On Fri, 2010-07-23 at 16:39 +0200, Mike Galbraith wrote:
> Greetings,
>
> Consoles (serial and vt) are going silent after.
>
> [ 1.100178] Freeing initrd memory: 9348k freed
> [ 1.453009] Freeing unused kernel memory: 1000k freed
> [ 1.464463] Freeing unused kernel memory: 512k freed
> [ 1.469724] Freeing unused kernel memory: 360k freed
>
> If the kernel is configured PREEMPT_VOLUNTARY, consoles work fine again.
> So far, I've only eyeballed the rt patch, and noticed nothing. I'll be
> poking around in (shudder) console code soon I suppose, but before I
> start that.. adventure, is this a known issue?
Hm, that was suspiciously easy.
console: really enable interrupts in release_console_mutex()
vprintk()
raw_local_irq_save()
acquire_console_mutex_for_printk()
release_console_mutex()
raw_spin_unlock_save()
raw_spin_unlock_irqrestore()
call_console_drivers()
_call_console_drivers()
__call_console_drivers()
console_atomic_safe() "nope".
Signed-off-by: Mike Galbraith <efault@xxxxxx>
---
kernel/printk.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
Index: tip-rt/kernel/printk.c
===================================================================
--- tip-rt.orig/kernel/printk.c
+++ tip-rt/kernel/printk.c
@@ -1072,7 +1072,7 @@ void release_console_mutex(void)
* with interrupts disabled):
*/
#ifdef CONFIG_PREEMPT_RT
- raw_spin_unlock_irqrestore(&logbuf_lock, flags);
+ raw_spin_unlock_irq(&logbuf_lock);
#else
raw_spin_unlock(&logbuf_lock);
stop_critical_timings(); /* don't trace print latency */
--
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