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rt: Improve the serial console PASS_LIMIT 

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 <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Ingo Molnar 2011-12-14 13:05:54 +01:00 committed by Alibek Omarov
parent 9e1befb3d6
commit 797bad0fa7
1 changed files with 10 additions and 1 deletions
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11
drivers/tty/serial/8250/8250_core.c
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@ -80,7 +80,16 @@ static unsigned int skip_txen_test; /* force skip of txen test at init time */
#define DEBUG_INTR(fmt...) do { } while (0)
#endif
#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
#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)