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