linux-kernel - Re: [PATCH v2] gpu: drm: virtio: code cleanup

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Date:   Tue, 17 Jul 2018 17:04:05 +0530
From:   Souptick Joarder <jrdr.linux@...il.com>
To:     airlied@...ux.ie, Gerd Hoffmann <kraxel@...hat.com>
Cc:     dri-devel@...ts.freedesktop.org,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org,
        SUMAN TRIPATHI <svptas.linux@...il.com>,
        Ajit Linux <ajitn.linux@...il.com>, brajeswar.linux@...il.com,
        Sabyasachi Gupta <sabyasachi.linux@...il.com>
Subject: Re: [PATCH v2] gpu: drm: virtio: code cleanup

On Tue, Jul 3, 2018 at 9:03 PM, Souptick Joarder <jrdr.linux@...il.com> wrote:
> The fault handler code is commented since v4.2.
> If there is no plan to enable the fault handler
> code in future, we can remove this dead code.
>
> Signed-off-by: Souptick Joarder <jrdr.linux@...il.com>
> ---
> v2: corrected subject line
>

Any further comment on this patch ?

>  drivers/gpu/drm/virtio/virtgpu_ttm.c | 36 +-----------------------------------
>  1 file changed, 1 insertion(+), 35 deletions(-)
>
> diff --git a/drivers/gpu/drm/virtio/virtgpu_ttm.c b/drivers/gpu/drm/virtio/virtgpu_ttm.c
> index 11f8ae5..b6f021c 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_ttm.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_ttm.c
> @@ -106,29 +106,6 @@ static void virtio_gpu_ttm_global_fini(struct virtio_gpu_device *vgdev)
>         }
>  }
>
> -#if 0
> -/*
> - * Hmm, seems to not do anything useful.  Leftover debug hack?
> - * Something like printing pagefaults to kernel log?
> - */
> -static struct vm_operations_struct virtio_gpu_ttm_vm_ops;
> -static const struct vm_operations_struct *ttm_vm_ops;
> -
> -static int virtio_gpu_ttm_fault(struct vm_fault *vmf)
> -{
> -       struct ttm_buffer_object *bo;
> -       struct virtio_gpu_device *vgdev;
> -       int r;
> -
> -       bo = (struct ttm_buffer_object *)vmf->vma->vm_private_data;
> -       if (bo == NULL)
> -               return VM_FAULT_NOPAGE;
> -       vgdev = virtio_gpu_get_vgdev(bo->bdev);
> -       r = ttm_vm_ops->fault(vmf);
> -       return r;
> -}
> -#endif
> -
>  int virtio_gpu_mmap(struct file *filp, struct vm_area_struct *vma)
>  {
>         struct drm_file *file_priv;
> @@ -143,19 +120,8 @@ int virtio_gpu_mmap(struct file *filp, struct vm_area_struct *vma)
>                 return -EINVAL;
>         }
>         r = ttm_bo_mmap(filp, vma, &vgdev->mman.bdev);
> -#if 0
> -       if (unlikely(r != 0))
> -               return r;
> -       if (unlikely(ttm_vm_ops == NULL)) {
> -               ttm_vm_ops = vma->vm_ops;
> -               virtio_gpu_ttm_vm_ops = *ttm_vm_ops;
> -               virtio_gpu_ttm_vm_ops.fault = &virtio_gpu_ttm_fault;
> -       }
> -       vma->vm_ops = &virtio_gpu_ttm_vm_ops;
> -       return 0;
> -#else
> +
>         return r;
> -#endif
>  }
>
>  static int virtio_gpu_invalidate_caches(struct ttm_bo_device *bdev,
> --
> 1.9.1
>