458,6 +499,8 @@ static int irq_thread(void *data)
while (!irq_wait_for_interrupt(action)) {
+ irq_thread_check_affinity(desc, action);
+
atomic_inc(&desc->threads_active);
spin_lock_irq(&desc->lock);
@@ -564,7 +607,6 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
*/
get_task_struct(t);
new->thread = t;
- wake_up_process(t);
}
/*
@@ -647,6 +689,7 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
(int)(new->flags & IRQF_TRIGGER_MASK));
}
+ new->irq = irq;
*old_ptr = new;
/* Reset broken irq detection when installing new handler */
@@ -664,7 +707,13 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
spin_unlock_irqrestore(&desc->lock, flags);
- new->irq = irq;
+ /*
+ * Strictly no need to wake it up, but hung_task complains
+ * when no hard interrupt wakes the thread up.
+ */
+ if (new->thread)
+ wake_up_process(new->thread);
+
register_irq_proc(irq, desc);
new->dir = NULL;
register_handler_proc(irq, new);
@@ -718,7 +767,6 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id)
{
struct irq_desc *desc = irq_to_desc(irq);
struct irqaction *action, **action_ptr;
- struct task_struct *irqthread;
unsigned long flags;
WARN(in_interrupt(), "Trying to free IRQ %d from IRQ context!\n", irq);
@@ -766,9 +814,6 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id)
desc->chip->disable(irq);
}
- irqthread = action->thread;
- action->thread = NULL;
-
spin_unlock_irqrestore(&desc->lock, flags);
unregister_handler_proc(irq, action);
@@ -776,12 +821,6 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id)
/* Make sure it's not being used on another CPU: */
synchronize_irq(irq);
- if (irqthread) {
- if (!test_bit(IRQTF_DIED, &action->thread_flags))
- kthread_stop(irqthread);
- put_task_struct(irqthread);
- }
-
#ifdef CONFIG_DEBUG_SHIRQ
/*
* It's a shared IRQ -- the driver ought to be prepared for an IRQ
@@ -797,6 +836,13 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id)
local_irq_restore(flags);
}
#endif
+
+ if (action->thread) {
+ if (!test_bit(IRQTF_DIED, &action->thread_flags))
+ kthread_stop(action->thread);
+ put_task_struct(action->thread);
+ }
+
return action;
}
diff --git a/kernel/irq/migration.c b/kernel/irq/migration.c
index cfe767ca1545..fcb6c96f2627 100644
--- a/kernel/irq/migration.c
+++ b/kernel/irq/migration.c
@@ -45,7 +45,7 @@ void move_masked_irq(int irq)
< nr_cpu_ids))
if (!desc->chip->set_affinity(irq, desc->pending_mask)) {
cpumask_copy(desc->affinity, desc->pending_mask);
- irq_set_thread_affinity(desc, desc->pending_mask);
+ irq_set_thread_affinity(desc);
}
cpumask_clear(desc->pending_mask);
diff --git a/kernel/irq/numa_migrate.c b/kernel/irq/numa_migrate.c
index 2f69bee57bf2..3fd30197da2e 100644
--- a/kernel/irq/numa_migrate.c
+++ b/kernel/irq/numa_migrate.c
@@ -107,8 +107,8 @@ out_unlock:
struct irq_desc *move_irq_desc(struct irq_desc *desc, int node)
{
- /* those all static, do move them */
- if (desc->irq < NR_IRQS_LEGACY)
+ /* those static or target node is -1, do not move them */
+ if (desc->irq < NR_IRQS_LEGACY || node == -1)
return desc;
if (desc->node != node)