Messages in this thread | ![/](/images/icornerl.gif) | | From | Michael Thalmeier <> | Subject | Re: [PATCH RT 2/2] fix printk flush of messages | Date | Tue, 21 Aug 2012 14:30:18 +0000 (UTC) |
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Frank Rowand <frank.rowand <at> am.sony.com> writes:
> > > Updates console-make-rt-friendly.patch > > #ifdef CONFIG_PREEMPT_RT_FULL, printk() output is never flushed by > printk() because: > ... > > On system boot some printk() output is flushed because register_console() > and tty_open() call console_unlock(). > > This change also fixes the problem that was previously fixed by > preempt-rt-allow-immediate-magic-sysrq-output-for-preempt_rt_full.patch > > Signed-off-by: Frank Rowand <frank.rowand <at> am.sony.com> > > --- > kernel/printk.c | 2 1 + 1 - 0 ! > 1 file changed, 1 insertion(+), 1 deletion(-) > > Index: b/kernel/printk.c > =================================================================== > --- a/kernel/printk.c > +++ b/kernel/printk.c > @@ -847,7 +847,7 @@ static int console_trylock_for_printk(un > int retval = 0, wake = 0; > #ifdef CONFIG_PREEMPT_RT_FULL > int lock = !early_boot_irqs_disabled && !irqs_disabled_flags(flags) && > - !preempt_count(); > + (preempt_count() <= 1); > #else > int lock = 1; > #endif > >
I have seen that this patch is applied in the 3.4 stable rt series. As we are using the 3.0 stable rt kernel I have tested this patch on this kernel series (on a Freescale i.MX31 based board) and have not found any problems so far. Is there something I have missed why this patch has not found its way in the 3.0 series ?
Thanks in advance, Michael
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