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[61.68.212.105]) by smtp.gmail.com with ESMTPSA id r7sm3327140pfl.186.2020.08.26.07.52.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 26 Aug 2020 07:53:01 -0700 (PDT) From: Nicholas Piggin To: linux-arch@vger.kernel.org Cc: Nicholas Piggin , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Arnd Bergmann Subject: [PATCH v2 01/23] asm-generic: add generic MMU versions of mmu context functions Date: Thu, 27 Aug 2020 00:52:27 +1000 Message-Id: <20200826145249.745432-2-npiggin@gmail.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20200826145249.745432-1-npiggin@gmail.com> References: <20200826145249.745432-1-npiggin@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 Cc: Arnd Bergmann Cc: linux-arch@vger.kernel.org Signed-off-by: Nicholas Piggin --- arch/microblaze/include/asm/mmu_context.h | 2 +- arch/sh/include/asm/mmu_context.h | 2 +- include/asm-generic/mmu_context.h | 57 +++++++++++++++++------ include/asm-generic/nommu_context.h | 19 ++++++++ 4 files changed, 64 insertions(+), 16 deletions(-) create mode 100644 include/asm-generic/nommu_context.h diff --git a/arch/microblaze/include/asm/mmu_context.h b/arch/microblaze/include/asm/mmu_context.h index f74f9da07fdc..34004efb3def 100644 --- a/arch/microblaze/include/asm/mmu_context.h +++ b/arch/microblaze/include/asm/mmu_context.h @@ -2,5 +2,5 @@ #ifdef CONFIG_MMU # include #else -# include +# include #endif diff --git a/arch/sh/include/asm/mmu_context.h b/arch/sh/include/asm/mmu_context.h index f664e51e8a15..461b1304580b 100644 --- a/arch/sh/include/asm/mmu_context.h +++ b/arch/sh/include/asm/mmu_context.h @@ -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 +#include #endif /* CONFIG_MMU */ diff --git a/include/asm-generic/mmu_context.h b/include/asm-generic/mmu_context.h index 6be9106fb6fb..86cea80a50df 100644 --- a/include/asm-generic/mmu_context.h +++ b/include/asm-generic/mmu_context.h @@ -3,44 +3,73 @@ #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 - 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 + */ +#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 */ diff --git a/include/asm-generic/nommu_context.h b/include/asm-generic/nommu_context.h new file mode 100644 index 000000000000..4f916f9e16cd --- /dev/null +++ b/include/asm-generic/nommu_context.h @@ -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 + +static inline void switch_mm(struct mm_struct *prev, + struct mm_struct *next, + struct task_struct *tsk) +{ +} + +#include + +#endif /* __ASM_GENERIC_NOMMU_H */ -- 2.23.0