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    Subject[PATCH 2/4] hugetlb: update_and_free_page(): don't clear PG_reserved bit
    Date
    Hugepages pages never get the PG_reserved bit set, so don't clear it. But
    add a warning just in case.

    Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
    ---
    mm/hugetlb.c | 5 +++--
    1 file changed, 3 insertions(+), 2 deletions(-)

    diff --git a/mm/hugetlb.c b/mm/hugetlb.c
    index 8c50547..7e07e47 100644
    --- a/mm/hugetlb.c
    +++ b/mm/hugetlb.c
    @@ -581,8 +581,9 @@ static void update_and_free_page(struct hstate *h, struct page *page)
    for (i = 0; i < pages_per_huge_page(h); i++) {
    page[i].flags &= ~(1 << PG_locked | 1 << PG_error |
    1 << PG_referenced | 1 << PG_dirty |
    - 1 << PG_active | 1 << PG_reserved |
    - 1 << PG_private | 1 << PG_writeback);
    + 1 << PG_active | 1 << PG_private |
    + 1 << PG_writeback);
    + WARN_ON(PageReserved(&page[i]));
    }
    VM_BUG_ON_PAGE(hugetlb_cgroup_from_page(page), page);
    set_compound_page_dtor(page, NULL);
    --
    1.8.1.4


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