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asm-generic: add generic MMU versions of mmu context functions
Many of these are no-ops on many architectures, so extend mmu_context.h
to cover MMU and NOMMU, and split the NOMMU bits out to nommu_context.h
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Acked-by: Mike Rapoport <rppt@linux.ibm.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Cc: linux-arch@vger.kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
authored by
Nicholas Piggin
and committed by
Arnd Bergmann
94f89922
3650b228
+72
-17
+6
arch/c6x/include/asm/mmu_context.h
+6
arch/c6x/include/asm/mmu_context.h
+1
-1
arch/microblaze/include/asm/mmu_context.h
+1
-1
arch/microblaze/include/asm/mmu_context.h
+1
-1
arch/sh/include/asm/mmu_context.h
+1
-1
arch/sh/include/asm/mmu_context.h
+45
-15
include/asm-generic/mmu_context.h
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-15
include/asm-generic/mmu_context.h
···
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#define __ASM_GENERIC_MMU_CONTEXT_H
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/*
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* Generic hooks for NOMMU architectures, which do not need to do
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* anything special here.
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* Generic hooks to implement no-op functionality.
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*/
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-
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#include <asm-generic/mm_hooks.h>
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struct task_struct;
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struct mm_struct;
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/*
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* enter_lazy_tlb - Called when "tsk" is about to enter lazy TLB mode.
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*
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* @mm: the currently active mm context which is becoming lazy
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* @tsk: task which is entering lazy tlb
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*
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* tsk->mm will be NULL
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*/
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#ifndef enter_lazy_tlb
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static inline void enter_lazy_tlb(struct mm_struct *mm,
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struct task_struct *tsk)
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{
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}
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#endif
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/**
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* init_new_context - Initialize context of a new mm_struct.
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* @tsk: task struct for the mm
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* @mm: the new mm struct
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* @return: 0 on success, -errno on failure
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*/
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#ifndef init_new_context
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static inline int init_new_context(struct task_struct *tsk,
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struct mm_struct *mm)
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{
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return 0;
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}
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#endif
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/**
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* destroy_context - Undo init_new_context when the mm is going away
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* @mm: old mm struct
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*/
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#ifndef destroy_context
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static inline void destroy_context(struct mm_struct *mm)
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{
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}
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#endif
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static inline void deactivate_mm(struct task_struct *task,
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struct mm_struct *mm)
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{
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}
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static inline void switch_mm(struct mm_struct *prev,
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struct mm_struct *next,
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struct task_struct *tsk)
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{
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}
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/**
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* activate_mm - called after exec switches the current task to a new mm, to switch to it
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* @prev_mm: previous mm of this task
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* @next_mm: new mm
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*/
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#ifndef activate_mm
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static inline void activate_mm(struct mm_struct *prev_mm,
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struct mm_struct *next_mm)
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{
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switch_mm(prev_mm, next_mm, current);
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}
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#endif
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/**
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* dectivate_mm - called when an mm is released after exit or exec switches away from it
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* @tsk: the task
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* @mm: the old mm
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*/
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#ifndef deactivate_mm
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static inline void deactivate_mm(struct task_struct *tsk,
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struct mm_struct *mm)
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{
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}
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#endif
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#endif /* __ASM_GENERIC_MMU_CONTEXT_H */
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include/asm-generic/nommu_context.h
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include/asm-generic/nommu_context.h
···
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_GENERIC_NOMMU_H
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#define __ASM_GENERIC_NOMMU_H
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/*
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* Generic hooks for NOMMU architectures, which do not need to do
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* anything special here.
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*/
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#include <asm-generic/mm_hooks.h>
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static inline void switch_mm(struct mm_struct *prev,
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struct mm_struct *next,
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struct task_struct *tsk)
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{
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}
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#include <asm-generic/mmu_context.h>
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#endif /* __ASM_GENERIC_NOMMU_H */