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Date: Mon, 26 Nov 2007 11:34:15 -0800 (PST)
From: Christoph Lameter <clameter@sgi.com>
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To: Randy Dunlap <randy.dunlap@oracle.com>
cc: Andrew Morton <akpm@linux-foundation.org>, linux-kernel@vger.kernel.org
Subject: Re: 2.6.24-rc3-mm1
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 <20071126111320.69d0aead.randy.dunlap@oracle.com>
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On Mon, 26 Nov 2007, Randy Dunlap wrote:

> On Tue, 20 Nov 2007 20:45:25 -0800 Andrew Morton wrote:
> 
> > 
> > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.24-rc3/2.6.24-rc3-mm1/
> 
> allnoconfig on x86_64 gives:
> 
> arch/x86/mm/init_64.c:84: error: implicit declaration of function 'pfn_valid'
> mm/page_alloc.c:2533: error: implicit declaration of function 'pfn_valid'
> mm/vmstat.c:518: error: implicit declaration of function 'pfn_valid'
> mm/memory.c:400: error: implicit declaration of function 'pfn_valid'
> drivers/char/mem.c:312: error: implicit declaration of function 'pfn_valid'

Hmmm... CONFIG_SPARSEMEM is not set if you do allnoconfig

config SPARSEMEM
        def_bool y
        depends on SPARSEMEM_MANUAL

So I guess we need to set SPARSEMEM_MANUAL

But arch/x86/Kconfig has

config SPARSEMEM_MANUAL
        bool "Sparse Memory"
        depends on ARCH_SPARSEMEM_ENABLE
        help
          This will be the only option for some systems, including
          memory hotplug systems.  This is normal.

It needs to be not deselectable for x86_64. 

Inserting

	def_bool y if X86_64

did not help....

Somehow make menuconfig did not give me an ability to even enable this 
again.