From: Huang Ying <ying.hu...@intel.com>

Previously, the PMD swap operations are only enabled for
CONFIG_ARCH_ENABLE_THP_MIGRATION.  Because they are only used by the
THP migration support.  We will support PMD swap mapping to the huge
swap cluster and swapin the THP as a whole.  That will be enabled via
CONFIG_THP_SWAP and needs these PMD swap operations.  So enable the
PMD swap operations for CONFIG_THP_SWAP too.

Signed-off-by: "Huang, Ying" <ying.hu...@intel.com>
Cc: "Kirill A. Shutemov" <kirill.shute...@linux.intel.com>
Cc: Andrea Arcangeli <aarca...@redhat.com>
Cc: Michal Hocko <mho...@suse.com>
Cc: Johannes Weiner <han...@cmpxchg.org>
Cc: Shaohua Li <s...@kernel.org>
Cc: Hugh Dickins <hu...@google.com>
Cc: Minchan Kim <minc...@kernel.org>
Cc: Rik van Riel <r...@redhat.com>
Cc: Dave Hansen <dave.han...@linux.intel.com>
Cc: Naoya Horiguchi <n-horigu...@ah.jp.nec.com>
Cc: Zi Yan <zi....@cs.rutgers.edu>
---
 arch/x86/include/asm/pgtable.h |  2 +-
 include/asm-generic/pgtable.h  |  2 +-
 include/linux/swapops.h        | 44 ++++++++++++++++++----------------
 3 files changed, 25 insertions(+), 23 deletions(-)

diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 5f49b4ff0c24..4b4398253528 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -1219,7 +1219,7 @@ static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
        return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY);
 }
 
-#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
+#if defined(CONFIG_ARCH_ENABLE_THP_MIGRATION) || defined(CONFIG_THP_SWAP)
 static inline pmd_t pmd_swp_mksoft_dirty(pmd_t pmd)
 {
        return pmd_set_flags(pmd, _PAGE_SWP_SOFT_DIRTY);
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index f59639afaa39..bb8354981a36 100644
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -675,7 +675,7 @@ static inline void ptep_modify_prot_commit(struct mm_struct 
*mm,
 #endif
 
 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
-#ifndef CONFIG_ARCH_ENABLE_THP_MIGRATION
+#if !defined(CONFIG_ARCH_ENABLE_THP_MIGRATION) && !defined(CONFIG_THP_SWAP)
 static inline pmd_t pmd_swp_mksoft_dirty(pmd_t pmd)
 {
        return pmd;
diff --git a/include/linux/swapops.h b/include/linux/swapops.h
index 1d3877c39a00..f1be5a52f5c8 100644
--- a/include/linux/swapops.h
+++ b/include/linux/swapops.h
@@ -258,17 +258,7 @@ static inline int is_write_migration_entry(swp_entry_t 
entry)
 
 #endif
 
-struct page_vma_mapped_walk;
-
-#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
-extern void set_pmd_migration_entry(struct page_vma_mapped_walk *pvmw,
-               struct page *page);
-
-extern void remove_migration_pmd(struct page_vma_mapped_walk *pvmw,
-               struct page *new);
-
-extern void pmd_migration_entry_wait(struct mm_struct *mm, pmd_t *pmd);
-
+#if defined(CONFIG_ARCH_ENABLE_THP_MIGRATION) || defined(CONFIG_THP_SWAP)
 static inline swp_entry_t pmd_to_swp_entry(pmd_t pmd)
 {
        swp_entry_t arch_entry;
@@ -286,6 +276,28 @@ static inline pmd_t swp_entry_to_pmd(swp_entry_t entry)
        arch_entry = __swp_entry(swp_type(entry), swp_offset(entry));
        return __swp_entry_to_pmd(arch_entry);
 }
+#else
+static inline swp_entry_t pmd_to_swp_entry(pmd_t pmd)
+{
+       return swp_entry(0, 0);
+}
+
+static inline pmd_t swp_entry_to_pmd(swp_entry_t entry)
+{
+       return __pmd(0);
+}
+#endif
+
+struct page_vma_mapped_walk;
+
+#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
+extern void set_pmd_migration_entry(struct page_vma_mapped_walk *pvmw,
+               struct page *page);
+
+extern void remove_migration_pmd(struct page_vma_mapped_walk *pvmw,
+               struct page *new);
+
+extern void pmd_migration_entry_wait(struct mm_struct *mm, pmd_t *pmd);
 
 static inline int is_pmd_migration_entry(pmd_t pmd)
 {
@@ -306,16 +318,6 @@ static inline void remove_migration_pmd(struct 
page_vma_mapped_walk *pvmw,
 
 static inline void pmd_migration_entry_wait(struct mm_struct *m, pmd_t *p) { }
 
-static inline swp_entry_t pmd_to_swp_entry(pmd_t pmd)
-{
-       return swp_entry(0, 0);
-}
-
-static inline pmd_t swp_entry_to_pmd(swp_entry_t entry)
-{
-       return __pmd(0);
-}
-
 static inline int is_pmd_migration_entry(pmd_t pmd)
 {
        return 0;
-- 
2.17.0

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