lkml.org 
[lkml]   [2005]   [Jan]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
SubjectRe: BUG: 2.6.11-rc2 and -rc1 hang during boot on PowerMacs
From
Date
On Sun, 2005-01-23 at 11:43 +1100, Benjamin Herrenschmidt wrote:

> I know about this problem, I'm working on a proper fix. Thanks for your
> report.

Can you send me the PVR value for both of these CPUs
(cat /proc/cpuinfo) ? I can't find right now why they would lock up
unless the default idle loop is _not_ run properly, that is for some
reason, NAP or DOZE mode end up not beeing enabled. Can you send me
your .config as well ?

Finally, try that patch and tell me if it makes a difference. It makes
sure we re-enable interrupts in cpu_idle, and thus should only be a
workaround. I found _one_ actual code path where we fail to re-enable
them, and this is when neither DOZE nor NAP mode is enabled, which
should not happen on any G3 (they should all support DOZE mode), and
might happe non some G4s if the chipset doesn't support NAP or
powersave_nap is set to 0 in proc, but that shouldn't be the case of an
eMac neither...

--- linux-work.orig/arch/ppc/kernel/idle.c 2005-01-24 11:42:35.000000000 +1100
+++ linux-work/arch/ppc/kernel/idle.c 2005-01-24 12:19:41.114353760 +1100
@@ -39,17 +39,15 @@
powersave = ppc_md.power_save;

if (!need_resched()) {
+ local_irq_enable();
if (powersave != NULL)
powersave();
else {
#ifdef CONFIG_SMP
set_thread_flag(TIF_POLLING_NRFLAG);
- local_irq_enable();
while (!need_resched())
barrier();
clear_thread_flag(TIF_POLLING_NRFLAG);
-#else
- local_irq_enable();
#endif
}
}
Ben.


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 14:09    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site