linux-kernel - Re: Voyager phys_cpu_present

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Message-ID: <20080423085356.GB8723@ucw.cz>
Date:	Wed, 23 Apr 2008 10:53:57 +0200
From:	Pavel Machek <pavel@....cz>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Adrian Bunk <bunk@...nel.org>,
	Alexey Starikovskiy <astarikovskiy@...e.de>,
	tglx@...utronix.de, James.Bottomley@...senPartnership.com,
	linux-kernel@...r.kernel.org
Subject: Re: Voyager phys_cpu_present_map compile error

On Mon 2008-04-21 22:11:29, Ingo Molnar wrote:
> 
> * H. Peter Anvin <hpa@...or.com> wrote:
> 
> > Ingo Molnar wrote:
> >>
> >> sure - but no need to be rude and mark it BROKEN when we've got this much 
> >> better tool named "email". BROKEN is really just for cases where there's 
> >> no-one willing to fix things.
> >
> > I'm not trying to be rude, I'm just trying to avoid putting an 
> > unnecessary burden on testers and just let Kconfig know not to pick 
> > this particular random path.  Obviously, Kconfig doesn't care, but 
> > it's clear BROKEN has negative associations; besides, it really is 
> > unnecessarily strong.
> >
> > Perhaps what we need is NORAND?
> 
> yep, i was thinking about CONFIG_BROKEN2 already :-)
> 
> then i came up with: CONFIG_NON_GENERIC. All code that can break a 
> normal bootup should be marked with that. Such as CONFIG_ROOT_NFS=y 
> [panics on bootup] or CONFIG_EUROTECH_WDT=y [crashes on bootup] or 
> CONFIG_SND_MTPAV [hangs on bootup] and the dozens of other config 
> options i had to map when trying to bring up an allyesconfig kernel for 
> the first time ;-)

You certainly have my vote here. There's really big difference between
'this breaks boot when y (NFS_ROOT)' and 'this is mostly harmless when
y (any sane driver)'.

Actually in nfsroot case, we should probably fix the code so that it
is a nop w/out commandline option.

							Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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