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Date: Thu, 30 Aug 2018 17:15:38 +0100 From: Will Deacon <will.deacon@....com> To: linux-kernel@...r.kernel.org Cc: peterz@...radead.org, benh@....ibm.com, torvalds@...ux-foundation.org, npiggin@...il.com, catalin.marinas@....com, linux-arm-kernel@...ts.infradead.org, Will Deacon <will.deacon@....com> Subject: [PATCH 04/12] 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() Signed-off-by: Will Deacon <will.deacon@....com> --- arch/arm64/include/asm/tlbflush.h | 4 ++++ 1 file changed, 4 insertions(+) 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); } -- 2.1.4
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