linux-kernel - Re: [PATCH v2 13/25] powerpc/8xx: also use r3 in the ITLB miss in all situations

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Message-ID: <1444150089.5336.283.camel@freescale.com>
Date:	Tue, 6 Oct 2015 11:48:09 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Christophe Leroy <christophe.leroy@....fr>
CC:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	<linux-kernel@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH v2 13/25] powerpc/8xx: also use r3 in the ITLB miss in
 all situations

On Tue, 2015-10-06 at 16:12 +0200, Christophe Leroy wrote:
> Le 29/09/2015 02:00, Scott Wood a écrit :
> > On Tue, Sep 22, 2015 at 06:50:54PM +0200, Christophe Leroy wrote:
> > > We are spending between 40 and 160 cycles with a mean of 65 cycles
> > > in the TLB handling routines (measured with mftbl) so make it more
> > > simple althought it adds one instruction
> > > 
> > > Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
> > > ---
> > > No change in v2
> > > 
> > >   arch/powerpc/kernel/head_8xx.S | 15 ++++-----------
> > >   1 file changed, 4 insertions(+), 11 deletions(-)
> > Why is this a separate patch from 1/25?
> > 
> > Same comments as on that patch.
> > 
> > 
> Just because here there is no real need behind the simplification of the 
> code, whereas the first one was a pre-requisite for the following patch.
> Should I merge them together anyway ?

If there's no real need, why do it?  It's not really a major readability 
enhancement...

-Scott

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