1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_KHUGEPAGED_H 3 #define _LINUX_KHUGEPAGED_H 4 5 #include <linux/sched/coredump.h> /* MMF_VM_HUGEPAGE */ 6 7 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 8 extern struct attribute_group khugepaged_attr_group; 9 10 extern int khugepaged_init(void); 11 extern void khugepaged_destroy(void); 12 extern int start_stop_khugepaged(void); 13 extern void __khugepaged_enter(struct mm_struct *mm); 14 extern void __khugepaged_exit(struct mm_struct *mm); 15 extern void khugepaged_enter_vma(struct vm_area_struct *vma, 16 unsigned long vm_flags); 17 extern void khugepaged_min_free_kbytes_update(void); 18 extern bool current_is_khugepaged(void); 19 #ifdef CONFIG_SHMEM 20 extern int collapse_pte_mapped_thp(struct mm_struct *mm, unsigned long addr, 21 bool install_pmd); 22 #else 23 static inline int collapse_pte_mapped_thp(struct mm_struct *mm, 24 unsigned long addr, bool install_pmd) 25 { 26 return 0; 27 } 28 #endif 29 30 static inline void khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm) 31 { 32 if (test_bit(MMF_VM_HUGEPAGE, &oldmm->flags)) 33 __khugepaged_enter(mm); 34 } 35 36 static inline void khugepaged_exit(struct mm_struct *mm) 37 { 38 if (test_bit(MMF_VM_HUGEPAGE, &mm->flags)) 39 __khugepaged_exit(mm); 40 } 41 #else /* CONFIG_TRANSPARENT_HUGEPAGE */ 42 static inline void khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm) 43 { 44 } 45 static inline void khugepaged_exit(struct mm_struct *mm) 46 { 47 } 48 static inline void khugepaged_enter_vma(struct vm_area_struct *vma, 49 unsigned long vm_flags) 50 { 51 } 52 static inline int collapse_pte_mapped_thp(struct mm_struct *mm, 53 unsigned long addr, bool install_pmd) 54 { 55 return 0; 56 } 57 58 static inline void khugepaged_min_free_kbytes_update(void) 59 { 60 } 61 62 static inline bool current_is_khugepaged(void) 63 { 64 return false; 65 } 66 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 67 68 #endif /* _LINUX_KHUGEPAGED_H */ 69