On Thu, 21 Dec 2006 20:52:40 +0100
Ard -kwaak- van Breemen <[email protected]> wrote:
> Hello,
>
> On Thu, Dec 21, 2006 at 04:04:04PM +0800, Zhang, Yanmin wrote:
> > I couldn't reproduce it on my EM64T machine. I instrumented function start_kernel and
> > didn't find irq was enabled before calling init_IRQ. It'll be better if the reporter could
> > instrument function start_kernel to capture which function enables irq.
> Just diving into the sources.
> Is that something like:
> if(!raw_irqs_disabled_flags) printk "irqs are enabled";
>
> (At that moment it might have crashed already.. :-)).
>
> I don't see the complete context yet, but I hope the irq is
> triggered after the irq is somehow enabled.
>
> BTW: the panic occurs on half of my boards on tyan S2891 with 2
> opterons, of which the only difference seems to be the purchase
> date (and hence probably the motherboard revisions). (Haven't got
> time yet to pull them out of the rack and compare the
> motherboards).
please, I'm still waiting for someone to tell me whether this "fixes" it:
--- a/lib/rwsem-spinlock.c~down_write-preserve-local-irqs
+++ a/lib/rwsem-spinlock.c
@@ -195,13 +195,14 @@ void fastcall __sched __down_write_neste
{
struct rwsem_waiter waiter;
struct task_struct *tsk;
+ unsigned long flags;
- spin_lock_irq(&sem->wait_lock);
+ spin_lock_irqsave(&sem->wait_lock, flags);
if (sem->activity == 0 && list_empty(&sem->wait_list)) {
/* granted */
sem->activity = -1;
- spin_unlock_irq(&sem->wait_lock);
+ spin_unlock_irqrestore(&sem->wait_lock, flags);
goto out;
}
@@ -216,7 +217,7 @@ void fastcall __sched __down_write_neste
list_add_tail(&waiter.list, &sem->wait_list);
/* we don't need to touch the semaphore struct anymore */
- spin_unlock_irq(&sem->wait_lock);
+ spin_unlock_irqrestore(&sem->wait_lock, flags);
/* wait to be given the lock */
for (;;) {
_
-
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