Re: [PATCH 03/36] mmu_notifier: pass page pointer to mmu_notifier_invalidate_page()

["Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>]

j.glisse@gmail.com writes:

> From: Jérôme Glisse <jglisse@redhat.com>
>
> Listener of mm event might not have easy way to get the struct page
> behind and address invalidated with mmu_notifier_invalidate_page()
> function as this happens after the cpu page table have been clear/
> updated. This happens for instance if the listener is storing a dma
> mapping inside its secondary page table. To avoid complex reverse
> dma mapping lookup just pass along a pointer to the page being
> invalidated.

.....

> diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h
> index ada3ed1..283ad26 100644
> --- a/include/linux/mmu_notifier.h
> +++ b/include/linux/mmu_notifier.h
> @@ -172,6 +172,7 @@ struct mmu_notifier_ops {
>  	void (*invalidate_page)(struct mmu_notifier *mn,
>  				struct mm_struct *mm,
>  				unsigned long address,
> +				struct page *page,
>  				enum mmu_event event);
>  

How do we handle this w.r.t invalidate_range ? 

-aneesh

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