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 | |