Re: [PATCH 1/2] mm/frame-vec: Drop gup_flags from get_vaddr_frames()

[Tomasz Figa <tfiga@chromium.org>]

On Fri, Oct 2, 2020 at 7:53 PM Daniel Vetter <daniel.vetter@ffwll.ch> wrote:
>
> FOLL_WRITE | FOLL_FORCE is really the only reasonable thing to do for
> simple dma device that can't guarantee write protection. Which is also
> what all the callers are using.
>
> So just simplify this.
>
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> Cc: Inki Dae <inki.dae@samsung.com>
> Cc: Joonyoung Shim <jy0922.shim@samsung.com>
> Cc: Seung-Woo Kim <sw0312.kim@samsung.com>
> Cc: Kyungmin Park <kyungmin.park@samsung.com>
> Cc: Kukjin Kim <kgene@kernel.org>
> Cc: Krzysztof Kozlowski <krzk@kernel.org>
> Cc: Pawel Osciak <pawel@osciak.com>
> Cc: Marek Szyprowski <m.szyprowski@samsung.com>
> Cc: Tomasz Figa <tfiga@chromium.org>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Oded Gabbay <oded.gabbay@gmail.com>
> Cc: Omer Shpigelman <oshpigelman@habana.ai>
> Cc: Tomer Tayar <ttayar@habana.ai>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Pawel Piskorski <ppiskorski@habana.ai>
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: linux-samsung-soc@vger.kernel.org
> Cc: linux-media@vger.kernel.org
> Cc: linux-mm@kvack.org
> ---
>  drivers/gpu/drm/exynos/exynos_drm_g2d.c           | 3 +--
>  drivers/media/common/videobuf2/videobuf2-memops.c | 3 +--
>  drivers/misc/habanalabs/common/memory.c           | 3 +--
>  include/linux/mm.h                                | 2 +-
>  mm/frame_vector.c                                 | 4 ++--
>  5 files changed, 6 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_g2d.c b/drivers/gpu/drm/exynos/exynos_drm_g2d.c
> index 967a5cdc120e..ac452842bab3 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_g2d.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_g2d.c
> @@ -480,8 +480,7 @@ static dma_addr_t *g2d_userptr_get_dma_addr(struct g2d_data *g2d,
>                 goto err_free;
>         }
>
> -       ret = get_vaddr_frames(start, npages, FOLL_FORCE | FOLL_WRITE,
> -               g2d_userptr->vec);
> +       ret = get_vaddr_frames(start, npages, g2d_userptr->vec);
>         if (ret != npages) {
>                 DRM_DEV_ERROR(g2d->dev,
>                               "failed to get user pages from userptr.\n");
> diff --git a/drivers/media/common/videobuf2/videobuf2-memops.c b/drivers/media/common/videobuf2/videobuf2-memops.c
> index 6e9e05153f4e..9dd6c27162f4 100644
> --- a/drivers/media/common/videobuf2/videobuf2-memops.c
> +++ b/drivers/media/common/videobuf2/videobuf2-memops.c
> @@ -40,7 +40,6 @@ struct frame_vector *vb2_create_framevec(unsigned long start,
>         unsigned long first, last;
>         unsigned long nr;
>         struct frame_vector *vec;
> -       unsigned int flags = FOLL_FORCE | FOLL_WRITE;
>
>         first = start >> PAGE_SHIFT;
>         last = (start + length - 1) >> PAGE_SHIFT;
> @@ -48,7 +47,7 @@ struct frame_vector *vb2_create_framevec(unsigned long start,
>         vec = frame_vector_create(nr);
>         if (!vec)
>                 return ERR_PTR(-ENOMEM);
> -       ret = get_vaddr_frames(start & PAGE_MASK, nr, flags, vec);
> +       ret = get_vaddr_frames(start & PAGE_MASK, nr, vec);
>         if (ret < 0)
>                 goto out_destroy;
>         /* We accept only complete set of PFNs */

For drivers/media/common/videobuf2/:

Acked-by: Tomasz Figa <tfiga@chromium.org>

Best regards,
Tomasz