linux-kernel - Re: [PATCH 2/2] [POWERPC] uprobes: powerpc port

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Date:	Fri, 08 Jun 2012 16:38:17 +1000
From:	Michael Ellerman <michael@...erman.id.au>
To:	ananth@...ibm.com
Cc:	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>, oleg@...hat.com,
	lkml <linux-kernel@...r.kernel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Anton Blanchard <anton@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 2/2] [POWERPC] uprobes: powerpc port

On Fri, 2012-06-08 at 11:49 +0530, Ananth N Mavinakayanahalli wrote:
> On Fri, Jun 08, 2012 at 04:17:44PM +1000, Michael Ellerman wrote:
> > On Fri, 2012-06-08 at 11:31 +0530, Ananth N Mavinakayanahalli wrote:
> > > On Fri, Jun 08, 2012 at 03:51:54PM +1000, Michael Ellerman wrote:
> > > > On Fri, 2012-06-08 at 10:06 +0530, Ananth N Mavinakayanahalli wrote:
> > > 
> > > But MSR_PR=1 and hence emulate_step() will return -1 and hence we will
> > > end up single-stepping using user_enable_single_step(). Same with rfid.
> > 
> > Right. But that was exactly Jim's point, you may be asked to emulate
> > those instructions even though you wouldn't expect to see them in
> > userspace code, so you need to handle it.
> > 
> > Luckily it looks like emulate_step() will do the right thing for you.
> > It'd be good to test it to make 100% sure.
> 
> Sure. Will add that check and send v2.

Sorry I didn't mean add a test in the code, I meant construct a test
case to confirm that it works as expected.

cheers


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