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    Subject[PATCH 5/5] lumpy: only check for valid pages when holes are present

    We only need to check that each page is valid with pfn_valid when
    we are on an architecture which had holes within zones. Make this
    check conditional.

    Signed-off-by: Andy Whitcroft <>
    diff --git a/mm/vmscan.c b/mm/vmscan.c
    index bef7e92..f249ad7 100644
    --- a/mm/vmscan.c
    +++ b/mm/vmscan.c
    @@ -725,9 +725,11 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
    /* The target page is in the block, ignore it. */
    if (unlikely(pfn == page_pfn))
    /* Avoid holes within the zone. */
    if (unlikely(!pfn_valid(pfn)))

    cursor_page = pfn_to_page(pfn);
    /* Check that we have not crossed a zone boundary. */
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      Last update: 2007-02-27 20:39    [W:0.018 / U:50.240 seconds]
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