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Date: Tue, 20 Jun 2017 19:07:09 -0400 From: Zi Yan <zi.yan@...t.com> To: kirill.shutemov@...ux.intel.com, linux-kernel@...r.kernel.org, linux-mm@...ck.org Cc: akpm@...ux-foundation.org, minchan@...nel.org, vbabka@...e.cz, mgorman@...hsingularity.net, mhocko@...nel.org, khandual@...ux.vnet.ibm.com, zi.yan@...rutgers.edu, dnellans@...dia.com, dave.hansen@...el.com, n-horiguchi@...jp.nec.com Subject: [PATCH v7 04/10] mm: thp: introduce CONFIG_ARCH_ENABLE_THP_MIGRATION From: Naoya Horiguchi <n-horiguchi@...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@...jp.nec.com> Reviewed-by: Anshuman Khandual <khandual@...ux.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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