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SubjectRe: [PATCH RT 2/2] fix printk flush of messages
Date
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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