[PATCH 1/2] powerpc/mm: Enable HugeTLB page migration

[Anshuman Khandual]

This enables HugeTLB page migration for PPC64_BOOK3S systems which implement
HugeTLB page at the PMD level. It enables the kernel configuration option
CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION by default which turns on the function
hugepage_migration_supported() during migration. After the recent changes
to the PTE format, HugeTLB page migration happens successfully.

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

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index e4824fd..65d52a0 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -82,6 +82,10 @@ 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