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    SubjectRe: [PATCH] Tight check of pfn_valid on sparsemem - v4
    On Tue, Jul 27, 2010 at 11:34 PM, Christoph Lameter
    <> wrote:
    > On Tue, 27 Jul 2010, Minchan Kim wrote:
    >> But in fact I have a concern to use PG_reserved since it can be used
    >> afterward pfn_valid normally to check hole in non-hole system. So I
    >> think it's redundant.

    Ignore me. I got confused.

    > PG_reserved is already used to mark pages not handled by the page
    > allocator (see mmap_init_zone).

    I will resend below approach.

    static inline int memmap_valid(unsigned long pfn)
    struct page *page = pfn_to_page(pfn);
    struct page *__pg = virt_to_page(page);
    return page_private(__pg) == MAGIC_MEMMAP && PageReserved(__pg);

    Thanks, all.

    Kind regards,
    Minchan Kim

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