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SubjectRe: [RFC PATCH 2/2] mm: mmu_notifier fix for tlb_end_vma
On Thu, Aug 23, 2018 at 06:47:09PM +1000, Nicholas Piggin wrote:
> The generic tlb_end_vma does not call invalidate_range mmu notifier,
> and it resets resets the mmu_gather range, which means the notifier
> won't be called on part of the range in case of an unmap that spans
> multiple vmas.
>
> ARM64 seems to be the only arch I could see that has notifiers and
> uses the generic tlb_end_vma. I have not actually tested it.
>
> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
> ---
> include/asm-generic/tlb.h | 17 +++++++++++++----
> mm/memory.c | 10 ----------
> 2 files changed, 13 insertions(+), 14 deletions(-)

I think we only use the notifiers in the KVM code, which appears to leave
the ->invalidate_range() callback empty, so that at least explains why we
haven't run into problems here.

But the change looks correct to me, so:

Acked-by: Will Deacon <will.deacon@arm.com>

Thanks,

Will

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