[RESEND PATCH V3 2/5] mm/hugetlb: Enable PUD level huge page migration

From: Anshuman Khandual <anshuman.khandual@arm.com>
To: linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Cc: suzuki.poulose@arm.com, will.deacon@arm.com,
	Steven.Price@arm.com, steve.capper@arm.com,
	catalin.marinas@arm.com, mhocko@kernel.org,
	akpm@linux-foundation.org, mike.kravetz@oracle.com,
	n-horiguchi@ah.jp.nec.com
Subject: [RESEND PATCH V3 2/5] mm/hugetlb: Enable PUD level huge page migration
Date: Tue, 18 Dec 2018 13:54:07 +0530	[thread overview]
Message-ID: <1545121450-1663-3-git-send-email-anshuman.khandual@arm.com> (raw)
In-Reply-To: <1545121450-1663-1-git-send-email-anshuman.khandual@arm.com>

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.

Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Reviewed-by: Steve Capper <steve.capper@arm.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
 include/linux/hugetlb.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 1b858d7..70bcd89 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -497,7 +497,8 @@ static inline bool hugepage_migration_supported(struct hstate *h)
 {
 #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;
-- 
2.7.4

