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From: Roland McGrath <roland@redhat.com>
To: Ingo Molnar <mingo@elte.hu>
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Cc: Alexey Dobriyan <adobriyan@gmail.com>, Oleg Nesterov <oleg@redhat.com>,
       akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
       containers@lists.linux-foundation.org
Subject: Re: [PATCH] x86: ptrace debugreg checks rewrite
In-Reply-To: Ingo Molnar's message of  Wednesday, 6 May 2009 11:56:29 +0200 <20090506095629.GC15323@elte.hu>
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Date: Wed,  6 May 2009 13:38:52 -0700 (PDT)
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> > On Mon, May 04, 2009 at 04:16:01AM +0400, Alexey Dobriyan wrote:
> > > +static int ptrace_check_debugreg(int _32bit,
> > > +				 unsigned long dr0, unsigned long dr1,
> > > +				 unsigned long dr2, unsigned long dr3,
> > > +				 unsigned long dr6, unsigned long dr7)
> > > +{
> > > +	/* Breakpoint type: 00: --x, 01: -w-, 10: undefined, 11: rw- */
> > > +	unsigned int rw[4];
> > > +	/* Breakpoint length: 00: 1 byte, 01: 2 bytes, 10: 8 bytes, 11: bytes */
> > 								        4 bytes, of course
> 
> Roland, Oleg, do you have any pending/planned changes in this area?

I don't.  I expect the only future work on this arch debugreg stuff to be
via the hw_breakpoint work, extending that and/or building new things on it.


Thanks,
Roland