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    Subject[RFC PATCH 17/24] mm/hugetlb: Add a BUILD_BUG_ON to check if struct page size is a power of two
    Date
    We only can free the unused vmemmap to the buddy system when the
    size of struct page is a power of two. So add a BUILD_BUG_ON to
    check the illegal case.

    Signed-off-by: Muchun Song <songmuchun@bytedance.com>
    ---
    mm/hugetlb.c | 4 ++++
    1 file changed, 4 insertions(+)

    diff --git a/mm/hugetlb.c b/mm/hugetlb.c
    index 7072b849af3d..34706cec21ec 100644
    --- a/mm/hugetlb.c
    +++ b/mm/hugetlb.c
    @@ -3817,6 +3817,10 @@ static int __init hugetlb_init(void)
    {
    int i;

    +#ifdef CONFIG_HUGETLB_PAGE_FREE_VMEMMAP
    + BUILD_BUG_ON_NOT_POWER_OF_2(sizeof(struct page));
    +#endif
    +
    if (!hugepages_supported()) {
    if (hugetlb_max_hstate || default_hstate_max_huge_pages)
    pr_warn("HugeTLB: huge pages not supported, ignoring associated command-line parameters\n");
    --
    2.20.1
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