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    Subject[PATCHv22 03/16] mm: compaction: introduce map_pages()
    From: Michal Nazarewicz <mina86@mina86.com>

    This commit creates a map_pages() function which map pages freed
    using split_free_pages(). This merely moves some code from
    isolate_freepages() so that it can be reused in other places.

    Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
    Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
    Acked-by: Mel Gorman <mel@csn.ul.ie>
    Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
    Tested-by: Robert Nelson <robertcnelson@gmail.com>
    ---
    mm/compaction.c | 15 +++++++++++----
    1 files changed, 11 insertions(+), 4 deletions(-)

    diff --git a/mm/compaction.c b/mm/compaction.c
    index 72f8685..de22893 100644
    --- a/mm/compaction.c
    +++ b/mm/compaction.c
    @@ -127,6 +127,16 @@ static bool suitable_migration_target(struct page *page)
    return false;
    }

    +static void map_pages(struct list_head *list)
    +{
    + struct page *page;
    +
    + list_for_each_entry(page, list, lru) {
    + arch_alloc_page(page, 0);
    + kernel_map_pages(page, 1, 1);
    + }
    +}
    +
    /*
    * Based on information in the current compact_control, find blocks
    * suitable for isolating free pages from and then isolate them.
    @@ -206,10 +216,7 @@ static void isolate_freepages(struct zone *zone,
    }

    /* split_free_page does not map the pages */
    - list_for_each_entry(page, freelist, lru) {
    - arch_alloc_page(page, 0);
    - kernel_map_pages(page, 1, 1);
    - }
    + map_pages(freelist);

    cc->free_pfn = high_pfn;
    cc->nr_freepages = nr_freepages;
    --
    1.7.1



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