linux-kernel - Re: [RFC Patch 3/9] Modifying generic debug exception to use virtual debug registers

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Message-Id: <20081017232745.789551544CB@magilla.localdomain>
Date:	Fri, 17 Oct 2008 16:27:45 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Alan Stern <stern@...land.harvard.edu>, prasad@...ux.vnet.ibm.com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	<akpm@...ux-foundation.org>, <mingo@...e.hu>,
	<jason.wessel@...driver.com>, <avi@...ranet.com>,
	<richardj_moore@...ibm.com>
Subject: Re: [RFC Patch 3/9] Modifying generic debug exception to use virtual
 debug registers

> kprobes stays as it, returns NOTIFY_STOP iff it's swallowing the step.

Oops, I think this breaks if there was also a ptrace db[0-3] hit in the
same exception.  In that case, kprobes would need to not return NOTIFY_STOP
when it otherwise would, if thread.vdr6 has low bits set.


Thanks,
Roland
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