linux-kernel - Re: [PATCH v5 1/6] mm/gup: remove unused vmas parameter from get_user

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Message-ID: <dfb84ac7-cb5f-5631-3f71-7f882300e240@nvidia.com>
Date:   Tue, 16 May 2023 10:03:59 -0700
From:   John Hubbard <jhubbard@...dia.com>
To:     David Hildenbrand <david@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>
Cc:     Lorenzo Stoakes <lstoakes@...il.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>, x86@...nel.org,
        linux-sgx@...r.kernel.org, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, kvm@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        "H . Peter Anvin" <hpa@...or.com>, Xinhui Pan <Xinhui.Pan@....com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Dimitri Sivanich <dimitri.sivanich@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Jens Axboe <axboe@...nel.dk>,
        Pavel Begunkov <asml.silence@...il.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Christian Konig <christian.koenig@....com>,
        Jason Gunthorpe <jgg@...dia.com>
Subject: Re: [PATCH v5 1/6] mm/gup: remove unused vmas parameter from
 get_user_pages()

On 5/16/23 07:35, David Hildenbrand wrote:
...
>>> When passing NULL as "pages" to get_user_pages(), __get_user_pages_locked()
>>> won't set FOLL_GET. As FOLL_PIN is also not set, we won't be messing with
>>> the mapcount of the page.
> 
> For completeness: s/mapcount/refcount/ :)

whew, you had me going there! Now it all adds up. :) 

thanks,
-- 
John Hubbard
NVIDIA