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