Re: 2.6.15-rt17

[Karsten Wiese]

> 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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