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

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Message-ID: <4E25221F.6060605@redhat.com>
Date:	Tue, 19 Jul 2011 14:20:15 +0800
From:	Cong Wang <amwang@...hat.com>
To:	Mel Gorman <mgorman@...e.de>
CC:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	Andi Kleen <andi@...stfloor.org>, linux-mm@...ck.org
Subject: Re: [Patch] mm: make CONFIG_NUMA depend on CONFIG_SYSFS

于 2011年07月18日 21:52, Mel Gorman 写道:
> On Mon, Jul 18, 2011 at 07:18:29PM +0800, Amerigo Wang 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.
>>
>
> That looks a bit awful. There is no obvious connection between SYSFS
> and NUMA. One is exporting information to userspace and the other is
> the memory model. Without sysfs, NUMA support might be less useful
> but the memory policies should still work and set_mempolicy() should
> still be an option.
>
> You didn't post where the buggy reference to vmstat_text but I'm
> assuming it is in drivers/base/node.c . It would be preferable that
> it be fixed to not reference vmstat_text unless either CONFIG_PROC_FS
> or CONFIG_SYSFS is defined similar to what is in mm/vmstat.c .
>

Hmm, since we don't have to enable SYSFS for NUMA, how about
make a new Kconfig for drivers/base/node.c? I.e., CONFIG_NUMA_SYSFS,
like patch below.

Thanks.

View attachment "numa-depends-on-sysfs.diff" of type "text/plain" (1337 bytes)