linux-kernel - Re: RFC: deprecate CONFIG_X86_CPU_DEBUG and schedule it for rapid removal

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Date:	Sat, 23 Jan 2010 06:22:57 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Ozan ??a??layan <ozan@...dus.org.tr>,
	Yinghai Lu <yinghai@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	a.p.zijlstra@...llo.nl, stable@...nel.org,
	Jaswinder Singh Rajput <jaswinder@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: RFC: deprecate CONFIG_X86_CPU_DEBUG and schedule it for rapid
 removal


* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> On Fri, 22 Jan 2010, Andrew Morton wrote:
> > 
> > We know that enabling this feature will cause some machines to hang,
> > and that this problem has existed for six months.
> > 
> > Would it not be better to fix that problem (perhaps just with the
> > revert) so that 2.6.33, 2.6.32.x and earlier can be fixed?  Then we can
> > nuke the feature in 2.6.34.
> 
> Another way of looking at is "we know it's been broken for six months, and 
> clearly nobody really ever enabled it in any distro, and even getting a bug 
> report on it took forever. So why keep it around at all"?
> 
> So I'd personally rather just remove it outright than deprecate it or even 
> try to fix it. Since clearly absolutely nobody depends on it.
> 
> The usual reason for deprecating a feature is to give people time to move 
> away from it, but since clearly nobody uses it...

Excellent - that makes it all even simpler to handle.

	Ingo
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