Subject: rt: Improve the serial console PASS_LIMIT From: Ingo Molnar Date: Wed Dec 14 13:05:54 CET 2011 Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.1-rt3.tar.xz Beyond the warning: drivers/tty/serial/8250/8250.c:1613:6: warning: unused variable ‘pass_counter’ [-Wunused-variable] the solution of just looping infinitely was ugly - up it to 1 million to give it a chance to continue in some really ugly situation. Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- drivers/tty/serial/8250/8250_core.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -54,7 +54,16 @@ static struct uart_driver serial8250_reg static unsigned int skip_txen_test; /* force skip of txen test at init time */ -#define PASS_LIMIT 512 +/* + * On -rt we can have a more delays, and legitimately + * so - so don't drop work spuriously and spam the + * syslog: + */ +#ifdef CONFIG_PREEMPT_RT_FULL +# define PASS_LIMIT 1000000 +#else +# define PASS_LIMIT 512 +#endif #include /*