include/asm-generic/mmu_context.h

   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 */