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Date:   Thu, 28 Dec 2017 03:31:27 -0800
From:   tip-bot for Guenter Roeck <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     mingo@...nel.org, linux@...ck-us.net, joe@...ches.com,
        andriy.shevchenko@...ux.intel.com, dtor@...omium.org,
        linux-kernel@...r.kernel.org, mika.westerberg@...ux.intel.com,
        tglx@...utronix.de, hpa@...or.com
Subject: [tip:irq/urgent] genirq: Guard handle_bad_irq log messages

Commit-ID:  11bca0a83f83f6093d816295668e74ef24595944
Gitweb:     https://git.kernel.org/tip/11bca0a83f83f6093d816295668e74ef24595944
Author:     Guenter Roeck <linux@...ck-us.net>
AuthorDate: Sat, 2 Dec 2017 09:13:04 -0800
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Thu, 28 Dec 2017 12:28:29 +0100

genirq: Guard handle_bad_irq log messages

An interrupt storm on a bad interrupt will cause the kernel
log to be clogged.

[   60.089234] ->handle_irq():  ffffffffbe2f803f,
[   60.090455] 0xffffffffbf2af380
[   60.090510] handle_bad_irq+0x0/0x2e5
[   60.090522] ->irq_data.chip(): ffffffffbf2af380,
[   60.090553]    IRQ_NOPROBE set
[   60.090584] ->handle_irq():  ffffffffbe2f803f,
[   60.090590] handle_bad_irq+0x0/0x2e5
[   60.090596] ->irq_data.chip(): ffffffffbf2af380,
[   60.090602] 0xffffffffbf2af380
[   60.090608] ->action():           (null)
[   60.090779] handle_bad_irq+0x0/0x2e5

This was seen when running an upstream kernel on Acer Chromebook R11.  The
system was unstable as result.

Guard the log message with __printk_ratelimit to reduce the impact.  This
won't prevent the interrupt storm from happening, but at least the system
remains stable.

Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Dmitry Torokhov <dtor@...omium.org>
Cc: Joe Perches <joe@...ches.com>
Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: Mika Westerberg <mika.westerberg@...ux.intel.com>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=197953
Link: https://lkml.kernel.org/r/1512234784-21038-1-git-send-email-linux@roeck-us.net

---
 kernel/irq/debug.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/kernel/irq/debug.h b/kernel/irq/debug.h
index 17f05ef..e4d3819 100644
--- a/kernel/irq/debug.h
+++ b/kernel/irq/debug.h
@@ -12,6 +12,11 @@
 
 static inline void print_irq_desc(unsigned int irq, struct irq_desc *desc)
 {
+	static DEFINE_RATELIMIT_STATE(ratelimit, 5 * HZ, 5);
+
+	if (!__ratelimit(&ratelimit))
+		return;
+
 	printk("irq %d, desc: %p, depth: %d, count: %d, unhandled: %d\n",
 		irq, desc, desc->depth, desc->irq_count, desc->irqs_unhandled);
 	printk("->handle_irq():  %p, ", desc->handle_irq);

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