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From: Pingfan Liu <kernelfans@gmail.com>
Subject: [PATCH 0/3] warn and suppress irqflood
Date: Thu, 22 Oct 2020 13:56:00 +0800
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To: linux-kernel@vger.kernel.org
Cc: Maulik Shah <mkshah@codeaurora.org>, Petr Mladek <pmladek@suse.com>, Oliver Neukum <oneukum@suse.com>, "Gustavo A. R. Silva" <gustavo@embeddedor.com>, Peter Zijlstra <peterz@infradead.org>, Marc Zyngier <maz@kernel.org>, Linus Walleij <linus.walleij@linaro.org>, "Guilherme G. Piccoli" <gpiccoli@canonical.com>, linux-doc@vger.kernel.org, Jonathan Corbet <corbet@lwn.net>, Pingfan Liu <kernelfans@gmail.com>, Jisheng Zhang <Jisheng.Zhang@synaptics.com>, Pawan Gupta <pawan.kumar.gupta@linux.intel.com>, Lina Iyer <ilina@codeaurora.org>, kexec@lists.infradead.org, Thomas Gleixner <tglx@linutronix.de>, Mike Kravetz <mike.kravetz@oracle.com>, afzal mohammed <afzal.mohd.ma@gmail.com>, Andrew Morton <akpm@linux-foundation.org>, Al Viro <viro@zeniv.linux.org.uk>

I hit a irqflood bug on powerpc platform, and two years ago, on a x86 platform.
When the bug happens, the kernel is totally occupies by irq.  Currently, there
may be nothing or just soft lockup warning showed in console. It is better
to warn users with irq flood info.

In the kdump case, the kernel can move on by suppressing the irq flood.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: "Guilherme G. Piccoli" <gpiccoli@canonical.com>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: afzal mohammed <afzal.mohd.ma@gmail.com>
Cc: Lina Iyer <ilina@codeaurora.org>
Cc: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
Cc: Maulik Shah <mkshah@codeaurora.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Oliver Neukum <oneukum@suse.com>
To: linux-kernel@vger.kernel.org
Cc: linux-doc@vger.kernel.org
Cc: kexec@lists.infradead.org

Pingfan Liu (3):
  kernel/watchdog: show irq percentage if irq floods
  kernel/watchdog: suppress max irq when irq floods
  Documentation: introduce a param "irqflood_suppress"

 Documentation/admin-guide/kernel-parameters.txt |  3 ++
 include/linux/irq.h                             |  2 ++
 kernel/irq/spurious.c                           | 32 +++++++++++++++++
 kernel/watchdog.c                               | 48 +++++++++++++++++++++++++
 4 files changed, 85 insertions(+)

-- 
2.7.5


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