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
9struct task_struct;
10struct 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
21static 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
34static 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
46static 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
57static 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
70static 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

source code of linux/include/asm-generic/mmu_context.h