linux-kernel - Re: [PATCH v3 6/7] mm/gup: remove vmas parameter from pin_user

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Date:   Mon, 17 Apr 2023 07:59:34 -0400
From:   Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>
To:     Lorenzo Stoakes <lstoakes@...il.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Matthew Wilcox <willy@...radead.org>,
        David Hildenbrand <david@...hat.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Leon Romanovsky <leon@...nel.org>,
        Christian Benvenuti <benve@...co.com>,
        Nelson Escobar <neescoba@...co.com>,
        Bernard Metzler <bmt@...ich.ibm.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>, Jens Axboe <axboe@...nel.dk>,
        Pavel Begunkov <asml.silence@...il.com>,
        Bjorn Topel <bjorn@...nel.org>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-rdma@...r.kernel.org,
        linux-media@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
        netdev@...r.kernel.org, io-uring@...r.kernel.org,
        bpf@...r.kernel.org
Subject: Re: [PATCH v3 6/7] mm/gup: remove vmas parameter from
 pin_user_pages()


On 4/15/23 8:09 AM, Lorenzo Stoakes wrote:
> After the introduction of FOLL_SAME_FILE we no longer require vmas for any
> invocation of pin_user_pages(), so eliminate this parameter from the
> function and all callers.
> 
> This clears the way to removing the vmas parameter from GUP altogether.
> 
> Signed-off-by: Lorenzo Stoakes <lstoakes@...il.com>
> ---
>  arch/powerpc/mm/book3s64/iommu_api.c       | 2 +-
>  drivers/infiniband/hw/qib/qib_user_pages.c | 2 +-
>  drivers/infiniband/hw/usnic/usnic_uiom.c   | 2 +-
>  drivers/infiniband/sw/siw/siw_mem.c        | 2 +-
>  drivers/media/v4l2-core/videobuf-dma-sg.c  | 2 +-
>  drivers/vdpa/vdpa_user/vduse_dev.c         | 2 +-
>  drivers/vhost/vdpa.c                       | 2 +-
>  include/linux/mm.h                         | 3 +--
>  io_uring/rsrc.c                            | 2 +-
>  mm/gup.c                                   | 9 +++------
>  mm/gup_test.c                              | 9 ++++-----
>  net/xdp/xdp_umem.c                         | 2 +-
>  12 files changed, 17 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/infiniband/hw/qib/qib_user_pages.c b/drivers/infiniband/hw/qib/qib_user_pages.c
> index f693bc753b6b..1bb7507325bc 100644
> --- a/drivers/infiniband/hw/qib/qib_user_pages.c
> +++ b/drivers/infiniband/hw/qib/qib_user_pages.c
> @@ -111,7 +111,7 @@ int qib_get_user_pages(unsigned long start_page, size_t num_pages,
>  		ret = pin_user_pages(start_page + got * PAGE_SIZE,
>  				     num_pages - got,
>  				     FOLL_LONGTERM | FOLL_WRITE,
> -				     p + got, NULL);
> +				     p + got);
>  		if (ret < 0) {
>  			mmap_read_unlock(current->mm);
>  			goto bail_release;

For Qib...

Acked-by: Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>