linux-kernel - Re: [PATCH] kernel/watchdog: use nmi registers snapshot in hardlockup handler

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Date:	Fri, 8 Jul 2016 14:02:45 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
Cc:	linux-kernel@...r.kernel.org, Jiri Kosina <jkosina@...e.cz>,
	Ulrich Obergfell <uobergfe@...hat.com>,
	Aaron Tomlin <atomlin@...hat.com>
Subject: Re: [PATCH] kernel/watchdog: use nmi registers snapshot in
 hardlockup handler

On Tue, 05 Jul 2016 14:20:47 +0300 Konstantin Khlebnikov <khlebnikov@...dex-team.ru> wrote:

> NMI handler doesn't call set_irq_regs(), so get_irq_regs() returns NULL or
> stale snapshot from beginning of IRQ interrupted by NMI. Registers from
> argument are always here and points to interrupted instruction and state.

Changelog is quite poor.  Please send along a new one which describes
in full detail how this patch alters kernel behaviour.

Such a description will help others decide whether their kernel might
need this patch and permits others to decide which kernel versions need
the fix.