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    SubjectRe: 2.6.24-rc3-mm1
    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.

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