linux-kernel - [PATCH v2 16/23] powerpc: use asm-generic/mmu

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Message-Id: <20200826145249.745432-17-npiggin@gmail.com>
Date:   Thu, 27 Aug 2020 00:52:42 +1000
From:   Nicholas Piggin <npiggin@...il.com>
To:     linux-arch@...r.kernel.org
Cc:     Nicholas Piggin <npiggin@...il.com>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Arnd Bergmann <arnd@...db.de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...abs.org>,
        linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v2 16/23] powerpc: use asm-generic/mmu_context.h for no-op implementations

Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Paul Mackerras <paulus@...abs.org>
Cc: linuxppc-dev@...ts.ozlabs.org
Signed-off-by: Nicholas Piggin <npiggin@...il.com>
---
 arch/powerpc/include/asm/mmu_context.h | 22 +++++++---------------
 1 file changed, 7 insertions(+), 15 deletions(-)

diff --git a/arch/powerpc/include/asm/mmu_context.h b/arch/powerpc/include/asm/mmu_context.h
index 7f3658a97384..bc22e247ab55 100644
--- a/arch/powerpc/include/asm/mmu_context.h
+++ b/arch/powerpc/include/asm/mmu_context.h
@@ -14,7 +14,9 @@
 /*
  * Most if the context management is out of line
  */
+#define init_new_context init_new_context
 extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
+#define destroy_context destroy_context
 extern void destroy_context(struct mm_struct *mm);
 #ifdef CONFIG_SPAPR_TCE_IOMMU
 struct mm_iommu_table_group_mem_t;
@@ -235,27 +237,15 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
 }
 #define switch_mm_irqs_off switch_mm_irqs_off
 
-
-#define deactivate_mm(tsk,mm)	do { } while (0)
-
-/*
- * After we have set current->mm to a new value, this activates
- * the context for the new mm so we see the new mappings.
- */
-static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
-{
-	switch_mm(prev, next, current);
-}
-
-/* We don't currently use enter_lazy_tlb() for anything */
+#ifdef CONFIG_PPC_BOOK3E_64
+#define enter_lazy_tlb enter_lazy_tlb
 static inline void enter_lazy_tlb(struct mm_struct *mm,
 				  struct task_struct *tsk)
 {
 	/* 64-bit Book3E keeps track of current PGD in the PACA */
-#ifdef CONFIG_PPC_BOOK3E_64
 	get_paca()->pgd = NULL;
-#endif
 }
+#endif
 
 extern void arch_exit_mmap(struct mm_struct *mm);
 
@@ -298,5 +288,7 @@ static inline int arch_dup_mmap(struct mm_struct *oldmm,
 	return 0;
 }
 
+#include <asm-generic/mmu_context.h>
+
 #endif /* __KERNEL__ */
 #endif /* __ASM_POWERPC_MMU_CONTEXT_H */
-- 
2.23.0