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From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
To: j.glisse@gmail.com, akpm@linux-foundation.org
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        =?utf-8?B?SsOpcsO0bWU=?= Glisse <jglisse@redhat.com>
Subject: Re: [PATCH 03/36] mmu_notifier: pass page pointer to mmu_notifier_invalidate_page()
In-Reply-To: <1432236705-4209-4-git-send-email-j.glisse@gmail.com>
References: <1432236705-4209-1-git-send-email-j.glisse@gmail.com> <1432236705-4209-4-git-send-email-j.glisse@gmail.com>
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Date: Wed, 27 May 2015 10:47:44 +0530
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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