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Date: Mon, 18 Aug 2008 15:28:41 -0400 (EDT)
From: Steven Rostedt <rostedt@goodmis.org>
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To: Scott Wood <scottwood@freescale.com>
cc: Eran Liberty <liberty@extricom.com>,
       Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>,
       linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org,
       Steven Rostedt <srostedt@redhat.com>,
       "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Subject: Re: ftrace introduces instability into kernel 2.6.27(-rc2,-rc3)
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On Mon, 18 Aug 2008, Scott Wood wrote:

> Steven Rostedt wrote:
> > What syntax to do that with?
> > 
> >   lwz %1,0(%U2)
> >   stu %3, 0(%X2)
> > 
> > I'm new to those. (and the above does not compile)
> 
> lwz%U2%X2 %1, %2
> stw%U2%X2 %3, %2

Thanks, that's new to me.

> 
> > > Why stwu with an offset of zero,
> > 
> > How else to do it?  stwu %3, (%2) does not compile for me.
> 
> stw %3, 0(%2)
> 
> The "u" tells it to write the effective address back to %2 -- but with an
> offset of zero, the effective address is unchanged.

Ah! Right!

/me should open up his PowerPC ref books again :-p

-- Steve