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Date: Tue, 23 Aug 2011 14:57:56 +0530
From: "K.Prasad" <prasad@linux.vnet.ibm.com>
To: linuxppc-dev@ozlabs.org, Thiago Jung Bauermann <bauerman@br.ibm.com>,
	Edjunior Barbosa Machado <emachado@linux.vnet.ibm.com>
Subject: Re: [PATCH 2/2] [PowerPC Book3E] Introduce new ptrace debug feature
	flag
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On Tue, Aug 23, 2011 at 03:09:31PM +1000, David Gibson wrote:
> On Fri, Aug 19, 2011 at 01:23:38PM +0530, K.Prasad wrote:
> > 
> > While PPC_PTRACE_SETHWDEBUG ptrace flag in PowerPC accepts
> > PPC_BREAKPOINT_MODE_EXACT mode of breakpoint, the same is not intimated to the
> > user-space debuggers (like GDB) who may want to use it. Hence we introduce a
> > new PPC_DEBUG_FEATURE_DATA_BP_EXACT flag which will be populated on the
> > "features" member of "struct ppc_debug_info" to advertise support for the
> > same on Book3E PowerPC processors.
> 
> I thought the idea was that the BP_EXACT mode was the default - if the
> new interface was supported at all, then BP_EXACT was always
> supported.  So, why do you need a new flag?
> 

Yes, BP_EXACT was always supported but not advertised through
PPC_PTRACE_GETHWDBGINFO. We're now doing that.

Thanks,
K.Prasad