linux-kernel - Re: [-mm patch] #if 0 mm/backing-dev.c:congestion_wait

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Date:	Fri, 15 Jun 2007 17:31:37 +0200
From:	"Jesper Juhl" <jesper.juhl@...il.com>
To:	"Adrian Bunk" <bunk@...sta.de>
Cc:	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>,
	"Trond Myklebust" <trond.myklebust@....uio.no>,
	linux-kernel@...r.kernel.org
Subject: Re: [-mm patch] #if 0 mm/backing-dev.c:congestion_wait_interruptible()

On 13/06/07, Adrian Bunk <bunk@...sta.de> wrote:
> On Tue, Jun 12, 2007 at 02:40:06PM +0200, Jesper Juhl wrote:
> > On 12/06/07, Adrian Bunk <bunk@...sta.de> wrote:
> >> congestion_wait_interruptible() is no longer used.
> >>
> > Remind me again why it is that we add all these  #if 0  blocks instead
> > of simply removing the unused code?
> >
> > It's just creating a janitorial task to go and remove all the #if 0
> > bits at a later time, seems like pointless churn to me. If the code
> > needs to go, let's just get rid of it in one go instead of two.
>
> The #if 0 also handles all "I want to use this code in 6 months"
> comments that might come (and in some rare cases it even gets used
> later).
>
Well, if it is going to be used in 6 months it's just as easy to add
the code back at that point as it is to remove the  #if 0  bits. Or
simply not remove it in the first place - if it's going to be used in
6 months, all we gain from  #if 0  is slightly smaller binary size for
6 months ... a bit pointless don't you think?

> My primary intention is to remove dead code from bloating the kernel
> image, and this way the probability of patch acceptance is higher.
>
I have no objections to removing dead code. That's a fine objective.
My only concern is that eventually we'll be left with a mountain of
code inside  #if 0  that noone ever cleans up.

I guess I could start grep'ing the surce for "#if 0" at regular
intervals and removing any instances that were added >6months ago...
Something inside me just screams that I shouldn't have to :-)

-- 
Jesper Juhl <jesper.juhl@...il.com>
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