linux-kernel - Re: [Patch] numa: introduce CONFIG_NUMA

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Date:	Thu, 25 Aug 2011 13:57:16 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Cong Wang <amwang@...hat.com>
cc:	Randy Dunlap <rdunlap@...otime.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>, gregkh@...e.de,
	linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	linux-mm@...ck.org
Subject: Re: [Patch] numa: introduce CONFIG_NUMA_SYSFS for
 drivers/base/node.c

On Thu, 25 Aug 2011, Cong Wang wrote:

> > No, it doesn't work, CONFIG_HUGETLBFS can be enabled with CONFIG_NUMA=y
> > and CONFIG_SYSFS=n and that uses data structures from drivers/base/node.c
> > which doesn't get compiled with this patch.
> 
> So, you mean with CONFIG_NUMA=y && CONFIG_SYSFS=n && CONFIG_HUGETLBFS=y
> we still get compile error?
> 
> Which data structures are used by hugetlbfs?
> 

node_states[], which is revealed at link time if you tried to compile your 
patch.  It's obvious that we don't want to add per-node hugetlbfs 
attributes to sysfs directories if sysfs is disabled, so you need to 
modify the hugetlbfs code as well.
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