From: Anshuman Khandual <anshuman.khandual@xxxxxxx> Subject: mm/hugetlb: enable PUD level huge page migration Architectures like arm64 have PUD level HugeTLB pages for certain configs (1GB huge page is PUD based on ARM64_4K_PAGES base page size) that can be enabled for migration. It can be achieved through checking for PUD_SHIFT order based HugeTLB pages during migration. Link: http://lkml.kernel.org/r/1545121450-1663-3-git-send-email-anshuman.khandual@xxxxxxx Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx> Reviewed-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx> Reviewed-by: Steve Capper <steve.capper@xxxxxxx> Acked-by: Michal Hocko <mhocko@xxxxxxxx> Cc: Catalin Marinas <catalin.marinas@xxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- include/linux/hugetlb.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/include/linux/hugetlb.h~mm-hugetlb-enable-pud-level-huge-page-migration +++ a/include/linux/hugetlb.h @@ -497,7 +497,8 @@ static inline bool hugepage_migration_su { #ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION if ((huge_page_shift(h) == PMD_SHIFT) || - (huge_page_shift(h) == PGDIR_SHIFT)) + (huge_page_shift(h) == PUD_SHIFT) || + (huge_page_shift(h) == PGDIR_SHIFT)) return true; else return false; _
