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arm64: tlb: Justify non-leaf invalidation in flush_tlb_range()

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Add a comment to explain why we can't get away with last-level
invalidation in flush_tlb_range()

Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Will Deacon 2018-08-23 19:08:15 +01:00 committed by Catalin Marinas
parent 0795edaf3f
commit d8289d3a58
1 changed files with 4 additions and 0 deletions
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4
arch/arm64/include/asm/tlbflush.h
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@ -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);
}