linux-kernel - Re: [PATCH RFC 19/19] habanalabs: remove FOLL

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Date:   Mon, 7 Nov 2022 23:25:35 +0200
From:   Oded Gabbay <ogabbay@...nel.org>
To:     David Hildenbrand <david@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        etnaviv@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-media@...r.kernel.org, linux-kselftest@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jason Gunthorpe <jgg@...pe.ca>,
        John Hubbard <jhubbard@...dia.com>,
        Peter Xu <peterx@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Hugh Dickins <hughd@...gle.com>, Nadav Amit <namit@...are.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Matthew Wilcox <willy@...radead.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Muchun Song <songmuchun@...edance.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        David Airlie <airlied@...il.com>, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH RFC 19/19] habanalabs: remove FOLL_FORCE usage

On Mon, Nov 7, 2022 at 6:19 PM David Hildenbrand <david@...hat.com> wrote:
>
> FOLL_FORCE is really only for debugger access. As we unpin the pinned pages
> using unpin_user_pages_dirty_lock(true), the assumption is that all these
> pages are writable.
>
> FOLL_FORCE in this case seems to be due to copy-and-past from other
> drivers. Let's just remove it.
>
> Cc: Oded Gabbay <ogabbay@...nel.org>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Signed-off-by: David Hildenbrand <david@...hat.com>
> ---
>  drivers/misc/habanalabs/common/memory.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/misc/habanalabs/common/memory.c b/drivers/misc/habanalabs/common/memory.c
> index ef28f3b37b93..e35cca96bbef 100644
> --- a/drivers/misc/habanalabs/common/memory.c
> +++ b/drivers/misc/habanalabs/common/memory.c
> @@ -2312,8 +2312,7 @@ static int get_user_memory(struct hl_device *hdev, u64 addr, u64 size,
>         if (!userptr->pages)
>                 return -ENOMEM;
>
> -       rc = pin_user_pages_fast(start, npages,
> -                                FOLL_FORCE | FOLL_WRITE | FOLL_LONGTERM,
> +       rc = pin_user_pages_fast(start, npages, FOLL_WRITE | FOLL_LONGTERM,
>                                  userptr->pages);
>
>         if (rc != npages) {
> --
> 2.38.1
>
>
Acked-by: Oded Gabbay <ogabbay@...nel.org>
Thanks,
Oded