linux-kernel - Re: [PATCH 5/9] drm/xen/xen_drm_front_gem.c: Convert to use vm_insert

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Date:   Fri, 11 Jan 2019 17:10:01 +0200
From:   Oleksandr Andrushchenko <andr2000@...il.com>
To:     Souptick Joarder <jrdr.linux@...il.com>, akpm@...ux-foundation.org,
        willy@...radead.org, mhocko@...e.com, airlied@...ux.ie,
        linux@...linux.org.uk, robin.murphy@....com
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        dri-devel@...ts.freedesktop.org, xen-devel@...ts.xen.org,
        "Oleksandr_Andrushchenko@...m.com" <Oleksandr_Andrushchenko@...m.com>
Subject: Re: [PATCH 5/9] drm/xen/xen_drm_front_gem.c: Convert to use
 vm_insert_range

On 1/11/19 5:10 PM, Souptick Joarder wrote:
> Convert to use vm_insert_range() to map range of kernel
> memory to user vma.
>
> Signed-off-by: Souptick Joarder <jrdr.linux@...il.com>
Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@...m.com>
> ---
>   drivers/gpu/drm/xen/xen_drm_front_gem.c | 18 +++++-------------
>   1 file changed, 5 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/gpu/drm/xen/xen_drm_front_gem.c b/drivers/gpu/drm/xen/xen_drm_front_gem.c
> index 47ff019..9990c2f 100644
> --- a/drivers/gpu/drm/xen/xen_drm_front_gem.c
> +++ b/drivers/gpu/drm/xen/xen_drm_front_gem.c
> @@ -225,8 +225,7 @@ struct drm_gem_object *
>   static int gem_mmap_obj(struct xen_gem_object *xen_obj,
>   			struct vm_area_struct *vma)
>   {
> -	unsigned long addr = vma->vm_start;
> -	int i;
> +	int ret;
>   
>   	/*
>   	 * clear the VM_PFNMAP flag that was set by drm_gem_mmap(), and set the
> @@ -247,18 +246,11 @@ static int gem_mmap_obj(struct xen_gem_object *xen_obj,
>   	 * FIXME: as we insert all the pages now then no .fault handler must
>   	 * be called, so don't provide one
>   	 */
> -	for (i = 0; i < xen_obj->num_pages; i++) {
> -		int ret;
> -
> -		ret = vm_insert_page(vma, addr, xen_obj->pages[i]);
> -		if (ret < 0) {
> -			DRM_ERROR("Failed to insert pages into vma: %d\n", ret);
> -			return ret;
> -		}
> +	ret = vm_insert_range(vma, xen_obj->pages, xen_obj->num_pages);
> +	if (ret < 0)
> +		DRM_ERROR("Failed to insert pages into vma: %d\n", ret);
>   
> -		addr += PAGE_SIZE;
> -	}
> -	return 0;
> +	return ret;
>   }
>   
>   int xen_drm_front_gem_mmap(struct file *filp, struct vm_area_struct *vma)