linux-kernel - Re: [PATCH v5 08/15] mm: Add unsafe_follow

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Date:   Mon, 2 Nov 2020 16:41:31 +0000
From:   Christoph Hellwig <hch@...radead.org>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     Daniel Vetter <daniel.vetter@...ll.ch>,
        Christoph Hellwig <hch@...radead.org>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>,
        KVM list <kvm@...r.kernel.org>, Linux MM <linux-mm@...ck.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
        "open list:DMA BUFFER SHARING FRAMEWORK" 
        <linux-media@...r.kernel.org>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Kees Cook <keescook@...omium.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        John Hubbard <jhubbard@...dia.com>,
        J??r??me Glisse <jglisse@...hat.com>, Jan Kara <jack@...e.cz>
Subject: Re: [PATCH v5 08/15] mm: Add unsafe_follow_pfn

On Mon, Nov 02, 2020 at 11:52:56AM -0400, Jason Gunthorpe wrote:
> Need to hold the lock to check that and there are two ways to register
> notifiers these days, so it feels to expensive to me.
> 
> CH's 'export symbol only for kvm' really does seem the most robust way
> to handle this though.

I hope I can get that done for this merge window, but I'm not sure.

I still think we should at least have a new name for the old follow_pfn
that no one should use.  And it should sound more scary than
unsafe_follow_pfn :)