1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __ASM_GENERIC_MMU_CONTEXT_H 3 #define __ASM_GENERIC_MMU_CONTEXT_H 4 5 /* 6 * Generic hooks to implement no-op functionality. 7 */ 8 9 struct task_struct; 10 struct mm_struct; 11 12 /* 13 * enter_lazy_tlb - Called when "tsk" is about to enter lazy TLB mode. 14 * 15 * @mm: the currently active mm context which is becoming lazy 16 * @tsk: task which is entering lazy tlb 17 * 18 * tsk->mm will be NULL 19 */ 20 #ifndef enter_lazy_tlb 21 static inline void enter_lazy_tlb(struct mm_struct *mm, 22 struct task_struct *tsk) 23 { 24 } 25 #endif 26 27 /** 28 * init_new_context - Initialize context of a new mm_struct. 29 * @tsk: task struct for the mm 30 * @mm: the new mm struct 31 * @return: 0 on success, -errno on failure 32 */ 33 #ifndef init_new_context 34 static inline int init_new_context(struct task_struct *tsk, 35 struct mm_struct *mm) 36 { 37 return 0; 38 } 39 #endif 40 41 /** 42 * destroy_context - Undo init_new_context when the mm is going away 43 * @mm: old mm struct 44 */ 45 #ifndef destroy_context 46 static inline void destroy_context(struct mm_struct *mm) 47 { 48 } 49 #endif 50 51 /** 52 * activate_mm - called after exec switches the current task to a new mm, to switch to it 53 * @prev_mm: previous mm of this task 54 * @next_mm: new mm 55 */ 56 #ifndef activate_mm 57 static inline void activate_mm(struct mm_struct *prev_mm, 58 struct mm_struct *next_mm) 59 { 60 switch_mm(prev_mm, next_mm, current); 61 } 62 #endif 63 64 /** 65 * dectivate_mm - called when an mm is released after exit or exec switches away from it 66 * @tsk: the task 67 * @mm: the old mm 68 */ 69 #ifndef deactivate_mm 70 static inline void deactivate_mm(struct task_struct *tsk, 71 struct mm_struct *mm) 72 { 73 } 74 #endif 75 76 #endif /* __ASM_GENERIC_MMU_CONTEXT_H */ 77