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

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Date:   Mon, 2 Nov 2020 13:16:39 -0400
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Daniel Vetter <daniel.vetter@...ll.ch>
Cc:     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 05:42:20PM +0100, Daniel Vetter 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.
> 
> Uh I mixed stuff up all along, struct mmu_notifier *subcription that
> all the mmu notifier users use has the ->mm pointer we want right
> there. That's good enough I think.

Yah, if you can pass in one of those instead of the raw mm it would be
fine

Jason