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    SubjectRe: [PATCH] convert parisc to sparsemem (was Re: [PATCH v3] mm: make expand_downwards symmetrical to expand_upwards)
    Hi James,

    % make CROSS_COMPILE=hppa64-linux- ARCH=parisc
    CHK include/linux/version.h
    CHK include/generated/utsrelease.h
    CC arch/parisc/kernel/asm-offsets.s
    In file included from include/linux/topology.h:32:0,
    from include/linux/sched.h:78,
    from arch/parisc/kernel/asm-offsets.c:31:
    include/linux/mmzone.h:916:27: fatal error: asm/sparsemem.h: No such file or directory

    Parhaps, you forgot to quilt add?

    > This is the preliminary conversion. It's very nasty on parisc because
    > the memory allocation isn't symmetric anymore: under DISCONTIGMEM, we
    > push all memory into bootmem and then let free_all_bootmem() do the
    > magic for us; now we have to do separate initialisations for ranges
    > because SPARSEMEM can't do multi-range boot memory. It's also got the
    > horrible hack that I only use the first found range for bootmem. I'm
    > not sure if this is correct (it won't be if the first found range can be
    > under about 50MB because we'll run out of bootmem during boot) ... we
    > might have to sort the ranges and use the larges, but that will involve
    > us in even more hackery around the bootmem reservations code.
    > The boot sequence got a few seconds slower because now all of the loops
    > over our pfn ranges actually have to skip through the holes (which takes
    > time for 64GB).
    > All in all, I've not been very impressed with SPARSEMEM over
    > DISCONTIGMEM. It seems to have a lot of rough edges (necessitating
    > exception code) which DISCONTIGMEM just copes with.
    > And before you say the code is smaller, that's because I converted us to
    > generic show_mem().

    Cool! I hoped to remove arch specific show_mem() long time.

    And, nitpick comment.

    Could you please use #ifdef CONFIG_FLAGMEM instead #ifndef CONFIG_SPARSEMEM?
    MM gyes parse '#ifndef CONFIG_SPARSEMEM' as valid-both-flatmem-and-discontigmem.
    but this code isn't.

    If my quick grep is correct, all of your #ifndef SPARSEMEM can be converted
    #ifdef FALTMEM.

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