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asm-generic: add generic MMU versions of mmu context functions

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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>
This commit is contained in:
Nicholas Piggin 2020-09-02 00:15:17 +10:00 committed by Arnd Bergmann
parent 3650b228f8
commit 94f89922e1
5 changed files with 72 additions and 17 deletions
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6
arch/c6x/include/asm/mmu_context.h Normal file
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@ -0,0 +1,6 @@
#ifndef _ASM_C6X_MMU_CONTEXT_H
#define _ASM_C6X_MMU_CONTEXT_H
#include <asm-generic/nommu_context.h>
#endif /* _ASM_C6X_MMU_CONTEXT_H */

2
arch/microblaze/include/asm/mmu_context.h
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@ -2,5 +2,5 @@
#ifdef CONFIG_MMU
# include <asm/mmu_context_mm.h>
#else
# include <asm-generic/mmu_context.h>
# include <asm-generic/nommu_context.h>
#endif

2
arch/sh/include/asm/mmu_context.h
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@ -133,7 +133,7 @@ static inline void switch_mm(struct mm_struct *prev,
#define set_TTB(pgd) do { } while (0)
#define get_TTB() (0)
#include <asm-generic/mmu_context.h>
#include <asm-generic/nommu_context.h>
#endif /* CONFIG_MMU */

60
include/asm-generic/mmu_context.h
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@ -3,44 +3,74 @@
#define __ASM_GENERIC_MMU_CONTEXT_H
/*
* Generic hooks for NOMMU architectures, which do not need to do
* anything special here.
* Generic hooks to implement no-op functionality.
*/
#include <asm-generic/mm_hooks.h>
struct task_struct;
struct mm_struct;
/*
* enter_lazy_tlb - Called when "tsk" is about to enter lazy TLB mode.
*
* @mm: the currently active mm context which is becoming lazy
* @tsk: task which is entering lazy tlb
*
* tsk->mm will be NULL
*/
#ifndef enter_lazy_tlb
static inline void enter_lazy_tlb(struct mm_struct *mm,
struct task_struct *tsk)
{
}
#endif
/**
* init_new_context - Initialize context of a new mm_struct.
* @tsk: task struct for the mm
* @mm: the new mm struct
* @return: 0 on success, -errno on failure
*/
#ifndef init_new_context
static inline int init_new_context(struct task_struct *tsk,
struct mm_struct *mm)
{
return 0;
}
#endif
/**
* destroy_context - Undo init_new_context when the mm is going away
* @mm: old mm struct
*/
#ifndef destroy_context
static inline void destroy_context(struct mm_struct *mm)
{
}
#endif
static inline void deactivate_mm(struct task_struct *task,
struct mm_struct *mm)
{
}
static inline void switch_mm(struct mm_struct *prev,
struct mm_struct *next,
struct task_struct *tsk)
{
}
/**
* activate_mm - called after exec switches the current task to a new mm, to switch to it
* @prev_mm: previous mm of this task
* @next_mm: new mm
*/
#ifndef activate_mm
static inline void activate_mm(struct mm_struct *prev_mm,
struct mm_struct *next_mm)
{
switch_mm(prev_mm, next_mm, current);
}
#endif
/**
* dectivate_mm - called when an mm is released after exit or exec switches away from it
* @tsk: the task
* @mm: the old mm
*/
#ifndef deactivate_mm
static inline void deactivate_mm(struct task_struct *tsk,
struct mm_struct *mm)
{
}
#endif
#endif /* __ASM_GENERIC_MMU_CONTEXT_H */

19
include/asm-generic/nommu_context.h Normal file
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@ -0,0 +1,19 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_GENERIC_NOMMU_H
#define __ASM_GENERIC_NOMMU_H
/*
* Generic hooks for NOMMU architectures, which do not need to do
* anything special here.
*/
#include <asm-generic/mm_hooks.h>
static inline void switch_mm(struct mm_struct *prev,
struct mm_struct *next,
struct task_struct *tsk)
{
}
#include <asm-generic/mmu_context.h>
#endif /* __ASM_GENERIC_NOMMU_H */