Re: [ANNOUNCE] 3.0-rt6

Peter Zijlstra
2011-08-04T09:43:24Z

On Wed, 2011-08-03 at 23:34 -0700, Fernando Lopez-Lezcano wrote:
> [ 117.026009] [<ffffffff814ef322>] _raw_spin_lock+0x45/0x79
> [ 117.026009] [<ffffffff8107b6f1>] ? __run_posix_cpu_timers+0x8f/0x353
> [ 117.026009] [<ffffffff8107b6f1>] __run_posix_cpu_timers+0x8f/0x353

I think its this one, could you confirm?

---
Index: linux-2.6/kernel/posix-cpu-timers.c
===================================================================
--- linux-2.6.orig/kernel/posix-cpu-timers.c
+++ linux-2.6/kernel/posix-cpu-timers.c
@@ -1288,10 +1288,11 @@ static inline int fastpath_timer_check(s
sig = tsk->signal;
if (sig->cputimer.running) {
struct task_cputime group_sample;
+ unsigned long flags;

- raw_spin_lock(&sig->cputimer.lock);
+ raw_spin_lock_irqsave(&sig->cputimer.lock, flags);
group_sample = sig->cputimer.cputime;
- raw_spin_unlock(&sig->cputimer.lock);
+ raw_spin_unlock_irqrestore(&sig->cputimer.lock, flags);

if (task_cputime_expired(&group_sample, &sig->cputime_expires))
return 1;