Commit 94f89922 authored by Nicholas Piggin's avatar Nicholas Piggin Committed by Arnd Bergmann
Browse files

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: default avatarNicholas Piggin <npiggin@gmail.com>
Acked-by: default avatarMike Rapoport <rppt@linux.ibm.com>
Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
Cc: linux-arch@vger.kernel.org
Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
parent 3650b228

arch/c6x/include/asm/mmu_context.h

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+6 −0
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#ifndef _ASM_C6X_MMU_CONTEXT_H

#define _ASM_C6X_MMU_CONTEXT_H



#include <asm-generic/nommu_context.h>



#endif /* _ASM_C6X_MMU_CONTEXT_H */

arch/microblaze/include/asm/mmu_context.h

+1 −1
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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

arch/sh/include/asm/mmu_context.h

+1 −1
Original line number Diff line number Diff line
@@ -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 */

include/asm-generic/mmu_context.h

+44 −14
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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



static inline void activate_mm(struct mm_struct *prev_mm,

			       struct mm_struct *next_mm)

/**

 * 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 */

include/asm-generic/nommu_context.h

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+19 −0
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/* 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 */