forked from rrcarlosr/Jetpack
49 lines
1.4 KiB
Diff
49 lines
1.4 KiB
Diff
From 0195f7a7ae8a37569302be47adb1e44da4ed7042 Mon Sep 17 00:00:00 2001
|
|
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
|
|
Date: Thu, 19 May 2016 17:45:27 +0200
|
|
Subject: [PATCH 248/352] kernel/printk: Don't try to print from IRQ/NMI region
|
|
|
|
On -RT we try to acquire sleeping locks which might lead to warnings
|
|
from lockdep or a warn_on() from spin_try_lock() (which is a rtmutex on
|
|
RT).
|
|
We don't print in general from a IRQ off region so we should not try
|
|
this via console_unblank() / bust_spinlocks() as well.
|
|
|
|
Change-Id: Ib49792ab77e0096c4d6bf952bd65da344cbea79b
|
|
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
|
|
---
|
|
kernel/printk/printk.c | 10 ++++++++++
|
|
1 file changed, 10 insertions(+)
|
|
|
|
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
|
|
index 7d70671..7938094 100644
|
|
--- a/kernel/printk/printk.c
|
|
+++ b/kernel/printk/printk.c
|
|
@@ -1656,6 +1656,11 @@ static void call_console_drivers(int level,
|
|
if (!console_drivers)
|
|
return;
|
|
|
|
+ if (IS_ENABLED(CONFIG_PREEMPT_RT_BASE)) {
|
|
+ if (in_irq() || in_nmi())
|
|
+ return;
|
|
+ }
|
|
+
|
|
migrate_disable();
|
|
for_each_console(con) {
|
|
if (exclusive_console && con != exclusive_console)
|
|
@@ -2539,6 +2544,11 @@ void console_unblank(void)
|
|
{
|
|
struct console *c;
|
|
|
|
+ if (IS_ENABLED(CONFIG_PREEMPT_RT_BASE)) {
|
|
+ if (in_irq() || in_nmi())
|
|
+ return;
|
|
+ }
|
|
+
|
|
/*
|
|
* console_unblank can no longer be called in interrupt context unless
|
|
* oops_in_progress is set to 1..
|
|
--
|
|
2.7.4
|
|
|