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    Subject[PATCH 1/4] mm/migrate: correct return value of migrate_pages()
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    migrate_pages() should return number of pages not migrated or error code.
    When unmap_and_move return -EAGAIN, outer loop is re-execution without
    initialising nr_failed. This makes nr_failed over-counted.

    So this patch correct it by initialising nr_failed in outer loop.

    Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>

    diff --git a/mm/migrate.c b/mm/migrate.c
    index 3747fcd..1f59ccc 100644
    --- a/mm/migrate.c
    +++ b/mm/migrate.c
    @@ -1102,6 +1102,7 @@ int migrate_pages(struct list_head *from, new_page_t get_new_page,

    for(pass = 0; pass < 10 && retry; pass++) {
    retry = 0;
    + nr_failed = 0;

    list_for_each_entry_safe(page, page2, from, lru) {
    cond_resched();
    --
    1.7.9.5


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