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[PATCH v8 04/10] mm: thp: introduce CONFIG_ARCH_ENABLE_THP_MIGRATION

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From: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>

Introduces CONFIG_ARCH_ENABLE_THP_MIGRATION to limit thp migration
functionality to x86_64, which should be safer at the first step.

ChangeLog v1 -> v2:
- fixed config name in subject and patch description

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Reviewed-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
---
 arch/x86/Kconfig        |  4 ++++
 include/linux/huge_mm.h | 10 ++++++++++
 mm/Kconfig              |  3 +++
 3 files changed, 17 insertions(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index b6373817e6f4..631af221ce63 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2276,6 +2276,10 @@ config ARCH_ENABLE_HUGEPAGE_MIGRATION
 	def_bool y
 	depends on X86_64 && HUGETLB_PAGE && MIGRATION
 
+config ARCH_ENABLE_THP_MIGRATION
+	def_bool y
+	depends on X86_64 && TRANSPARENT_HUGEPAGE
+
 menu "Power management and ACPI options"
 
 config ARCH_HIBERNATION_HEADER
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index ee696347f928..d8f35a0865dc 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -233,6 +233,11 @@ void mm_put_huge_zero_page(struct mm_struct *mm);
 
 #define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
 
+static inline bool thp_migration_supported(void)
+{
+	return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION);
+}
+
 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
 #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
 #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
@@ -336,6 +341,11 @@ static inline struct page *follow_devmap_pud(struct vm_area_struct *vma,
 {
 	return NULL;
 }
+
+static inline bool thp_migration_supported(void)
+{
+	return false;
+}
 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 
 #endif /* _LINUX_HUGE_MM_H */
diff --git a/mm/Kconfig b/mm/Kconfig
index 9bf2055ed061..6634e0ed5c1b 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -262,6 +262,9 @@ config MIGRATION
 config ARCH_ENABLE_HUGEPAGE_MIGRATION
 	bool
 
+config ARCH_ENABLE_THP_MIGRATION
+	bool
+
 config PHYS_ADDR_T_64BIT
 	def_bool 64BIT || ARCH_PHYS_ADDR_T_64BIT
 
-- 
2.11.0

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[PATCH v8 00/10] mm: page migration enhancement for thp Zi Yan <zi.yan@sent.com> - 2017-07-01 15:50 +0200
  [PATCH v8 06/10] mm: thp: check pmd migration entry in common path Zi Yan <zi.yan@sent.com> - 2017-07-01 15:50 +0200
  [PATCH v8 09/10] mm: migrate: move_pages() supports thp migration Zi Yan <zi.yan@sent.com> - 2017-07-01 15:50 +0200
  [PATCH v8 01/10] mm: mempolicy: add queue_pages_required() Zi Yan <zi.yan@sent.com> - 2017-07-01 15:50 +0200
  [PATCH v8 08/10] mm: mempolicy: mbind and migrate_pages support thp migration Zi Yan <zi.yan@sent.com> - 2017-07-01 15:50 +0200
  [PATCH v8 04/10] mm: thp: introduce CONFIG_ARCH_ENABLE_THP_MIGRATION Zi Yan <zi.yan@sent.com> - 2017-07-01 15:50 +0200
  [PATCH v8 05/10] mm: thp: enable thp migration in generic path Zi Yan <zi.yan@sent.com> - 2017-07-01 15:50 +0200
    Re: [PATCH v8 05/10] mm: thp: enable thp migration in generic path "Kirill A. Shutemov" <kirill@shutemov.name> - 2017-07-02 20:00 +0200
      Re: [PATCH v8 05/10] mm: thp: enable thp migration in generic path "Zi Yan" <zi.yan@sent.com> - 2017-07-03 03:30 +0200

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