Re: [PATCH 1/5] dma-buf: remove fallback for !CONFIG_DMA_SHARED_BUFFER

[Daniel Vetter <daniel@ffwll.ch>]

On Fri, Sep 28, 2012 at 02:41:48PM +0200, Maarten Lankhorst wrote:
> Documentation says that code requiring dma-buf should add it to
> select, so inline fallbacks are not going to be used. A link error
> will make it obvious what went wrong, instead of silently doing
> nothing at runtime.
> 
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

I think it'd be good if we could merge this for 3.7 ...
-Daniel

> ---
>  include/linux/dma-buf.h |   99 -----------------------------------------------
>  1 file changed, 99 deletions(-)
> 
> diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h
> index eb48f38..bd2e52c 100644
> --- a/include/linux/dma-buf.h
> +++ b/include/linux/dma-buf.h
> @@ -156,7 +156,6 @@ static inline void get_dma_buf(struct dma_buf *dmabuf)
>  	get_file(dmabuf->file);
>  }
>  
> -#ifdef CONFIG_DMA_SHARED_BUFFER
>  struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf,
>  							struct device *dev);
>  void dma_buf_detach(struct dma_buf *dmabuf,
> @@ -184,103 +183,5 @@ int dma_buf_mmap(struct dma_buf *, struct vm_area_struct *,
>  		 unsigned long);
>  void *dma_buf_vmap(struct dma_buf *);
>  void dma_buf_vunmap(struct dma_buf *, void *vaddr);
> -#else
> -
> -static inline struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf,
> -							struct device *dev)
> -{
> -	return ERR_PTR(-ENODEV);
> -}
> -
> -static inline void dma_buf_detach(struct dma_buf *dmabuf,
> -				  struct dma_buf_attachment *dmabuf_attach)
> -{
> -	return;
> -}
> -
> -static inline struct dma_buf *dma_buf_export(void *priv,
> -					     const struct dma_buf_ops *ops,
> -					     size_t size, int flags)
> -{
> -	return ERR_PTR(-ENODEV);
> -}
> -
> -static inline int dma_buf_fd(struct dma_buf *dmabuf, int flags)
> -{
> -	return -ENODEV;
> -}
> -
> -static inline struct dma_buf *dma_buf_get(int fd)
> -{
> -	return ERR_PTR(-ENODEV);
> -}
> -
> -static inline void dma_buf_put(struct dma_buf *dmabuf)
> -{
> -	return;
> -}
> -
> -static inline struct sg_table *dma_buf_map_attachment(
> -	struct dma_buf_attachment *attach, enum dma_data_direction write)
> -{
> -	return ERR_PTR(-ENODEV);
> -}
> -
> -static inline void dma_buf_unmap_attachment(struct dma_buf_attachment *attach,
> -			struct sg_table *sg, enum dma_data_direction dir)
> -{
> -	return;
> -}
> -
> -static inline int dma_buf_begin_cpu_access(struct dma_buf *dmabuf,
> -					   size_t start, size_t len,
> -					   enum dma_data_direction dir)
> -{
> -	return -ENODEV;
> -}
> -
> -static inline void dma_buf_end_cpu_access(struct dma_buf *dmabuf,
> -					  size_t start, size_t len,
> -					  enum dma_data_direction dir)
> -{
> -}
> -
> -static inline void *dma_buf_kmap_atomic(struct dma_buf *dmabuf,
> -					unsigned long pnum)
> -{
> -	return NULL;
> -}
> -
> -static inline void dma_buf_kunmap_atomic(struct dma_buf *dmabuf,
> -					 unsigned long pnum, void *vaddr)
> -{
> -}
> -
> -static inline void *dma_buf_kmap(struct dma_buf *dmabuf, unsigned long pnum)
> -{
> -	return NULL;
> -}
> -
> -static inline void dma_buf_kunmap(struct dma_buf *dmabuf,
> -				  unsigned long pnum, void *vaddr)
> -{
> -}
> -
> -static inline int dma_buf_mmap(struct dma_buf *dmabuf,
> -			       struct vm_area_struct *vma,
> -			       unsigned long pgoff)
> -{
> -	return -ENODEV;
> -}
> -
> -static inline void *dma_buf_vmap(struct dma_buf *dmabuf)
> -{
> -	return NULL;
> -}
> -
> -static inline void dma_buf_vunmap(struct dma_buf *dmabuf, void *vaddr)
> -{
> -}
> -#endif /* CONFIG_DMA_SHARED_BUFFER */
>  
>  #endif /* __DMA_BUF_H__ */
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch