On Wed, 2007-10-24 at 17:55 +0200, Ingo Molnar wrote:
Does this help?
---
Subject: lockdep: invalid irq usage
this function can be called from hardirq context.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
Index: linux-2.6-2/kernel/sched_debug.c
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
--- linux-2.6-2.orig/kernel/sched_debug.c
+++ linux-2.6-2/kernel/sched_debug.c
@@ -80,6 +80,7 @@ print_task(struct seq_file *m, struct rq
static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu)
{
struct task_struct *g, *p;
+ unsigned long flags;
=20
SEQ_printf(m,
"\nrunnable tasks:\n"
@@ -88,7 +89,7 @@ static void print_rq(struct seq_file *m,
"------------------------------------------------------"
"----------------------------------------------------\n");
=20
- read_lock_irq(&tasklist_lock);
+ read_lock_irqsave(&tasklist_lock, flags);
=20
do_each_thread(g, p) {
if (!p->se.on_rq || task_cpu(p) !=3D rq_cpu)
@@ -97,7 +98,7 @@ static void print_rq(struct seq_file *m,
print_task(m, rq, p);
} while_each_thread(g, p);
=20
- read_unlock_irq(&tasklist_lock);
+ read_unlock_irqrestore(&tasklist_lock, flags);
}
=20
void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)