linux-kernel - Re: + clocksource-initialize-list-value.patch added to -mm tree

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Message-Id: <1160318579.3693.8.camel@c-67-180-230-165.hsd1.ca.comcast.net>
Date:	Sun, 08 Oct 2006 07:42:59 -0700
From:	Daniel Walker <dwalker@...sta.com>
To:	tglx@...utronix.de
Cc:	akpm@...l.org, johnstul@...ibm.com, mingo@...e.hu,
	zippel@...ux-m68k.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: + clocksource-initialize-list-value.patch added to -mm tree

On Sun, 2006-10-08 at 11:50 +0200, Thomas Gleixner wrote:
> On Fri, 2006-10-06 at 18:53 -0700, akpm@...l.org wrote:
> > A change to clocksource initialization.  It's optional for new clocksources,
> > but prefered.  If the list field is initialized it allows clocksource_register
> > to complete faster since it doesn't have the scan the list of clocks doing
> > strcmp on each.
> 
> Either make it required or not.

This is for compatability with all those clocksources people are writing
that just haven't been released (assuming they will be eventually
released). I would love to make this required.

> > diff -puN arch/i386/kernel/hpet.c~clocksource-initialize-list-value arch/i386/kernel/hpet.c
> > --- a/arch/i386/kernel/hpet.c~clocksource-initialize-list-value
> > +++ a/arch/i386/kernel/hpet.c
> > @@ -27,6 +27,7 @@ static struct clocksource clocksource_hp
> >  	.mult		= 0, /* set below */
> >  	.shift		= HPET_SHIFT,
> >  	.is_continuous	= 1,
> > +	.list		= CLOCKSOURCE_LIST_INIT(clocksource_hpet.list),
> ... 
> > +/* Abstracted list initialization */
> > +#define CLOCKSOURCE_LIST_INIT(x)	LIST_HEAD_INIT(x)
> > +
> 
> Please use LIST_HEAD_INIT(). This is not an abstraction, this is an
> obfuscation. 

The reason it's there is to make the list->plist or plist->list
transition easier. I'd be happy to remove when I feel that's settled,
which may be right now.

Daniel

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