52 lines
1.8 KiB
Diff
52 lines
1.8 KiB
Diff
From 7c89ab27e0ed2ad5af47ddd8275cf32c681b64d1 Mon Sep 17 00:00:00 2001
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Message-Id: <7c89ab27e0ed2ad5af47ddd8275cf32c681b64d1.1601675152.git.zanussi@kernel.org>
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In-Reply-To: <5b5a156f9808b1acf1205606e03da117214549ea.1601675151.git.zanussi@kernel.org>
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References: <5b5a156f9808b1acf1205606e03da117214549ea.1601675151.git.zanussi@kernel.org>
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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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Date: Thu, 19 May 2016 17:45:27 +0200
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Subject: [PATCH 207/333] kernel/printk: Don't try to print from IRQ/NMI region
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.148-rt64.tar.xz
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On -RT we try to acquire sleeping locks which might lead to warnings
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from lockdep or a warn_on() from spin_try_lock() (which is a rtmutex on
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RT).
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We don't print in general from a IRQ off region so we should not try
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this via console_unblank() / bust_spinlocks() as well.
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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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---
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kernel/printk/printk.c | 10 ++++++++++
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1 file changed, 10 insertions(+)
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diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
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index 1eb212298f95..c5fbc51e61ed 100644
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--- a/kernel/printk/printk.c
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+++ b/kernel/printk/printk.c
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@@ -1817,6 +1817,11 @@ static void call_console_drivers(const char *ext_text, size_t ext_len,
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if (!console_drivers)
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return;
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+ if (IS_ENABLED(CONFIG_PREEMPT_RT_BASE)) {
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+ if (in_irq() || in_nmi())
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+ return;
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+ }
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+
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migrate_disable();
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for_each_console(con) {
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if (exclusive_console && con != exclusive_console)
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@@ -2583,6 +2588,11 @@ void console_unblank(void)
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{
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struct console *c;
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+ if (IS_ENABLED(CONFIG_PREEMPT_RT_BASE)) {
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+ if (in_irq() || in_nmi())
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+ return;
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+ }
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+
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/*
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* console_unblank can no longer be called in interrupt context unless
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* oops_in_progress is set to 1..
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--
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2.17.1
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