linux-kernel - Re: [PATCH] arm: remove unused code in delay.S

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Date:	Tue, 15 Sep 2009 12:37:39 +0200
From:	Pavel Machek <pavel@....cz>
To:	Felipe Contreras <felipe.contreras@...il.com>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Jamie Lokier <jamie@...reable.org>,
	Marek Vasut <marek.vasut@...il.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] arm: remove unused code in delay.S


> >> > Because then you get it whenever you configure for V4 as the lowest
> >> > denominator CPU, which leads to the buggy behaviour on better CPUs.
> >> > It's far better to leave it as is and just accept that the old CPUs
> >> > will have longer than necessary delays.  If people really really
> >> > care (and there's likely to only be a small minority of them now)
> >> > changing the '0' to a '1' is a very simple change for them to carry
> >> > in their local tree.  Unlike getting the right unrolling etc.
> >>
> >> Well, they can also 'git revert' this patch. If somebody really cares
> >> I think they should shout now and provide a better patch, otherwise
> >> this one should be merged.
> >
> > On the other hand, having the code there as it currently stands is not
> > harmful in any way, so leaving it there is just as easy.
> 
> It makes the code less understandable. I'm not sure about linux's
> practices, but an #if 0 generally means somebody is being lazy.

Not in this case, as you was explained to you. You may want to add
explaining comment above #if 0....
								Pavel

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