From e7fd28a706bfaf9cd65dccf18140187f7ad04839 Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <peterz@infradead.org>
Date: Mon, 27 Aug 2018 13:00:17 +0200
Subject: asm-generic/tlb, arch: Provide generic VIPT cache flush

The one obvious thing SH and ARM want is a sensible default for
tlb_start_vma(). (also: https://lkml.org/lkml/2004/1/15/6 )

Avoid all VIPT architectures providing their own tlb_start_vma()
implementation and rely on architectures to provide a no-op
flush_cache_range() when it is not relevant.

This patch makes tlb_start_vma() default to flush_cache_range(), which
should be right and sufficient. The only exceptions that I found where
(oddly):

  - m68k-mmu
  - sparc64
  - unicore

Those architectures appear to have flush_cache_range(), but their
current tlb_start_vma() does not call it.

No change in behavior intended.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Will Deacon <will.deacon@arm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Miller <davem@davemloft.net>
Cc: Guan Xuetao <gxt@pku.edu.cn>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Nick Piggin <npiggin@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 include/asm-generic/tlb.h | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

(limited to 'include')

diff --git a/include/asm-generic/tlb.h b/include/asm-generic/tlb.h
index e75620e41ba4..f0aa53db5e60 100644
--- a/include/asm-generic/tlb.h
+++ b/include/asm-generic/tlb.h
@@ -19,6 +19,7 @@
 #include <linux/swap.h>
 #include <asm/pgalloc.h>
 #include <asm/tlbflush.h>
+#include <asm/cacheflush.h>
 
 #ifdef CONFIG_MMU
 
@@ -356,17 +357,19 @@ static inline unsigned long tlb_get_unmap_size(struct mmu_gather *tlb)
  * the vmas are adjusted to only cover the region to be torn down.
  */
 #ifndef tlb_start_vma
-#define tlb_start_vma(tlb, vma) do { } while (0)
+#define tlb_start_vma(tlb, vma)						\
+do {									\
+	if (!tlb->fullmm)						\
+		flush_cache_range(vma, vma->vm_start, vma->vm_end);	\
+} while (0)
 #endif
 
-#define __tlb_end_vma(tlb, vma)					\
-	do {							\
-		if (!tlb->fullmm)				\
-			tlb_flush_mmu_tlbonly(tlb);		\
-	} while (0)
-
 #ifndef tlb_end_vma
-#define tlb_end_vma	__tlb_end_vma
+#define tlb_end_vma(tlb, vma)						\
+do {									\
+	if (!tlb->fullmm)						\
+		tlb_flush_mmu_tlbonly(tlb);				\
+} while (0)
 #endif
 
 #ifndef __tlb_remove_tlb_entry
-- 
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