linux-kernel - Re: [Patch] mm: make CONFIG_NUMA depend on CONFIG

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Message-Id: <20110718101435.14c38ae7.rdunlap@xenotime.net>
Date:	Mon, 18 Jul 2011 10:14:35 -0700
From:	Randy Dunlap <rdunlap@...otime.net>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Pekka Enberg <penberg@...nel.org>,
	Amerigo Wang <amwang@...hat.com>, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, Mel Gorman <mgorman@...e.de>,
	linux-mm@...ck.org
Subject: Re: [Patch] mm: make CONFIG_NUMA depend on CONFIG_SYSFS

On Mon, 18 Jul 2011 19:09:50 +0200 Andi Kleen wrote:

> On Mon, Jul 18, 2011 at 03:14:18PM +0300, Pekka Enberg wrote:
> > On Mon, Jul 18, 2011 at 2:18 PM, Amerigo Wang <amwang@...hat.com> wrote:
> > > On ppc, we got this build error with randconfig:
> > >
> > > drivers/built-in.o:(.toc1+0xf90): undefined reference to `vmstat_text': 1 errors in 1 logs
> > >
> > > This is due to that it enabled CONFIG_NUMA but not CONFIG_SYSFS.
> > >
> > > And the user-space tool numactl depends on sysfs files too.
> > > So, I think it is very reasonable to make CONFIG_NUMA depend on CONFIG_SYSFS.
> > 
> > Is it? CONFIG_NUMA is useful even without userspace numactl tool, no?
> 
> Yes it is. No direct dependency.
> 
> I would rather fix it in ppc.

This isn't a ppc-only error.  It happens when CONFIG_PROC_FS is not enabled
(or is it CONFIG_SYSFS?).

I reported it for linux-next of 20110526:

when CONFIG_PROC_FS is not enabled:

drivers/built-in.o: In function `node_read_vmstat':
node.c:(.text+0x56ffa): undefined reference to `vmstat_text'


---
~Randy
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