From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Woodhouse Subject: Re: [patch 0/4] [resend] Add configuration options to disable features Date: Thu, 31 Jul 2008 20:55:34 +0100 Message-ID: <1217534134.3454.300.camel@pmac.infradead.org> References: <200807311850.m6VIoqCE015883@arbas.nms.ulrich-teichert.org> <1217533588.2328.1.camel@localhost.localdomain> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1217533588.2328.1.camel@localhost.localdomain> Sender: linux-embedded-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii" To: Josh Boyer Cc: Ulrich Teichert , Tim Bird , David Miller , torvalds@linux-foundation.org, thomas.petazzoni@free-electrons.com, linux-kernel@vger.kernel.org, linux-embedded@vger.kernel.org, michael@free-electrons.com 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