linux-kernel - Re: [Patch 06/12] Use the new wrapper routines to access debug registers in process/thread code

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Message-ID: <20090528064238.GC3091@yookeroo.seuss>
Date:	Thu, 28 May 2009 16:42:38 +1000
From:	David Gibson <dwg@....ibm.com>
To:	"K.Prasad" <prasad@...ux.vnet.ibm.com>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Benjamin Herrenschmidt <benh@....ibm.com>,
	maneesh@...ux.vnet.ibm.com, Roland McGrath <roland@...hat.com>,
	Masami Hiramatsu <mhiramat@...hat.com>
Subject: Re: [Patch 06/12] Use the new wrapper routines to access debug
	registers in process/thread code

On Mon, May 11, 2009 at 05:23:44PM +0530, K.Prasad wrote:
> From: Alan Stern <stern@...land.harvard.edu>
> 
> This patch enables the use of abstract debug registers in
> process-handling routines.

[snip]
>  
> +	p->thread.io_bitmap_ptr = NULL;

Why is manipulating the io_bitmap_ptr relevant to debug register
handling?

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson
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