diff mbox

[1/4] dma-buf: remove fallback for !CONFIG_DMA_SHARED_BUFFER

Message ID 20120810145728.5490.44707.stgit@patser.local (mailing list archive)
State New, archived
Headers show

Commit Message

Maarten Lankhorst Aug. 10, 2012, 2:57 p.m. UTC 
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>
---
 include/linux/dma-buf.h |   99 -----------------------------------------------
 1 file changed, 99 deletions(-)


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Comments

Daniel Vetter Aug. 10, 2012, 7:32 p.m. UTC | #1 
On Fri, Aug 10, 2012 at 04:57:43PM +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>

I've botched it more than once to update these when creating new dma-buf
code. Hence

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Rob Clark Aug. 11, 2012, 3:17 p.m. UTC | #2 
On Fri, Aug 10, 2012 at 2:32 PM, Daniel Vetter <daniel@ffwll.ch> wrote:
> On Fri, Aug 10, 2012 at 04:57:43PM +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>
>
> I've botched it more than once to update these when creating new dma-buf
> code. Hence
>
> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

yeah, I think the fallbacks date back to when it was a user
configurable option, rather than something select'd by drivers using
dmabuf, and we just never went back to clean up.  Let's drop the
fallbacks.

Reviewed-by: Rob Clark <rob.clark@linaro.org>


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diff mbox

Patch

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__ */