linux-kernel - Re: [PATCH v2] Fix INT1 Exception with unregistered breakpoints

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Message-ID: <CAO6TR8Wz8p3425amCjpvBu4N8qfPzeRJ7MqoEoOabsNBd_wk8w@mail.gmail.com>
Date:	Mon, 14 Dec 2015 17:49:51 -0700
From:	Jeff Merkey <linux.mdb@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	x86@...nel.org, peterz@...radead.org, luto@...nel.org
Subject: Re: [PATCH v2] Fix INT1 Exception with unregistered breakpoints

On 12/14/15, Jeff Merkey <linux.mdb@...il.com> wrote:
> Please consider the attached patch.
>
> SUMMARY
>
> This patch corrects a hard lockup failure of the system kernel if the
> operating system receives a breakpoint exception at a code execution
> address which was not registered with the operating system.  The patch
> allows kernel debuggers, application profiling and performance modules,
> and external debugging tools to work better together at sharing the
> breakpoint registers on the platform in a way that they do not cause
> errors and system faults, and enables the full feature set in the
> breakpoint API.  If a kernel application triggers a breakpoint
> or programs one in error, this patch will catch the condition and report
> it to the system log without the operating system experiencing a system
> fault.  There are several consumers of the Linux Breakpoint API and all
> of them can and sometimes do cause the condition this patch corrects.
>

Peter,

Is that the type of summary that meets the standards.  I tried to be concise.

Jeff
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