From d8289d3a5854a2a0ae144bff106a78738fe63050 Mon Sep 17 00:00:00 2001 From: Will Deacon Date: Thu, 23 Aug 2018 19:08:15 +0100 Subject: arm64: tlb: Justify non-leaf invalidation in flush_tlb_range() Add a comment to explain why we can't get away with last-level invalidation in flush_tlb_range() Acked-by: Peter Zijlstra (Intel) Signed-off-by: Will Deacon Signed-off-by: Catalin Marinas --- arch/arm64/include/asm/tlbflush.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'arch/arm64') diff --git a/arch/arm64/include/asm/tlbflush.h b/arch/arm64/include/asm/tlbflush.h index e257f8655b84..ddbf1718669d 100644 --- a/arch/arm64/include/asm/tlbflush.h +++ b/arch/arm64/include/asm/tlbflush.h @@ -182,6 +182,10 @@ static inline void __flush_tlb_range(struct vm_area_struct *vma, static inline void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) { + /* + * We cannot use leaf-only invalidation here, since we may be invalidating + * table entries as part of collapsing hugepages or moving page tables. + */ __flush_tlb_range(vma, start, end, false); } -- cgit v1.2.3-59-g8ed1b