> the tasklet code was reworked too to be PREEMPT_RT friendly: the new PI
> code unearthed a fundamental livelock scenario with PREEMPT_RT, and the
> fix was to rework the tasklet code to get rid of the 'retrigger
> softirqs' approach.
following patch re enables tasklet_hi.
needed by ALSA MIDI.
Karsten
--- /tmp/softirq.c~ 2006-02-28 20:17:03.000000000 +0100
+++ /tmp/softirq.c 2006-02-28 20:17:03.000000000 +0100
@@ -351,13 +351,13 @@
static DEFINE_PER_CPU(struct tasklet_head, tasklet_hi_vec) = { NULL };
static void inline
-__tasklet_common_schedule(struct tasklet_struct *t, struct tasklet_head *head)
+__tasklet_common_schedule(struct tasklet_struct *t, struct tasklet_head *head, unsigned int nr)
{
if (tasklet_trylock(t)) {
WARN_ON(t->next != NULL);
t->next = head->list;
head->list = t;
- raise_softirq_irqoff(TASKLET_SOFTIRQ);
+ raise_softirq_irqoff(nr);
tasklet_unlock(t);
}
}
@@ -367,7 +367,7 @@
unsigned long flags;
raw_local_irq_save(flags);
- __tasklet_common_schedule(t, &__get_cpu_var(tasklet_vec));
+ __tasklet_common_schedule(t, &__get_cpu_var(tasklet_vec), TASKLET_SOFTIRQ);
raw_local_irq_restore(flags);
}
@@ -378,7 +378,7 @@
unsigned long flags;
raw_local_irq_save(flags);
- __tasklet_common_schedule(t, &__get_cpu_var(tasklet_hi_vec));
+ __tasklet_common_schedule(t, &__get_cpu_var(tasklet_hi_vec), HI_SOFTIRQ);
raw_local_irq_restore(flags);
}
_
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