1 files changed, 68 insertions, 0 deletions
diff --git a/include/linux/khugepaged.h b/include/linux/khugepaged.h
new file mode 100644
index 000000000..f68865e19
--- /dev/null
+++ b/include/linux/khugepaged.h
@@ -0,0 +1,68 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_KHUGEPAGED_H
+#define _LINUX_KHUGEPAGED_H
+
+#include <linux/sched/coredump.h> /* MMF_VM_HUGEPAGE */
+
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+extern struct attribute_group khugepaged_attr_group;
+
+extern int khugepaged_init(void);
+extern void khugepaged_destroy(void);
+extern int start_stop_khugepaged(void);
+extern void __khugepaged_enter(struct mm_struct *mm);
+extern void __khugepaged_exit(struct mm_struct *mm);
+extern void khugepaged_enter_vma(struct vm_area_struct *vma,
+				 unsigned long vm_flags);
+extern void khugepaged_min_free_kbytes_update(void);
+extern bool current_is_khugepaged(void);
+#ifdef CONFIG_SHMEM
+extern int collapse_pte_mapped_thp(struct mm_struct *mm, unsigned long addr,
+				   bool install_pmd);
+#else
+static inline int collapse_pte_mapped_thp(struct mm_struct *mm,
+					  unsigned long addr, bool install_pmd)
+{
+	return 0;
+}
+#endif
+
+static inline void khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
+{
+	if (test_bit(MMF_VM_HUGEPAGE, &oldmm->flags))
+		__khugepaged_enter(mm);
+}
+
+static inline void khugepaged_exit(struct mm_struct *mm)
+{
+	if (test_bit(MMF_VM_HUGEPAGE, &mm->flags))
+		__khugepaged_exit(mm);
+}
+#else /* CONFIG_TRANSPARENT_HUGEPAGE */
+static inline void khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
+{
+}
+static inline void khugepaged_exit(struct mm_struct *mm)
+{
+}
+static inline void khugepaged_enter_vma(struct vm_area_struct *vma,
+					unsigned long vm_flags)
+{
+}
+static inline int collapse_pte_mapped_thp(struct mm_struct *mm,
+					  unsigned long addr, bool install_pmd)
+{
+	return 0;
+}
+
+static inline void khugepaged_min_free_kbytes_update(void)
+{
+}
+
+static inline bool current_is_khugepaged(void)
+{
+	return false;
+}
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
+
+#endif /* _LINUX_KHUGEPAGED_H */