linux-kernel - Re: [GIT PULL v4.5] Fix INT1 recursion with unregistered breakpoints

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Message-ID: <CAO6TR8VW73E1Ho6zBicXBuSz1UNoKCDRL4voqZR+TUzXNdY=gw@mail.gmail.com>
Date:	Wed, 13 Jan 2016 09:28:51 -0700
From:	Jeff Merkey <linux.mdb@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andy Lutomirski <luto@...capital.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, X86 ML <x86@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Andy Lutomirski <luto@...nel.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Borislav Petkov <bp@...en8.de>, Jiri Olsa <jolsa@...nel.org>
Subject: Re: [GIT PULL v4.5] Fix INT1 recursion with unregistered breakpoints

On 1/11/16, Jeff Merkey <linux.mdb@...il.com> wrote:
> Anyway Andy,
>
> If Linus wants to pull it, be my guest -- I think its a bug.    If you
> guys want to wait that's ok too.  In the meantime, I totally agree
> that someone needs to fix the busted hw_breakpoint notify handling and
> I will focus on that.  I appreciate the opportunity to help out and
> thanks for suggesting some areas I can.
>
> Jeff
>

Linus,

OK, I have emailed Andy off line to ask about these other areas in
hw_breakpoint.c with the busted handlers he mentioned and gotten
no response (I guess he does not respond unless there's an audience).

I have other areas I am working on right now, including a new set of
changes from
the kbuild test robot for the debugger I have to get checked in and
regressed and other projects I am working on with Linux.  I submitted
this because its a bug, I think you should pull it until Thomas and
his team can come up with a better fix.    It's a squeaky clean patch
that has all of Thomas perks and suggestions.

As Thomas stated, the whole subsystem has some issues anyway because
of the way dr6 is handled.  I can fix this mess, but its a lot of work
and I am not going to attempt to do so if I am just going to submit a
patch series to folks and have them reject it for whatever reason.

In 18 years Linus I have never put a patch into Linux, this would be
my first.  I was really looking forward to finally getting one in.

:-)

Jeff