Il giorno ven, 22/12/2006 alle 00.30 -0800, Andrew Morton ha scritto:
> On Fri, 22 Dec 2006 09:22:48 +0100
> Ard -kwaak- van Breemen <[email protected]> wrote:
>
> > Hello,
> > On Fri, Dec 22, 2006 at 12:41:46PM +0800, Zhang, Yanmin wrote:
> > > I think parse_args enables irq when it calls callbacks.
> > > Could you try below?
> > > 1) Test Andrew's patch of sema down_write;
> > > 2) Apply below patch and see what the output is when booting. If the output has
> > > "[BUG]..address.", Pls. map the address to function name by System.map.
> > Without proof^H^H^H^H^Hpasting my dmesg and the "diff", I already
> > concluded that ide_setup was the culprit. (I've debuged
> > parse_one, and it barfed around the 3rd parameter which is
> > hdb=noprobe).
> > Anyway, a bad night of sleep reminds me that our EM64T boxes also
> > have this line (which actually is a remainder of our VA1220 boxes
> > ;-) ), and they don't barf, so it must be either the combination
> > of the sata_nv together with the pata driver part, *or* just the
> > pata driver part. (Our opteron != nforce chipsets also works).
> >
>
> I expect that you'll find that the ide code ends up doing
> down_write(pci_bus_sem), which will enable interrupts.
>
> (We don't know which interrupt is pending this early - that'd be
> interesting to find out, but we shouldn't be enabling interrupts in there).
>
> To whom do I have to pay how much to get this darn patch tested?
>
>
>
> --- 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 (;;) {
> _
>
Applied to 2.6.19 it doesn't change anything. It still panics.
How can I have something similar to a serial console on a laptop without
serial port but with a parallel one? Will netconsole work?
--
Stefano Takekawa
[email protected]
Frank: And why do days get longer in the summer?
Ernest: Because heat makes things expand!
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