2018-08-27 14:32:32 +00:00
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Subject: rt: Improve the serial console PASS_LIMIT
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From: Ingo Molnar <mingo@elte.hu>
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Date: Wed Dec 14 13:05:54 CET 2011
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2019-02-27 18:51:46 +00:00
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.25-rt16.tar.xz
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2018-08-27 14:32:32 +00:00
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Beyond the warning:
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drivers/tty/serial/8250/8250.c:1613:6: warning: unused variable ‘pass_counter’ [-Wunused-variable]
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the solution of just looping infinitely was ugly - up it to 1 million to
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give it a chance to continue in some really ugly situation.
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Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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---
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drivers/tty/serial/8250/8250_core.c | 11 ++++++++++-
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1 file changed, 10 insertions(+), 1 deletion(-)
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--- a/drivers/tty/serial/8250/8250_core.c
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+++ b/drivers/tty/serial/8250/8250_core.c
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@@ -54,7 +54,16 @@ static struct uart_driver serial8250_reg
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static unsigned int skip_txen_test; /* force skip of txen test at init time */
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-#define PASS_LIMIT 512
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+/*
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+ * On -rt we can have a more delays, and legitimately
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+ * so - so don't drop work spuriously and spam the
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+ * syslog:
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+ */
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+#ifdef CONFIG_PREEMPT_RT_FULL
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+# define PASS_LIMIT 1000000
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+#else
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+# define PASS_LIMIT 512
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+#endif
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#include <asm/serial.h>
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/*
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