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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/riscv/include/asm/tlbflush.h
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@@ -1,26 +1,16 @@
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+/* SPDX-License-Identifier: GPL-2.0-only */
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 /*
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  * Copyright (C) 2009 Chen Liqin <liqin.chen@sunplusct.com>
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  * Copyright (C) 2012 Regents of the University of California
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- *
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- *   This program is free software; you can redistribute it and/or
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- *   modify it under the terms of the GNU General Public License
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- *   as published by the Free Software Foundation, version 2.
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- *
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- *   This program is distributed in the hope that it will be useful,
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- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
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- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- *   GNU General Public License for more details.
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  */
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 #ifndef _ASM_RISCV_TLBFLUSH_H
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 #define _ASM_RISCV_TLBFLUSH_H
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 #include <linux/mm_types.h>
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+#include <asm/smp.h>
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-/*
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- * Flush entire local TLB.  'sfence.vma' implicitly fences with the instruction
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- * cache as well, so a 'fence.i' is not necessary.
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- */
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+#ifdef CONFIG_MMU
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 static inline void local_flush_tlb_all(void)
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 {
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 	__asm__ __volatile__ ("sfence.vma" : : : "memory");
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 {
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 	__asm__ __volatile__ ("sfence.vma %0" : : "r" (addr) : "memory");
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 }
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+#else /* CONFIG_MMU */
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+#define local_flush_tlb_all()			do { } while (0)
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+#define local_flush_tlb_page(addr)		do { } while (0)
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+#endif /* CONFIG_MMU */
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-#ifndef CONFIG_SMP
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+#if defined(CONFIG_SMP) && defined(CONFIG_MMU)
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+void flush_tlb_all(void);
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+void flush_tlb_mm(struct mm_struct *mm);
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+void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr);
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+void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
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+		     unsigned long end);
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+#else /* CONFIG_SMP && CONFIG_MMU */
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 #define flush_tlb_all() local_flush_tlb_all()
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 #define flush_tlb_page(vma, addr) local_flush_tlb_page(addr)
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@@ -44,20 +44,7 @@
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 }
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 #define flush_tlb_mm(mm) flush_tlb_all()
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-
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-#else /* CONFIG_SMP */
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-
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-#include <asm/sbi.h>
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-
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-#define flush_tlb_all() sbi_remote_sfence_vma(NULL, 0, -1)
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-#define flush_tlb_page(vma, addr) flush_tlb_range(vma, addr, 0)
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-#define flush_tlb_range(vma, start, end) \
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-	sbi_remote_sfence_vma(mm_cpumask((vma)->vm_mm)->bits, \
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-			      start, (end) - (start))
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-#define flush_tlb_mm(mm) \
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-	sbi_remote_sfence_vma(mm_cpumask(mm)->bits, 0, -1)
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-
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-#endif /* CONFIG_SMP */
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+#endif /* !CONFIG_SMP || !CONFIG_MMU */
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 /* Flush a range of kernel pages */
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 static inline void flush_tlb_kernel_range(unsigned long start,