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

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Message-ID: <20201102072931.GA16419@infradead.org>
Date:   Mon, 2 Nov 2020 07:29:31 +0000
From:   Christoph Hellwig <hch@...radead.org>
To:     Daniel Vetter <daniel.vetter@...ll.ch>
Cc:     DRI Development <dri-devel@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>, kvm@...r.kernel.org,
        linux-mm@...ck.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-media@...r.kernel.org,
        Daniel Vetter <daniel.vetter@...el.com>,
        Christoph Hellwig <hch@...radead.org>,
        Jason Gunthorpe <jgg@...pe.ca>,
        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 Fri, Oct 30, 2020 at 11:08:08AM +0100, Daniel Vetter wrote:
> Also mark up follow_pfn as EXPORT_SYMBOL_GPL. The only safe way to use
> that by drivers/modules is together with an mmu_notifier, and that's
> all _GPL stuff.

I also think it also needs to be renamed to explicitly break any existing
users out of tree or int the submission queue.