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    Subject[PATCH] sparsemem vmemmap: initialize memmap.
    From: Heiko Carstens <>

    Trying to online a new memory section that was added via memory hotplug
    results in lots of messages of pages in bad page state.
    Reason is that the alloacted virtual memmap isn't initialized.
    This is only an issue for memory sections that get added after boot
    time since for all other memmaps the bootmem allocator was used which
    returns only initialized memory.

    I noticed this on s390 which has its private vmemmap_populate function
    without using callbacks to the common code. But as far as I can see the
    generic code has the same bug, so fix it just once.

    Cc: Andy Whitcroft <>
    Cc: Christoph Lameter <>
    Cc: Gerald Schaefer <>
    Signed-off-by: Heiko Carstens <>
    mm/sparse-vmemmap.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    Index: linux-2.6/mm/sparse-vmemmap.c
    --- linux-2.6.orig/mm/sparse-vmemmap.c
    +++ linux-2.6/mm/sparse-vmemmap.c
    @@ -154,6 +154,6 @@ struct page * __meminit sparse_mem_map_p
    int error = vmemmap_populate(map, PAGES_PER_SECTION, nid);
    if (error)
    return NULL;
    + memset(map, 0, PAGES_PER_SECTION * sizeof(struct page));
    return map;

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      Last update: 2008-05-09 08:41    [W:0.021 / U:46.176 seconds]
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