linux-kernel - Re: [PATCH] futex: split PI support to a file of its own

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Message-ID: <alpine.LFD.2.20.1708010011390.5981@knanqh.ubzr>
Date:   Tue, 1 Aug 2017 00:23:58 -0400 (EDT)
From:   Nicolas Pitre <nicolas.pitre@...aro.org>
To:     Thomas Gleixner <tglx@...utronix.de>
cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] futex: split PI support to a file of its own

On Mon, 31 Jul 2017, Thomas Gleixner wrote:

> But I really do not agree with your reasoning about easier to understand
> and maintain. I have the dubious pleasure to stare into that code on a
> regular base. PI and non PI share a lot of code and it's really not helping
> to have two separate files to stare at. That makes following the PI code
> even harder than it is already. So I rather like to see that PI code in an
> #ifdef block and not split out into its own file.

OK. And in fact I think I now managed to keep #ifdef's to a very small 
number, counting on dead code elimination instead.  Please see next 
patch.

> Please provide a diffstat along with the patch next time.

Hmmm... was supposed to be there.  For the record it was:

 include/linux/futex.h |    7 +-
 init/Kconfig          |    7 +-
 kernel/futex.c        | 1559 +-----------------------------------------
 kernel/futex_pi.c     | 1563 +++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 1598 insertions(+), 1538 deletions(-)

Admitedly not small. But when PI is disabled then futex.o shrinks by 
roughly the half of its original size. So a lot of code is dedicated to 
PI.


Nicolas