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
enter_lazy_tlb(struct mm_struct * mm,struct task_struct * tsk)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
init_new_context(struct task_struct * tsk,struct mm_struct * mm)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
destroy_context(struct mm_struct * mm)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
activate_mm(struct mm_struct * prev_mm,struct mm_struct * next_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
deactivate_mm(struct task_struct * tsk,struct mm_struct * 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