linux-kernel - Re: [RFC] hwbkpt: Hardware breakpoints (was Kwatch)

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Message-ID: <20070313130755.21d32627@lxorguk.ukuu.org.uk>
Date:	Tue, 13 Mar 2007 13:07:55 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Roland McGrath <roland@...hat.com>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Prasanna S Panchamukhi <prasanna@...ibm.com>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] hwbkpt: Hardware breakpoints (was Kwatch)

On Tue, 13 Mar 2007 01:00:50 -0700 (PDT)
Roland McGrath <roland@...hat.com> wrote:

> > Well, I can add in the test for 0, but finding the set of always-on bits
> > in DR6 will have to be done separately.  Isn't it possible that different
> > CPUs could have different bits?
> 
> I don't know, but it seems unlikely.  AFAIK all CPUs are presumed to have
> the same CPUID results, for example.

No. We merge the CPUID information to get a shared set of capability bits.

Generic PC systems with a mix of PII and PIII are possible. The voyager
architecture can have even more peculiar combinations of processor
modules installed.

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