linux-kernel - Problems with Kconfig select across directories

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Date:	Fri, 14 Oct 2011 16:35:45 +0200
From:	Boaz Harrosh <bharrosh@...asas.com>
To:	Michal Marek <mmarek@...e.cz>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Trond Myklebust <Trond.Myklebust@...app.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	NFS list <linux-nfs@...r.kernel.org>
Subject: Problems with Kconfig select across directories

I have this weird problem with Kconfig.

In fs/exofs/Kconfig I have:

# Library to be selected by users
config ORE
	tristate

Then
config EXOFS_FS
	tristate "exofs: OSD based file system support"
	depends on SCSI_OSD_ULD
	select ORE
	help ...

So far so good. Choosing EXOFS_FS in xmenuconfig works fine as expected.
But now I add another user say: (It's more complicated but even below does
not work)

config NFS_FS
	tristate "NFS client support"
	depends on INET && FILE_LOCKING
	select LOCKD
	select SUNRPC
	select NFS_ACL_SUPPORT if NFS_V3_ACL
	select ORE
	help ...

This does not work. The ORE is not compiled and MODPOST complains.
(Given EXOFS_FS is not selected since then it will work)

What am I doing wrong? Why can't I "select" in fs/nfs/Kconfig
an option in fs/exofs/Kconfig? What can I do different?

Thanks
Boaz
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