linux-kernel - [RFC 8/9] powerpc/mm: Enable HugeTLB page migration

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Message-Id: <1457525450-4262-8-git-send-email-khandual@linux.vnet.ibm.com>
Date:	Wed,  9 Mar 2016 17:40:49 +0530
From:	Anshuman Khandual <khandual@...ux.vnet.ibm.com>
To:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org
Cc:	hughd@...gle.com, kirill@...temov.name, n-horiguchi@...jp.nec.com,
	akpm@...ux-foundation.org, mgorman@...hsingularity.net,
	aneesh.kumar@...ux.vnet.ibm.com, mpe@...erman.id.au
Subject: [RFC 8/9] powerpc/mm: Enable HugeTLB page migration

This change enables HugeTLB page migration for PPC64_BOOK3S systems
for HugeTLB pages implemented at the PMD level. It enables the kernel
configuration option ARCH_ENABLE_HUGEPAGE_MIGRATION which turns on
'hugepage_migration_supported' function which is checked for feature
presence during migration.

Signed-off-by: Anshuman Khandual <khandual@...ux.vnet.ibm.com>
---
 arch/powerpc/Kconfig | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index c6920bb..cefc368 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -86,6 +86,10 @@ config GENERIC_HWEIGHT
 config ARCH_HAS_DMA_SET_COHERENT_MASK
         bool
 
+config ARCH_ENABLE_HUGEPAGE_MIGRATION
+	def_bool y
+	depends on PPC_BOOK3S_64 && HUGETLB_PAGE && MIGRATION
+
 config PPC
 	bool
 	default y
-- 
2.1.0