LXR linux/include/asm-generic/mmu

   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