linux-kernel - Re: [PATCH v2] drm/vkms: Use new return type vm_fault

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Message-ID: <20180730183454.GA5400@juma>
Date:   Mon, 30 Jul 2018 15:34:54 -0300
From:   Gustavo Padovan <gustavo@...ovan.org>
To:     Souptick Joarder <jrdr.linux@...il.com>
Cc:     willy@...radead.org, airlied@...ux.ie, daniel.vetter@...ll.ch,
        rodrigosiqueiramelo@...il.com, gustavo.padovan@...labora.com,
        hamohammed.sa@...il.com, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v2] drm/vkms: Use new return type vm_fault_t

Hi Souptick,

On Thu, Jul 26, 2018 at 08:15:49PM +0530, Souptick Joarder wrote:
> Use new return type vm_fault_t for fault handler.
> 
> Signed-off-by: Souptick Joarder <jrdr.linux@...il.com>
> ---
> v2: Updated patch title
> 
>  drivers/gpu/drm/vkms/vkms_drv.h | 2 +-
>  drivers/gpu/drm/vkms/vkms_gem.c | 5 ++---
>  2 files changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h
> index 07be29f..d5d04a8 100644
> --- a/drivers/gpu/drm/vkms/vkms_drv.h
> +++ b/drivers/gpu/drm/vkms/vkms_drv.h
> @@ -65,7 +65,7 @@ struct drm_gem_object *vkms_gem_create(struct drm_device *dev,
>  				       u32 *handle,
>  				       u64 size);
>  
> -int vkms_gem_fault(struct vm_fault *vmf);
> +vm_fault_t vkms_gem_fault(struct vm_fault *vmf);
>  
>  int vkms_dumb_create(struct drm_file *file, struct drm_device *dev,
>  		     struct drm_mode_create_dumb *args);
> diff --git a/drivers/gpu/drm/vkms/vkms_gem.c b/drivers/gpu/drm/vkms/vkms_gem.c
> index c7e3836..62e05dc 100644
> --- a/drivers/gpu/drm/vkms/vkms_gem.c
> +++ b/drivers/gpu/drm/vkms/vkms_gem.c
> @@ -43,14 +43,14 @@ void vkms_gem_free_object(struct drm_gem_object *obj)
>  	kfree(gem);
>  }
>  
> -int vkms_gem_fault(struct vm_fault *vmf)
> +vm_fault_t vkms_gem_fault(struct vm_fault *vmf)
>  {
>  	struct vm_area_struct *vma = vmf->vma;
>  	struct vkms_gem_object *obj = vma->vm_private_data;
>  	unsigned long vaddr = vmf->address;
>  	pgoff_t page_offset;
>  	loff_t num_pages;
> -	int ret;
> +	vm_fault_t ret = VM_FAULT_SIGBUS;
>  
>  	page_offset = (vaddr - vma->vm_start) >> PAGE_SHIFT;
>  	num_pages = DIV_ROUND_UP(obj->gem.size, PAGE_SIZE);
> @@ -58,7 +58,6 @@ int vkms_gem_fault(struct vm_fault *vmf)
>  	if (page_offset > num_pages)
>  		return VM_FAULT_SIGBUS;
>  
> -	ret = -ENOENT;
>  	mutex_lock(&obj->pages_lock);
>  	if (obj->pages) {
>  		get_page(obj->pages[page_offset]);
> -- 
> 1.9.1

Patch pushed to drm-misc-next. vkms is still experimental so I'm not
queueing this for 4.19. Thanks.

Gustavo