linux-kernel - Re: maps2-move-the-page-walker-code-to-lib.patch

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Date:	Fri, 13 Jul 2007 22:48:17 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Matt Mackall <mpm@...enic.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: maps2-move-the-page-walker-code-to-lib.patch

On Tue, Jul 10, 2007 at 12:06:35PM +1000, Rusty Russell wrote:
> On Mon, 2007-07-09 at 15:22 -0500, Matt Mackall wrote:
> > On Sun, Jul 08, 2007 at 03:49:56PM +1000, Rusty Russell wrote:
> > > Matt wrote:
> > > > This lets it get shared outside of proc/ and linked in only when needed.
> > > 
> > > Erk, this really belongs in the mm dir.  You can use "lib-y +=
> > > pagewalk.o" there, and it seems to work as well as doing it in lib.
> > 
> > Are you sure? I tested that a few months ago and it didn't work for
> > me. I seem to recall it wanted a chunk of makefile surgery.
> 
> Well, I tested here and it worked unless I screwed something (producing
> lib.a in mm/ and linking it in).  And when I turned off all the CONFIG
> options which required it, the symbols disappeared from the vmlinux...

I think you had some additional change somewhere...
kbuild will only look for lib.a files (produced from all files
listed with lib-y _except_ files listed with obj-y too).

kbuild by default know about lib/ but almost all archs
add the directory: arch/$(ARCH)/lib but no-one
add mm/.
See assignment to libs-y.

Add see the bad documentation in Documentation/kbuild/makefiles.txt

	Sam
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