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Re: [Xen-devel] Re: [PATCH] Remus breaks the build

To: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Subject: Re: [Xen-devel] Re: [PATCH] Remus breaks the build
From: Dulloor <dulloor@xxxxxxxxx>
Date: Fri, 13 Aug 2010 21:25:56 -0700
Cc: "Xen-devel@xxxxxxxxxxxxxxxxxxx" <Xen-devel@xxxxxxxxxxxxxxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>, Ian Campbell <Ian.Campbell@xxxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
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On Fri, Aug 13, 2010 at 2:14 PM, Jeremy Fitzhardinge <jeremy@xxxxxxxx> wrote:
>  On 08/13/2010 12:42 PM, Brendan Cully wrote:
>> I assume you're talking about this snippet of tools/remus/kmod/Makefile:
>> $(MAKE) -C $(KERNELDIR) SUBDIRS=`pwd` modules
>> which expects to find a Makefile in $KERNELDIR but does the actual
>> building in place, in the tools/remus/kmod directory (unless the
>> kernel build system has changed recently?). I thought this was a
>> pretty standard way to build out-of-tree kernel modules.
> I don't ever build the kernel out of the Xen tree.  In general, it
> assumes the kernel tree has already been configured and built, which may
> not be true if you're doing a parallel build, or if you're building the
> Xen tree piecewise.
>> I'm not sure why this is causing you problems (is it?), but if you're
>> willing to carry sch_queue in the pvops tree, I'd be happy to drop
>> tools/remus/kmod in the unstable tree.
> Yes, I'm happy to include it.  Do you have a git reference I can merge from?

My understanding is that we don't need any out-of-tree modules, if
linux is built with CONFIG_IFB.
Also, that IFB isn't something available on 2.6.18 (and maybe
2.6.27?), where we will need to build these modules.

Is that right ? And, if thats the case, isn't it better to fold these
drivers into 2.6.18 (2.6.27 ?) and
support Remus conditional on IFB for pvops tree ?

>    J
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