linux-kernel - Re: [patch 0/4] [resend] Add configuration options to disable features

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Date:	Thu, 31 Jul 2008 20:55:34 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	Josh Boyer <jwboyer@...il.com>
Cc:	Ulrich Teichert <krypton@...ich-teichert.org>,
	Tim Bird <tim.bird@...sony.com>,
	David Miller <davem@...emloft.net>,
	torvalds@...ux-foundation.org, thomas.petazzoni@...e-electrons.com,
	linux-kernel@...r.kernel.org, linux-embedded@...r.kernel.org,
	michael@...e-electrons.com
Subject: Re: [patch 0/4] [resend] Add configuration options to disable
	features

On Thu, 2008-07-31 at 15:46 -0400, Josh Boyer wrote:
> On Thu, 2008-07-31 at 20:50 +0200, Ulrich Teichert wrote:
> > Hi,
> > 
> > >I don't know of any embedded products that ship with NTP turned
> > >on.
> > 
> > Well, I do. To be exact, I've developed parts of it. But it's numbers
> > are only into the thousands, so that makes it insignificant ;-)
> > 
> > >It's best to assume, with embedded, that we're not shipping
> > >ANY of the desktop or server applications you are familiar with.
> > >Absent those, does something break in the kernel with multicast
> > >support when IGMP is turned off?
> > 
> > I do not think of NTP as desktop or server application, but that's
> > probably just me,
> 
> No, it's not just you.  NTP is useful in cases where things do care
> about time but hardware designers were too cheap to put an RTC on the
> board.
> 
> I will admit that it's use in embedded products is probably very limited
> though.

NTP is a red herring. It has a check for multicast support in its
configure script and wraps it all in #ifdef MCAST anyway.

So even if it _does_ crap out when I build my standard distro kernel
with !CONFIG_IGMP and use the standard distro build of ntpd, that still
isn't particularly relevant to the kind of application where someone
would built a kernel without IGMP support and build their own ntpd to
match.

-- 
dwmw2

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