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    SubjectRe: [PATCH] mm: memory hotplug: Check if pages are correctly reserved on a per-section basis
    On Mon, 17 Oct 2011, Mel Gorman wrote:

    > (Resending as I am not seeing it in -next so maybe it got lost)
    >
    > mm: memory hotplug: Check if pages are correctly reserved on a per-section basis
    >
    > It is expected that memory being brought online is PageReserved
    > similar to what happens when the page allocator is being brought up.
    > Memory is onlined in "memory blocks" which consist of one or more
    > sections. Unfortunately, the code that verifies PageReserved is
    > currently assuming that the memmap backing all these pages is virtually
    > contiguous which is only the case when CONFIG_SPARSEMEM_VMEMMAP is set.
    > As a result, memory hot-add is failing on those configurations with
    > the message;
    >
    > kernel: section number XXX page number 256 not reserved, was it already online?
    >
    > This patch updates the PageReserved check to lookup struct page once
    > per section to guarantee the correct struct page is being checked.
    >
    > [Check pages within sections properly: rientjes@google.com]
    > [original patch by: nfont@linux.vnet.ibm.com]
    > Signed-off-by: Mel Gorman <mgorman@suse.de>

    Acked-by: David Rientjes <rientjes@google.com>


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